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73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2022 - Raw Material Software Limited
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 7 End-User License
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Agreement and JUCE Privacy Policy.
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End User License Agreement: www.juce.com/juce-7-licence
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Privacy Policy: www.juce.com/juce-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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/** Helper class to synchronise Component updates to the vertical blank event of the display that
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the Component is presented on. This is useful when animating the Component's contents.
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*/
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class JUCE_API VBlankAttachment final : public ComponentPeer::VBlankListener,
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public ComponentListener
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{
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public:
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/** Default constructor for creating an empty object. */
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VBlankAttachment() = default;
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/** Constructor. Creates an attachment that will call the passed in function at every vertical
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blank event of the display that the passed in Component is currently visible on.
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The Component must be valid for the entire lifetime of the VBlankAttachment.
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*/
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VBlankAttachment (Component* c, std::function<void()> callbackIn);
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VBlankAttachment (VBlankAttachment&& other);
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VBlankAttachment& operator= (VBlankAttachment&& other);
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/** Destructor. */
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~VBlankAttachment() override;
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/** Returns true for a default constructed object. */
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bool isEmpty() const { return owner == nullptr; }
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//==============================================================================
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void onVBlank() override;
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//==============================================================================
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void componentParentHierarchyChanged (Component&) override;
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private:
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void updateOwner();
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void updatePeer();
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void cleanup();
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Component* owner = nullptr;
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Component* lastOwner = nullptr;
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std::function<void()> callback;
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ComponentPeer* lastPeer = nullptr;
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JUCE_DECLARE_NON_COPYABLE (VBlankAttachment)
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};
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} // namespace juce
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