1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 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, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/
#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();
bool isAnimated() const
{ return m_timeLine.state() == QTimeLine::Running; }
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 bool isAnimated();
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
|
