blob: 2dfff6953612c87a8c02f95135701063b1935a5d (
plain)
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
|
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the Graphics Dojo project on Qt Labs.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 or 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file. Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
** http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/
#include "dragmovecharm.h"
#include <QEvent>
#include <QHash>
#include <QMouseEvent>
#include <QWidget>
struct DragMoveData {
bool isMoving;
QPoint startDrag;
};
class DragMoveCharmPrivate
{
public:
QHash<QWidget*, DragMoveData*> dragMoveData;
};
DragMoveCharm::DragMoveCharm(QObject *parent): QObject(parent)
{
d = new DragMoveCharmPrivate;
}
DragMoveCharm::~DragMoveCharm()
{
delete d;
}
void DragMoveCharm::activateOn(QWidget *widget)
{
if (d->dragMoveData.contains(widget))
return;
DragMoveData *data = new DragMoveData;
data->startDrag = QPoint(0, 0);
data->isMoving = false;
d->dragMoveData[widget] = data;
widget->installEventFilter(this);
}
void DragMoveCharm::deactivateFrom(QWidget *widget)
{
delete d->dragMoveData[widget];
d->dragMoveData.remove(widget);
widget->removeEventFilter(this);
}
bool DragMoveCharm::eventFilter(QObject *object, QEvent *event)
{
QWidget *widget = qobject_cast<QWidget*>(object);
if (!widget)
return false;
QEvent::Type type = event->type();
if (type != QEvent::MouseButtonPress &&
type != QEvent::MouseButtonRelease &&
type != QEvent::MouseMove)
return false;
QMouseEvent *mouseEvent = dynamic_cast<QMouseEvent*>(event);
if (!mouseEvent || mouseEvent->modifiers() != Qt::NoModifier)
return false;
Qt::MouseButton button = mouseEvent->button();
DragMoveData *data = d->dragMoveData.value(widget);
if (!widget || !data)
return false;
bool consumed = false;
if (type == QEvent::MouseButtonPress && button == Qt::LeftButton) {
data->startDrag = mouseEvent->globalPos();
data->isMoving = true;
event->accept();
consumed = true;
}
if (type == QEvent::MouseButtonRelease) {
data->startDrag = QPoint(0, 0);
data->isMoving = false;
}
if (type == QEvent::MouseMove && data->isMoving) {
QPoint pos = mouseEvent->globalPos();
widget->move(widget->pos() + pos - data->startDrag);
data->startDrag = pos;
consumed = true;
}
return consumed;
}
|
