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/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** No Commercial Usage
**
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL 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: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**************************************************************************/
#include <QPixmap>
#include <QLabel>
#include <QTimeLine>
#include <QDrag>
QT_BEGIN_NAMESPACE
class QMimeData;
QT_END_NAMESPACE
namespace QmlDesigner {
namespace QmlDesignerItemLibraryDragAndDrop {
class CustomDragAndDropIcon : public QLabel { //this class shows the icon for the drag drop operation
Q_OBJECT
public:
CustomDragAndDropIcon(QWidget *parent = 0) : QLabel(parent), m_oldTarget(0)
{
}
void setPreview(const QPixmap &pixmap)
{ m_preview = pixmap; }
void setIcon(const QPixmap &pixmap)
{ m_icon = pixmap; }
void enter();
void leave();
void startDrag();
void grabMouseSafely();
public slots:
void animateDrag(int frame);
protected:
virtual void mouseMoveEvent(QMouseEvent *);
virtual void paintEvent(QPaintEvent *event);
virtual void mouseReleaseEvent(QMouseEvent *);
private:
QWidget *m_oldTarget;
QPixmap m_preview;
QPixmap m_icon;
QTimeLine m_timeLine;
QSize m_size;
qreal m_iconAlpha, m_previewAlpha;
};
class CustomDragAndDrop { //this class handles the drag and drop logic
public:
static void startCustomDrag(const QPixmap icon, const QPixmap preview, QMimeData * mimeData);
static bool customDragActive();
static bool isAccepted();
static void endCustomDrag();
static void enter(QWidget *target, QPoint globalPos);
static void leave(QWidget *target, QPoint globalPos);
static void move(QWidget *target, QPoint globalPos);
static void drop(QWidget *target, QPoint globalPos);
static void hide()
{ instance()->m_isVisible = false; }
static void show()
{
instance()->m_isVisible = true;
instance()->m_widget->show();
instance()->m_widget->update();
}
static bool isVisible()
{ return instance()->m_isVisible; }
private:
CustomDragAndDrop();
static CustomDragAndDrop* instance();
static CustomDragAndDrop* m_instance;
CustomDragAndDropIcon *m_widget;
bool m_customDragActive;
QPoint m_pos;
QMimeData *m_mimeData;
bool m_accepted;
bool m_isVisible;
friend class CustomDragAndDropGuard;
};
} //namespace QmlDesignerItemLibraryDragAndDrop
class CustomItemLibraryDrag : public QDrag {
Q_OBJECT
public:
CustomItemLibraryDrag(QWidget * dragSource) : QDrag(dragSource), m_mimeData(0)
{}
void setPixmap(const QPixmap &pixmap)
{ m_pixmap = pixmap; }
void setPreview(const QPixmap &pixmap)
{ m_preview = pixmap; }
void setMimeData(QMimeData *mimeData)
{ m_mimeData = mimeData; }
void exec()
{ QmlDesignerItemLibraryDragAndDrop::CustomDragAndDrop::startCustomDrag(m_pixmap, m_preview, m_mimeData); }
public slots:
void stopDrag() {
QmlDesignerItemLibraryDragAndDrop::CustomDragAndDrop::endCustomDrag();
}
private:
QPixmap m_pixmap, m_preview;
QMimeData *m_mimeData;
};
} //namespave QmlDesigner
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