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70 lines
2.5 KiB
70 lines
2.5 KiB
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2013 - Raw Material Software Ltd.
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Permission is granted to use this software under the terms of either:
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a) the GPL v2 (or any later version)
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b) the Affero GPL v3
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Details of these licenses can be found at: www.gnu.org/licenses
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.juce.com for more information.
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==============================================================================
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*/
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#ifndef JUCE_CACHEDCOMPONENTIMAGE_H_INCLUDED
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#define JUCE_CACHEDCOMPONENTIMAGE_H_INCLUDED
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//==============================================================================
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/**
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Base class used internally for structures that can store cached images of
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component state.
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Most people are unlikely to ever need to know about this class - it's really
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only for power-users!
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@see Component::setCachedComponentImage
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*/
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class JUCE_API CachedComponentImage
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{
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public:
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CachedComponentImage() noexcept {}
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virtual ~CachedComponentImage() {}
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//==============================================================================
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/** Called as part of the parent component's paint method, this must draw
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the given component into the target graphics context, using the cached
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version where possible.
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*/
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virtual void paint (Graphics&) = 0;
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/** Invalidates all cached image data.
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@returns true if the peer should also be repainted, or false if this object
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handles all repaint work internally.
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*/
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virtual bool invalidateAll() = 0;
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/** Invalidates a section of the cached image data.
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@returns true if the peer should also be repainted, or false if this object
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handles all repaint work internally.
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*/
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virtual bool invalidate (const Rectangle<int>& area) = 0;
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/** Called to indicate that the component is no longer active, so
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any cached data should be released if possible.
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*/
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virtual void releaseResources() = 0;
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};
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#endif // JUCE_CACHEDCOMPONENTIMAGE_H_INCLUDED
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