98 lines
3.8 KiB
C++
98 lines
3.8 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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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 5 End-User License
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Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
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27th April 2017).
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End User License Agreement: www.juce.com/juce-5-licence
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Privacy Policy: www.juce.com/juce-5-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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//==============================================================================
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/** An object that watches for any movement of a component or any of its parent components.
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This makes it easy to check when a component is moved relative to its top-level
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peer window. The normal Component::moved() method is only called when a component
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moves relative to its immediate parent, and sometimes you want to know if any of
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components higher up the tree have moved (which of course will affect the overall
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position of all their sub-components).
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It also includes a callback that lets you know when the top-level peer is changed.
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This class is used by specialised components like WebBrowserComponent
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because they need to keep their custom windows in the right place and respond to
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changes in the peer.
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@tags{GUI}
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*/
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class JUCE_API ComponentMovementWatcher : public ComponentListener
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{
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public:
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//==============================================================================
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/** Creates a ComponentMovementWatcher to watch a given target component. */
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ComponentMovementWatcher (Component* component);
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/** Destructor. */
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~ComponentMovementWatcher();
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//==============================================================================
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/** This callback happens when the component that is being watched is moved
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relative to its top-level peer window, or when it is resized. */
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virtual void componentMovedOrResized (bool wasMoved, bool wasResized) = 0;
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/** This callback happens when the component's top-level peer is changed. */
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virtual void componentPeerChanged() = 0;
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/** This callback happens when the component's visibility state changes, possibly due to
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one of its parents being made visible or invisible.
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*/
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virtual void componentVisibilityChanged() = 0;
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/** Returns the component that's being watched. */
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Component* getComponent() const noexcept { return component; }
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//==============================================================================
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/** @internal */
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void componentParentHierarchyChanged (Component&) override;
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/** @internal */
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void componentMovedOrResized (Component&, bool wasMoved, bool wasResized) override;
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/** @internal */
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void componentBeingDeleted (Component&) override;
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/** @internal */
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void componentVisibilityChanged (Component&) override;
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private:
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//==============================================================================
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WeakReference<Component> component;
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uint32 lastPeerID = 0;
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Array<Component*> registeredParentComps;
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bool reentrant = false, wasShowing;
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Rectangle<int> lastBounds;
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void unregister();
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void registerWithParentComps();
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ComponentMovementWatcher)
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};
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} // namespace juce
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