mirror of
https://github.com/juce-framework/JUCE.git
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60 lines
2.4 KiB
C++
60 lines
2.4 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE 6 technical preview.
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Copyright (c) 2020 - Raw Material Software Limited
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You may use this code under the terms of the GPL v3
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(see www.gnu.org/licenses).
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For this technical preview, this file is not subject to commercial licensing.
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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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ComponentDragger::ComponentDragger() {}
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ComponentDragger::~ComponentDragger() {}
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//==============================================================================
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void ComponentDragger::startDraggingComponent (Component* const componentToDrag, const MouseEvent& e)
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{
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jassert (componentToDrag != nullptr);
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jassert (e.mods.isAnyMouseButtonDown()); // The event has to be a drag event!
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if (componentToDrag != nullptr)
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mouseDownWithinTarget = e.getEventRelativeTo (componentToDrag).getMouseDownPosition();
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}
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void ComponentDragger::dragComponent (Component* const componentToDrag, const MouseEvent& e,
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ComponentBoundsConstrainer* const constrainer)
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{
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jassert (componentToDrag != nullptr);
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jassert (e.mods.isAnyMouseButtonDown()); // The event has to be a drag event!
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if (componentToDrag != nullptr)
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{
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auto bounds = componentToDrag->getBounds();
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// If the component is a window, multiple mouse events can get queued while it's in the same position,
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// so their coordinates become wrong after the first one moves the window, so in that case, we'll use
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// the current mouse position instead of the one that the event contains...
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if (componentToDrag->isOnDesktop())
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bounds += componentToDrag->getLocalPoint (nullptr, e.source.getScreenPosition()).roundToInt() - mouseDownWithinTarget;
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else
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bounds += e.getEventRelativeTo (componentToDrag).getPosition() - mouseDownWithinTarget;
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if (constrainer != nullptr)
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constrainer->setBoundsForComponent (componentToDrag, bounds, false, false, false, false);
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else
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componentToDrag->setBounds (bounds);
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}
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}
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} // namespace juce
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