ImageButton Class Reference

As the title suggests, this is a button containing an image. More...

#include <juce_ImageButton.h>

Inheritance diagram for ImageButton:

Classes
struct	LookAndFeelMethods
	This abstract base class is implemented by LookAndFeel classes. More...

Public Member Functions
	ImageButton (const String &name=String())
	Creates an ImageButton.
	~ImageButton () override
	Destructor.
void	setImages (bool resizeButtonNowToFitThisImage, bool rescaleImagesWhenButtonSizeChanges, bool preserveImageProportions, const Image &normalImage, float imageOpacityWhenNormal, Colour overlayColourWhenNormal, const Image &overImage, float imageOpacityWhenOver, Colour overlayColourWhenOver, const Image &downImage, float imageOpacityWhenDown, Colour overlayColourWhenDown, float hitTestAlphaThreshold=0.0f)
	Sets up the images to draw in various states.
Image	getNormalImage () const
	Returns the currently set 'normal' image.
Image	getOverImage () const
	Returns the image that's drawn when the mouse is over the button.
Image	getDownImage () const
	Returns the image that's drawn when the button is held down.
Public Member Functions inherited from Button
	~Button () override
	Destructor.
void	setButtonText (const String &newText)
	Changes the button's text.
const String &	getButtonText () const
	Returns the text displayed in the button.
bool	isDown () const noexcept
	Returns true if the button is currently being held down.
bool	isOver () const noexcept
	Returns true if the mouse is currently over the button.
void	setToggleable (bool shouldBeToggleable)
	Indicates that the button's on/off state is toggleable.
bool	isToggleable () const noexcept
	Returns true if the button's on/off state is toggleable.
void	setToggleState (bool shouldBeOn, NotificationType notification)
	A button has an on/off state associated with it, and this changes that.
bool	getToggleState () const noexcept
	Returns true if the button is 'on'.
Value &	getToggleStateValue () noexcept
	Returns the Value object that represents the button's toggle state.
void	setClickingTogglesState (bool shouldAutoToggleOnClick) noexcept
	This tells the button to automatically flip the toggle state when the button is clicked.
bool	getClickingTogglesState () const noexcept
	Returns true if this button is set to be an automatic toggle-button.
void	setRadioGroupId (int newGroupId, NotificationType notification=sendNotification)
	Enables the button to act as a member of a mutually-exclusive group of 'radio buttons'.
int	getRadioGroupId () const noexcept
	Returns the ID of the group to which this button belongs.
void	addListener (Listener *newListener)
	Registers a listener to receive events when this button's state changes.
void	removeListener (Listener *listener)
	Removes a previously-registered button listener.
virtual void	triggerClick ()
	Causes the button to act as if it's been clicked.
void	setCommandToTrigger (ApplicationCommandManager *commandManagerToUse, CommandID commandID, bool generateTooltip)
	Sets a command ID for this button to automatically invoke when it's clicked.
CommandID	getCommandID () const noexcept
	Returns the command ID that was set by setCommandToTrigger().
void	addShortcut (const KeyPress &)
	Assigns a shortcut key to trigger the button.
void	clearShortcuts ()
	Removes all key shortcuts that had been set for this button.
bool	isRegisteredForShortcut (const KeyPress &) const
	Returns true if the given keypress is a shortcut for this button.
void	setRepeatSpeed (int initialDelayInMillisecs, int repeatDelayInMillisecs, int minimumDelayInMillisecs=-1) noexcept
	Sets an auto-repeat speed for the button when it is held down.
void	setTriggeredOnMouseDown (bool isTriggeredOnMouseDown) noexcept
	Sets whether the button click should happen when the mouse is pressed or released.
bool	getTriggeredOnMouseDown () const noexcept
	Returns whether the button click happens when the mouse is pressed or released.
uint32	getMillisecondsSinceButtonDown () const noexcept
	Returns the number of milliseconds since the last time the button went into the 'down' state.
void	setTooltip (const String &newTooltip) override
	Sets the tooltip for this button.
void	setConnectedEdges (int connectedEdgeFlags)
	Hints about which edges of the button might be connected to adjoining buttons.
int	getConnectedEdgeFlags () const noexcept
	Returns the set of flags passed into setConnectedEdges().
bool	isConnectedOnLeft () const noexcept
	Indicates whether the button adjoins another one on its left edge.
bool	isConnectedOnRight () const noexcept
	Indicates whether the button adjoins another one on its right edge.
bool	isConnectedOnTop () const noexcept
	Indicates whether the button adjoins another one on its top edge.
bool	isConnectedOnBottom () const noexcept
	Indicates whether the button adjoins another one on its bottom edge.
void	setState (ButtonState newState)
	Can be used to force the button into a particular state.
ButtonState	getState () const noexcept
	Returns the button's current over/down/up state.
Public Member Functions inherited from Component
	Component () noexcept
	Creates a component.
	~Component () override
	Destructor.
	Component (const String &componentName) noexcept
	Creates a component, setting its name at the same time.
String	getName () const noexcept
	Returns the name of this component.
virtual void	setName (const String &newName)
	Sets the name of this component.
String	getComponentID () const noexcept
	Returns the ID string that was set by setComponentID().
void	setComponentID (const String &newID)
	Sets the component's ID string.
virtual void	setVisible (bool shouldBeVisible)
	Makes the component visible or invisible.
bool	isVisible () const noexcept
	Tests whether the component is visible or not.
bool	isShowing () const
	Tests whether this component and all its parents are visible.
virtual void	addToDesktop (int windowStyleFlags, void *nativeWindowToAttachTo=nullptr)
