A simple preview component that shows thumbnails of image files. More...

#include <juce_ImagePreviewComponent.h>

Inheritance diagram for juce::ImagePreviewComponent:

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Collaboration diagram for juce::ImagePreviewComponent:

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Public Types
enum	FocusChangeType { focusChangedByMouseClick, focusChangedByTabKey, focusChangedDirectly }
	Enumeration used by the focusChanged() and focusLost() methods. More...

Public Member Functions
	ImagePreviewComponent ()
	Creates an ImagePreviewComponent. More...

	~ImagePreviewComponent () override
	Destructor. More...

void	addAndMakeVisible (Component *child, int zOrder=-1)
	Adds a child component to this one, and also makes the child visible if it isn't already. More...

void	addAndMakeVisible (Component &child, int zOrder=-1)
	Adds a child component to this one, and also makes the child visible if it isn't already. More...

void	addChildAndSetID (Component *child, const String &componentID)
	Adds a child component to this one, makes it visible, and sets its component ID. More...

void	addChildComponent (Component *child, int zOrder=-1)
	Adds a child component to this one. More...

void	addChildComponent (Component &child, int zOrder=-1)
	Adds a child component to this one. More...

void	addComponentListener (ComponentListener *newListener)
	Adds a listener to be told about changes to the component hierarchy or position. More...

void	addKeyListener (KeyListener *newListener)
	Adds a listener that wants to hear about keypresses that this component receives. More...

void	addMouseListener (MouseListener *newListener, bool wantsEventsForAllNestedChildComponents)
	Registers a listener to be told when mouse events occur in this component. More...

virtual void	addToDesktop (int windowStyleFlags, void *nativeWindowToAttachTo=nullptr)
	Makes this component appear as a window on the desktop. More...

virtual void	alphaChanged ()
	Called when setAlpha() is used to change the alpha value of this component. More...

virtual void	broughtToFront ()
	Called when this component has been moved to the front of its siblings. More...

virtual bool	canModalEventBeSentToComponent (const Component *targetComponent)
	When a component is modal, this callback allows it to choose which other components can still receive events. More...

void	centreWithSize (int width, int height)
	Changes the component's size and centres it within its parent. More...

virtual void	childBoundsChanged (Component *child)
	Called when one of this component's children is moved or resized. More...

virtual void	childrenChanged ()
	Subclasses can use this callback to be told when children are added or removed, or when their z-order changes. More...

virtual void	colourChanged ()
	This method is called when a colour is changed by the setColour() method. More...

bool	contains (Point< int > localPoint)
	Returns true if a given point lies within this component or one of its children. More...

void	copyAllExplicitColoursTo (Component &target) const
	This looks for any colours that have been specified for this component, and copies them to the specified target component. More...

Image	createComponentSnapshot (Rectangle< int > areaToGrab, bool clipImageToComponentBounds=true, float scaleFactor=1.0f)
	Generates a snapshot of part of this component. More...

virtual KeyboardFocusTraverser *	createFocusTraverser ()
	Creates a KeyboardFocusTraverser object to use to determine the logic by which focus should be passed from this component. More...

void	deleteAllChildren ()
	Removes and deletes all of this component's children. More...

virtual void	enablementChanged ()
	Callback to indicate that this component has been enabled or disabled. More...

void	enterModalState (bool takeKeyboardFocus=true, ModalComponentManager::Callback *callback=nullptr, bool deleteWhenDismissed=false)
	Puts the component into a modal state. More...

void	exitModalState (int returnValue)
	Ends a component's modal state. More...

Component *	findChildWithID (StringRef componentID) const noexcept
	Looks for a child component with the specified ID. More...

Colour	findColour (int colourID, bool inheritFromParent=false) const
	Looks for a colour that has been registered with the given colour ID number. More...

template<class TargetClass >
TargetClass *	findParentComponentOfClass () const
	Searches the parent components for a component of a specified class. More...

virtual void	focusGained (FocusChangeType cause)
	Called to indicate that this component has just acquired the keyboard focus. More...

virtual void	focusLost (FocusChangeType cause)
	Called to indicate that this component has just lost the keyboard focus. More...

virtual void	focusOfChildComponentChanged (FocusChangeType cause)
	Called to indicate a change in whether or not this component is the parent of the currently-focused component. More...

float	getAlpha () const noexcept
	Returns the component's current transparancy level. More...

int	getBottom () const noexcept
	Returns the y coordinate of the bottom edge of this component. More...

Rectangle< int >	getBounds () const noexcept
	Returns this component's bounding box. More...

Rectangle< int >	getBoundsInParent () const noexcept
	Returns the area of this component's parent which this component covers. More...

CachedComponentImage *	getCachedComponentImage () const noexcept
	Returns the object that was set by setCachedComponentImage(). More...

Component *	getChildComponent (int index) const noexcept
	Returns one of this component's child components, by it index. More...

const Array< Component * > &	getChildren () const noexcept
	Provides access to the underlying array of child components. More...

Component *	getComponentAt (int x, int y)
	Returns the component at a certain point within this one. More...

Component *	getComponentAt (Point< int > position)
	Returns the component at a certain point within this one. More...

ImageEffectFilter *	getComponentEffect () const noexcept
	Returns the current component effect. More...

const String &	getComponentID () const noexcept
	Returns the ID string that was set by setComponentID(). More...

virtual float	getDesktopScaleFactor () const
	Returns the default scale factor to use for this component when it is placed on the desktop. More...

int	getExplicitFocusOrder () const
	Returns the focus order of this component, if one has been specified. More...

int	getHeight () const noexcept
	Returns the component's height in pixels. More...

int	getIndexOfChildComponent (const Component *child) const noexcept
	Returns the index of this component in the list of child components. More...

void	getInterceptsMouseClicks (bool &allowsClicksOnThisComponent, bool &allowsClicksOnChildComponents) const noexcept
	Retrieves the current state of the mouse-click interception flags. More...

Rectangle< int >	getLocalArea (const Component *sourceComponent, Rectangle< int > areaRelativeToSourceComponent) const
	Converts a rectangle to be relative to this component's coordinate space. More...

Rectangle< int >	getLocalBounds () const noexcept
	Returns the component's bounds, relative to its own origin. More...

Point< int >	getLocalPoint (const Component *sourceComponent, Point< int > pointRelativeToSourceComponent) const
	Converts a point to be relative to this component's coordinate space. More...

Point< float >	getLocalPoint (const Component *sourceComponent, Point< float > pointRelativeToSourceComponent) const
	Converts a point to be relative to this component's coordinate space. More...

LookAndFeel &	getLookAndFeel () const noexcept
	Finds the appropriate look-and-feel to use for this component. More...

bool	getMouseClickGrabsKeyboardFocus () const noexcept
	Returns the last value set with setMouseClickGrabsKeyboardFocus(). More...

virtual MouseCursor	getMouseCursor ()
	Returns the mouse cursor shape to use when the mouse is over this component. More...

Point< int >	getMouseXYRelative () const
	Returns the mouse's current position, relative to this component. More...

const String &	getName () const noexcept
	Returns the name of this component. More...

int	getNumChildComponents () const noexcept
	Returns the number of child components that this component contains. More...

Component *	getParentComponent () const noexcept
	Returns the component which this component is inside. More...

int	getParentHeight () const noexcept
	Returns the height of the component's parent. More...

Rectangle< int >	getParentMonitorArea () const
	Returns the screen coordinates of the monitor that contains this component. More...

int	getParentWidth () const noexcept
	Returns the width of the component's parent. More...

ComponentPeer *	getPeer () const
	Returns the heavyweight window that contains this component. More...

Point< int >	getPosition () const noexcept
	Returns the component's top-left position as a Point. More...

Positioner *	getPositioner () const noexcept
	Returns the Positioner object that has been set for this component. More...

NamedValueSet &	getProperties () noexcept
	Returns the set of properties that belong to this component. More...

const NamedValueSet &	getProperties () const noexcept
	Returns the set of properties that belong to this component. More...

int	getRight () const noexcept
	Returns the x coordinate of the component's right-hand edge. More...

Rectangle< int >	getScreenBounds () const
	Returns the bounds of this component, relative to the screen's top-left. More...

Point< int >	getScreenPosition () const
	Returns the position of this component's top-left corner relative to the screen's top-left. More...

int	getScreenX () const
	Returns this component's x coordinate relative the screen's top-left origin. More...

int	getScreenY () const
	Returns this component's y coordinate relative the screen's top-left origin. More...

Component *	getTopLevelComponent () const noexcept
	Returns the highest-level component which contains this one or its parents. More...

AffineTransform	getTransform () const
	Returns the transform that is currently being applied to this component. More...

bool	getViewportIgnoreDragFlag () const noexcept
	Retrieves the current state of the Viewport drag-to-scroll functionality flag. More...

bool	getWantsKeyboardFocus () const noexcept
	Returns true if the component is interested in getting keyboard focus. More...

int	getWidth () const noexcept
	Returns the component's width in pixels. More...

void *	getWindowHandle () const
	Returns the underlying native window handle for this component. More...

int	getX () const noexcept
	Returns the x coordinate of the component's left edge. More...

int	getY () const noexcept
	Returns the y coordinate of the top of this component. More...

void	grabKeyboardFocus ()
	Tries to give keyboard focus to this component. More...

virtual void	handleCommandMessage (int commandId)
	Called to handle a command that was sent by postCommandMessage(). More...

bool	hasKeyboardFocus (bool trueIfChildIsFocused) const
	Returns true if this component currently has the keyboard focus. More...

virtual bool	hitTest (int x, int y)
	Tests whether a given point is inside the component. More...

virtual void	inputAttemptWhenModal ()
	Called when the user tries to click on a component that is blocked by another modal component. More...

bool	isAlwaysOnTop () const noexcept
	Returns true if this component is set to always stay in front of its siblings. More...

bool	isBroughtToFrontOnMouseClick () const noexcept
	Indicates whether the component should be brought to the front when clicked-on. More...

bool	isColourSpecified (int colourID) const
	Returns true if the specified colour ID has been explicitly set for this component using the setColour() method. More...

bool	isCurrentlyBlockedByAnotherModalComponent () const
	Checks whether there's a modal component somewhere that's stopping this one from receiving messages. More...

bool	isCurrentlyModal (bool onlyConsiderForemostModalComponent=true) const noexcept
	Returns true if this component is the modal one. More...

bool	isEnabled () const noexcept
	Returns true if the component (and all its parents) are enabled. More...

bool	isFocusContainer () const noexcept
	Returns true if this component has been marked as a focus container. More...

bool	isMouseButtonDown (bool includeChildren=false) const
	Returns true if the mouse button is currently held down in this component. More...

bool	isMouseOver (bool includeChildren=false) const
	Returns true if the mouse is currently over this component. More...

bool	isMouseOverOrDragging (bool includeChildren=false) const
	True if the mouse is over this component, or if it's being dragged in this component. More...

bool	isOnDesktop () const noexcept
	Returns true if this component is currently showing on the desktop. More...

bool	isOpaque () const noexcept
	Returns true if no parts of this component are transparent. More...

bool	isPaintingUnclipped () const noexcept
	Returns true if this component doesn't require its graphics context to be clipped when it is being painted. More...

bool	isParentOf (const Component *possibleChild) const noexcept
	Checks whether a component is anywhere inside this component or its children. More...

bool	isShowing () const
	Tests whether this component and all its parents are visible. More...

bool	isTransformed () const noexcept
	Returns true if a non-identity transform is being applied to this component. More...

bool	isVisible () const noexcept
	Tests whether the component is visible or not. More...

virtual bool	keyPressed (const KeyPress &key)
	Called when a key is pressed. More...

virtual bool	keyStateChanged (bool isKeyDown)
	Called when a key is pressed or released. More...

Rectangle< int >	localAreaToGlobal (Rectangle< int > localArea) const
	Converts a rectangle from this component's coordinate space to a screen coordinate. More...

Point< int >	localPointToGlobal (Point< int > localPoint) const
	Converts a point relative to this component's top-left into a screen coordinate. More...

Point< float >	localPointToGlobal (Point< float > localPoint) const
	Converts a point relative to this component's top-left into a screen coordinate. More...

virtual void	lookAndFeelChanged ()
	Called to let the component react to a change in the look-and-feel setting. More...

virtual void	minimisationStateChanged (bool isNowMinimised)
	Called for a desktop component which has just been minimised or un-minimised. More...

virtual void	modifierKeysChanged (const ModifierKeys &modifiers)
	Called when a modifier key is pressed or released. More...

void	mouseDoubleClick (const MouseEvent &event) override
	Called when a mouse button has been double-clicked on a component. More...

void	mouseDown (const MouseEvent &event) override
	Called when a mouse button is pressed. More...

void	mouseDrag (const MouseEvent &event) override
	Called when the mouse is moved while a button is held down. More...

void	mouseEnter (const MouseEvent &event) override
	Called when the mouse first enters a component. More...

void	mouseExit (const MouseEvent &event) override
	Called when the mouse moves out of a component. More...

void	mouseMagnify (const MouseEvent &event, float scaleFactor) override
	Called when a pinch-to-zoom mouse-gesture is used. More...

void	mouseMove (const MouseEvent &event) override
	Called when the mouse moves inside a component. More...

void	mouseUp (const MouseEvent &event) override
	Called when a mouse button is released. More...

void	mouseWheelMove (const MouseEvent &event, const MouseWheelDetails &wheel) override
	Called when the mouse-wheel is moved. More...

virtual void	moved ()
	Called when this component's position has been changed. More...

void	moveKeyboardFocusToSibling (bool moveToNext)
	Tries to move the keyboard focus to one of this component's siblings. More...

void	paint (Graphics &) override

void	paintEntireComponent (Graphics &context, bool ignoreAlphaLevel)
	Draws this component and all its subcomponents onto the specified graphics context. More...

virtual void	paintOverChildren (Graphics &g)
	Components can override this method to draw over the top of their children. More...

virtual void	parentHierarchyChanged ()
	Called to indicate that the component's parents have changed. More...

virtual void	parentSizeChanged ()
	Called when this component's immediate parent has been resized. More...

void	postCommandMessage (int commandId)
	Dispatches a numbered message to this component. More...

int	proportionOfHeight (float proportion) const noexcept
	Returns a proportion of the component's height. More...

int	proportionOfWidth (float proportion) const noexcept
	Returns a proportion of the component's width. More...

bool	reallyContains (Point< int > localPoint, bool returnTrueIfWithinAChild)
	Returns true if a given point lies in this component, taking any overlapping siblings into account. More...

void	removeAllChildren ()
	Removes all this component's children. More...

void	removeChildComponent (Component *childToRemove)
	Removes one of this component's child-components. More...

