blob: 300cd6fb84297ecf7b1b3a80967553cfc3c4ce41 (
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
|
/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "swipegesturerecognizer.h"
void SwipeGestureRecognizer::registerRecognizer()
{
QGestureRecognizer::registerRecognizer(new SwipeGestureRecognizer);
}
SwipeGestureRecognizer::SwipeGestureRecognizer()
{
}
QGesture *SwipeGestureRecognizer::create(QObject *)
{
return new QSwipeGesture;
}
QGestureRecognizer::Result SwipeGestureRecognizer::recognize(QGesture *state, QObject *,
QEvent *event)
{
QSwipeGesture *q = static_cast<QSwipeGesture *>(state);
QGraphicsSceneMouseEvent *ev = static_cast<QGraphicsSceneMouseEvent *>(event);
switch(event->type()) {
case QEvent::GraphicsSceneMousePress:
if (ev->modifiers() & (Qt::ControlModifier | Qt::ShiftModifier | Qt::ControlModifier))
return QGestureRecognizer::Ignore;
if (ev->buttons() == Qt::LeftButton) {
state->setProperty("startPos", ev->screenPos());
state->setHotSpot(ev->screenPos());
state->setHandled(false);
ev->accept();
return QGestureRecognizer::MayBeGesture;
}
return QGestureRecognizer::Ignore;
case QEvent::GraphicsSceneMouseMove:
if (!state->property("startPos").toPoint().isNull()) {
QPoint startPos = state->property("startPos").toPoint();
QPoint delta = ev->screenPos() - startPos;
if (delta.manhattanLength() > 100) {
q->setSwipeAngle(QLineF(startPos, ev->screenPos()).angle());
return QGestureRecognizer::FinishGesture;
}
}
return QGestureRecognizer::Ignore;
case QEvent::GraphicsSceneMouseRelease:
return QGestureRecognizer::Ignore;
default:
break;
}
return QGestureRecognizer::Ignore;
}
void SwipeGestureRecognizer::reset(QGesture *state)
{
QSwipeGesture *q = static_cast<QSwipeGesture *>(state);
q->setSwipeAngle(0);
q->setProperty("startPos", QVariant());
}
|