	Makes this component appear as a window on the desktop.
void	removeFromDesktop ()
	If the component is currently showing on the desktop, this will hide it.
bool	isOnDesktop () const noexcept
	Returns true if this component is currently showing on the desktop.
ComponentPeer *	getPeer () const
	Returns the heavyweight window that contains this component.
virtual void	userTriedToCloseWindow ()
	For components on the desktop, this is called if the system wants to close the window.
virtual void	minimisationStateChanged (bool isNowMinimised)
	Called for a desktop component which has just been minimised or un-minimised.
virtual float	getDesktopScaleFactor () const
	Returns the default scale factor to use for this component when it is placed on the desktop.
void	toFront (bool shouldAlsoGainKeyboardFocus)
	Brings the component to the front of its siblings.
void	toBack ()
	Changes this component's z-order to be at the back of all its siblings.
void	toBehind (Component *other)
	Changes this component's z-order so that it's just behind another component.
void	setAlwaysOnTop (bool shouldStayOnTop)
	Sets whether the component should always be kept at the front of its siblings.
bool	isAlwaysOnTop () const noexcept
	Returns true if this component is set to always stay in front of its siblings.
int	getX () const noexcept
	Returns the x coordinate of the component's left edge.
int	getY () const noexcept
	Returns the y coordinate of the top of this component.
int	getWidth () const noexcept
	Returns the component's width in pixels.
int	getHeight () const noexcept
	Returns the component's height in pixels.
int	getRight () const noexcept
	Returns the x coordinate of the component's right-hand edge.
Point< int >	getPosition () const noexcept
	Returns the component's top-left position as a Point.
int	getBottom () const noexcept
	Returns the y coordinate of the bottom edge of this component.
Rectangle< int >	getBounds () const noexcept
	Returns this component's bounding box.
Rectangle< int >	getLocalBounds () const noexcept
	Returns the component's bounds, relative to its own origin.
Rectangle< int >	getBoundsInParent () const noexcept
	Returns the area of this component's parent which this component covers.
int	getScreenX () const
	Returns this component's x coordinate relative the screen's top-left origin.
int	getScreenY () const
	Returns this component's y coordinate relative the screen's top-left origin.
Point< int >	getScreenPosition () const
	Returns the position of this component's top-left corner relative to the screen's top-left.
Rectangle< int >	getScreenBounds () const
	Returns the bounds of this component, relative to the screen's top-left.
Point< int >	getLocalPoint (const Component *sourceComponent, Point< int > pointRelativeToSourceComponent) const
	Converts a point to be relative to this component's coordinate space.
Point< float >	getLocalPoint (const Component *sourceComponent, Point< float > pointRelativeToSourceComponent) const
	Converts a point to be relative to this component's coordinate space.
Rectangle< int >	getLocalArea (const Component *sourceComponent, Rectangle< int > areaRelativeToSourceComponent) const
	Converts a rectangle to be relative to this component's coordinate space.
Rectangle< float >	getLocalArea (const Component *sourceComponent, Rectangle< float > areaRelativeToSourceComponent) const
	Converts a rectangle to be relative to this component's coordinate space.
Point< int >	localPointToGlobal (Point< int > localPoint) const
	Converts a point relative to this component's top-left into a screen coordinate.
Point< float >	localPointToGlobal (Point< float > localPoint) const
	Converts a point relative to this component's top-left into a screen coordinate.
Rectangle< int >	localAreaToGlobal (Rectangle< int > localArea) const
	Converts a rectangle from this component's coordinate space to a screen coordinate.
Rectangle< float >	localAreaToGlobal (Rectangle< float > localArea) const
	Converts a rectangle from this component's coordinate space to a screen coordinate.
void	setTopLeftPosition (int x, int y)
	Moves the component to a new position.
void	setTopLeftPosition (Point< int > newTopLeftPosition)
	Moves the component to a new position.
void	setTopRightPosition (int x, int y)
	Moves the component to a new position.
void	setSize (int newWidth, int newHeight)
	Changes the size of the component.
void	setBounds (int x, int y, int width, int height)
	Changes the component's position and size.
void	setBounds (Rectangle< int > newBounds)
	Changes the component's position and size.
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.
void	setBoundsRelative (Rectangle< float > proportionalArea)
	Changes the component's position and size in terms of fractions of its parent's size.
void	setBoundsInset (BorderSize< int > borders)
	Changes the component's position and size based on the amount of space to leave around it.
void	setBoundsToFit (Rectangle< int > targetArea, Justification justification, bool onlyReduceInSize)
	Positions the component within a given rectangle, keeping its proportions unchanged.
void	setCentrePosition (int x, int y)
	Changes the position of the component's centre.
void	setCentrePosition (Point< int > newCentrePosition)
	Changes the position of the component's centre.
void	setCentreRelative (float x, float y)
	Changes the position of the component's centre.
void	centreWithSize (int width, int height)
	Changes the component's size and centres it within its parent.
void	setTransform (const AffineTransform &transform)
	Sets a transform matrix to be applied to this component.
AffineTransform	getTransform () const
	Returns the transform that is currently being applied to this component.
bool	isTransformed () const noexcept
	Returns true if a non-identity transform is being applied to this component.
int	proportionOfWidth (float proportion) const noexcept
	Returns a proportion of the component's width.