Component *	removeChildComponent (int childIndexToRemove)
	Removes one of this component's child-components by index. More...

void	removeColour (int colourID)
	If a colour has been set with setColour(), this will remove it. More...

void	removeComponentListener (ComponentListener *listenerToRemove)
	Removes a component listener. More...

void	removeFromDesktop ()
	If the component is currently showing on the desktop, this will hide it. More...

void	removeKeyListener (KeyListener *listenerToRemove)
	Removes a previously-registered key listener. More...

void	removeMouseListener (MouseListener *listenerToRemove)
	Deregisters a mouse listener. More...

void	repaint ()
	Marks the whole component as needing to be redrawn. More...

void	repaint (int x, int y, int width, int height)
	Marks a subsection of this component as needing to be redrawn. More...

void	repaint (Rectangle< int > area)
	Marks a subsection of this component as needing to be redrawn. More...

virtual void	resized ()
	Called when this component's size has been changed. More...

int	runModalLoop ()
	Runs a component modally, waiting until the loop terminates. More...

void	selectedFileChanged (const File &newSelectedFile) override

void	sendLookAndFeelChange ()
	Calls the lookAndFeelChanged() method in this component and all its children. More...

void	setAlpha (float newAlpha)
	Changes the transparency of this component. More...

void	setAlwaysOnTop (bool shouldStayOnTop)
	Sets whether the component should always be kept at the front of its siblings. More...

void	setBounds (int x, int y, int width, int height)
	Changes the component's position and size. More...

void	setBounds (Rectangle< int > newBounds)
	Changes the component's position and size. More...

void	setBoundsInset (BorderSize< int > borders)
	Changes the component's position and size based on the amount of space to leave around it. More...

void	setBoundsRelative (float proportionalX, float proportionalY, float proportionalWidth, float proportionalHeight)
	Changes the component's position and size in terms of fractions of its parent's size. More...

void	setBoundsRelative (Rectangle< float > proportionalArea)
	Changes the component's position and size in terms of fractions of its parent's size. More...

void	setBoundsToFit (Rectangle< int > targetArea, Justification justification, bool onlyReduceInSize)
	Positions the component within a given rectangle, keeping its proportions unchanged. More...

void	setBroughtToFrontOnMouseClick (bool shouldBeBroughtToFront) noexcept
	Indicates whether the component should be brought to the front when clicked. More...

void	setBufferedToImage (bool shouldBeBuffered)
	Makes the component use an internal buffer to optimise its redrawing. More...

void	setCachedComponentImage (CachedComponentImage *newCachedImage)
	Gives the component a CachedComponentImage that should be used to buffer its painting. More...

void	setCentrePosition (int x, int y)
	Changes the position of the component's centre. More...

void	setCentrePosition (Point< int > newCentrePosition)
	Changes the position of the component's centre. More...

void	setCentreRelative (float x, float y)
	Changes the position of the component's centre. More...

void	setColour (int colourID, Colour newColour)
	Registers a colour to be used for a particular purpose. More...

void	setComponentEffect (ImageEffectFilter *newEffect)
	Adds an effect filter to alter the component's appearance. More...

void	setComponentID (const String &newID)
	Sets the component's ID string. More...

void	setEnabled (bool shouldBeEnabled)
	Enables or disables this component. More...

void	setExplicitFocusOrder (int newFocusOrderIndex)
	Sets the index used in determining the order in which focusable components should be traversed. More...

void	setFocusContainer (bool shouldBeFocusContainer) noexcept
	Indicates whether this component is a parent for components that can have their focus traversed. More...

void	setInterceptsMouseClicks (bool allowClicksOnThisComponent, bool allowClicksOnChildComponents) noexcept
	Changes the default return value for the hitTest() method. More...

void	setLookAndFeel (LookAndFeel *newLookAndFeel)
	Sets the look and feel to use for this component. More...

void	setMouseClickGrabsKeyboardFocus (bool shouldGrabFocus)
	Chooses whether a click on this component automatically grabs the focus. More...

void	setMouseCursor (const MouseCursor &cursorType)
	Changes the mouse cursor shape to use when the mouse is over this component. More...

virtual void	setName (const String &newName)
	Sets the name of this component. More...

void	setOpaque (bool shouldBeOpaque)
	Indicates whether any parts of the component might be transparent. More...

void	setPaintingIsUnclipped (bool shouldPaintWithoutClipping) noexcept
	This allows you to indicate that this component doesn't require its graphics context to be clipped when it is being painted. More...

void	setPositioner (Positioner *newPositioner)
	Sets a new Positioner object for this component. More...

void	setRepaintsOnMouseActivity (bool shouldRepaint) noexcept
	Causes automatic repaints when the mouse enters or exits this component. More...

void	setSize (int newWidth, int newHeight)
	Changes the size of the component. More...

void	setTopLeftPosition (int x, int y)
	Moves the component to a new position. More...

void	setTopLeftPosition (Point< int > newTopLeftPosition)
	Moves the component to a new position. More...

void	setTopRightPosition (int x, int y)
	Moves the component to a new position. More...

void	setTransform (const AffineTransform &transform)
	Sets a transform matrix to be applied to this component. More...

void	setViewportIgnoreDragFlag (bool ignoreDrag) noexcept
	Sets a flag to indicate whether mouse drag events on this Component should be ignored when it is inside a Viewport with drag-to-scroll functionality enabled. More...

virtual void	setVisible (bool shouldBeVisible)
	Makes the component visible or invisible. More...

void	setWantsKeyboardFocus (bool wantsFocus) noexcept
	Sets a flag to indicate whether this component needs keyboard focus or not. More...

void	timerCallback () override

void	toBack ()
	Changes this component's z-order to be at the back of all its siblings. More...

void	toBehind (Component *other)
	Changes this component's z-order so that it's just behind another component. More...

void	toFront (bool shouldAlsoGainFocus)
	Brings the component to the front of its siblings. More...

void	updateMouseCursor () const
	Forces the current mouse cursor to be updated. More...

virtual void	userTriedToCloseWindow ()
	For components on the desktop, this is called if the system wants to close the window. More...

virtual void	visibilityChanged ()
	Called when this component's visibility changes. More...

Static Public Member Functions
static void	beginDragAutoRepeat (int millisecondsBetweenCallbacks)
	Ensures that a non-stop stream of mouse-drag events will be sent during the current mouse-drag operation. More...

static Component *	getCurrentlyFocusedComponent () noexcept
	Returns the component that currently has the keyboard focus. More...

static Component *	getCurrentlyModalComponent (int index=0) noexcept
	Returns one of the components that are currently modal. More...

static int	getNumCurrentlyModalComponents () noexcept
	Returns the number of components that are currently in a modal state. More...

static bool	isMouseButtonDownAnywhere () noexcept
	Returns true if a mouse button is currently down. More...

static void	unfocusAllComponents ()
	If any component has keyboard focus, this will defocus it. More...

Private Member Functions
void	getThumbSize (int &w, int &h) const

int	getTimerInterval () const noexcept
	Returns the timer's interval. More...

bool	isTimerRunning () const noexcept
	Returns true if the timer is currently running. More...

void	startTimer (int intervalInMilliseconds) noexcept
	Starts the timer and sets the length of interval required. More...

void	startTimerHz (int timerFrequencyHz) noexcept
	Starts the timer with an interval specified in Hertz. More...

void	stopTimer () noexcept
	Stops the timer. More...

Static Private Member Functions
static void	callAfterDelay (int milliseconds, std::function< void()> functionToCall)
	Invokes a lambda after a given number of milliseconds. More...

static void	callPendingTimersSynchronously ()
	For internal use only: invokes any timers that need callbacks. More...

Private Attributes
String	currentDetails

Image	currentThumbnail

File	fileToLoad

Detailed Description

A simple preview component that shows thumbnails of image files.

See also: FileChooserDialogBox, FilePreviewComponent

{GUI}

Member Enumeration Documentation

◆ FocusChangeType

enum juce::Component::FocusChangeType

inherited

Enumeration used by the focusChanged() and focusLost() methods.

Enumerator
focusChangedByMouseClick	Means that the user clicked the mouse to change focus.
focusChangedByTabKey	Means that the user pressed the tab key to move the focus.
focusChangedDirectly	Means that the focus was changed by a call to grabKeyboardFocus().

Constructor & Destructor Documentation

◆ ImagePreviewComponent()

juce::ImagePreviewComponent::ImagePreviewComponent ( )

Creates an ImagePreviewComponent.

◆ ~ImagePreviewComponent()

juce::ImagePreviewComponent::~ImagePreviewComponent ( )

override

Destructor.

Member Function Documentation

◆ addAndMakeVisible() [1/2]

void juce::Component::addAndMakeVisible	(	Component *	child,
		int	zOrder = `-1`
	)

inherited

Adds a child component to this one, and also makes the child visible if it isn't already.

This is the same as calling setVisible (true) on the child and then addChildComponent(). See addChildComponent() for more details.

Parameters

child	the new component to add. If the component passed-in is already the child of another component, it'll first be removed from it current parent.
zOrder	The index in the child-list at which this component should be inserted. A value of -1 will insert it in front of the others, 0 is the back.

Referenced by juce::StandaloneFilterWindow::StandaloneFilterWindow().

◆ addAndMakeVisible() [2/2]

void juce::Component::addAndMakeVisible	(	Component &	child,
		int	zOrder = `-1`
	)

inherited

Adds a child component to this one, and also makes the child visible if it isn't already.

This is the same as calling setVisible (true) on the child and then addChildComponent(). See addChildComponent() for more details.

Parameters

child	the new component to add. If the component passed-in is already the child of another component, it'll first be removed from it current parent.
zOrder	The index in the child-list at which this component should be inserted. A value of -1 will insert it in front of the others, 0 is the back.

◆ addChildAndSetID()

void juce::Component::addChildAndSetID	(	Component *	child,
		const String &	componentID
	)

inherited

Adds a child component to this one, makes it visible, and sets its component ID.

See also: addAndMakeVisible, addChildComponent

◆ addChildComponent() [1/2]

void juce::Component::addChildComponent	(	Component *	child,
		int	zOrder = `-1`
	)

inherited

Adds a child component to this one.

Adding a child component does not mean that the component will own or delete the child - it's your responsibility to delete the component. Note that it's safe to delete a component without first removing it from its parent - doing so will automatically remove it and send out the appropriate notifications before the deletion completes.

If the child is already a child of this component, then no action will be taken, and its z-order will be left unchanged.

Parameters

child	the new component to add. If the component passed-in is already the child of another component, it'll first be removed from it current parent.
zOrder	The index in the child-list at which this component should be inserted. A value of -1 will insert it in front of the others, 0 is the back.

See also: removeChildComponent, addAndMakeVisible, addChildAndSetID, getChild, ComponentListener::componentChildrenChanged

◆ addChildComponent() [2/2]

void juce::Component::addChildComponent	(	Component &	child,
		int	zOrder = `-1`
	)

inherited

Adds a child component to this one.

Adding a child component does not mean that the component will own or delete the child - it's your responsibility to delete the component. Note that it's safe to delete a component without first removing it from its parent - doing so will automatically remove it and send out the appropriate notifications before the deletion completes.

If the child is already a child of this component, then no action will be taken, and its z-order will be left unchanged.

Parameters

child	the new component to add. If the component passed-in is already the child of another component, it'll first be removed from it current parent.
zOrder	The index in the child-list at which this component should be inserted. A value of -1 will insert it in front of the others, 0 is the back.

See also: removeChildComponent, addAndMakeVisible, addChildAndSetID, getChild, ComponentListener::componentChildrenChanged

◆ addComponentListener()

void juce::Component::addComponentListener ( ComponentListener * newListener )

inherited

Adds a listener to be told about changes to the component hierarchy or position.

Component listeners get called when this component's size, position or children change - see the ComponentListener class for more details.

Parameters

newListener the listener to register - if this is already registered, it will be ignored.

See also: ComponentListener, removeComponentListener

◆ addKeyListener()

void juce::Component::addKeyListener ( KeyListener * newListener )

inherited

Adds a listener that wants to hear about keypresses that this component receives.

The listeners that are registered with a component are called by its keyPressed() or keyStateChanged() methods (assuming these haven't been overridden to do something else).

If you add an object as a key listener, be careful to remove it when the object is deleted, or the component will be left with a dangling pointer.

See also: keyPressed, keyStateChanged, removeKeyListener

◆ addMouseListener()

void juce::Component::addMouseListener	(	MouseListener *	newListener,
		bool	wantsEventsForAllNestedChildComponents
	)

inherited

Registers a listener to be told when mouse events occur in this component.

If you need to get informed about mouse events in a component but can't or don't want to override its methods, you can attach any number of listeners to the component, and these will get told about the events in addition to the component's own callbacks being called.

Note that a MouseListener can also be attached to more than one component.

Parameters

newListener	the listener to register
wantsEventsForAllNestedChildComponents	if true, the listener will receive callbacks for events that happen to any child component within this component, including deeply-nested child components. If false, it will only be told about events that this component handles.

See also: MouseListener, removeMouseListener

◆ addToDesktop()

virtual void juce::Component::addToDesktop	(	int	windowStyleFlags,
		void *	nativeWindowToAttachTo = `nullptr`
	)

virtualinherited

Makes this component appear as a window on the desktop.

Note that before calling this, you should make sure that the component's opacity is set correctly using setOpaque(). If the component is non-opaque, the windowing system will try to create a special transparent window for it, which will generally take a lot more CPU to operate (and might not even be possible on some platforms).

If the component is inside a parent component at the time this method is called, it will first be removed from that parent. Likewise if a component is on the desktop and is subsequently added to another component, it'll be removed from the desktop.

