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95 lines
3.9 KiB
95 lines
3.9 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_COMPONENTMOVEMENTWATCHER_H_INCLUDED
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#define JUCE_COMPONENTMOVEMENTWATCHER_H_INCLUDED
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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 or QuickTimeComponent
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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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*/
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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;
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Array <Component*> registeredParentComps;
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bool reentrant, 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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#endif // JUCE_COMPONENTMOVEMENTWATCHER_H_INCLUDED
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