summaryrefslogtreecommitdiffstats
path: root/tools/designer/src/lib/shared/qdesigner_dnditem.cpp
blob: a81e0b0fbbe00fae3c4a92d69fe5e447a171baee (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
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Designer 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 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 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 the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qdesigner_dnditem_p.h"
#include "formwindowbase_p.h"
#include "ui4_p.h"

#include <QtGui/QPainter>
#include <QtGui/QBitmap>
#include <QtGui/QPixmap>
#include <QtGui/QImage>
#include <QtGui/QLabel>
#include <QtGui/QDrag>
#include <QtGui/QCursor>
#include <QtGui/QDropEvent>
#include <QtGui/QRgb>

#include <QtCore/QMultiMap>

QT_BEGIN_NAMESPACE

namespace qdesigner_internal {

QDesignerDnDItem::QDesignerDnDItem(DropType type, QWidget *source) :
    m_source(source),
    m_type(type),
    m_dom_ui(0),
    m_widget(0),
    m_decoration(0)
{
}

void QDesignerDnDItem::init(DomUI *ui, QWidget *widget, QWidget *decoration,
                                    const QPoint &global_mouse_pos)
{
    Q_ASSERT(widget != 0 || ui != 0);
    Q_ASSERT(decoration != 0);

    m_dom_ui = ui;
    m_widget = widget;
    m_decoration = decoration;

    const QRect geometry = m_decoration->geometry();
    m_hot_spot = global_mouse_pos - m_decoration->geometry().topLeft();
}

QDesignerDnDItem::~QDesignerDnDItem()
{
    if (m_decoration != 0)
        m_decoration->deleteLater();
    delete m_dom_ui;
}

DomUI *QDesignerDnDItem::domUi() const
{
    return m_dom_ui;
}

QWidget *QDesignerDnDItem::decoration() const
{
    return m_decoration;
}

QPoint QDesignerDnDItem::hotSpot() const
{
    return m_hot_spot;
}

QWidget *QDesignerDnDItem::widget() const
{
    return m_widget;
}

QDesignerDnDItem::DropType QDesignerDnDItem::type() const
{
    return m_type;
}

QWidget *QDesignerDnDItem::source() const
{
    return m_source;
}

void QDesignerDnDItem::setDomUi(DomUI *dom_ui)
{
    delete m_dom_ui;
    m_dom_ui = dom_ui;
}

// ---------- QDesignerMimeData

// Make pixmap transparent on Windows only. Mac is transparent by default, Unix usually does not work.
#ifdef Q_WS_WIN
#  define TRANSPARENT_DRAG_PIXMAP
#endif

QDesignerMimeData::QDesignerMimeData(const QDesignerDnDItems &items, QDrag *drag) :
    m_items(items)
{
    enum { Alpha = 200 };
    QPoint decorationTopLeft;
    switch (m_items.size()) {
    case 0:
        break;
    case 1: {
        QWidget *deco = m_items.first()->decoration();
        decorationTopLeft = deco->pos();
        const QPixmap widgetPixmap = QPixmap::grabWidget(deco);
#ifdef TRANSPARENT_DRAG_PIXMAP
        QImage image(widgetPixmap.size(), QImage::Format_ARGB32);
        image.fill(QColor(Qt::transparent).rgba());
        QPainter painter(&image);
        painter.drawPixmap(QPoint(0, 0), widgetPixmap);
        painter.end();
        setImageTransparency(image, Alpha);
        drag->setPixmap(QPixmap::fromImage(image));
#else
        drag->setPixmap(widgetPixmap);
#endif
    }
        break;
    default: {
        // determine size of drag decoration by uniting all geometries
        const QDesignerDnDItems::const_iterator cend = m_items.constEnd();
        QDesignerDnDItems::const_iterator it =m_items.constBegin();
        QRect unitedGeometry = (*it)->decoration()->geometry();
        for (++it; it != cend; ++it )
            unitedGeometry  = unitedGeometry .united((*it)->decoration()->geometry());