Parameters

windowStyleFlags	a combination of the flags specified in the ComponentPeer::StyleFlags enum, which define the window's characteristics.
nativeWindowToAttachTo	this allows an OS object to be passed-in as the window in which the juce component should place itself. On Windows, this would be a HWND, a HIViewRef on the Mac. Not necessarily supported on all platforms, and best left as 0 unless you know what you're doing.

See also: removeFromDesktop, isOnDesktop, userTriedToCloseWindow, getPeer, ComponentPeer::setMinimised, ComponentPeer::StyleFlags, ComponentPeer::getStyleFlags, ComponentPeer::setFullScreen

Reimplemented in juce::TopLevelWindow.

◆ alphaChanged()

virtual void juce::Component::alphaChanged ( )

virtualinherited

Called when setAlpha() is used to change the alpha value of this component.

If you override this, you should also invoke the base class's implementation during your overridden function, as it performs some repainting behaviour.

Reimplemented in juce::NSViewComponent.

◆ beginDragAutoRepeat()

static void juce::Component::beginDragAutoRepeat ( int millisecondsBetweenCallbacks )

staticinherited

Ensures that a non-stop stream of mouse-drag events will be sent during the current mouse-drag operation.

This allows you to make sure that mouseDrag() events are sent continuously, even when the mouse isn't moving. This can be useful for things like auto-scrolling components when the mouse is near an edge.

Call this method during a mouseDown() or mouseDrag() callback, specifying the minimum interval between consecutive mouse drag callbacks. The callbacks will continue until the mouse is released, and then the interval will be reset, so you need to make sure it's called every time you begin a drag event. Passing an interval of 0 or less will cancel the auto-repeat.

See also: mouseDrag, Desktop::beginDragAutoRepeat

◆ broughtToFront()

virtual void juce::Component::broughtToFront ( )

virtualinherited

Called when this component has been moved to the front of its siblings.

The component may have been brought to the front by the toFront() method, or by the operating system if it's a top-level window.

See also: toFront

Reimplemented in juce::XEmbedComponent, and juce::MultiDocumentPanelWindow.

◆ callAfterDelay()

static void juce::Timer::callAfterDelay	(	int	milliseconds,
		std::function< void()>	functionToCall
	)

staticinherited

Invokes a lambda after a given number of milliseconds.

◆ callPendingTimersSynchronously()

static void juce::Timer::callPendingTimersSynchronously ( )

staticinherited

For internal use only: invokes any timers that need callbacks.

Don't call this unless you really know what you're doing!

◆ canModalEventBeSentToComponent()

virtual bool juce::Component::canModalEventBeSentToComponent ( const Component * targetComponent )

virtualinherited

When a component is modal, this callback allows it to choose which other components can still receive events.

When a modal component is active and the user clicks on a non-modal component, this method is called on the modal component, and if it returns true, the event is allowed to reach its target. If it returns false, the event is blocked and the inputAttemptWhenModal() callback is made.

It called by the isCurrentlyBlockedByAnotherModalComponent() method. The default implementation just returns false in all cases.

◆ centreWithSize()

void juce::Component::centreWithSize	(	int	width,
		int	height
	)

inherited

Changes the component's size and centres it within its parent.

After changing the size, the component will be moved so that it's centred within its parent. If the component is on the desktop (or has no parent component), then it'll be centred within the main monitor area.

◆ childBoundsChanged()

virtual void juce::Component::childBoundsChanged ( Component * child )

virtualinherited

Called when one of this component's children is moved or resized.

If the parent wants to know about changes to its immediate children (not to children of its children), this is the method to override.

See also: moved, resized, parentSizeChanged

Reimplemented in juce::ResizableWindow, juce::CallOutBox, juce::TabBarButton, and juce::DrawableComposite.

◆ childrenChanged()

virtual void juce::Component::childrenChanged ( )

virtualinherited

Subclasses can use this callback to be told when children are added or removed, or when their z-order changes.

See also: parentHierarchyChanged, ComponentListener::componentChildrenChanged

Reimplemented in juce::DrawableComposite.

◆ colourChanged()

virtual void juce::Component::colourChanged ( )

virtualinherited

This method is called when a colour is changed by the setColour() method.

See also: setColour, findColour

Reimplemented in juce::Slider, juce::TreeView, juce::ListBox, juce::ComboBox, juce::Label, juce::MidiKeyboardComponent, juce::DrawableButton, juce::ProgressBar, juce::TextPropertyComponent, juce::HyperlinkButton, juce::TextButton, juce::GroupComponent, and juce::ToggleButton.

◆ contains()

bool juce::Component::contains ( Point< int > localPoint )

inherited

Returns true if a given point lies within this component or one of its children.

Never override this method! Use hitTest to create custom hit regions.

Parameters

localPoint the coordinate to test, relative to this component's top-left.

Returns: true if the point is within the component's hit-test area, but only if that part of the component isn't clipped by its parent component. Note that this won't take into account any overlapping sibling components which might be in the way - for that, see reallyContains()

See also: hitTest, reallyContains, getComponentAt

◆ copyAllExplicitColoursTo()

void juce::Component::copyAllExplicitColoursTo ( Component & target ) const

inherited

This looks for any colours that have been specified for this component, and copies them to the specified target component.

◆ createComponentSnapshot()

Image juce::Component::createComponentSnapshot	(	Rectangle< int >	areaToGrab,
		bool	clipImageToComponentBounds = `true`,
		float	scaleFactor = `1.0f`
	)

inherited

Generates a snapshot of part of this component.

This will return a new Image, the size of the rectangle specified, containing a snapshot of the specified area of the component and all its children.

The image may or may not have an alpha-channel, depending on whether the image is opaque or not.

If the clipImageToComponentBounds parameter is true and the area is greater than the size of the component, it'll be clipped. If clipImageToComponentBounds is false then parts of the component beyond its bounds can be drawn.

See also: paintEntireComponent

◆ createFocusTraverser()

virtual KeyboardFocusTraverser* juce::Component::createFocusTraverser ( )

virtualinherited

Creates a KeyboardFocusTraverser object to use to determine the logic by which focus should be passed from this component.

The default implementation of this method will return a default KeyboardFocusTraverser if this component is a focus container (as determined by the setFocusContainer() method). If the component isn't a focus container, then it will recursively ask its parents for a KeyboardFocusTraverser.

If you override this to return a custom KeyboardFocusTraverser, then this component and all its sub-components will use the new object to make their focusing decisions.

The method should return a new object, which the caller is required to delete when no longer needed.

Reimplemented in juce::Label, and juce::FilenameComponent.

◆ deleteAllChildren()

void juce::Component::deleteAllChildren ( )

inherited

Removes and deletes all of this component's children.

My advice is to avoid this method! It's an old function that is only kept here for backwards-compatibility with legacy code, and should be viewed with extreme suspicion by anyone attempting to write modern C++. In almost all cases, it's much smarter to manage the lifetimes of your child components via modern RAII techniques such as simply making them member variables, or using std::unique_ptr, OwnedArray, etc to manage their lifetimes appropriately.

See also: removeAllChildren

◆ enablementChanged()

virtual void juce::Component::enablementChanged ( )

virtualinherited

Callback to indicate that this component has been enabled or disabled.

This can be triggered by one of the component's parent components being enabled or disabled, as well as changes to the component itself.

The default implementation of this method does nothing; your class may wish to repaint itself or something when this happens.

See also: setEnabled, isEnabled

Reimplemented in juce::Slider, juce::TreeView, juce::TextEditor, juce::Button, juce::ComboBox, juce::Label, juce::DrawableButton, juce::PropertyComponent, juce::GroupComponent, and juce::ToolbarButton.

◆ enterModalState()

void juce::Component::enterModalState	(	bool	takeKeyboardFocus = `true`,
		ModalComponentManager::Callback *	callback = `nullptr`,
		bool	deleteWhenDismissed = `false`
	)

inherited

Puts the component into a modal state.

This makes the component modal, so that messages are blocked from reaching any components other than this one and its children, but unlike runModalLoop(), this method returns immediately.

If takeKeyboardFocus is true, the component will use grabKeyboardFocus() to get the focus, which is usually what you'll want it to do. If not, it will leave the focus unchanged.

The callback is an optional object which will receive a callback when the modal component loses its modal status, either by being hidden or when exitModalState() is called. If you pass an object in here, the system will take care of deleting it later, after making the callback

If deleteWhenDismissed is true, then when it is dismissed, the component will be deleted and then the callback will be called. (This will safely handle the situation where the component is deleted before its exitModalState() method is called).

See also: exitModalState, runModalLoop, ModalComponentManager::attachCallback

◆ exitModalState()

void juce::Component::exitModalState ( int returnValue )

inherited

Ends a component's modal state.

If this component is currently modal, this will turn off its modalness, and return a value to the runModalLoop() method that might have be running its modal loop.

See also: runModalLoop, enterModalState, isCurrentlyModal

◆ findChildWithID()

Component* juce::Component::findChildWithID ( StringRef componentID ) const

noexceptinherited

Looks for a child component with the specified ID.

See also: setComponentID, getComponentID

◆ findColour()

Colour juce::Component::findColour	(	int	colourID,
		bool	inheritFromParent = `false`
	)		const

inherited

Looks for a colour that has been registered with the given colour ID number.

If a colour has been set for this ID number using setColour(), then it is returned. If none has been set, the method will try calling the component's LookAndFeel class's findColour() method. If none has been registered with the look-and-feel either, it will just return black.

The colour IDs for various purposes are stored as enums in the components that they are relevant to - for an example, see Slider::ColourIds, Label::ColourIds, TextEditor::ColourIds, TreeView::ColourIds, etc.

See also: setColour, isColourSpecified, colourChanged, LookAndFeel::findColour, LookAndFeel::setColour

◆ findParentComponentOfClass()

template<class TargetClass >

TargetClass* juce::Component::findParentComponentOfClass ( ) const

inlineinherited

Searches the parent components for a component of a specified class.

For example findParentComponentOfClass <MyComp>() would return the first parent component that can be dynamically cast to a MyComp, or will return nullptr if none of the parents are suitable.

◆ focusGained()

virtual void juce::Component::focusGained ( FocusChangeType cause )

virtualinherited

Called to indicate that this component has just acquired the keyboard focus.

See also: focusLost, setWantsKeyboardFocus, getCurrentlyFocusedComponent, hasKeyboardFocus

Reimplemented in juce::TextEditor, juce::Button, juce::ComboBox, juce::CodeEditorComponent, juce::Label, juce::WebBrowserComponent, and juce::XEmbedComponent.

◆ focusLost()

virtual void juce::Component::focusLost ( FocusChangeType cause )

virtualinherited

Called to indicate that this component has just lost the keyboard focus.

See also: focusGained, setWantsKeyboardFocus, getCurrentlyFocusedComponent, hasKeyboardFocus

Reimplemented in juce::TextEditor, juce::Button, juce::ComboBox, juce::CodeEditorComponent, juce::MidiKeyboardComponent, and juce::XEmbedComponent.

◆ focusOfChildComponentChanged()

virtual void juce::Component::focusOfChildComponentChanged ( FocusChangeType cause )

virtualinherited

Called to indicate a change in whether or not this component is the parent of the currently-focused component.

Essentially this is called when the return value of a call to hasKeyboardFocus (true) has changed. It happens when focus moves from one of this component's children (at any depth) to a component that isn't contained in this one, (or vice-versa). Note that this method does NOT get called to when focus simply moves from one of its child components to another.

See also: focusGained, setWantsKeyboardFocus, getCurrentlyFocusedComponent, hasKeyboardFocus

Reimplemented in juce::Slider, and juce::TopLevelWindow.

◆ getAlpha()

float juce::Component::getAlpha ( ) const

noexceptinherited

Returns the component's current transparancy level.

See setAlpha() for more details.

◆ getBottom()

int juce::Component::getBottom ( ) const

inlinenoexceptinherited

Returns the y coordinate of the bottom edge of this component.

This is a distance in pixels from the top edge of the component's parent.

Note that if you've used setTransform() to apply a transform, then the component's bounds will no longer be a direct reflection of the position at which it appears within its parent, as the transform will be applied to its bounding box.

◆ getBounds()

Rectangle<int> juce::Component::getBounds ( ) const

inlinenoexceptinherited

Returns this component's bounding box.

The rectangle returned is relative to the top-left of the component's parent.

Note that if you've used setTransform() to apply a transform, then the component's bounds will no longer be a direct reflection of the position at which it appears within its parent, as the transform will be applied to its bounding box.

◆ getBoundsInParent()

Rectangle<int> juce::Component::getBoundsInParent ( ) const

noexceptinherited

Returns the area of this component's parent which this component covers.

The returned area is relative to the parent's coordinate space. If the component has an affine transform specified, then the resulting area will be the smallest rectangle that fully covers the component's transformed bounding box. If this component has no parent, the return value will simply be the same as getBounds().

◆ getCachedComponentImage()

CachedComponentImage* juce::Component::getCachedComponentImage ( ) const

inlinenoexceptinherited

Returns the object that was set by setCachedComponentImage().

See also: setCachedComponentImage

◆ getChildComponent()

Component* juce::Component::getChildComponent ( int index ) const

noexceptinherited

Returns one of this component's child components, by it index.

The component with index 0 is at the back of the z-order, the one at the front will have index (getNumChildComponents() - 1).

If the index is out-of-range, this will return a null pointer.

See also: getChildren, getNumChildComponents, getIndexOfChildComponent

◆ getChildren()

const Array<Component*>& juce::Component::getChildren ( ) const

inlinenoexceptinherited

Provides access to the underlying array of child components.

The most likely reason you may want to use this is for iteration in a range-based for loop.

◆ getComponentAt() [1/2]

Component* juce::Component::getComponentAt	(	int	x,
		int	y
	)

inherited

Returns the component at a certain point within this one.

Parameters

x	the x coordinate to test, relative to this component's left edge.
y	the y coordinate to test, relative to this component's top edge.

Returns: the component that is at this position - which may be 0, this component, or one of its children. Note that overlapping siblings that might actually be in the way are not taken into account by this method - to account for these, instead call getComponentAt on the top-level parent of this component.

See also: hitTest, contains, reallyContains

◆ getComponentAt() [2/2]

Component* juce::Component::getComponentAt ( Point< int > position )

inherited

Returns the component at a certain point within this one.