int	proportionOfHeight (float proportion) const noexcept
	Returns a proportion of the component's height.
int	getParentWidth () const noexcept
	Returns the width of the component's parent.
int	getParentHeight () const noexcept
	Returns the height of the component's parent.
Rectangle< int >	getParentMonitorArea () const
	Returns the screen coordinates of the monitor that contains this component.
int	getNumChildComponents () const noexcept
	Returns the number of child components that this component contains.
Component *	getChildComponent (int index) const noexcept
	Returns one of this component's child components, by it index.
int	getIndexOfChildComponent (const Component *child) const noexcept
	Returns the index of this component in the list of child components.
const Array< Component * > &	getChildren () const noexcept
	Provides access to the underlying array of child components.
Component *	findChildWithID (StringRef componentID) const noexcept
	Looks for a child component with the specified ID.
void	addChildComponent (Component *child, int zOrder=-1)
	Adds a child component to this one.
void	addChildComponent (Component &child, int zOrder=-1)
	Adds a child component to this one.
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.
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.
void	addChildAndSetID (Component *child, const String &componentID)
	Adds a child component to this one, makes it visible, and sets its component ID.
void	removeChildComponent (Component *childToRemove)
	Removes one of this component's child-components.
Component *	removeChildComponent (int childIndexToRemove)
	Removes one of this component's child-components by index.
void	removeAllChildren ()
	Removes all this component's children.
void	deleteAllChildren ()
	Removes and deletes all of this component's children.
Component *	getParentComponent () const noexcept
	Returns the component which this component is inside.
template<class TargetClass >
TargetClass *	findParentComponentOfClass () const
	Searches the parent components for a component of a specified class.
Component *	getTopLevelComponent () const noexcept
	Returns the highest-level component which contains this one or its parents.
bool	isParentOf (const Component *possibleChild) const noexcept
	Checks whether a component is anywhere inside this component or its children.
virtual void	childrenChanged ()
	Subclasses can use this callback to be told when children are added or removed, or when their z-order changes.
virtual WindowControlKind	findControlAtPoint (Point< float >) const
	For components that are added to the desktop, this may be called to determine what kind of control is at particular locations in the window.
virtual void	windowControlClickedClose ()
	For components that are added to the desktop, this may be called to indicate that the mouse was clicked inside the area of the "close" control.
virtual void	windowControlClickedMinimise ()
	For components that are added to the desktop, this may be called to indicate that the mouse was clicked inside the area of the "minimise" control.
virtual void	windowControlClickedMaximise ()
	For components that are added to the desktop, this may be called to indicate that the mouse was clicked inside the area of the "maximise" control.
void	setInterceptsMouseClicks (bool allowClicksOnThisComponent, bool allowClicksOnChildComponents) noexcept
	Changes the default return value for the hitTest() method.
void	getInterceptsMouseClicks (bool &allowsClicksOnThisComponent, bool &allowsClicksOnChildComponents) const noexcept
	Retrieves the current state of the mouse-click interception flags.
bool	contains (Point< int > localPoint)
	Returns true if a given point lies within this component or one of its children.
bool	contains (Point< float > localPoint)
	Returns true if a given point lies within this component or one of its children.
bool	reallyContains (Point< int > localPoint, bool returnTrueIfWithinAChild)
	Returns true if a given point lies in this component, taking any overlapping siblings into account.
bool	reallyContains (Point< float > localPoint, bool returnTrueIfWithinAChild)
	Returns true if a given point lies in this component, taking any overlapping siblings into account.
Component *	getComponentAt (int x, int y)
	Returns the component at a certain point within this one.
Component *	getComponentAt (Point< int > position)
	Returns the component at a certain point within this one.
Component *	getComponentAt (Point< float > position)
	Returns the component at a certain point within this one.
void	repaint ()
	Marks the whole component as needing to be redrawn.
void	repaint (int x, int y, int width, int height)
	Marks a subsection of this component as needing to be redrawn.
void	repaint (Rectangle< int > area)
	Marks a subsection of this component as needing to be redrawn.
void	setBufferedToImage (bool shouldBeBuffered)
	Makes the component use an internal buffer to optimise its redrawing.
Image	createComponentSnapshot (Rectangle< int > areaToGrab, bool clipImageToComponentBounds=true, float scaleFactor=1.0f)
	Generates a snapshot of part of this component.
void	paintEntireComponent (Graphics &context, bool ignoreAlphaLevel)
	Draws this component and all its subcomponents onto the specified graphics context.
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.
bool	isPaintingUnclipped () const noexcept
	Returns true if this component doesn't require its graphics context to be clipped when it is being painted.
void	setComponentEffect (ImageEffectFilter *newEffect)
	Adds an effect filter to alter the component's appearance.
ImageEffectFilter *	getComponentEffect () const noexcept
	Returns the current component effect.
LookAndFeel &	getLookAndFeel () const noexcept
	Finds the appropriate look-and-feel to use for this component.
void	setLookAndFeel (LookAndFeel *newLookAndFeel)
	Sets the look and feel to use for this component.
