juicysfplugin/modules/juce_gui_basics/mouse/juce_ComponentDragger.cpp

69 lines
2.7 KiB
C++

/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2017 - ROLI Ltd.
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 5 End-User License
Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
27th April 2017).
End User License Agreement: www.juce.com/juce-5-licence
Privacy Policy: www.juce.com/juce-5-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
{
ComponentDragger::ComponentDragger() {}
ComponentDragger::~ComponentDragger() {}
//==============================================================================
void ComponentDragger::startDraggingComponent (Component* const componentToDrag, const MouseEvent& e)
{
jassert (componentToDrag != nullptr);
jassert (e.mods.isAnyMouseButtonDown()); // The event has to be a drag event!
if (componentToDrag != nullptr)
mouseDownWithinTarget = e.getEventRelativeTo (componentToDrag).getMouseDownPosition();
}
void ComponentDragger::dragComponent (Component* const componentToDrag, const MouseEvent& e,
ComponentBoundsConstrainer* const constrainer)
{
jassert (componentToDrag != nullptr);
jassert (e.mods.isAnyMouseButtonDown()); // The event has to be a drag event!
if (componentToDrag != nullptr)
{
Rectangle<int> bounds (componentToDrag->getBounds());
// If the component is a window, multiple mouse events can get queued while it's in the same position,
// so their coordinates become wrong after the first one moves the window, so in that case, we'll use
// the current mouse position instead of the one that the event contains...
if (componentToDrag->isOnDesktop())
bounds += componentToDrag->getLocalPoint (nullptr, e.source.getScreenPosition()).roundToInt() - mouseDownWithinTarget;
else
bounds += e.getEventRelativeTo (componentToDrag).getPosition() - mouseDownWithinTarget;
if (constrainer != nullptr)
constrainer->setBoundsForComponent (componentToDrag, bounds, false, false, false, false);
else
componentToDrag->setBounds (bounds);
}
}
} // namespace juce