Parameters

position the coordinate to test, relative to this component's top-left.

Returns: the component that is at this position - which may be 0, this component, or one of its children. Note that overlapping siblings that might actually be in the way are not taken into account by this method - to account for these, instead call getComponentAt on the top-level parent of this component.

See also: hitTest, contains, reallyContains

◆ getComponentEffect()

ImageEffectFilter* juce::Component::getComponentEffect ( ) const

inlinenoexceptinherited

Returns the current component effect.

See also: setComponentEffect

References JUCE_CALLTYPE.

◆ getComponentID()

const String& juce::Component::getComponentID ( ) const

inlinenoexceptinherited

Returns the ID string that was set by setComponentID().

See also: setComponentID, findChildWithID

◆ getCurrentlyFocusedComponent()

static Component* juce::Component::getCurrentlyFocusedComponent ( )

staticnoexceptinherited

Returns the component that currently has the keyboard focus.

Returns: the focused component, or null if nothing is focused.

◆ getCurrentlyModalComponent()

static Component* juce::Component::getCurrentlyModalComponent ( int index = 0 )

staticnoexceptinherited

Returns one of the components that are currently modal.

The index specifies which of the possible modal components to return. The order of the components in this list is the reverse of the order in which they became modal - so the component at index 0 is always the active component, and the others are progressively earlier ones that are themselves now blocked by later ones.

Returns: the modal component, or null if no components are modal (or if the index is out of range)

See also: getNumCurrentlyModalComponents, runModalLoop, isCurrentlyModal

◆ getDesktopScaleFactor()

virtual float juce::Component::getDesktopScaleFactor ( ) const

virtualinherited

Returns the default scale factor to use for this component when it is placed on the desktop.

The default implementation of this method just returns the value from Desktop::getGlobalScaleFactor(), but it can be overridden if a particular component has different requirements. The method only used if this component is added to the desktop - it has no effect for child components.

Referenced by juce::CarbonViewWrapperComponent::setEmbeddedWindowToOurSize().

◆ getExplicitFocusOrder()

int juce::Component::getExplicitFocusOrder ( ) const

inherited

Returns the focus order of this component, if one has been specified.

By default components don't have a focus order - in that case, this will return 0. Lower numbers indicate that the component will be earlier in the focus traversal order.

To change the order, call setExplicitFocusOrder().

The focus order may be used by the KeyboardFocusTraverser class as part of its algorithm for deciding the order in which components should be traversed. See the KeyboardFocusTraverser class for more details on this.

See also: moveKeyboardFocusToSibling, createFocusTraverser, KeyboardFocusTraverser

◆ getHeight()

int juce::Component::getHeight ( ) const

inlinenoexceptinherited

Returns the component's height in pixels.

Referenced by juce::CarbonViewWrapperComponent::createWindow(), juce::CarbonViewWrapperComponent::setEmbeddedWindowToOurSize(), and juce::CarbonViewWrapperComponent::setOurSizeToEmbeddedViewSize().

◆ getIndexOfChildComponent()

int juce::Component::getIndexOfChildComponent ( const Component * child ) const

noexceptinherited

Returns the index of this component in the list of child components.

A value of 0 means it is first in the list (i.e. behind all other components). Higher values are further towards the front.

Returns -1 if the component passed-in is not a child of this component.

See also: getChildren, getNumChildComponents, getChildComponent, addChildComponent, toFront, toBack, toBehind

◆ getInterceptsMouseClicks()

void juce::Component::getInterceptsMouseClicks	(	bool &	allowsClicksOnThisComponent,
		bool &	allowsClicksOnChildComponents
	)		const

noexceptinherited

Retrieves the current state of the mouse-click interception flags.

On return, the two parameters are set to the state used in the last call to setInterceptsMouseClicks().

See also: setInterceptsMouseClicks

◆ getLocalArea()

Rectangle<int> juce::Component::getLocalArea	(	const Component *	sourceComponent,
		Rectangle< int >	areaRelativeToSourceComponent
	)		const

inherited

Converts a rectangle to be relative to this component's coordinate space.

This takes a rectangle that is relative to a different component, and returns its position relative to this component. If the sourceComponent parameter is null, the source rectangle is assumed to be a screen coordinate.

If you've used setTransform() to apply one or more transforms to components, then the source rectangle may not actually be rectanglular when converted to the target space, so in that situation this will return the smallest rectangle that fully contains the transformed area.

Referenced by juce::OpenGLContext::NativeContext::NativeContext().

◆ getLocalBounds()

Rectangle<int> juce::Component::getLocalBounds ( ) const

noexceptinherited

Returns the component's bounds, relative to its own origin.

This is like getBounds(), but returns the rectangle in local coordinates, In practice, it'll return a rectangle with position (0, 0), and the same size as this component.

Referenced by juce::OpenGLContext::NativeContext::NativeContext().

◆ getLocalPoint() [1/2]

Point<int> juce::Component::getLocalPoint	(	const Component *	sourceComponent,
		Point< int >	pointRelativeToSourceComponent
	)		const

inherited

Converts a point to be relative to this component's coordinate space.

This takes a point relative to a different component, and returns its position relative to this component. If the sourceComponent parameter is null, the source point is assumed to be a global screen coordinate.

◆ getLocalPoint() [2/2]

Point<float> juce::Component::getLocalPoint	(	const Component *	sourceComponent,
		Point< float >	pointRelativeToSourceComponent
	)		const

inherited

Converts a point to be relative to this component's coordinate space.

This takes a point relative to a different component, and returns its position relative to this component. If the sourceComponent parameter is null, the source point is assumed to be a global screen coordinate.

◆ getLookAndFeel()

LookAndFeel& juce::Component::getLookAndFeel ( ) const

noexceptinherited

Finds the appropriate look-and-feel to use for this component.

If the component hasn't had a look-and-feel explicitly set, this will return the parent's look-and-feel, or just the default one if there's no parent.

See also: setLookAndFeel, lookAndFeelChanged

◆ getMouseClickGrabsKeyboardFocus()

bool juce::Component::getMouseClickGrabsKeyboardFocus ( ) const

noexceptinherited

Returns the last value set with setMouseClickGrabsKeyboardFocus().

See setMouseClickGrabsKeyboardFocus() for more info.

◆ getMouseCursor()

virtual MouseCursor juce::Component::getMouseCursor ( )

virtualinherited

Returns the mouse cursor shape to use when the mouse is over this component.

The default implementation will return the cursor that was set by setCursor() but can be overridden for more specialised purposes, e.g. returning different cursors depending on the mouse position.

See also: MouseCursor

Reimplemented in juce::TableHeaderComponent.

◆ getMouseXYRelative()

Point<int> juce::Component::getMouseXYRelative ( ) const

inherited

Returns the mouse's current position, relative to this component.

The return value is relative to the component's top-left corner.

◆ getName()

const String& juce::Component::getName ( ) const

inlinenoexceptinherited

Returns the name of this component.

See also: setName

References juce::BlocksProtocol::setName.

◆ getNumChildComponents()

int juce::Component::getNumChildComponents ( ) const

noexceptinherited

Returns the number of child components that this component contains.

See also: getChildren, getChildComponent, getIndexOfChildComponent

◆ getNumCurrentlyModalComponents()

static int juce::Component::getNumCurrentlyModalComponents ( )

staticnoexceptinherited

Returns the number of components that are currently in a modal state.

See also: getCurrentlyModalComponent

◆ getParentComponent()

Component* juce::Component::getParentComponent ( ) const

inlinenoexceptinherited

Returns the component which this component is inside.

If this is the highest-level component or hasn't yet been added to a parent, this will return null.

Referenced by juce::CarbonViewWrapperComponent::setOurSizeToEmbeddedViewSize().

◆ getParentHeight()

int juce::Component::getParentHeight ( ) const

noexceptinherited

Returns the height of the component's parent.

If the component has no parent (i.e. if it's on the desktop), this will return the height of the screen.

◆ getParentMonitorArea()

Rectangle<int> juce::Component::getParentMonitorArea ( ) const

inherited

Returns the screen coordinates of the monitor that contains this component.

If there's only one monitor, this will return its size - if there are multiple monitors, it will return the area of the monitor that contains the component's centre.

◆ getParentWidth()

int juce::Component::getParentWidth ( ) const

noexceptinherited

Returns the width of the component's parent.

If the component has no parent (i.e. if it's on the desktop), this will return the width of the screen.

◆ getPeer()

ComponentPeer* juce::Component::getPeer ( ) const

inherited

Returns the heavyweight window that contains this component.

If this component is itself on the desktop, this will return the window object that it is using. Otherwise, it will return the window of its top-level parent component.

This may return nullptr if there isn't a desktop component.

See also: addToDesktop, isOnDesktop

Referenced by juce::OpenGLContext::NativeContext::NativeContext(), juce::OpenGLContext::NativeContext::updateWindowPosition(), and juce::OpenGLContext::NativeContext::~NativeContext().

◆ getPosition()

Point<int> juce::Component::getPosition ( ) const

inlinenoexceptinherited

Returns the component's top-left position as a Point.

◆ getPositioner()

Positioner* juce::Component::getPositioner ( ) const

noexceptinherited

Returns the Positioner object that has been set for this component.

See also: setPositioner()

◆ getProperties() [1/2]

NamedValueSet& juce::Component::getProperties ( )

inlinenoexceptinherited

Returns the set of properties that belong to this component.

Each component has a NamedValueSet object which you can use to attach arbitrary items of data to it.

◆ getProperties() [2/2]

const NamedValueSet& juce::Component::getProperties ( ) const

inlinenoexceptinherited

Returns the set of properties that belong to this component.

Each component has a NamedValueSet object which you can use to attach arbitrary items of data to it.

◆ getRight()

int juce::Component::getRight ( ) const

inlinenoexceptinherited

Returns the x coordinate of the component's right-hand edge.

This is a distance in pixels from the left edge of the component's parent.

Note that if you've used setTransform() to apply a transform, then the component's bounds will no longer be a direct reflection of the position at which it appears within its parent, as the transform will be applied to its bounding box.

◆ getScreenBounds()

Rectangle<int> juce::Component::getScreenBounds ( ) const

inherited

Returns the bounds of this component, relative to the screen's top-left.

See also: getScreenPosition

Referenced by juce::CarbonViewWrapperComponent::setEmbeddedWindowToOurSize().

◆ getScreenPosition()

Point<int> juce::Component::getScreenPosition ( ) const

inherited

Returns the position of this component's top-left corner relative to the screen's top-left.

See also: getScreenBounds

◆ getScreenX()

int juce::Component::getScreenX ( ) const

inherited

Returns this component's x coordinate relative the screen's top-left origin.

See also: getX, localPointToGlobal

Referenced by juce::CarbonViewWrapperComponent::createWindow().

◆ getScreenY()

int juce::Component::getScreenY ( ) const

inherited

Returns this component's y coordinate relative the screen's top-left origin.

See also: getY, localPointToGlobal

Referenced by juce::CarbonViewWrapperComponent::createWindow().

◆ getThumbSize()

void juce::ImagePreviewComponent::getThumbSize	(	int &	w,
		int &	h
	)		const

private

◆ getTimerInterval()

int juce::Timer::getTimerInterval ( ) const

inlinenoexceptinherited

Returns the timer's interval.

Returns: the timer's interval in milliseconds if it's running, or 0 if it's not.

References JUCE_CALLTYPE.

Referenced by juce::CarbonViewWrapperComponent::setOurSizeToEmbeddedViewSize().

◆ getTopLevelComponent()

Component* juce::Component::getTopLevelComponent ( ) const

noexceptinherited

Returns the highest-level component which contains this one or its parents.

This will search upwards in the parent-hierarchy from this component, until it finds the highest one that doesn't have a parent (i.e. is on the desktop or not yet added to a parent), and will return that.

Referenced by juce::CarbonViewWrapperComponent::carbonEventHandler(), juce::CarbonViewWrapperComponent::componentMovedOrResized(), juce::OpenGLContext::NativeContext::createNativeWindow(), juce::OpenGLContext::NativeContext::NativeContext(), and juce::CarbonViewWrapperComponent::setEmbeddedWindowToOurSize().

◆ getTransform()

AffineTransform juce::Component::getTransform ( ) const

inherited

Returns the transform that is currently being applied to this component.

For more details about transforms, see setTransform().

See also: setTransform

◆ getViewportIgnoreDragFlag()

bool juce::Component::getViewportIgnoreDragFlag ( ) const

inlinenoexceptinherited

Retrieves the current state of the Viewport drag-to-scroll functionality flag.

See also: setViewportIgnoreDragFlag

◆ getWantsKeyboardFocus()

bool juce::Component::getWantsKeyboardFocus ( ) const

noexceptinherited

Returns true if the component is interested in getting keyboard focus.

This returns the flag set by setWantsKeyboardFocus(). The default setting is false.

See also: setWantsKeyboardFocus

◆ getWidth()

int juce::Component::getWidth ( ) const

inlinenoexceptinherited

Returns the component's width in pixels.

Referenced by juce::CarbonViewWrapperComponent::createWindow(), juce::CarbonViewWrapperComponent::setEmbeddedWindowToOurSize(), and juce::CarbonViewWrapperComponent::setOurSizeToEmbeddedViewSize().

◆ getWindowHandle()

void* juce::Component::getWindowHandle ( ) const

inherited

Returns the underlying native window handle for this component.

This is platform-dependent and strictly for power-users only!

Referenced by juce::CarbonViewWrapperComponent::getOwnerWindow().

◆ getX()

int juce::Component::getX ( ) const

inlinenoexceptinherited

Returns the x coordinate of the component's left edge.

This is a distance in pixels from the left edge of the component's parent.

Note that if you've used setTransform() to apply a transform, then the component's bounds will no longer be a direct reflection of the position at which it appears within its parent, as the transform will be applied to its bounding box.

◆ getY()

int juce::Component::getY ( ) const

inlinenoexceptinherited

Returns the y coordinate of the top of this component.

This is a distance in pixels from the top edge of the component's parent.

Note that if you've used setTransform() to apply a transform, then the component's bounds will no longer be a direct reflection of the position at which it appears within its parent, as the transform will be applied to its bounding box.