FontOptions	withDefaultMetrics (FontOptions opt) const
	Returns a copy of the FontOptions with the default metrics kind from the component's LookAndFeel.
virtual void	lookAndFeelChanged ()
	Called to let the component react to a change in the look-and-feel setting.
void	sendLookAndFeelChange ()
	Calls the methods repaint(), lookAndFeelChanged(), and colourChanged() in this component and all its children recursively.
void	setOpaque (bool shouldBeOpaque)
	Indicates whether any parts of the component might be transparent.
bool	isOpaque () const noexcept
	Returns true if no parts of this component are transparent.
void	setBroughtToFrontOnMouseClick (bool shouldBeBroughtToFront) noexcept
	Indicates whether the component should be brought to the front when clicked.
bool	isBroughtToFrontOnMouseClick () const noexcept
	Indicates whether the component should be brought to the front when clicked-on.
void	setExplicitFocusOrder (int newFocusOrderIndex)
	Sets the focus order of this component.
int	getExplicitFocusOrder () const
	Returns the focus order of this component, if one has been specified.
void	setFocusContainerType (FocusContainerType containerType) noexcept
	Sets whether this component is a container for components that can have their focus traversed, and the type of focus traversal that it supports.
bool	isFocusContainer () const noexcept
	Returns true if this component has been marked as a focus container.
bool	isKeyboardFocusContainer () const noexcept
	Returns true if this component has been marked as a keyboard focus container.
Component *	findFocusContainer () const
	Returns the focus container for this component.
Component *	findKeyboardFocusContainer () const
	Returns the keyboard focus container for this component.
void	setWantsKeyboardFocus (bool wantsFocus) noexcept
	Sets a flag to indicate whether this component wants keyboard focus or not.
bool	getWantsKeyboardFocus () const noexcept
	Returns true if the component is interested in getting keyboard focus.
void	setMouseClickGrabsKeyboardFocus (bool shouldGrabFocus)
	Chooses whether a click on this component automatically grabs the focus.
bool	getMouseClickGrabsKeyboardFocus () const noexcept
	Returns the last value set with setMouseClickGrabsKeyboardFocus().
void	grabKeyboardFocus ()
	Tries to give keyboard focus to this component.
void	giveAwayKeyboardFocus ()
	If this component or any of its children currently have the keyboard focus, this will defocus it, send a focus change notification, and try to pass the focus to the next component.
bool	hasKeyboardFocus (bool trueIfChildIsFocused) const
	Returns true if this component currently has the keyboard focus.
void	moveKeyboardFocusToSibling (bool moveToNext)
	Tries to move the keyboard focus to one of this component's siblings.
virtual std::unique_ptr< ComponentTraverser >	createFocusTraverser ()
	Creates a ComponentTraverser object to determine the logic by which focus should be passed from this component.
virtual std::unique_ptr< ComponentTraverser >	createKeyboardFocusTraverser ()
	Creates a ComponentTraverser object to use to determine the logic by which keyboard focus should be passed from this component.
void	setHasFocusOutline (bool hasFocusOutline) noexcept
	Use this to indicate that the component should have an outline drawn around it when it has keyboard focus.
bool	hasFocusOutline () const noexcept
	Returns true if this component should have a focus outline.
bool	isEnabled () const noexcept
	Returns true if the component (and all its parents) are enabled.
void	setEnabled (bool shouldBeEnabled)
	Enables or disables this component.
float	getAlpha () const noexcept
	Returns the component's current transparency level.
void	setAlpha (float newAlpha)
	Changes the transparency of this component.
virtual void	alphaChanged ()
	Called when setAlpha() is used to change the alpha value of this component.
void	setMouseCursor (const MouseCursor &cursorType)
	Changes the mouse cursor shape to use when the mouse is over this component.
virtual MouseCursor	getMouseCursor ()
	Returns the mouse cursor shape to use when the mouse is over this component.
void	updateMouseCursor () const
	Forces the current mouse cursor to be updated.
virtual void	paintOverChildren (Graphics &g)
	Components can override this method to draw over the top of their children.
void	mouseMove (const MouseEvent &event) override
	Called when the mouse moves inside a component.
void	mouseEnter (const MouseEvent &event) override
	Called when the mouse first enters a component.
void	mouseExit (const MouseEvent &event) override
	Called when the mouse moves out of a component.
void	mouseDown (const MouseEvent &event) override
	Called when a mouse button is pressed.
void	mouseDrag (const MouseEvent &event) override
	Called when the mouse is moved while a button is held down.
void	mouseUp (const MouseEvent &event) override
	Called when a mouse button is released.
void	mouseDoubleClick (const MouseEvent &event) override
	Called when a mouse button has been double-clicked on a component.
void	mouseWheelMove (const MouseEvent &event, const MouseWheelDetails &wheel) override
	Called when the mouse-wheel is moved.
void	mouseMagnify (const MouseEvent &event, float scaleFactor) override
	Called when a pinch-to-zoom mouse-gesture is used.
void	setRepaintsOnMouseActivity (bool shouldRepaint) noexcept
	Causes automatic repaints when the mouse enters or exits this component.
void	addMouseListener (MouseListener *newListener, bool wantsEventsForAllNestedChildComponents)
	Registers a listener to be told when mouse events occur in this component.
void	removeMouseListener (MouseListener *listenerToRemove)
	Deregisters a mouse listener.
void	addKeyListener (KeyListener *newListener)
	Adds a listener that wants to hear about keypresses that this component receives.
void	removeKeyListener (KeyListener *listenerToRemove)
	Removes a previously-registered key listener.