        // paint with offset. At the same time, create a mask bitmap, containing widget rectangles.
        QImage image(unitedGeometry.size(), QImage::Format_ARGB32);
        image.fill(QColor(Qt::transparent).rgba());
        QBitmap mask(unitedGeometry.size());
        mask.clear();
        // paint with offset, determine action
        QPainter painter(&image);
        QPainter maskPainter(&mask);
        decorationTopLeft = unitedGeometry.topLeft();
        for (it = m_items.constBegin() ; it != cend; ++it ) {
            QWidget *w = (*it)->decoration();
            const QPixmap wp = QPixmap::grabWidget(w);
            const QPoint pos = w->pos() - decorationTopLeft;
            painter.drawPixmap(pos, wp);
            maskPainter.fillRect(QRect(pos, wp.size()), Qt::color1);
        }
        painter.end();
        maskPainter.end();
#ifdef TRANSPARENT_DRAG_PIXMAP
        setImageTransparency(image, Alpha);
#endif
        QPixmap pixmap = QPixmap::fromImage(image);
        pixmap.setMask(mask);
        drag->setPixmap(pixmap);
    }
        break;
    }
    // determine hot spot and reconstruct the exact starting position as form window
    // introduces some offset when detecting DnD
    m_globalStartPos =  m_items.first()->decoration()->pos() +  m_items.first()->hotSpot();
    m_hotSpot = m_globalStartPos - decorationTopLeft;
    drag->setHotSpot(m_hotSpot);

    drag->setMimeData(this);
}

QDesignerMimeData::~QDesignerMimeData()
{
    const QDesignerDnDItems::const_iterator cend = m_items.constEnd();
    for (QDesignerDnDItems::const_iterator it = m_items.constBegin(); it != cend; ++it )
        delete *it;
}

Qt::DropAction QDesignerMimeData::proposedDropAction() const
{
   return m_items.first()->type() == QDesignerDnDItemInterface::CopyDrop ? Qt::CopyAction : Qt::MoveAction;
}

Qt::DropAction QDesignerMimeData::execDrag(const QDesignerDnDItems &items, QWidget * dragSource)
{
    if (items.empty())
        return Qt::IgnoreAction;

    QDrag *drag = new QDrag(dragSource);
    QDesignerMimeData *mimeData = new QDesignerMimeData(items, drag);

    // Store pointers to widgets that are to be re-shown if a move operation is canceled
    QWidgetList reshowWidgets;
    const QDesignerDnDItems::const_iterator cend = items.constEnd();
    for (QDesignerDnDItems::const_iterator it = items.constBegin(); it != cend; ++it )
        if (QWidget *w = (*it)->widget())
            if ((*it)->type() ==  QDesignerDnDItemInterface::MoveDrop)
                reshowWidgets.push_back(w);

    const Qt::DropAction executedAction = drag->exec(Qt::CopyAction|Qt::MoveAction, mimeData->proposedDropAction());

    if (executedAction == Qt::IgnoreAction && !reshowWidgets.empty())
        foreach (QWidget *w, reshowWidgets)
            w->show();

    return executedAction;
}


void QDesignerMimeData::moveDecoration(const QPoint &globalPos) const
{
    const QPoint relativeDistance = globalPos - m_globalStartPos;
    const QDesignerDnDItems::const_iterator cend = m_items.constEnd();
    for (QDesignerDnDItems::const_iterator it =m_items.constBegin(); it != cend; ++it ) {
        QWidget *w = (*it)->decoration();
        w->move(w->pos() + relativeDistance);
    }
}

void QDesignerMimeData::removeMovedWidgetsFromSourceForm(const QDesignerDnDItems &items)
{
    typedef QMultiMap<FormWindowBase *, QWidget *> FormWidgetMap;
    FormWidgetMap formWidgetMap;
    // Find moved widgets per form
    const QDesignerDnDItems::const_iterator cend = items.constEnd();
    for (QDesignerDnDItems::const_iterator it = items.constBegin(); it != cend; ++it )
        if ((*it)->type() ==  QDesignerDnDItemInterface::MoveDrop)
            if (QWidget *w = (*it)->widget())
                if (FormWindowBase *fb = qobject_cast<FormWindowBase *>((*it)->source()))
                    formWidgetMap.insert(fb, w);
    if (formWidgetMap.empty())
        return;

    foreach (FormWindowBase * fb, formWidgetMap.keys())
        fb->deleteWidgetList(formWidgetMap.values(fb));
}

void QDesignerMimeData::acceptEventWithAction(Qt::DropAction desiredAction, QDropEvent *e)
{
    if (e->proposedAction() == desiredAction) {
        e->acceptProposedAction();
    } else {
        e->setDropAction(desiredAction);
        e->accept();
    }
}

void QDesignerMimeData::acceptEvent(QDropEvent *e) const
{
    acceptEventWithAction(proposedDropAction(), e);
}

void QDesignerMimeData::setImageTransparency(QImage &image, int alpha)
{
    const int height = image.height();
    for (int l = 0; l < height; l++) {
        QRgb *line = reinterpret_cast<QRgb *>(image.scanLine(l));
        QRgb *lineEnd = line + image.width();
        for ( ; line < lineEnd; line++) {
            const QRgb rgba = *line;
            *line = qRgba(qRed(rgba), qGreen(rgba), qBlue(rgba), alpha);
        }
    }
}

} // namespace qdesigner_internal

QT_END_NAMESPACE