summaryrefslogtreecommitdiffstats
path: root/src/widgets/util/qundoview.cpp
blob: bed894b5b81028f8350f96da8eaa25f6ea10c0f2 (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
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** 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 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 "qundostack.h"
#include "qundoview.h"

#ifndef QT_NO_UNDOVIEW

#include "qundogroup.h"
#include <QtCore/qabstractitemmodel.h>
#include <QtCore/qpointer.h>
#include <QtGui/qicon.h>
#include <private/qlistview_p.h>

QT_BEGIN_NAMESPACE

class QUndoModel : public QAbstractItemModel
{
    Q_OBJECT
public:
    QUndoModel(QObject *parent = 0);

    QUndoStack *stack() const;

    virtual QModelIndex index(int row, int column,
                const QModelIndex &parent = QModelIndex()) const;
    virtual QModelIndex parent(const QModelIndex &child) const;
    virtual int rowCount(const QModelIndex &parent = QModelIndex()) const;
    virtual int columnCount(const QModelIndex &parent = QModelIndex()) const;
    virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;

    QModelIndex selectedIndex() const;
    QItemSelectionModel *selectionModel() const;

    QString emptyLabel() const;
    void setEmptyLabel(const QString &label);

    void setCleanIcon(const QIcon &icon);
    QIcon cleanIcon() const;

public slots:
    void setStack(QUndoStack *stack);

private slots:
    void stackChanged();
    void stackDestroyed(QObject *obj);
    void setStackCurrentIndex(const QModelIndex &index);

private:
    QUndoStack *m_stack;
    QItemSelectionModel *m_sel_model;
    QString m_emty_label;
    QIcon m_clean_icon;
};

QUndoModel::QUndoModel(QObject *parent)
    : QAbstractItemModel(parent)
{
    m_stack = 0;
    m_sel_model = new QItemSelectionModel(this, this);
    connect(m_sel_model, SIGNAL(currentChanged(QModelIndex,QModelIndex)),
            this, SLOT(setStackCurrentIndex(QModelIndex)));
    m_emty_label = tr("<empty>");
}

QItemSelectionModel *QUndoModel::selectionModel() const
{
    return m_sel_model;
}

QUndoStack *QUndoModel::stack() const
{
    return m_stack;
}

void QUndoModel::setStack(QUndoStack *stack)
{
    if (m_stack == stack)
        return;

    if (m_stack != 0) {
        disconnect(m_stack, SIGNAL(cleanChanged(bool)), this, SLOT(stackChanged()));
        disconnect(m_stack, SIGNAL(indexChanged(int)), this, SLOT(stackChanged()));
        disconnect(m_stack, SIGNAL(destroyed(QObject*)), this, SLOT(stackDestroyed(QObject*)));
    }
    m_stack = stack;
    if (m_stack != 0) {
        connect(m_stack, SIGNAL(cleanChanged(bool)), this, SLOT(stackChanged()));
        connect(m_stack, SIGNAL(indexChanged(int)), this, SLOT(stackChanged()));
        connect(m_stack, SIGNAL(destroyed(QObject*)), this, SLOT(stackDestroyed(QObject*)));
    }

    stackChanged();
}

void QUndoModel::stackDestroyed(QObject *obj)
{
    if (obj != m_stack)
        return;
    m_stack = 0;

    stackChanged();
}

void QUndoModel::stackChanged()
{
    beginResetModel();
    endResetModel();
    m_sel_model->setCurrentIndex(selectedIndex(), QItemSelectionModel::ClearAndSelect);
}

void QUndoModel::setStackCurrentIndex(const QModelIndex &index)
{
    if (m_stack == 0)
        return;

    if (index == selectedIndex())
        return;

    if (index.column() != 0)
        return;

    m_stack->setIndex(index.row());
}

QModelIndex QUndoModel::selectedIndex() const
{
    return m_stack == 0 ? QModelIndex() : createIndex(m_stack->index(), 0);
}

QModelIndex QUndoModel::index(int row, int column, const QModelIndex &parent) const
{
    if (m_stack == 0)
        return QModelIndex();

    if (parent.isValid())
        return QModelIndex();

    if (column != 0)
        return QModelIndex();

    if (row < 0 || row > m_stack->count())
        return QModelIndex();

    return createIndex(row, column);
}

QModelIndex QUndoModel::parent(const QModelIndex&) const
{
    return QModelIndex();
}

int QUndoModel::rowCount(const QModelIndex &parent) const
{
    if (m_stack == 0)
        return 0;

    if (parent.isValid())
        return 0;

    return m_stack->count() + 1;
}

int QUndoModel::columnCount(const QModelIndex&) const
{
    return 1;
}

QVariant QUndoModel::data(const QModelIndex &index, int role) const
{
    if (m_stack == 0)
        return QVariant();

    if (index.column() != 0)
        return QVariant();

    if (index.row() < 0 || index.row() > m_stack->count())
        return QVariant();

    if (role == Qt::DisplayRole) {
        if (index.row() == 0)
            return m_emty_label;
        return m_stack->text(index.row() - 1);
    } else if (role == Qt::DecorationRole) {
        if (index.row() == m_stack->cleanIndex() && !m_clean_icon.isNull())
            return m_clean_icon;
        return QVariant();
    }

    return QVariant();
}

QString QUndoModel::emptyLabel() const
{
    return m_emty_label;
}

void QUndoModel::setEmptyLabel(const QString &label)
{
    m_emty_label = label;
    stackChanged();
}

void QUndoModel::setCleanIcon(const QIcon &icon)
{
    m_clean_icon = icon;
    stackChanged();
}

QIcon QUndoModel::cleanIcon() const
{
    return m_clean_icon;
}

/*!
    \class QUndoView
    \brief The QUndoView class displays the contents of a QUndoStack.
    \since 4.2

    \ingroup advanced
    \inmodule QtWidgets

    QUndoView is a QListView which displays the list of commands pushed on an undo stack.
    The most recently executed command is always selected. Selecting a different command
    results in a call to QUndoStack::setIndex(), rolling the state of the document
    backwards or forward to the new command.