virtual void	modifierKeysChanged (const ModifierKeys &modifiers)
	Called when a modifier key is pressed or released.
virtual void	focusGainedWithDirection (FocusChangeType cause, FocusChangeDirection direction)
	Called to indicate that this component has just acquired the keyboard focus.
virtual void	focusOfChildComponentChanged (FocusChangeType cause)
	Called to indicate a change in whether or not this component is the parent of the currently-focused component.
bool	isMouseOver (bool includeChildren=false) const
	Returns true if the mouse is currently over this component.
bool	isMouseButtonDown (bool includeChildren=false) const
	Returns true if the mouse button is currently held down in this component.
bool	isMouseOverOrDragging (bool includeChildren=false) const
	True if the mouse is over this component, or if it's being dragged in this component.
Point< int >	getMouseXYRelative () const
	Returns the mouse's current position, relative to this component.
virtual void	resized ()
	Called when this component's size has been changed.
virtual void	moved ()
	Called when this component's position has been changed.
virtual void	childBoundsChanged (Component *child)
	Called when one of this component's children is moved or resized.
virtual void	parentSizeChanged ()
	Called when this component's immediate parent has been resized.
virtual void	broughtToFront ()
	Called when this component has been moved to the front of its siblings.
void	addComponentListener (ComponentListener *newListener)
	Adds a listener to be told about changes to the component hierarchy or position.
void	removeComponentListener (ComponentListener *listenerToRemove)
	Removes a component listener.
void	postCommandMessage (int commandId)
	Dispatches a numbered message to this component.
int	runModalLoop ()
	Runs a component modally, waiting until the loop terminates.
void	enterModalState (bool takeKeyboardFocus=true, ModalComponentManager::Callback *callback=nullptr, bool deleteWhenDismissed=false)
	Puts the component into a modal state.
void	exitModalState (int returnValue=0)
	Ends a component's modal state.
bool	isCurrentlyModal (bool onlyConsiderForemostModalComponent=true) const noexcept
	Returns true if this component is the modal one.
bool	isCurrentlyBlockedByAnotherModalComponent () const
	Checks whether there's a modal component somewhere that's stopping this one from receiving messages.
virtual bool	canModalEventBeSentToComponent (const Component *targetComponent)
	When a component is modal, this callback allows it to choose which other components can still receive events.
virtual void	inputAttemptWhenModal ()
	Called when the user tries to click on a component that is blocked by another modal component.
NamedValueSet &	getProperties () noexcept
	Returns the set of properties that belong to this component.
const NamedValueSet &	getProperties () const noexcept
	Returns the set of properties that belong to this component.
Colour	findColour (int colourID, bool inheritFromParent=false) const
	Looks for a colour that has been registered with the given colour ID number.
void	setColour (int colourID, Colour newColour)
	Registers a colour to be used for a particular purpose.
void	removeColour (int colourID)
	If a colour has been set with setColour(), this will remove it.
bool	isColourSpecified (int colourID) const
	Returns true if the specified colour ID has been explicitly set for this component using the setColour() method.
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.
virtual void	colourChanged ()
	This method is called when a colour is changed by the setColour() method, or when the look-and-feel is changed by the setLookAndFeel() or sendLookAndFeelChanged() methods.
void *	getWindowHandle () const
	Returns the underlying native window handle for this component.
Positioner *	getPositioner () const noexcept
	Returns the Positioner object that has been set for this component.
void	setPositioner (Positioner *newPositioner)
	Sets a new Positioner object for this component.
void	setCachedComponentImage (CachedComponentImage *newCachedImage)
	Gives the component a CachedComponentImage that should be used to buffer its painting.
CachedComponentImage *	getCachedComponentImage () const noexcept
	Returns the object that was set by setCachedComponentImage().
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.
bool	getViewportIgnoreDragFlag () const noexcept
	Retrieves the current state of the Viewport drag-to-scroll functionality flag.
String	getTitle () const noexcept
	Returns the title text for this component.
void	setTitle (const String &newTitle)
	Sets the title for this component.
String	getDescription () const noexcept
	Returns the description for this component.
void	setDescription (const String &newDescription)
	Sets the description for this component.
String	getHelpText () const noexcept
	Returns the help text for this component.
void	setHelpText (const String &newHelpText)
	Sets the help text for this component.
void	setAccessible (bool shouldBeAccessible)
	Sets whether this component and its children are visible to accessibility clients.
bool	isAccessible () const noexcept
	Returns true if this component and its children are visible to accessibility clients.
AccessibilityHandler *	getAccessibilityHandler ()
	Returns the accessibility handler for this component, or nullptr if this component is not accessible.
void	invalidateAccessibilityHandler ()
	Invalidates the AccessibilityHandler that is currently being used for this component.
Public Member Functions inherited from MouseListener
virtual	~MouseListener ()=default
	Destructor.
Public Member Functions inherited from SettableTooltipClient
	~SettableTooltipClient () override=default
	Destructor.
String	getTooltip () override
	Returns the tooltip assigned to this object.
Public Member Functions inherited from TooltipClient
virtual	~TooltipClient ()=default
	Destructor.

