CachedComponentImage Class Reference

Base class used internally for structures that can store cached images of component state. More...

Public Member Functions
	CachedComponentImage ()=default
virtual	~CachedComponentImage ()=default
virtual void	paint (Graphics &)=0
	Called as part of the parent component's paint method, this must draw the given component into the target graphics context, using the cached version where possible.
virtual bool	invalidateAll ()=0
	Invalidates all cached image data.
virtual bool	invalidate (const Rectangle< int > &area)=0
	Invalidates a section of the cached image data.
virtual void	releaseResources ()=0
	Called to indicate that the component is no longer active, so any cached data should be released if possible.

Detailed Description

Base class used internally for structures that can store cached images of component state.

Most people are unlikely to ever need to know about this class - it's really only for power-users!

See also

Component::setCachedComponentImage

Constructor & Destructor Documentation

CachedComponentImage()

CachedComponentImage::CachedComponentImage ( )

default

~CachedComponentImage()

virtual CachedComponentImage::~CachedComponentImage ( )

virtualdefault

Member Function Documentation

paint()

virtual void CachedComponentImage::paint ( Graphics & )

pure virtual

Called as part of the parent component's paint method, this must draw the given component into the target graphics context, using the cached version where possible.

invalidateAll()

virtual bool CachedComponentImage::invalidateAll ( )

pure virtual

Invalidates all cached image data.

Returns

true if the peer should also be repainted, or false if this object handles all repaint work internally.

invalidate()

virtual bool CachedComponentImage::invalidate ( const Rectangle< int > & area )

pure virtual

Invalidates a section of the cached image data.

Returns

true if the peer should also be repainted, or false if this object handles all repaint work internally.

releaseResources()

virtual void CachedComponentImage::releaseResources ( )

pure virtual

Called to indicate that the component is no longer active, so any cached data should be released if possible.