◆ grabKeyboardFocus()

void juce::Component::grabKeyboardFocus ( )

inherited

Tries to give keyboard focus to this component.

When the user clicks on a component or its grabKeyboardFocus() method is called, the following procedure is used to work out which component should get it:

if the component that was clicked on actually wants focus (as indicated by calling getWantsKeyboardFocus), it gets it.
if the component itself doesn't want focus, it will try to pass it on to whichever of its children is the default component, as determined by KeyboardFocusTraverser::getDefaultComponent()
if none of its children want focus at all, it will pass it up to its parent instead, unless it's a top-level component without a parent, in which case it just takes the focus itself.

Important note! It's obviously not possible for a component to be focused unless it's actually visible, on-screen, and inside a window that is also visible. So there's no point trying to call this in the component's own constructor or before all of its parent hierarchy has been fully instantiated.

See also: setWantsKeyboardFocus, getWantsKeyboardFocus, hasKeyboardFocus, getCurrentlyFocusedComponent, focusGained, focusLost, keyPressed, keyStateChanged

◆ handleCommandMessage()

virtual void juce::Component::handleCommandMessage ( int commandId )

virtualinherited

Called to handle a command that was sent by postCommandMessage().

This is called by the message thread when a command message arrives, and the component can override this method to process it in any way it needs to.

See also: postCommandMessage

Reimplemented in juce::TextEditor, juce::Button, juce::CallOutBox, juce::OpenGLContext::NativeContext::DummyComponent, juce::BurgerMenuComponent, juce::MenuBarComponent, and juce::OpenGLContext::NativeContext::DummyComponent.

◆ hasKeyboardFocus()

bool juce::Component::hasKeyboardFocus ( bool trueIfChildIsFocused ) const

inherited

Returns true if this component currently has the keyboard focus.

Parameters

trueIfChildIsFocused if this is true, then the method returns true if either this component or any of its children (recursively) have the focus. If false, the method only returns true if this component has the focus.

See also: grabKeyboardFocus, setWantsKeyboardFocus, getCurrentlyFocusedComponent, focusGained, focusLost

◆ hitTest()

virtual bool juce::Component::hitTest	(	int	x,
		int	y
	)

virtualinherited

Tests whether a given point is inside the component.

Overriding this method allows you to create components which only intercept mouse-clicks within a user-defined area.

This is called to find out whether a particular x, y coordinate is considered to be inside the component or not, and is used by methods such as contains() and getComponentAt() to work out which component the mouse is clicked on.

Components with custom shapes will probably want to override it to perform some more complex hit-testing.

The default implementation of this method returns either true or false, depending on the value that was set by calling setInterceptsMouseClicks() (true is the default return value).

Note that the hit-test region is not related to the opacity with which areas of a component are painted.

Applications should never call hitTest() directly - instead use the contains() method, because this will also test for occlusion by the component's parent.

Note that for components on the desktop, this method will be ignored, because it's not always possible to implement this behaviour on all platforms.

Parameters

x	the x coordinate to test, relative to the left hand edge of this component. This value is guaranteed to be greater than or equal to zero, and less than the component's width
y	the y coordinate to test, relative to the top edge of this component. This value is guaranteed to be greater than or equal to zero, and less than the component's height

Returns: true if the click is considered to be inside the component

See also: setInterceptsMouseClicks, contains

Reimplemented in juce::LassoComponent< SelectableItemType >, juce::ResizableBorderComponent, juce::CallOutBox, juce::ImageButton, juce::TabBarButton, juce::DrawableShape, juce::DrawableImage, juce::ResizableCornerComponent, and juce::JUCESplashScreen.

◆ inputAttemptWhenModal()

virtual void juce::Component::inputAttemptWhenModal ( )

virtualinherited

Called when the user tries to click on a component that is blocked by another modal component.

When a component is modal and the user clicks on one of the other components, the modal component will receive this callback.

The default implementation of this method will play a beep, and bring the currently modal component to the front, but it can be overridden to do other tasks.

See also: isCurrentlyBlockedByAnotherModalComponent, canModalEventBeSentToComponent

Reimplemented in juce::Label, and juce::CallOutBox.

◆ isAlwaysOnTop()

bool juce::Component::isAlwaysOnTop ( ) const

noexceptinherited

Returns true if this component is set to always stay in front of its siblings.

See also: setAlwaysOnTop

◆ isBroughtToFrontOnMouseClick()

bool juce::Component::isBroughtToFrontOnMouseClick ( ) const

noexceptinherited

Indicates whether the component should be brought to the front when clicked-on.

See also: setBroughtToFrontOnMouseClick

◆ isColourSpecified()

bool juce::Component::isColourSpecified ( int colourID ) const

inherited

Returns true if the specified colour ID has been explicitly set for this component using the setColour() method.

◆ isCurrentlyBlockedByAnotherModalComponent()

bool juce::Component::isCurrentlyBlockedByAnotherModalComponent ( ) const

inherited

Checks whether there's a modal component somewhere that's stopping this one from receiving messages.

If there is a modal component, its canModalEventBeSentToComponent() method will be called to see if it will still allow this component to receive events.

See also: runModalLoop, getCurrentlyModalComponent

◆ isCurrentlyModal()

bool juce::Component::isCurrentlyModal ( bool onlyConsiderForemostModalComponent = true ) const

noexceptinherited

Returns true if this component is the modal one.

It's possible to have nested modal components, e.g. a pop-up dialog box that launches another pop-up. If onlyConsiderForemostModalComponent is true then isCurrentlyModal will only return true for the one at the top of the stack. If onlyConsiderForemostModalComponent is false then isCurrentlyModal will return true for any modal component in the stack.

See also: getCurrentlyModalComponent

◆ isEnabled()

bool juce::Component::isEnabled ( ) const

noexceptinherited

Returns true if the component (and all its parents) are enabled.

Components are enabled by default, and can be disabled with setEnabled(). Exactly what difference this makes to the component depends on the type. E.g. buttons and sliders will choose to draw themselves differently, etc.

Note that if one of this component's parents is disabled, this will always return false, even if this component itself is enabled.

See also: setEnabled, enablementChanged

◆ isFocusContainer()

bool juce::Component::isFocusContainer ( ) const

noexceptinherited

Returns true if this component has been marked as a focus container.

See setFocusContainer() for more details.

See also: setFocusContainer, moveKeyboardFocusToSibling, createFocusTraverser

◆ isMouseButtonDown()

bool juce::Component::isMouseButtonDown ( bool includeChildren = false ) const

inherited

Returns true if the mouse button is currently held down in this component.

Note that this is a test to see whether the mouse is being pressed in this component, so it'll return false if called on component A when the mouse is actually being dragged in component B.

See also: isMouseButtonDownAnywhere, isMouseOver, isMouseOverOrDragging

◆ isMouseButtonDownAnywhere()

static bool juce::Component::isMouseButtonDownAnywhere ( )

staticnoexceptinherited

Returns true if a mouse button is currently down.

Unlike isMouseButtonDown, this will test the current state of the buttons without regard to which component (if any) it has been pressed in.

See also: isMouseButtonDown, ModifierKeys

◆ isMouseOver()

bool juce::Component::isMouseOver ( bool includeChildren = false ) const

inherited

Returns true if the mouse is currently over this component.

If the mouse isn't over the component, this will return false, even if the mouse is currently being dragged - so you can use this in your mouseDrag method to find out whether it's really over the component or not.

Note that when the mouse button is being held down, then the only component for which this method will return true is the one that was originally clicked on.

Also note that on a touch-screen device, this will only return true when a finger is actually down - as soon as all touch is released, isMouseOver will always return false.

If includeChildren is true, then this will also return true if the mouse is over any of the component's children (recursively) as well as the component itself.

See also: isMouseButtonDown. isMouseOverOrDragging, mouseDrag

◆ isMouseOverOrDragging()

bool juce::Component::isMouseOverOrDragging ( bool includeChildren = false ) const

inherited

True if the mouse is over this component, or if it's being dragged in this component.

This is a handy equivalent to (isMouseOver() || isMouseButtonDown()).

See also: isMouseOver, isMouseButtonDown, isMouseButtonDownAnywhere

◆ isOnDesktop()

bool juce::Component::isOnDesktop ( ) const

noexceptinherited

Returns true if this component is currently showing on the desktop.

See also: addToDesktop, removeFromDesktop

◆ isOpaque()

bool juce::Component::isOpaque ( ) const

noexceptinherited

Returns true if no parts of this component are transparent.

Returns: the value that was set by setOpaque, (the default being false)

See also: setOpaque

◆ isPaintingUnclipped()

bool juce::Component::isPaintingUnclipped ( ) const

noexceptinherited

Returns true if this component doesn't require its graphics context to be clipped when it is being painted.

◆ isParentOf()

bool juce::Component::isParentOf ( const Component * possibleChild ) const

noexceptinherited

Checks whether a component is anywhere inside this component or its children.

This will recursively check through this component's children to see if the given component is anywhere inside.

◆ isShowing()

bool juce::Component::isShowing ( ) const

inherited

Tests whether this component and all its parents are visible.

Returns: true only if this component and all its parents are visible.

See also: isVisible

Referenced by juce::CarbonViewWrapperComponent::componentVisibilityChanged(), juce::SidePanel::isPanelShowing(), and juce::CarbonViewWrapperComponent::timerCallback().

◆ isTimerRunning()

bool juce::Timer::isTimerRunning ( ) const

inlinenoexceptinherited

Returns true if the timer is currently running.

◆ isTransformed()

bool juce::Component::isTransformed ( ) const

noexceptinherited

Returns true if a non-identity transform is being applied to this component.

For more details about transforms, see setTransform().

See also: setTransform

◆ isVisible()

bool juce::Component::isVisible ( ) const

inlinenoexceptinherited

Tests whether the component is visible or not.

this doesn't necessarily tell you whether this comp is actually on the screen because this depends on whether all the parent components are also visible - use isShowing() to find this out.

See also: isShowing, setVisible

◆ keyPressed()

virtual bool juce::Component::keyPressed ( const KeyPress & key )

virtualinherited

Called when a key is pressed.

When a key is pressed, the component that has the keyboard focus will have this method called. Remember that a component will only be given the focus if its setWantsKeyboardFocus() method has been used to enable this.

If your implementation returns true, the event will be consumed and not passed on to any other listeners. If it returns false, the key will be passed to any KeyListeners that have been registered with this component. As soon as one of these returns true, the process will stop, but if they all return false, the event will be passed upwards to this component's parent, and so on.

The default implementation of this method does nothing and returns false.

See also: keyStateChanged, getCurrentlyFocusedComponent, addKeyListener

Reimplemented in juce::TreeView, juce::TextEditor, juce::ListBox, juce::Button, juce::AlertWindow, juce::ComboBox, juce::ScrollBar, juce::CodeEditorComponent, juce::MidiKeyboardComponent, juce::Viewport, juce::DialogWindow, juce::FileBrowserComponent, juce::CallOutBox, and juce::MenuBarComponent.

◆ keyStateChanged()

virtual bool juce::Component::keyStateChanged ( bool isKeyDown )

virtualinherited

Called when a key is pressed or released.

Whenever a key on the keyboard is pressed or released (including modifier keys like shift and ctrl), this method will be called on the component that currently has the keyboard focus. Remember that a component will only be given the focus if its setWantsKeyboardFocus() method has been used to enable this.

If your implementation returns true, the event will be consumed and not passed on to any other listeners. If it returns false, then any KeyListeners that have been registered with this component will have their keyStateChanged methods called. As soon as one of these returns true, the process will stop, but if they all return false, the event will be passed upwards to this component's parent, and so on.

The default implementation of this method does nothing and returns false.

To find out which keys are up or down at any time, see the KeyPress::isKeyCurrentlyDown() method.

Parameters

isKeyDown true if a key has been pressed; false if it has been released

See also: keyPressed, KeyPress, getCurrentlyFocusedComponent, addKeyListener

Reimplemented in juce::TextEditor, juce::ListBox, juce::ComboBox, and juce::MidiKeyboardComponent.

Referenced by juce::Button::LookAndFeelMethods::~LookAndFeelMethods().

◆ localAreaToGlobal()

Rectangle<int> juce::Component::localAreaToGlobal ( Rectangle< int > localArea ) const

inherited

Converts a rectangle from this component's coordinate space to a screen coordinate.

If you've used setTransform() to apply one or more transforms to components, then the source rectangle may not actually be rectanglular when converted to the target space, so in that situation this will return the smallest rectangle that fully contains the transformed area.

See also: getLocalPoint, localPointToGlobal

◆ localPointToGlobal() [1/2]

Point<int> juce::Component::localPointToGlobal ( Point< int > localPoint ) const

inherited

Converts a point relative to this component's top-left into a screen coordinate.

See also: getLocalPoint, localAreaToGlobal

◆ localPointToGlobal() [2/2]

Point<float> juce::Component::localPointToGlobal ( Point< float > localPoint ) const

inherited

Converts a point relative to this component's top-left into a screen coordinate.

See also: getLocalPoint, localAreaToGlobal

◆ lookAndFeelChanged()

virtual void juce::Component::lookAndFeelChanged ( )

virtualinherited

Called to let the component react to a change in the look-and-feel setting.

When the look-and-feel is changed for a component, this will be called in all its child components, recursively.

It can also be triggered manually by the sendLookAndFeelChange() method, in case an application uses a LookAndFeel class that might have changed internally.

See also: sendLookAndFeelChange, getLookAndFeel

Reimplemented in juce::Slider, juce::TextEditor, juce::AlertWindow, juce::ComboBox, juce::ScrollBar, juce::ResizableWindow, juce::TabbedButtonBar, juce::Viewport, juce::FileBrowserComponent, juce::SidePanel, juce::FilenameComponent, juce::TabbedComponent, juce::ProgressBar, juce::MultiChoicePropertyComponent, and juce::OnlineUnlockForm.

◆ minimisationStateChanged()

virtual void juce::Component::minimisationStateChanged ( bool isNowMinimised )

virtualinherited

Called for a desktop component which has just been minimised or un-minimised.

This will only be called for components on the desktop.