Protected Member Functions
bool	hitTest (int x, int y) override
	Tests whether a given point is inside the component.
void	paintButton (Graphics &, bool, bool) override
	Subclasses should override this to actually paint the button's contents.
Protected Member Functions inherited from Button
	Button (const String &buttonName)
	Creates a button.
virtual void	clicked ()
	This method is called when the button has been clicked.
virtual void	clicked (const ModifierKeys &modifiers)
	This method is called when the button has been clicked.
virtual void	buttonStateChanged ()
	Called when the button's up/down/over state changes.
virtual void	internalClickCallback (const ModifierKeys &)
void	handleCommandMessage (int commandId) override
	Called to handle a command that was sent by postCommandMessage().
void	mouseEnter (const MouseEvent &) override
	Called when the mouse first enters a component.
void	mouseExit (const MouseEvent &) override
	Called when the mouse moves out of a component.
void	mouseDown (const MouseEvent &) override
	Called when a mouse button is pressed.
void	mouseDrag (const MouseEvent &) override
	Called when the mouse is moved while a button is held down.
void	mouseUp (const MouseEvent &) override
	Called when a mouse button is released.
bool	keyPressed (const KeyPress &) override
	Called when a key is pressed.
void	paint (Graphics &) override
	Components can override this method to draw their content.
void	parentHierarchyChanged () override
	Called to indicate that the component's parents have changed.
void	visibilityChanged () override
	Called when this component's visibility changes.
void	focusGained (FocusChangeType) override
	Called to indicate that this component has just acquired the keyboard focus.
void	focusLost (FocusChangeType) override
	Called to indicate that this component has just lost the keyboard focus.
void	enablementChanged () override
	Callback to indicate that this component has been enabled or disabled.
std::unique_ptr< AccessibilityHandler >	createAccessibilityHandler () override
	Override this method to return a custom AccessibilityHandler for this component.
virtual bool	keyStateChanged (bool isKeyDown)
	Called when a key is pressed or released.
Protected Member Functions inherited from SettableTooltipClient
	SettableTooltipClient ()=default

