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// Copyright (C) 2020 Uwe Kindler
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-2.1-or-later OR GPL-3.0-or-later
#pragma once
#include "floatingdockcontainer.h"
#include <QWidget>
namespace ADS {
class DockWidget;
class DockAreaWidget;
class FloatingDragPreviewPrivate;
/**
* A floating overlay is a temporary floating widget that is just used to
* indicate the floating widget movement.
* This widget is used as a placeholder for drag operations for non-opaque
* docking
*/
class FloatingDragPreview : public QWidget, public AbstractFloatingWidget
{
Q_OBJECT
private:
FloatingDragPreviewPrivate *d;
friend class FloatingDragPreviewPrivate;
/**
* Cancel non opaque undocking if application becomes inactive
*/
void onApplicationStateChanged(Qt::ApplicationState state);
protected:
/**
* Cares about painting the
*/
void paintEvent(QPaintEvent *event) override;
/**
* The content is a DockArea or a DockWidget
*/
FloatingDragPreview(QWidget *content, QWidget *parent);
public:
using Super = QWidget;
/**
* Creates an instance for undocking the DockWidget in Content parameter
*/
FloatingDragPreview(DockWidget *content);
/**
* Creates an instance for undocking the DockArea given in Content
* parameters
*/
FloatingDragPreview(DockAreaWidget *content);
/**
* Delete private data
*/
~FloatingDragPreview() override;
/**
* We filter the events of the assigned content widget to receive
* escape key presses for canceling the drag operation
*/
bool eventFilter(QObject *watched, QEvent *event) override;
public: // implements AbstractFloatingWidget
void startFloating(const QPoint &dragStartMousePos,
const QSize &size,
eDragState dragState,
QWidget *mouseEventHandler) override;
/**
* Moves the widget to a new position relative to the position given when
* startFloating() was called
*/
void moveFloating() override;
/**
* Finishes dragging.
* Hides the dock overlays and executes the real undocking and docking
* of the assigned Content widget
*/
void finishDragging() override;
signals:
/**
* This signal is emitted, if dragging has been canceled by escape key
* or by active application switching via task manager
*/
void draggingCanceled();
}; // class FloatingDragPreview
} // namespace ADS
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