    The stack can be set explicitly with setStack(). Alternatively, a QUndoGroup object can
    be set with setGroup(). The view will then update itself automatically whenever the
    active stack of the group changes.

    \image qundoview.png
*/

class QUndoViewPrivate : public QListViewPrivate
{
    Q_DECLARE_PUBLIC(QUndoView)
public:
    QUndoViewPrivate() :
#ifndef QT_NO_UNDOGROUP
        group(0),
#endif
        model(0) {}

#ifndef QT_NO_UNDOGROUP
    QPointer<QUndoGroup> group;
#endif
    QUndoModel *model;

    void init();
};

void QUndoViewPrivate::init()
{
    Q_Q(QUndoView);

    model = new QUndoModel(q);
    q->setModel(model);
    q->setSelectionModel(model->selectionModel());
}

/*!
    Constructs a new view with parent \a parent.
*/

QUndoView::QUndoView(QWidget *parent)
    : QListView(*new QUndoViewPrivate(), parent)
{
    Q_D(QUndoView);
    d->init();
}

/*!
    Constructs a new view with parent \a parent and sets the observed stack to \a stack.
*/

QUndoView::QUndoView(QUndoStack *stack, QWidget *parent)
    : QListView(*new QUndoViewPrivate(), parent)
{
    Q_D(QUndoView);
    d->init();
    setStack(stack);
}

#ifndef QT_NO_UNDOGROUP

/*!
    Constructs a new view with parent \a parent and sets the observed group to \a group.

    The view will update itself autmiatically whenever the active stack of the group changes.
*/

QUndoView::QUndoView(QUndoGroup *group, QWidget *parent)
    : QListView(*new QUndoViewPrivate(), parent)
{
    Q_D(QUndoView);
    d->init();
    setGroup(group);
}

#endif // QT_NO_UNDOGROUP

/*!
    Destroys this view.
*/

QUndoView::~QUndoView()
{
}

/*!
    Returns the stack currently displayed by this view. If the view is looking at a
    QUndoGroup, this the group's active stack.

    \sa setStack(), setGroup()
*/

QUndoStack *QUndoView::stack() const
{
    Q_D(const QUndoView);
    return d->model->stack();
}

/*!
    Sets the stack displayed by this view to \a stack. If \a stack is 0, the view
    will be empty.

    If the view was previously looking at a QUndoGroup, the group is set to 0.

    \sa stack(), setGroup()
*/

void QUndoView::setStack(QUndoStack *stack)
{
    Q_D(QUndoView);
#ifndef QT_NO_UNDOGROUP
    setGroup(0);
#endif
    d->model->setStack(stack);
}

#ifndef QT_NO_UNDOGROUP

/*!
    Sets the group displayed by this view to \a group. If \a group is 0, the view will
    be empty.

    The view will update itself autmiatically whenever the active stack of the group changes.

    \sa group(), setStack()
*/

void QUndoView::setGroup(QUndoGroup *group)
{
    Q_D(QUndoView);

    if (d->group == group)
        return;

    if (d->group != 0) {
        disconnect(d->group, SIGNAL(activeStackChanged(QUndoStack*)),
                d->model, SLOT(setStack(QUndoStack*)));
    }

    d->group = group;

    if (d->group != 0) {
        connect(d->group, SIGNAL(activeStackChanged(QUndoStack*)),
                d->model, SLOT(setStack(QUndoStack*)));
        d->model->setStack(d->group->activeStack());
    } else {
        d->model->setStack(0);
    }
}

/*!
    Returns the group displayed by this view.

    If the view is not looking at group, this function returns 0.

    \sa setGroup(), setStack()
*/

QUndoGroup *QUndoView::group() const
{
    Q_D(const QUndoView);
    return d->group;
}

#endif // QT_NO_UNDOGROUP

/*!
    \property QUndoView::emptyLabel
    \brief the label used for the empty state.

    The empty label is the topmost element in the list of commands, which represents
    the state of the document before any commands were pushed on the stack. The default
    is the string "<empty>".
*/

void QUndoView::setEmptyLabel(const QString &label)
{
    Q_D(QUndoView);
    d->model->setEmptyLabel(label);
}

QString QUndoView::emptyLabel() const
{
    Q_D(const QUndoView);
    return d->model->emptyLabel();
}

/*!
    \property QUndoView::cleanIcon
    \brief the icon used to represent the clean state.

    A stack may have a clean state set with QUndoStack::setClean(). This is usually
    the state of the document at the point it was saved. QUndoView can display an
    icon in the list of commands to show the clean state. If this property is
    a null icon, no icon is shown. The default value is the null icon.
*/

void QUndoView::setCleanIcon(const QIcon &icon)
{
    Q_D(const QUndoView);
    d->model->setCleanIcon(icon);

}

QIcon QUndoView::cleanIcon() const
{
    Q_D(const QUndoView);
    return d->model->cleanIcon();
}

QT_END_NAMESPACE

#include "qundoview.moc"

#endif // QT_NO_UNDOVIEW