Additional Inherited Members
Public Types inherited from Button
enum	ConnectedEdgeFlags { ConnectedOnLeft = 1 , ConnectedOnRight = 2 , ConnectedOnTop = 4 , ConnectedOnBottom = 8 }
	A combination of these flags are used by setConnectedEdges(). More...
enum	ButtonState { buttonNormal , buttonOver , buttonDown }
	Used by setState(). More...
Public Types inherited from Component
enum class	WindowControlKind {   client , caption , minimise , maximise ,   close , sizeTop , sizeLeft , sizeRight ,   sizeBottom , sizeTopLeft , sizeTopRight , sizeBottomLeft ,   sizeBottomRight }
	Types of control that are commonly found in windows, especially title-bars. More...
enum class	FocusContainerType { none , focusContainer , keyboardFocusContainer }
	A focus container type that can be passed to setFocusContainerType(). More...
enum	FocusChangeType { focusChangedByMouseClick , focusChangedByTabKey , focusChangedDirectly }
	Enumeration used by the focusGained() and focusLost() methods. More...
enum class	FocusChangeDirection { unknown , forward , backward }
	Enumeration used by the focusGainedWithDirection() method. More...
Static Public Member Functions inherited from Component
static float JUCE_CALLTYPE	getApproximateScaleFactorForComponent (const Component *targetComponent)
	Returns the approximate scale factor for a given component by traversing its parent hierarchy and applying each transform and finally scaling this by the global scale factor.
static Component *JUCE_CALLTYPE	getCurrentlyFocusedComponent () noexcept
	Returns the component that currently has the keyboard focus.
static void JUCE_CALLTYPE	unfocusAllComponents ()
	If any component has keyboard focus, this will defocus it.
static void JUCE_CALLTYPE	beginDragAutoRepeat (int millisecondsBetweenCallbacks)
	Ensures that a non-stop stream of mouse-drag events will be sent during the current mouse-drag operation.
static bool JUCE_CALLTYPE	isMouseButtonDownAnywhere () noexcept
	Returns true if a mouse button is currently down.
static int JUCE_CALLTYPE	getNumCurrentlyModalComponents () noexcept
	Returns the number of components that are currently in a modal state.
static Component *JUCE_CALLTYPE	getCurrentlyModalComponent (int index=0) noexcept
	Returns one of the components that are currently modal.
Public Attributes inherited from Button
std::function< void()>	onClick
	You can assign a lambda to this callback object to have it called when the button is clicked.
std::function< void()>	onStateChange
	You can assign a lambda to this callback object to have it called when the button's state changes.

