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/****************************************************************************
**
** Copyright (C) 2020 Uwe Kindler
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or (at your option) any later version.
** The licenses are as published by the Free Software Foundation
** and appearing in the file LICENSE.LGPLv21 included in the packaging
** of this file. Please review the following information to ensure
** the GNU Lesser General Public License version 2.1 requirements
** will be met: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/
#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:
/**
* Updates the drop overlays
*/
virtual void moveEvent(QMoveEvent *event) override;
/**
* Cares about painting the
*/
virtual 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
*/
virtual bool eventFilter(QObject *watched, QEvent *event) override;
public: // implements AbstractFloatingWidget
virtual 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
*/
virtual void moveFloating() override;
/**
* Finishes dragging.
* Hides the dock overlays and executes the real undocking and docking
* of the assigned Content widget
*/
virtual 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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