summaryrefslogtreecommitdiffstats
path: root/src/gui/kernel/qplatformdrag.cpp
blob: 903f6686a8bbbd9e2e74439153fda0d559f66b15 (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
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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or 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.GPL2 and 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-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qplatformdrag.h"

#include <QtGui/private/qdnd_p.h>
#include <QtGui/QKeyEvent>
#include <QtGui/QGuiApplication>
#include <QtCore/QEventLoop>

QT_BEGIN_NAMESPACE

#ifndef QT_NO_DRAGANDDROP
#ifdef QDND_DEBUG
#  include <QtCore/QDebug>
#endif

QPlatformDropQtResponse::QPlatformDropQtResponse(bool accepted, Qt::DropAction acceptedAction)
    : m_accepted(accepted)
    , m_accepted_action(acceptedAction)
{
}

bool QPlatformDropQtResponse::isAccepted() const
{
    return m_accepted;
}

Qt::DropAction QPlatformDropQtResponse::acceptedAction() const
{
    return m_accepted_action;
}

QPlatformDragQtResponse::QPlatformDragQtResponse(bool accepted, Qt::DropAction acceptedAction, QRect answerRect)
    : QPlatformDropQtResponse(accepted,acceptedAction)
    , m_answer_rect(answerRect)
{
}

QRect QPlatformDragQtResponse::answerRect() const
{
    return m_answer_rect;
}

class QPlatformDragPrivate {
public:
    QPlatformDragPrivate() : cursor_drop_action(Qt::IgnoreAction) {}

    Qt::DropAction cursor_drop_action;
};

/*!
    \class QPlatformDrag
    \since 5.0
    \internal
    \preliminary
    \ingroup qpa

    \brief The QPlatformDrag class provides an abstraction for drag.
 */
QPlatformDrag::QPlatformDrag() : d_ptr(new QPlatformDragPrivate)
{
}

QPlatformDrag::~QPlatformDrag()
{
    delete d_ptr;
}

QDrag *QPlatformDrag::currentDrag() const
{
    return QDragManager::self()->object();
}

Qt::DropAction QPlatformDrag::defaultAction(Qt::DropActions possibleActions,
                                           Qt::KeyboardModifiers modifiers) const
{
#ifdef QDND_DEBUG
    qDebug() << "QDragManager::defaultAction(Qt::DropActions possibleActions)\nkeyboard modifiers : " << modifiers;
#endif

    Qt::DropAction default_action = Qt::IgnoreAction;

    if (currentDrag()) {
        default_action = currentDrag()->defaultAction();
    }


    if (default_action == Qt::IgnoreAction) {
        //This means that the drag was initiated by QDrag::start and we need to
        //preserve the old behavior
        default_action = Qt::CopyAction;
    }

    if (modifiers & Qt::ControlModifier && modifiers & Qt::ShiftModifier)
        default_action = Qt::LinkAction;
    else if (modifiers & Qt::ControlModifier)
        default_action = Qt::CopyAction;
    else if (modifiers & Qt::ShiftModifier)
        default_action = Qt::MoveAction;
    else if (modifiers & Qt::AltModifier)
        default_action = Qt::LinkAction;

#ifdef QDND_DEBUG
    qDebug() << "possible actions : " << possibleActions;
#endif

    // Check if the action determined is allowed
    if (!(possibleActions & default_action)) {
        if (possibleActions & Qt::CopyAction)
            default_action = Qt::CopyAction;
        else if (possibleActions & Qt::MoveAction)
            default_action = Qt::MoveAction;
        else if (possibleActions & Qt::LinkAction)
            default_action = Qt::LinkAction;
        else
            default_action = Qt::IgnoreAction;
    }

#ifdef QDND_DEBUG
    qDebug() << "default action : " << default_action;
#endif

    return default_action;
}

/*!
    \brief Cancels the currently active drag (only for drags of
    the current application initiated by QPlatformDrag::drag()).

    The default implementation does nothing.

    \since 5.6
 */

void QPlatformDrag::cancelDrag()
{
    Q_UNIMPLEMENTED();
}

/*!
    \brief Called to notify QDrag about changes of the current action.
 */

void QPlatformDrag::updateAction(Qt::DropAction action)
{
    Q_D(QPlatformDrag);
    if (d->cursor_drop_action != action) {
        d->cursor_drop_action = action;
        emit currentDrag()->actionChanged(action);
    }
}

static const char *const default_pm[] = {
"13 9 3 1",
".      c None",
"       c #000000",
"X      c #FFFFFF",
"X X X X X X X",
" X X X X X X ",
"X ......... X",
" X.........X ",
"X ......... X",
" X.........X ",
"X ......... X",
" X X X X X X ",
"X X X X X X X",
};

Q_GLOBAL_STATIC_WITH_ARGS(QPixmap,qt_drag_default_pixmap,(default_pm))

QPixmap QPlatformDrag::defaultPixmap()
{
    return *qt_drag_default_pixmap();
}

/*!
    \since 5.4
    \brief Returns bool indicating whether QPlatformDrag takes ownership
    and therefore responsibility of deleting the QDrag object passed in
    from QPlatformDrag::drag. This can be useful on platforms where QDrag
    object has to be kept around.
 */
bool QPlatformDrag::ownsDragObject() const
{
    return false;
}

#endif // QT_NO_DRAGANDDROP

QT_END_NAMESPACE