Detailed Description

As the title suggests, this is a button containing an image.

The colour and transparency of the image can be set to vary when the button state changes.

See also

Button, ShapeButton, TextButton

Constructor & Destructor Documentation

ImageButton()

ImageButton::ImageButton ( const String & name = String() )

explicit

Creates an ImageButton.

Use setImage() to specify the image to use. The colours and opacities that are specified here can be changed later using setImages().

Parameters

name	the name to give the component

~ImageButton()

ImageButton::~ImageButton ( )

override

Destructor.

Member Function Documentation

setImages()

void ImageButton::setImages	(	bool	resizeButtonNowToFitThisImage,
		bool	rescaleImagesWhenButtonSizeChanges,
		bool	preserveImageProportions,
		const Image &	normalImage,
		float	imageOpacityWhenNormal,
		Colour	overlayColourWhenNormal,
		const Image &	overImage,
		float	imageOpacityWhenOver,
		Colour	overlayColourWhenOver,
		const Image &	downImage,
		float	imageOpacityWhenDown,
		Colour	overlayColourWhenDown,
		float	hitTestAlphaThreshold = 0.0f )

Sets up the images to draw in various states.

Parameters

resizeButtonNowToFitThisImage	if true, the button will be immediately resized to the same dimensions as the normal image
rescaleImagesWhenButtonSizeChanges	if true, the image will be rescaled to fit the button when the button's size changes
preserveImageProportions	if true then any rescaling of the image to fit the button will keep the image's x and y proportions correct - i.e. it won't distort its shape, although this might create gaps around the edges
normalImage	the image to use when the button is in its normal state. button no longer needs it.
imageOpacityWhenNormal	the opacity to use when drawing the normal image.
overlayColourWhenNormal	an overlay colour to use to fill the alpha channel of the normal image - if this colour is transparent, no overlay will be drawn. The overlay will be drawn over the top of the image, so you can basically add a solid or semi-transparent colour to the image to brighten or darken it
overImage	the image to use when the mouse is over the button. If you want to use the same image as was set in the normalImage parameter, this value can be a null image.
imageOpacityWhenOver	the opacity to use when drawing the image when the mouse is over the button
overlayColourWhenOver	an overlay colour to use to fill the alpha channel of the image when the mouse is over - if this colour is transparent, no overlay will be drawn
downImage	an image to use when the button is pressed down. If set to a null image, the 'over' image will be drawn instead (or the normal image if there isn't an 'over' image either).
imageOpacityWhenDown	the opacity to use when drawing the image when the button is pressed
overlayColourWhenDown	an overlay colour to use to fill the alpha channel of the image when the button is pressed down - if this colour is transparent, no overlay will be drawn
hitTestAlphaThreshold	if set to zero, the mouse is considered to be over the button whenever it's inside the button's bounding rectangle. If set to values higher than 0, the mouse will only be considered to be over the image when the value of the image's alpha channel at that position is greater than this level.

getNormalImage()

Image ImageButton::getNormalImage

(

)

const

Returns the currently set 'normal' image.

getOverImage()

Image ImageButton::getOverImage

(

)

const

Returns the image that's drawn when the mouse is over the button.

If a valid 'over' image has been set, this will return it; otherwise it'll just return the normal image.

getDownImage()

Image ImageButton::getDownImage

(

)

const

Returns the image that's drawn when the button is held down.

If a valid 'down' image has been set, this will return it; otherwise it'll return the 'over' image or normal image, depending on what's available.

hitTest()

bool ImageButton::hitTest ( int x, int y )

overrideprotectedvirtual

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 'client' or 'none', depending on the value that was set by calling setInterceptsMouseClicks() ('client' 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 from Component.

paintButton()

void ImageButton::paintButton ( Graphics & g, bool shouldDrawButtonAsHighlighted, bool shouldDrawButtonAsDown )

overrideprotectedvirtual

Subclasses should override this to actually paint the button's contents.

It's better to use this than the paint method, because it gives you information about the over/down state of the button.

Parameters

g	the graphics context to use
shouldDrawButtonAsHighlighted	true if the button is either in the 'over' or 'down' state
shouldDrawButtonAsDown	true if the button should be drawn in the 'down' position

Implements Button.

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

• juce_ImageButton.h