See also: getPeer, ComponentPeer::setMinimised, ComponentPeer::isMinimised

◆ modifierKeysChanged()

virtual void juce::Component::modifierKeysChanged ( const ModifierKeys & modifiers )

virtualinherited

Called when a modifier key is pressed or released.

Whenever the shift, control, alt or command keys are pressed or released, this method will be called on the component that currently has the keyboard focus. Remember that a component will only be given the focus if its setWantsKeyboardFocus() method has been used to enable this.

The default implementation of this method actually calls its parent's modifierKeysChanged method, so that focused components which aren't interested in this will give their parents a chance to act on the event instead.

See also: keyStateChanged, ModifierKeys

Reimplemented in juce::Slider.

◆ mouseDoubleClick()

void juce::Component::mouseDoubleClick ( const MouseEvent & event )

overridevirtualinherited

Called when a mouse button has been double-clicked on a component.

The MouseEvent object passed in contains lots of methods for finding out which button was pressed, as well as which modifier keys (e.g. shift, ctrl) were held down at the time.

Parameters

event details about the position and status of the mouse event, including the source component in which it occurred

See also: mouseDown, mouseUp

Reimplemented from juce::MouseListener.

Reimplemented in juce::Slider, juce::TextEditor, juce::CodeEditorComponent, and juce::Label.

◆ mouseDown()

void juce::Component::mouseDown ( const MouseEvent & event )

overridevirtualinherited

Called when a mouse button is pressed.

The MouseEvent object passed in contains lots of methods for finding out which button was pressed, as well as which modifier keys (e.g. shift, ctrl) were held down at the time.

Once a button is held down, the mouseDrag method will be called when the mouse moves, until the button is released.

Parameters

event details about the position and status of the mouse event, including the source component in which it occurred

See also: mouseUp, mouseDrag, mouseDoubleClick, contains

Reimplemented from juce::MouseListener.

Reimplemented in juce::Slider, juce::TextEditor, juce::AlertWindow, juce::TableHeaderComponent, juce::ScrollBar, juce::ComboBox, juce::ResizableWindow, juce::CodeEditorComponent, juce::Toolbar, juce::ResizableBorderComponent, juce::StretchableLayoutResizerBar, juce::ResizableEdgeComponent, juce::MenuBarComponent, and juce::ResizableCornerComponent.

◆ mouseDrag()

void juce::Component::mouseDrag ( const MouseEvent & event )

overridevirtualinherited

Called when the mouse is moved while a button is held down.

When a mouse button is pressed inside a component, that component receives mouseDrag callbacks each time the mouse moves, even if the mouse strays outside the component's bounds.

Parameters

event details about the position and status of the mouse event, including the source component in which it occurred

See also: mouseDown, mouseUp, mouseMove, contains, setDragRepeatInterval

Reimplemented from juce::MouseListener.

Reimplemented in juce::Slider, juce::TextEditor, juce::AlertWindow, juce::TableHeaderComponent, juce::ScrollBar, juce::ComboBox, juce::ResizableWindow, juce::CodeEditorComponent, juce::ResizableBorderComponent, juce::SidePanel, juce::StretchableLayoutResizerBar, juce::ResizableEdgeComponent, juce::MenuBarComponent, and juce::ResizableCornerComponent.

◆ mouseEnter()

void juce::Component::mouseEnter ( const MouseEvent & event )

overridevirtualinherited

Called when the mouse first enters a component.

If the mouse button isn't pressed and the mouse moves into a component, this will be called to let the component react to this.

When the mouse button is pressed and held down while being moved in or out of a component, no mouseEnter or mouseExit callbacks are made - only mouseDrag messages are sent to the component that the mouse was originally clicked on, until the button is released.

Parameters

event details about the position and status of the mouse event, including the source component in which it occurred

See also: mouseExit, mouseDrag, mouseMove, contains

Reimplemented from juce::MouseListener.

Reimplemented in juce::Slider, juce::TableHeaderComponent, juce::ResizableBorderComponent, juce::TooltipWindow, and juce::MenuBarComponent.

◆ mouseExit()

void juce::Component::mouseExit ( const MouseEvent & event )

overridevirtualinherited

Called when the mouse moves out of a component.

This will be called when the mouse moves off the edge of this component.

If the mouse button was pressed, and it was then dragged off the edge of the component and released, then this callback will happen when the button is released, after the mouseUp callback.

Parameters

event details about the position and status of the mouse event, including the source component in which it occurred

See also: mouseEnter, mouseDrag, mouseMove, contains

Reimplemented from juce::MouseListener.

Reimplemented in juce::Slider, juce::TableHeaderComponent, and juce::MenuBarComponent.

◆ mouseMagnify()

void juce::Component::mouseMagnify	(	const MouseEvent &	event,
		float	scaleFactor
	)

overridevirtualinherited

Called when a pinch-to-zoom mouse-gesture is used.

If not overridden, a component will forward this message to its parent, so that parent components can collect gesture messages that are unused by child components.

Parameters

event	details about the mouse event
scaleFactor	a multiplier to indicate by how much the size of the target should be changed. A value of 1.0 would indicate no change, values greater than 1.0 mean it should be enlarged.

Reimplemented from juce::MouseListener.

◆ mouseMove()

void juce::Component::mouseMove ( const MouseEvent & event )

overridevirtualinherited

Called when the mouse moves inside a component.

If the mouse button isn't pressed and the mouse moves over a component, this will be called to let the component react to this.

A component will always get a mouseEnter callback before a mouseMove.

Parameters

event details about the position and status of the mouse event, including the source component in which it occurred

See also: mouseEnter, mouseExit, mouseDrag, contains

Reimplemented from juce::MouseListener.

Reimplemented in juce::Slider, juce::TableHeaderComponent, juce::ResizableBorderComponent, and juce::MenuBarComponent.

◆ mouseUp()

void juce::Component::mouseUp ( const MouseEvent & event )

overridevirtualinherited

Called when a mouse button is released.

A mouseUp callback is sent to the component in which a button was pressed even if the mouse is actually over a different component when the button is released.

The MouseEvent object passed in contains lots of methods for finding out which buttons were down just before they were released.

Parameters

event details about the position and status of the mouse event, including the source component in which it occurred

See also: mouseDown, mouseDrag, mouseDoubleClick, contains

Reimplemented from juce::MouseListener.

Reimplemented in juce::Slider, juce::TextEditor, juce::ListBox, juce::TableHeaderComponent, juce::ScrollBar, juce::ComboBox, juce::ResizableWindow, juce::CodeEditorComponent, juce::Label, juce::ResizableBorderComponent, juce::SidePanel, juce::BurgerMenuComponent, juce::ResizableEdgeComponent, juce::MenuBarComponent, juce::ResizableCornerComponent, and juce::JUCESplashScreen.

◆ mouseWheelMove()

void juce::Component::mouseWheelMove	(	const MouseEvent &	event,
		const MouseWheelDetails &	wheel
	)

overridevirtualinherited

Called when the mouse-wheel is moved.

This callback is sent to the component that the mouse is over when the wheel is moved.

If not overridden, a component will forward this message to its parent, so that parent components can collect mouse-wheel messages that happen to child components which aren't interested in them. (Bear in mind that if you attach a component as a mouse-listener to other components, then those wheel moves will also end up calling this method and being passed up to the parents, which may not be what you intended to happen).

Parameters

event	details about the mouse event
wheel	details about the mouse wheel movement

Reimplemented from juce::MouseListener.

Reimplemented in juce::Slider, juce::TextEditor, juce::ListBox, juce::ComboBox, juce::ScrollBar, juce::CodeEditorComponent, and juce::Viewport.

◆ moved()

virtual void juce::Component::moved ( )

virtualinherited

Called when this component's position has been changed.

This is called when the position relative to its parent changes, not when its absolute position on the screen changes (so it won't be called for all child components when a parent component is moved).

The method is called synchronously as a result of the setBounds, setTopLeftPosition or any of the other repositioning methods, and like resized(), it will be called each time those methods are called.

If the component is a top-level window on the desktop, its position could also be changed by operating-system factors beyond the application's control.

See also: resized, setBounds

Reimplemented in juce::ResizableWindow, juce::CallOutBox, and juce::SidePanel.

◆ moveKeyboardFocusToSibling()

void juce::Component::moveKeyboardFocusToSibling ( bool moveToNext )

inherited

Tries to move the keyboard focus to one of this component's siblings.

This will try to move focus to either the next or previous component. (This is the method that is used when shifting focus by pressing the tab key).

Components for which getWantsKeyboardFocus() returns false are not looked at.

Parameters

moveToNext if true, the focus will move forwards; if false, it will move backwards

See also: grabKeyboardFocus, setFocusContainer, setWantsKeyboardFocus

◆ paint()

void juce::ImagePreviewComponent::paint ( Graphics & )

overridevirtual

Reimplemented from juce::Component.

◆ paintEntireComponent()

void juce::Component::paintEntireComponent	(	Graphics &	context,
		bool	ignoreAlphaLevel
	)

inherited

Draws this component and all its subcomponents onto the specified graphics context.

You should very rarely have to use this method, it's simply there in case you need to draw a component with a custom graphics context for some reason, e.g. for creating a snapshot of the component.

It calls paint(), paintOverChildren() and recursively calls paintEntireComponent() on its children in order to render the entire tree.

The graphics context may be left in an undefined state after this method returns, so you may need to reset it if you're going to use it again.

If ignoreAlphaLevel is false, then the component will be drawn with the opacity level specified by getAlpha(); if ignoreAlphaLevel is true, then this will be ignored and an alpha of 1.0 will be used.

◆ paintOverChildren()

virtual void juce::Component::paintOverChildren ( Graphics & g )

virtualinherited

Components can override this method to draw over the top of their children.

For most drawing operations, it's better to use the normal paint() method, but if you need to overlay something on top of the children, this can be used.

See also: paint, Graphics

Reimplemented in juce::TextEditor, juce::ListBox, and juce::FilenameComponent.

◆ parentHierarchyChanged()

virtual void juce::Component::parentHierarchyChanged ( )

virtualinherited

Called to indicate that the component's parents have changed.

When a component is added or removed from its parent, this method will be called on all of its children (recursively - so all children of its children will also be called as well).

Subclasses can override this if they need to react to this in some way.

See also: getParentComponent, isShowing, ComponentListener::componentParentHierarchyChanged

Reimplemented in juce::TextEditor, juce::ListBox, juce::Button, juce::ComboBox, juce::ScrollBar, juce::Drawable, juce::SidePanel, juce::TopLevelWindow, juce::WebBrowserComponent, juce::KeyMappingEditorComponent, juce::DrawableComposite, and juce::JUCESplashScreen.

◆ parentSizeChanged()

virtual void juce::Component::parentSizeChanged ( )

virtualinherited

Called when this component's immediate parent has been resized.

If the component is a top-level window, this indicates that the screen size has changed.

See also: childBoundsChanged, moved, resized

Reimplemented in juce::ResizableWindow, and juce::JUCESplashScreen.

◆ postCommandMessage()

void juce::Component::postCommandMessage ( int commandId )

inherited

Dispatches a numbered message to this component.

This is a quick and cheap way of allowing simple asynchronous messages to be sent to components. It's also safe, because if the component that you send the message to is a null or dangling pointer, this won't cause an error.

The command ID is later delivered to the component's handleCommandMessage() method by the application's message queue.

See also: handleCommandMessage

◆ proportionOfHeight()

int juce::Component::proportionOfHeight ( float proportion ) const

noexceptinherited

Returns a proportion of the component's height.

This is a handy equivalent of (getHeight() * proportion).

◆ proportionOfWidth()

int juce::Component::proportionOfWidth ( float proportion ) const

noexceptinherited

Returns a proportion of the component's width.

This is a handy equivalent of (getWidth() * proportion).

◆ reallyContains()

bool juce::Component::reallyContains	(	Point< int >	localPoint,
		bool	returnTrueIfWithinAChild
	)

inherited

Returns true if a given point lies in this component, taking any overlapping siblings into account.

Parameters

localPoint	the coordinate to test, relative to this component's top-left.
returnTrueIfWithinAChild	if the point actually lies within a child of this component, this determines whether that is counted as a hit.

See also: contains, getComponentAt

◆ removeAllChildren()

void juce::Component::removeAllChildren ( )

inherited

Removes all this component's children.

Note that this won't delete them! To do that, use deleteAllChildren() instead.

◆ removeChildComponent() [1/2]

void juce::Component::removeChildComponent ( Component * childToRemove )

inherited

Removes one of this component's child-components.

If the child passed-in isn't actually a child of this component (either because it's invalid or is the child of a different parent), then no action is taken.

Note that removing a child will not delete it! But it's ok to delete a component without first removing it - doing so will automatically remove it and send out the appropriate notifications before the deletion completes.

See also: addChildComponent, ComponentListener::componentChildrenChanged

◆ removeChildComponent() [2/2]

Component* juce::Component::removeChildComponent ( int childIndexToRemove )

inherited

Removes one of this component's child-components by index.

This will return a pointer to the component that was removed, or null if the index was out-of-range.

Note that removing a child will not delete it! But it's ok to delete a component without first removing it - doing so will automatically remove it and send out the appropriate notifications before the deletion completes.

See also: addChildComponent, ComponentListener::componentChildrenChanged

◆ removeColour()

void juce::Component::removeColour ( int colourID )

inherited

If a colour has been set with setColour(), this will remove it.

This allows you to make a colour revert to its default state.

◆ removeComponentListener()

void juce::Component::removeComponentListener ( ComponentListener * listenerToRemove )

inherited

Removes a component listener.

See also: addComponentListener

◆ removeFromDesktop()

void juce::Component::removeFromDesktop ( )

inherited

If the component is currently showing on the desktop, this will hide it.

You can also use setVisible() to hide a desktop window temporarily, but removeFromDesktop() will free any system resources that are being used up.

See also: addToDesktop, isOnDesktop

◆ removeKeyListener()

void juce::Component::removeKeyListener ( KeyListener * listenerToRemove )

inherited

Removes a previously-registered key listener.

See also: addKeyListener

◆ removeMouseListener()

void juce::Component::removeMouseListener ( MouseListener * listenerToRemove )

inherited

Deregisters a mouse listener.

