KeyboardFocusTraverser Class Reference

Controls the order in which keyboard focus moves between components. More...

Inheritance diagram for KeyboardFocusTraverser:

Public Member Functions
	~KeyboardFocusTraverser () override=default
	Destructor.
Component *	getDefaultComponent (Component *parentComponent) override
	Returns the component that should receive keyboard focus by default within the given parent component.
Component *	getNextComponent (Component *current) override
	Returns the component that should be given keyboard focus after the specified one when moving "forwards".
Component *	getPreviousComponent (Component *current) override
	Returns the component that should be given keyboard focus after the specified one when moving "backwards".
std::vector< Component * >	getAllComponents (Component *parentComponent) override
	Returns all of the components that can receive keyboard focus within the given parent component in traversal order.
Public Member Functions inherited from ComponentTraverser
virtual	~ComponentTraverser ()=default
	Destructor.

Detailed Description

Controls the order in which keyboard focus moves between components.

The default behaviour of this class uses a FocusTraverser object internally to determine the default/next/previous component until it finds one which wants keyboard focus, as set by the Component::setWantsKeyboardFocus() method.

If you need keyboard focus traversal in a more customised way, you can create a subclass of ComponentTraverser that uses your own algorithm, and use Component::createKeyboardFocusTraverser() to create it.

See also

FocusTraverser, ComponentTraverser, Component::createKeyboardFocusTraverser

Constructor & Destructor Documentation

~KeyboardFocusTraverser()

KeyboardFocusTraverser::~KeyboardFocusTraverser ( )

overridedefault

Destructor.

Member Function Documentation

getDefaultComponent()

Component * KeyboardFocusTraverser::getDefaultComponent ( Component * parentComponent )

overridevirtual

Returns the component that should receive keyboard focus by default within the given parent component.

The default implementation will return the foremost focusable component (as determined by FocusTraverser) that also wants keyboard focus, or nullptr if there is no suitable component.

Implements ComponentTraverser.

getNextComponent()

Component * KeyboardFocusTraverser::getNextComponent ( Component * current )

overridevirtual

Returns the component that should be given keyboard focus after the specified one when moving "forwards".

The default implementation will return the next focusable component (as determined by FocusTraverser) that also wants keyboard focus, or nullptr if there is no suitable component.

Implements ComponentTraverser.

getPreviousComponent()

Component * KeyboardFocusTraverser::getPreviousComponent ( Component * current )

overridevirtual

Returns the component that should be given keyboard focus after the specified one when moving "backwards".

The default implementation will return the previous focusable component (as determined by FocusTraverser) that also wants keyboard focus, or nullptr if there is no suitable component.

Implements ComponentTraverser.

getAllComponents()

std::vector< Component * > KeyboardFocusTraverser::getAllComponents ( Component * parentComponent )

overridevirtual

Returns all of the components that can receive keyboard focus within the given parent component in traversal order.

The default implementation will return all focusable child components (as determined by FocusTraverser) that also wants keyboard focus.

Implements ComponentTraverser.