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- /*
- ==============================================================================
-
- This file is part of the JUCE library.
- Copyright (c) 2015 - ROLI Ltd.
-
- Permission is granted to use this software under the terms of either:
- a) the GPL v2 (or any later version)
- b) the Affero GPL v3
-
- Details of these licenses can be found at: www.gnu.org/licenses
-
- JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
- A PARTICULAR PURPOSE. See the GNU General Public License for more details.
-
- ------------------------------------------------------------------------------
-
- To release a closed-source product which uses JUCE, commercial licenses are
- available: visit www.juce.com for more information.
-
- ==============================================================================
- */
-
- #ifndef JUCE_CACHEDCOMPONENTIMAGE_H_INCLUDED
- #define JUCE_CACHEDCOMPONENTIMAGE_H_INCLUDED
-
-
- //==============================================================================
- /**
- 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 Component::setCachedComponentImage
- */
- class JUCE_API CachedComponentImage
- {
- public:
- CachedComponentImage() noexcept {}
- virtual ~CachedComponentImage() {}
-
- //==============================================================================
- /** 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 void paint (Graphics&) = 0;
-
- /** Invalidates all cached image data.
- @returns true if the peer should also be repainted, or false if this object
- handles all repaint work internally.
- */
- virtual bool invalidateAll() = 0;
-
- /** 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.
- */
- virtual bool invalidate (const Rectangle<int>& area) = 0;
-
- /** Called to indicate that the component is no longer active, so
- any cached data should be released if possible.
- */
- virtual void releaseResources() = 0;
- };
-
- #endif // JUCE_CACHEDCOMPONENTIMAGE_H_INCLUDED
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