See also: addMouseListener, MouseListener

◆ repaint() [1/3]

void juce::Component::repaint ( )

inherited

Marks the whole component as needing to be redrawn.

Calling this will not do any repainting immediately, but will mark the component as 'dirty'. At some point in the near future the operating system will send a paint message, which will redraw all the dirty regions of all components. There's no guarantee about how soon after calling repaint() the redraw will actually happen, and other queued events may be delivered before a redraw is done.

If the setBufferedToImage() method has been used to cause this component to use a buffer, the repaint() call will invalidate the cached buffer. If setCachedComponentImage() has been used to provide a custom image cache, that cache will be invalidated appropriately.

To redraw just a subsection of the component rather than the whole thing, use the repaint (int, int, int, int) method.

See also: paint

Referenced by juce::OpenGLContext::NativeContext::NativeContext().

◆ repaint() [2/3]

void juce::Component::repaint	(	int	x,
		int	y,
		int	width,
		int	height
	)

inherited

Marks a subsection of this component as needing to be redrawn.

Calling this will not do any repainting immediately, but will mark the given region of the component as 'dirty'. At some point in the near future the operating system will send a paint message, which will redraw all the dirty regions of all components. There's no guarantee about how soon after calling repaint() the redraw will actually happen, and other queued events may be delivered before a redraw is done.

The region that is passed in will be clipped to keep it within the bounds of this component.

See also: repaint()

◆ repaint() [3/3]

void juce::Component::repaint ( Rectangle< int > area )

inherited

Marks a subsection of this component as needing to be redrawn.

Calling this will not do any repainting immediately, but will mark the given region of the component as 'dirty'. At some point in the near future the operating system will send a paint message, which will redraw all the dirty regions of all components. There's no guarantee about how soon after calling repaint() the redraw will actually happen, and other queued events may be delivered before a redraw is done.

The region that is passed in will be clipped to keep it within the bounds of this component.

See also: repaint()

◆ resized()

virtual void juce::Component::resized ( )

virtualinherited

Called when this component's size has been changed.

A component can implement this method to do things such as laying out its child components when its width or height changes.

The method is called synchronously as a result of the setBounds or setSize methods, so repeatedly changing a components size will repeatedly call its resized method (unlike things like repainting, where multiple calls to repaint are coalesced together).

If the component is a top-level window on the desktop, its size could also be changed by operating-system factors beyond the application's control.

See also: moved, setSize

Reimplemented in juce::Slider, juce::TreeView, juce::StandaloneFilterWindow::MainContentComponent::NotificationArea, juce::StandaloneFilterWindow::MainContentComponent, juce::StandaloneFilterWindow, juce::TextEditor, juce::ListBox, juce::StandalonePluginHolder::SettingsComponent, juce::ComboBox, juce::ScrollBar, juce::ResizableWindow, juce::CodeEditorComponent, juce::TableListBox, juce::TabbedButtonBar, juce::Label, juce::Toolbar, juce::MidiKeyboardComponent, juce::Viewport, juce::MultiDocumentPanel, juce::DialogWindow, juce::FileBrowserComponent, juce::FilenameComponent, juce::TabbedComponent, juce::ToolbarItemComponent, juce::VideoComponent, juce::DrawableButton, juce::PropertyPanel, juce::ColourSelector, juce::CallOutBox, juce::SidePanel, juce::PreferencesPanel, juce::WebBrowserComponent, juce::PluginListComponent, juce::ConcertinaPanel, juce::TabBarButton, juce::KeyMappingEditorComponent, juce::MultiChoicePropertyComponent, juce::PropertyComponent, juce::AudioDeviceSelectorComponent, juce::FileSearchPathListComponent, juce::BurgerMenuComponent, juce::ToolbarButton, juce::MenuBarComponent, juce::OnlineUnlockForm, juce::ToolbarItemPalette, and juce::GenericAudioProcessorEditor.

◆ runModalLoop()

int juce::Component::runModalLoop ( )

inherited

Runs a component modally, waiting until the loop terminates.

This method first makes the component visible, brings it to the front and gives it the keyboard focus.

It then runs a loop, dispatching messages from the system message queue, but blocking all mouse or keyboard messages from reaching any components other than this one and its children.

This loop continues until the component's exitModalState() method is called (or the component is deleted), and then this method returns, returning the value passed into exitModalState().

Note that you SHOULD NEVER USE THIS METHOD! Modal loops are a dangerous construct because things that happen during the events that they dispatch could affect the state of objects which are currently in use somewhere on the stack, so when the loop finishes and the stack unwinds, horrible problems can occur. This is especially bad in plugins, where the host may choose to delete the plugin during runModalLoop(), so that when it returns, the entire DLL could have been unloaded from memory! Also, some OSes deliberately make it impossible to run modal loops (e.g. Android), so this method won't even exist on some platforms.

See also: enterModalState, exitModalState, isCurrentlyModal, getCurrentlyModalComponent, isCurrentlyBlockedByAnotherModalComponent, ModalComponentManager

◆ selectedFileChanged()

void juce::ImagePreviewComponent::selectedFileChanged ( const File & newSelectedFile )

overridevirtual

Implements juce::FilePreviewComponent.

◆ sendLookAndFeelChange()

void juce::Component::sendLookAndFeelChange ( )

inherited

Calls the lookAndFeelChanged() method in this component and all its children.

This will recurse through the children and their children, calling lookAndFeelChanged() on them all.

See also: lookAndFeelChanged

◆ setAlpha()

void juce::Component::setAlpha ( float newAlpha )

inherited

Changes the transparency of this component.

When painted, the entire component and all its children will be rendered with this as the overall opacity level, where 0 is completely invisible, and 1.0 is fully opaque (i.e. normal).

See also: getAlpha, alphaChanged

◆ setAlwaysOnTop()

void juce::Component::setAlwaysOnTop ( bool shouldStayOnTop )

inherited

Sets whether the component should always be kept at the front of its siblings.

See also: isAlwaysOnTop

◆ setBounds() [1/2]

void juce::Component::setBounds	(	int	x,
		int	y,
		int	width,
		int	height
	)

inherited

Changes the component's position and size.

The coordinates are relative to the top-left of the component's parent, or relative to the origin of the screen if the component is on the desktop.

If this method changes the component's top-left position, it will make a synchronous call to moved(). If it changes the size, it will also make a call to resized().

Note that if you've used setTransform() to apply a transform, then the component's bounds will no longer be a direct reflection of the position at which it appears within its parent, as the transform will be applied to whatever bounds you set for it.

See also: setTopLeftPosition, setSize, ComponentListener::componentMovedOrResized

◆ setBounds() [2/2]

void juce::Component::setBounds ( Rectangle< int > newBounds )

inherited

Changes the component's position and size.

The coordinates are relative to the top-left of the component's parent, or relative to the origin of the screen if the component is on the desktop.

If this method changes the component's top-left position, it will make a synchronous call to moved(). If it changes the size, it will also make a call to resized().

Note that if you've used setTransform() to apply a transform, then the component's bounds will no longer be a direct reflection of the position at which it appears within its parent, as the transform will be applied to whatever bounds you set for it.

See also: setBounds

◆ setBoundsInset()

void juce::Component::setBoundsInset ( BorderSize< int > borders )

inherited

Changes the component's position and size based on the amount of space to leave around it.

This will position the component within its parent, leaving the specified number of pixels around each edge.

See also: setBounds

◆ setBoundsRelative() [1/2]

void juce::Component::setBoundsRelative	(	float	proportionalX,
		float	proportionalY,
		float	proportionalWidth,
		float	proportionalHeight
	)

inherited

Changes the component's position and size in terms of fractions of its parent's size.

The values are factors of the parent's size, so for example setBoundsRelative (0.2f, 0.2f, 0.5f, 0.5f) would give it half the width and height of the parent, with its top-left position 20% of the way across and down the parent.

See also: setBounds

◆ setBoundsRelative() [2/2]

void juce::Component::setBoundsRelative ( Rectangle< float > proportionalArea )

inherited

Changes the component's position and size in terms of fractions of its parent's size.

The values are factors of the parent's size, so for example setBoundsRelative ({ 0.2f, 0.2f, 0.5f, 0.5f }) would give it half the width and height of the parent, with its top-left position 20% of the way across and down the parent.

See also: setBounds

◆ setBoundsToFit()

void juce::Component::setBoundsToFit	(	Rectangle< int >	targetArea,
		Justification	justification,
		bool	onlyReduceInSize
	)

inherited

Positions the component within a given rectangle, keeping its proportions unchanged.

If onlyReduceInSize is false, the component will be resized to fill as much of the rectangle as possible without changing its aspect ratio (the component's current size is used to determine its aspect ratio, so a zero-size component won't work here). If onlyReduceInSize is true, it will only be resized if it's too big to fit inside the rectangle.

It will then be positioned within the rectangle according to the justification flags specified.

See also: setBounds

◆ setBroughtToFrontOnMouseClick()

void juce::Component::setBroughtToFrontOnMouseClick ( bool shouldBeBroughtToFront )

noexceptinherited

Indicates whether the component should be brought to the front when clicked.

Setting this flag to true will cause the component to be brought to the front when the mouse is clicked somewhere inside it or its child components.

Note that a top-level desktop window might still be brought to the front by the operating system when it's clicked, depending on how the OS works.

By default this is set to false.

See also: setMouseClickGrabsKeyboardFocus

◆ setBufferedToImage()

void juce::Component::setBufferedToImage ( bool shouldBeBuffered )

inherited

Makes the component use an internal buffer to optimise its redrawing.

Setting this flag to true will cause the component to allocate an internal buffer into which it paints itself and all its child components, so that when asked to redraw itself, it can use this buffer rather than actually calling the paint() method.

Parts of the buffer are invalidated when repaint() is called on this component or its children. The buffer is then repainted at the next paint() callback.

See also: repaint, paint, createComponentSnapshot

◆ setCachedComponentImage()

void juce::Component::setCachedComponentImage ( CachedComponentImage * newCachedImage )

inherited

Gives the component a CachedComponentImage that should be used to buffer its painting.

The object that is passed-in will be owned by this component, and will be deleted automatically later on.

See also: setBufferedToImage

◆ setCentrePosition() [1/2]

void juce::Component::setCentrePosition	(	int	x,
		int	y
	)

inherited

Changes the position of the component's centre.

Leaves the component's size unchanged, but sets the position of its centre relative to its parent's top-left.

See also: setBounds

◆ setCentrePosition() [2/2]

void juce::Component::setCentrePosition ( Point< int > newCentrePosition )

inherited

Changes the position of the component's centre.

Leaves the component's size unchanged, but sets the position of its centre relative to its parent's top-left.

See also: setBounds

◆ setCentreRelative()

void juce::Component::setCentreRelative	(	float	x,
		float	y
	)

inherited

Changes the position of the component's centre.

Leaves the size unchanged, but positions its centre relative to its parent's size. E.g. setCentreRelative (0.5f, 0.5f) would place it centrally in its parent.

◆ setColour()

void juce::Component::setColour	(	int	colourID,
		Colour	newColour
	)

inherited

Registers a colour to be used for a particular purpose.

Changing a colour will cause a synchronous callback to the colourChanged() method, which your component can override if it needs to do something when colours are altered.

For more details about colour IDs, see the comments for findColour().

See also: findColour, isColourSpecified, colourChanged, LookAndFeel::findColour, LookAndFeel::setColour

◆ setComponentEffect()

void juce::Component::setComponentEffect ( ImageEffectFilter * newEffect )

inherited

Adds an effect filter to alter the component's appearance.

When a component has an effect filter set, then this is applied to the results of its paint() method. There are a few preset effects, such as a drop-shadow or glow, but they can be user-defined as well.

The effect that is passed in will not be deleted by the component - the caller must take care of deleting it.

To remove an effect from a component, pass a null pointer in as the parameter.

See also: ImageEffectFilter, DropShadowEffect, GlowEffect

◆ setComponentID()

void juce::Component::setComponentID ( const String & newID )

inherited

Sets the component's ID string.

You can retrieve the ID using getComponentID().

See also: getComponentID, findChildWithID

◆ setEnabled()

void juce::Component::setEnabled ( bool shouldBeEnabled )

inherited

Enables or disables this component.

Disabling a component will also cause all of its child components to become disabled.

Similarly, enabling a component which is inside a disabled parent component won't make any difference until the parent is re-enabled.

See also: isEnabled, enablementChanged

◆ setExplicitFocusOrder()

void juce::Component::setExplicitFocusOrder ( int newFocusOrderIndex )

inherited

Sets the index used in determining the order in which focusable components should be traversed.

A value of 0 or less is taken to mean that no explicit order is wanted, and that traversal should use other factors, like the component's position.

See also: getExplicitFocusOrder, moveKeyboardFocusToSibling

◆ setFocusContainer()

void juce::Component::setFocusContainer ( bool shouldBeFocusContainer )

noexceptinherited

Indicates whether this component is a parent for components that can have their focus traversed.

This flag is used by the default implementation of the createFocusTraverser() method, which uses the flag to find the first parent component (of the currently focused one) which wants to be a focus container.

So using this method to set the flag to 'true' causes this component to act as the top level within which focus is passed around.

See also: isFocusContainer, createFocusTraverser, moveKeyboardFocusToSibling

◆ setInterceptsMouseClicks()

void juce::Component::setInterceptsMouseClicks	(	bool	allowClicksOnThisComponent,
		bool	allowClicksOnChildComponents
	)

noexceptinherited

Changes the default return value for the hitTest() method.

Setting this to false is an easy way to make a component pass its mouse-clicks through to the components behind it.

When a component is created, the default setting for this is true.

Parameters

allowClicksOnThisComponent	if true, hitTest() will always return true; if false, it will return false (or true for child components if allowClicksOnChildComponents is true)
allowClicksOnChildComponents	if this is true and allowClicksOnThisComponent is false, then child components can be clicked on as normal but clicks on this component pass straight through; if this is false and allowClicksOnThisComponent is false, then neither this component nor any child components can be clicked on

See also: hitTest, getInterceptsMouseClicks

◆ setLookAndFeel()

void juce::Component::setLookAndFeel ( LookAndFeel * newLookAndFeel )

inherited

Sets the look and feel to use for this component.

