paulxstretch/deps/juce/modules/juce_gui_basics/layout/juce_ComponentMovementWatcher.h
essej 25bd5d8adb git subrepo clone --branch=sono6good https://github.com/essej/JUCE.git deps/juce
subrepo:
  subdir:   "deps/juce"
  merged:   "b13f9084e"
upstream:
  origin:   "https://github.com/essej/JUCE.git"
  branch:   "sono6good"
  commit:   "b13f9084e"
git-subrepo:
  version:  "0.4.3"
  origin:   "https://github.com/ingydotnet/git-subrepo.git"
  commit:   "2f68596"
2022-04-18 17:51:22 -04:00

97 lines
3.8 KiB
C++

/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2020 - Raw Material Software Limited
JUCE is an open source library subject to commercial or open-source
licensing.
By using JUCE, you agree to the terms of both the JUCE 6 End-User License
Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).
End User License Agreement: www.juce.com/juce-6-licence
Privacy Policy: www.juce.com/juce-privacy-policy
Or: You may also use this code under the terms of the GPL v3 (see
www.gnu.org/licenses).
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
DISCLAIMED.
==============================================================================
*/
namespace juce
{
//==============================================================================
/** An object that watches for any movement of a component or any of its parent components.
This makes it easy to check when a component is moved relative to its top-level
peer window. The normal Component::moved() method is only called when a component
moves relative to its immediate parent, and sometimes you want to know if any of
components higher up the tree have moved (which of course will affect the overall
position of all their sub-components).
It also includes a callback that lets you know when the top-level peer is changed.
This class is used by specialised components like WebBrowserComponent
because they need to keep their custom windows in the right place and respond to
changes in the peer.
@tags{GUI}
*/
class JUCE_API ComponentMovementWatcher : public ComponentListener
{
public:
//==============================================================================
/** Creates a ComponentMovementWatcher to watch a given target component. */
ComponentMovementWatcher (Component* componentToWatch);
/** Destructor. */
~ComponentMovementWatcher() override;
//==============================================================================
/** This callback happens when the component that is being watched is moved
relative to its top-level peer window, or when it is resized. */
virtual void componentMovedOrResized (bool wasMoved, bool wasResized) = 0;
/** This callback happens when the component's top-level peer is changed. */
virtual void componentPeerChanged() = 0;
/** This callback happens when the component's visibility state changes, possibly due to
one of its parents being made visible or invisible.
*/
virtual void componentVisibilityChanged() = 0;
/** Returns the component that's being watched. */
Component* getComponent() const noexcept { return component.get(); }
//==============================================================================
/** @internal */
void componentParentHierarchyChanged (Component&) override;
/** @internal */
void componentMovedOrResized (Component&, bool wasMoved, bool wasResized) override;
/** @internal */
void componentBeingDeleted (Component&) override;
/** @internal */
void componentVisibilityChanged (Component&) override;
private:
//==============================================================================
WeakReference<Component> component;
uint32 lastPeerID = 0;
Array<Component*> registeredParentComps;
bool reentrant = false, wasShowing;
Rectangle<int> lastBounds;
void unregister();
void registerWithParentComps();
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ComponentMovementWatcher)
};
} // namespace juce