103 lines
3.5 KiB
C
103 lines
3.5 KiB
C
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/*
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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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/**
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An object to take care of the logic for dragging components around with the mouse.
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Very easy to use - in your mouseDown() callback, call startDraggingComponent(),
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then in your mouseDrag() callback, call dragComponent().
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When starting a drag, you can give it a ComponentBoundsConstrainer to use
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to limit the component's position and keep it on-screen.
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e.g. @code
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class MyDraggableComp
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{
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ComponentDragger myDragger;
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void mouseDown (const MouseEvent& e)
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{
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myDragger.startDraggingComponent (this, e);
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}
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void mouseDrag (const MouseEvent& e)
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{
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myDragger.dragComponent (this, e, nullptr);
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}
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};
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@endcode
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@tags{GUI}
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*/
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class JUCE_API ComponentDragger
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{
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public:
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//==============================================================================
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/** Creates a ComponentDragger. */
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ComponentDragger();
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/** Destructor. */
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virtual ~ComponentDragger();
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//==============================================================================
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/** Call this from your component's mouseDown() method, to prepare for dragging.
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@param componentToDrag the component that you want to drag
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@param e the mouse event that is triggering the drag
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@see dragComponent
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*/
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void startDraggingComponent (Component* componentToDrag,
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const MouseEvent& e);
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/** Call this from your mouseDrag() callback to move the component.
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This will move the component, using the given constrainer object to check
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the new position.
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@param componentToDrag the component that you want to drag
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@param e the current mouse-drag event
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@param constrainer an optional constrainer object that should be used
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to apply limits to the component's position. Pass
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null if you don't want to contrain the movement.
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@see startDraggingComponent
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*/
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void dragComponent (Component* componentToDrag,
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const MouseEvent& e,
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ComponentBoundsConstrainer* constrainer);
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private:
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//==============================================================================
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Point<int> mouseDownWithinTarget;
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ComponentDragger)
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};
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} // namespace juce
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