This will also change the look and feel for any child components that haven't had their look set explicitly.

The object passed in will not be deleted by the component, so it's the caller's responsibility to manage it. It may be used at any time until this component has been deleted.

Calling this method will also invoke the sendLookAndFeelChange() method.

See also: getLookAndFeel, lookAndFeelChanged

◆ setMouseClickGrabsKeyboardFocus()

void juce::Component::setMouseClickGrabsKeyboardFocus ( bool shouldGrabFocus )

inherited

Chooses whether a click on this component automatically grabs the focus.

By default this is set to true, but you might want a component which can be focused, but where you don't want the user to be able to affect it directly by clicking.

◆ setMouseCursor()

void juce::Component::setMouseCursor ( const MouseCursor & cursorType )

inherited

Changes the mouse cursor shape to use when the mouse is over this component.

Note that the cursor set by this method can be overridden by the getMouseCursor method.

See also: MouseCursor

◆ setName()

virtual void juce::Component::setName ( const String & newName )

virtualinherited

Sets the name of this component.

When the name changes, all registered ComponentListeners will receive a ComponentListener::componentNameChanged() callback.

See also: getName

Reimplemented in juce::DocumentWindow.

◆ setOpaque()

void juce::Component::setOpaque ( bool shouldBeOpaque )

inherited

Indicates whether any parts of the component might be transparent.

Components that always paint all of their contents with solid colour and thus completely cover any components behind them should use this method to tell the repaint system that they are opaque.

This information is used to optimise drawing, because it means that objects underneath opaque windows don't need to be painted.

By default, components are considered transparent, unless this is used to make it otherwise.

See also: isOpaque

◆ setPaintingIsUnclipped()

void juce::Component::setPaintingIsUnclipped ( bool shouldPaintWithoutClipping )

noexceptinherited

This allows you to indicate that this component doesn't require its graphics context to be clipped when it is being painted.

Most people will never need to use this setting, but in situations where you have a very large number of simple components being rendered, and where they are guaranteed never to do any drawing beyond their own boundaries, setting this to true will reduce the overhead involved in clipping the graphics context that gets passed to the component's paint() callback. If you enable this mode, you'll need to make sure your paint method doesn't call anything like Graphics::fillAll(), and doesn't draw beyond the component's bounds, because that'll produce artifacts. Your component also can't have any child components that may be placed beyond its bounds.

◆ setPositioner()

void juce::Component::setPositioner ( Positioner * newPositioner )

inherited

Sets a new Positioner object for this component.

If there's currently another positioner set, it will be deleted. The object that is passed in will be deleted automatically by this component when it's no longer required. Pass a null pointer to clear the current positioner.

See also: getPositioner()

◆ setRepaintsOnMouseActivity()

void juce::Component::setRepaintsOnMouseActivity ( bool shouldRepaint )

noexceptinherited

Causes automatic repaints when the mouse enters or exits this component.

If turned on, then when the mouse enters/exits, or when the button is pressed/released on the component, it will trigger a repaint.

This is handy for things like buttons that need to draw themselves differently when the mouse moves over them, and it avoids having to override all the different mouse callbacks and call repaint().

See also: mouseEnter, mouseExit, mouseDown, mouseUp

◆ setSize()

void juce::Component::setSize	(	int	newWidth,
		int	newHeight
	)

inherited

Changes the size of the component.

A synchronous call to resized() will occur if the size actually changes.

Note that if you've used setTransform() to apply a transform, then the component's bounds will no longer be a direct reflection of the position at which it appears within its parent, as the transform will be applied to whatever bounds you set for it.

Referenced by juce::CarbonViewWrapperComponent::setOurSizeToEmbeddedViewSize().

◆ setTopLeftPosition() [1/2]

void juce::Component::setTopLeftPosition	(	int	x,
		int	y
	)

inherited

Moves the component to a new position.

Changes the component's top-left position (without changing its size). The position is relative to the top-left of the component's parent.

If the component actually moves, this method will make a synchronous call to moved().

Note that if you've used setTransform() to apply a transform, then the component's bounds will no longer be a direct reflection of the position at which it appears within its parent, as the transform will be applied to whatever bounds you set for it.

See also: setBounds, ComponentListener::componentMovedOrResized

◆ setTopLeftPosition() [2/2]

void juce::Component::setTopLeftPosition ( Point< int > newTopLeftPosition )

inherited

Moves the component to a new position.

Changes the component's top-left position (without changing its size). The position is relative to the top-left of the component's parent.

If the component actually moves, this method will make a synchronous call to moved().

Note that if you've used setTransform() to apply a transform, then the component's bounds will no longer be a direct reflection of the position at which it appears within its parent, as the transform will be applied to whatever bounds you set for it.

See also: setBounds, ComponentListener::componentMovedOrResized

◆ setTopRightPosition()

void juce::Component::setTopRightPosition	(	int	x,
		int	y
	)

inherited

Moves the component to a new position.

Changes the position of the component's top-right corner (keeping it the same size). The position is relative to the top-left of the component's parent.

If the component actually moves, this method will make a synchronous call to moved().

Note that if you've used setTransform() to apply a transform, then the component's bounds will no longer be a direct reflection of the position at which it appears within its parent, as the transform will be applied to whatever bounds you set for it.

◆ setTransform()

void juce::Component::setTransform ( const AffineTransform & transform )

inherited

Sets a transform matrix to be applied to this component.

If you set a transform for a component, the component's position will be warped by it, relative to the component's parent's top-left origin. This means that the values you pass into setBounds() will no longer reflect the actual area within the parent that the component covers, as the bounds will be transformed and the component will probably end up actually appearing somewhere else within its parent.

When using transforms you need to be extremely careful when converting coordinates between the coordinate spaces of different components or the screen - you should always use getLocalPoint(), getLocalArea(), etc to do this, and never just manually add a component's position to a point in order to convert it between different components (but I'm sure you would never have done that anyway...).

Currently, transforms are not supported for desktop windows, so the transform will be ignored if you put a component on the desktop.

To remove a component's transform, simply pass AffineTransform() as the parameter to this method.

◆ setViewportIgnoreDragFlag()

void juce::Component::setViewportIgnoreDragFlag ( bool ignoreDrag )

inlinenoexceptinherited

Sets a flag to indicate whether mouse drag events on this Component should be ignored when it is inside a Viewport with drag-to-scroll functionality enabled.

This is useful for Components such as sliders that should not move their parent Viewport when dragged.

◆ setVisible()

virtual void juce::Component::setVisible ( bool shouldBeVisible )

virtualinherited

Makes the component visible or invisible.

This method will show or hide the component. Note that components default to being non-visible when first created. Also note that visible components won't be seen unless all their parent components are also visible.

This method will call visibilityChanged() and also componentVisibilityChanged() for any component listeners that are interested in this component.

Parameters

shouldBeVisible whether to show or hide the component

See also: isVisible, isShowing, visibilityChanged, ComponentListener::componentVisibilityChanged

Reimplemented in juce::ScrollBar.

◆ setWantsKeyboardFocus()

void juce::Component::setWantsKeyboardFocus ( bool wantsFocus )

noexceptinherited

Sets a flag to indicate whether this component needs keyboard focus or not.

By default components aren't actually interested in gaining the focus, but this method can be used to turn this on.

See the grabKeyboardFocus() method for details about the way a component is chosen to receive the focus.

See also: grabKeyboardFocus, getWantsKeyboardFocus

◆ startTimer()

void juce::Timer::startTimer ( int intervalInMilliseconds )

noexceptinherited

Starts the timer and sets the length of interval required.

If the timer is already started, this will reset it, so the time between calling this method and the next timer callback will not be less than the interval length passed in.

Parameters

intervalInMilliseconds the interval to use (any value less than 1 will be rounded up to 1)

Referenced by juce::StandalonePluginHolder::init(), and juce::CarbonViewWrapperComponent::setOurSizeToEmbeddedViewSize().

◆ startTimerHz()

void juce::Timer::startTimerHz ( int timerFrequencyHz )

noexceptinherited

Starts the timer with an interval specified in Hertz.

This is effectively the same as calling startTimer (1000 / timerFrequencyHz).

Referenced by juce::AnimatedPosition< Behaviour >::endDrag(), juce::AnimatedPosition< Behaviour >::nudge(), and juce::AnimatedPosition< Behaviour >::timerCallback().

◆ stopTimer()

void juce::Timer::stopTimer ( )

noexceptinherited

Stops the timer.

No more timer callbacks will be triggered after this method returns.

Note that if you call this from a background thread while the message-thread is already in the middle of your callback, then this method will cancel any future timer callbacks, but it will return without waiting for the current one to finish. The current callback will continue, possibly still running some of your timer code after this method has returned.

Referenced by juce::AnimatedPosition< Behaviour >::beginDrag(), juce::CarbonViewWrapperComponent::setOurSizeToEmbeddedViewSize(), juce::AnimatedPosition< Behaviour >::setPosition(), juce::AnimatedPosition< Behaviour >::timerCallback(), and juce::StandalonePluginHolder::~StandalonePluginHolder().

◆ timerCallback()

void juce::ImagePreviewComponent::timerCallback ( )

overridevirtual

Implements juce::Timer.

◆ toBack()

void juce::Component::toBack ( )

inherited

Changes this component's z-order to be at the back of all its siblings.

If the component is set to be 'always-on-top', it will only be moved to the back of the other other 'always-on-top' components.

See also: toFront, toBehind, setAlwaysOnTop

◆ toBehind()

void juce::Component::toBehind ( Component * other )

inherited

Changes this component's z-order so that it's just behind another component.

See also: toFront, toBack

◆ toFront()

void juce::Component::toFront ( bool shouldAlsoGainFocus )

inherited

Brings the component to the front of its siblings.

If some of the component's siblings have had their 'always-on-top' flag set, then they will still be kept in front of this one (unless of course this one is also 'always-on-top').

Parameters

shouldAlsoGainFocus if true, this will also try to assign keyboard focus to the component (see grabKeyboardFocus() for more details)

See also: toBack, toBehind, setAlwaysOnTop

Referenced by juce::CarbonViewWrapperComponent::carbonEventHandler().

◆ unfocusAllComponents()

static void juce::Component::unfocusAllComponents ( )

staticinherited

If any component has keyboard focus, this will defocus it.

◆ updateMouseCursor()

void juce::Component::updateMouseCursor ( ) const

inherited

Forces the current mouse cursor to be updated.

If you're overriding the getMouseCursor() method to control which cursor is displayed, then this will only be checked each time the user moves the mouse. So if you want to force the system to check that the cursor being displayed is up-to-date (even if the mouse is just sitting there), call this method.

(If you're changing the cursor using setMouseCursor(), you don't need to bother calling this).

◆ userTriedToCloseWindow()

virtual void juce::Component::userTriedToCloseWindow ( )

virtualinherited

For components on the desktop, this is called if the system wants to close the window.

This is a signal that either the user or the system wants the window to close. The default implementation of this method will trigger an assertion to warn you that your component should do something about it, but you can override this to ignore the event if you want.

Reimplemented in juce::AlertWindow.

◆ visibilityChanged()

virtual void juce::Component::visibilityChanged ( )

virtualinherited

Called when this component's visibility changes.

See also: setVisible, isVisible

Reimplemented in juce::ListBox, juce::Button, juce::ResizableWindow, juce::TopLevelWindow, juce::WebBrowserComponent, and juce::ProgressBar.

Member Data Documentation

◆ currentDetails

String juce::ImagePreviewComponent::currentDetails

private

◆ currentThumbnail

Image juce::ImagePreviewComponent::currentThumbnail

private

◆ fileToLoad

File juce::ImagePreviewComponent::fileToLoad

private

The documentation for this class was generated from the following file:

juce_ImagePreviewComponent.h

Public Types

Public Member Functions

Static Public Member Functions

Private Member Functions

Static Private Member Functions

Private Attributes

Detailed Description

Member Enumeration Documentation

◆ FocusChangeType

Constructor & Destructor Documentation

◆ ImagePreviewComponent()

◆ ~ImagePreviewComponent()

Member Function Documentation

◆ addAndMakeVisible() [1/2]

◆ addAndMakeVisible() [2/2]

◆ addChildAndSetID()

◆ addChildComponent() [1/2]

◆ addChildComponent() [2/2]

◆ addComponentListener()

◆ addKeyListener()

◆ addMouseListener()

◆ addToDesktop()

◆ alphaChanged()

◆ beginDragAutoRepeat()

◆ broughtToFront()

◆ callAfterDelay()

◆ callPendingTimersSynchronously()

◆ canModalEventBeSentToComponent()

◆ centreWithSize()

◆ childBoundsChanged()

◆ childrenChanged()

◆ colourChanged()

◆ contains()

◆ copyAllExplicitColoursTo()

◆ createComponentSnapshot()

◆ createFocusTraverser()

◆ deleteAllChildren()

◆ enablementChanged()

◆ enterModalState()

◆ exitModalState()

◆ findChildWithID()

◆ findColour()

◆ findParentComponentOfClass()

◆ focusGained()

◆ focusLost()

◆ focusOfChildComponentChanged()

◆ getAlpha()

◆ getBottom()

◆ getBounds()

◆ getBoundsInParent()

◆ getCachedComponentImage()

◆ getChildComponent()

◆ getChildren()

◆ getComponentAt() [1/2]

◆ getComponentAt() [2/2]

◆ getComponentEffect()

◆ getComponentID()

◆ getCurrentlyFocusedComponent()

◆ getCurrentlyModalComponent()

◆ getDesktopScaleFactor()

◆ getExplicitFocusOrder()

◆ getHeight()

◆ getIndexOfChildComponent()

◆ getInterceptsMouseClicks()

◆ getLocalArea()

◆ getLocalBounds()

◆ getLocalPoint() [1/2]

◆ getLocalPoint() [2/2]

◆ getLookAndFeel()

◆ getMouseClickGrabsKeyboardFocus()

◆ getMouseCursor()

◆ getMouseXYRelative()

◆ getName()

◆ getNumChildComponents()

◆ getNumCurrentlyModalComponents()

◆ getParentComponent()

◆ getParentHeight()

◆ getParentMonitorArea()

◆ getParentWidth()

◆ getPeer()