Gets informed about changes to a component's hierarchy or position. More...

#include <juce_ComponentListener.h>

Inheritance diagram for juce::ComponentListener:

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Public Member Functions
virtual	~ComponentListener ()=default
	Destructor. More...

virtual void	componentBeingDeleted (Component &component)
	Called when the component is in the process of being deleted. More...

virtual void	componentBroughtToFront (Component &component)
	Called when the component is brought to the top of the z-order. More...

virtual void	componentChildrenChanged (Component &component)
	Called when the component has children added or removed, or their z-order changes. More...

virtual void	componentEnablementChanged (Component &component)

virtual void	componentMovedOrResized (Component &component, bool wasMoved, bool wasResized)
	Called when the component's position or size changes. More...

virtual void	componentNameChanged (Component &component)
	Called when the component's name is changed. More...

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

virtual void	componentVisibilityChanged (Component &component)
	Called when the component is made visible or invisible. More...

Detailed Description

Gets informed about changes to a component's hierarchy or position.

To monitor a component for changes, register a subclass of ComponentListener with the component using Component::addComponentListener().

Be sure to deregister listeners before you delete them!

See also: Component::addComponentListener, Component::removeComponentListener

@tags{GUI}

Constructor & Destructor Documentation

◆ ~ComponentListener()

virtual juce::ComponentListener::~ComponentListener ( )

virtualdefault

Destructor.

Member Function Documentation

◆ componentBeingDeleted()

virtual void juce::ComponentListener::componentBeingDeleted ( Component & component )

virtual

Called when the component is in the process of being deleted.

This callback is made from inside the destructor, so be very, very cautious about what you do in here.

In particular, bear in mind that it's the Component base class's destructor that calls this - so if the object that's being deleted is a subclass of Component, then the subclass layers of the object will already have been destructed when it gets to this point!

Parameters

component the component that was deleted

Reimplemented in juce::ComponentMovementWatcher, and juce::RelativeCoordinatePositionerBase.

◆ componentBroughtToFront()

virtual void juce::ComponentListener::componentBroughtToFront ( Component & component )

virtual

Called when the component is brought to the top of the z-order.

Parameters

component the component that was moved

See also: Component::toFront, Component::broughtToFront

Reimplemented in juce::FocusOutline, and juce::DropShadower.

◆ componentChildrenChanged()

virtual void juce::ComponentListener::componentChildrenChanged ( Component & component )

virtual

Called when the component has children added or removed, or their z-order changes.

Parameters

component the component whose children have changed

See also: Component::childrenChanged, Component::addChildComponent, Component::removeChildComponent

Reimplemented in juce::DropShadower, and juce::RelativeCoordinatePositionerBase.

◆ componentEnablementChanged()

virtual void juce::ComponentListener::componentEnablementChanged ( Component & component )

virtual

◆ componentMovedOrResized()

virtual void juce::ComponentListener::componentMovedOrResized	(	Component &	component,
		bool	wasMoved,
		bool	wasResized
	)

virtual

Called when the component's position or size changes.

Parameters

component	the component that was moved or resized
wasMoved	true if the component's top-left corner has just moved
wasResized	true if the component's width or height has just changed

See also: Component::setBounds, Component::resized, Component::moved

Reimplemented in juce::CarbonViewWrapperComponent, juce::StandaloneFilterWindow::MainContentComponent, juce::FocusOutline, juce::DropShadower, juce::RelativeCoordinatePositionerBase, juce::AudioProcessorEditor::AudioProcessorEditorListener, juce::Viewport, juce::Label, juce::SidePanel, and juce::ComponentMovementWatcher.

◆ componentNameChanged()

virtual void juce::ComponentListener::componentNameChanged ( Component & component )

virtual

Called when the component's name is changed.

Parameters

component the component that had its name changed

See also: Component::setName, Component::getName

Reimplemented in juce::MultiDocumentPanel.

◆ componentParentHierarchyChanged()

virtual void juce::ComponentListener::componentParentHierarchyChanged ( Component & component )

virtual

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

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

Parameters

component the component that this listener is registered with