qundoview.cpp

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1/****************************************************************************-
2**-
3** Copyright (C) 2015 The Qt Company Ltd.-
4** Contact: http://www.qt.io/licensing/-
5**-
6** This file is part of the QtWidgets module of the Qt Toolkit.-
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29**-
30** $QT_END_LICENSE$-
31**-
32****************************************************************************/-
33-
34#include "qundostack.h"-
35#include "qundoview.h"-
36-
37#ifndef QT_NO_UNDOVIEW-
38-
39#include "qundogroup.h"-
40#include <QtCore/qabstractitemmodel.h>-
41#include <QtCore/qpointer.h>-
42#include <QtGui/qicon.h>-
43#include <private/qlistview_p.h>-
44-
45QT_BEGIN_NAMESPACE-
46-
47class QUndoModel : public QAbstractItemModel-
48{-
49 Q_OBJECT-
50public:-
51 QUndoModel(QObject *parent = 0);-
52-
53 QUndoStack *stack() const;-
54-
55 virtual QModelIndex index(int row, int column,-
56 const QModelIndex &parent = QModelIndex()) const Q_DECL_OVERRIDE;-
57 virtual QModelIndex parent(const QModelIndex &child) const Q_DECL_OVERRIDE;-
58 virtual int rowCount(const QModelIndex &parent = QModelIndex()) const Q_DECL_OVERRIDE;-
59 virtual int columnCount(const QModelIndex &parent = QModelIndex()) const Q_DECL_OVERRIDE;-
60 virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const Q_DECL_OVERRIDE;-
61-
62 QModelIndex selectedIndex() const;-
63 QItemSelectionModel *selectionModel() const;-
64-
65 QString emptyLabel() const;-
66 void setEmptyLabel(const QString &label);-
67-
68 void setCleanIcon(const QIcon &icon);-
69 QIcon cleanIcon() const;-
70-
71public slots:-
72 void setStack(QUndoStack *stack);-
73-
74private slots:-
75 void stackChanged();-
76 void stackDestroyed(QObject *obj);-
77 void setStackCurrentIndex(const QModelIndex &index);-
78-
79private:-
80 QUndoStack *m_stack;-
81 QItemSelectionModel *m_sel_model;-
82 QString m_emty_label;-
83 QIcon m_clean_icon;-
84};-
85-
86QUndoModel::QUndoModel(QObject *parent)-
87 : QAbstractItemModel(parent)-
88{-
89 m_stack = 0;-
90 m_sel_model = new QItemSelectionModel(this, this);-
91 connect(m_sel_model, SIGNAL(currentChanged(QModelIndex,QModelIndex)),-
92 this, SLOT(setStackCurrentIndex(QModelIndex)));-
93 m_emty_label = tr("<empty>");-
94}
never executed: end of block
0
95-
96QItemSelectionModel *QUndoModel::selectionModel() const-
97{-
98 return m_sel_model;
never executed: return m_sel_model;
0
99}-
100-
101QUndoStack *QUndoModel::stack() const-
102{-
103 return m_stack;
never executed: return m_stack;
0
104}-
105-
106void QUndoModel::setStack(QUndoStack *stack)-
107{-
108 if (m_stack == stack)
m_stack == stackDescription
TRUEnever evaluated
FALSEnever evaluated
0
109 return;
never executed: return;
0
110-
111 if (m_stack != 0) {
m_stack != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
112 disconnect(m_stack, SIGNAL(cleanChanged(bool)), this, SLOT(stackChanged()));-
113 disconnect(m_stack, SIGNAL(indexChanged(int)), this, SLOT(stackChanged()));-
114 disconnect(m_stack, SIGNAL(destroyed(QObject*)), this, SLOT(stackDestroyed(QObject*)));-
115 }
never executed: end of block
0
116 m_stack = stack;-
117 if (m_stack != 0) {
m_stack != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
118 connect(m_stack, SIGNAL(cleanChanged(bool)), this, SLOT(stackChanged()));-
119 connect(m_stack, SIGNAL(indexChanged(int)), this, SLOT(stackChanged()));-
120 connect(m_stack, SIGNAL(destroyed(QObject*)), this, SLOT(stackDestroyed(QObject*)));-
121 }
never executed: end of block
0
122-
123 stackChanged();-
124}
never executed: end of block
0
125-
126void QUndoModel::stackDestroyed(QObject *obj)-
127{-
128 if (obj != m_stack)
obj != m_stackDescription
TRUEnever evaluated
FALSEnever evaluated
0
129 return;
never executed: return;
0
130 m_stack = 0;-
131-
132 stackChanged();-
133}
never executed: end of block
0
134-
135void QUndoModel::stackChanged()-
136{-
137 beginResetModel();-
138 endResetModel();-
139 m_sel_model->setCurrentIndex(selectedIndex(), QItemSelectionModel::ClearAndSelect);-
140}
never executed: end of block
0
141-
142void QUndoModel::setStackCurrentIndex(const QModelIndex &index)-
143{-
144 if (m_stack == 0)
m_stack == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
145 return;
never executed: return;
0
146-
147 if (index == selectedIndex())
index == selectedIndex()Description
TRUEnever evaluated
FALSEnever evaluated
0
148 return;
never executed: return;
0
149-
150 if (index.column() != 0)
index.column() != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
151 return;
never executed: return;
0
152-
153 m_stack->setIndex(index.row());-
154}
never executed: end of block
0
155-
156QModelIndex QUndoModel::selectedIndex() const-
157{-
158 return m_stack == 0 ? QModelIndex() : createIndex(m_stack->index(), 0);
never executed: return m_stack == 0 ? QModelIndex() : createIndex(m_stack->index(), 0);
m_stack == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
159}-
160-
161QModelIndex QUndoModel::index(int row, int column, const QModelIndex &parent) const-
162{-
163 if (m_stack == 0)
m_stack == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
164 return QModelIndex();
never executed: return QModelIndex();
0
165-
166 if (parent.isValid())
parent.isValid()Description
TRUEnever evaluated
FALSEnever evaluated
0
167 return QModelIndex();
never executed: return QModelIndex();
0
168-
169 if (column != 0)
column != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
170 return QModelIndex();
never executed: return QModelIndex();
0
171-
172 if (row < 0 || row > m_stack->count())
row < 0Description
TRUEnever evaluated
FALSEnever evaluated
row > m_stack->count()Description
TRUEnever evaluated
FALSEnever evaluated
0
173 return QModelIndex();
never executed: return QModelIndex();
0
174-
175 return createIndex(row, column);
never executed: return createIndex(row, column);
0
176}-
177-
178QModelIndex QUndoModel::parent(const QModelIndex&) const-
179{-
180 return QModelIndex();
never executed: return QModelIndex();
0
181}-
182-
183int QUndoModel::rowCount(const QModelIndex &parent) const-
184{-
185 if (m_stack == 0)
m_stack == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
186 return 0;
never executed: return 0;
0
187-
188 if (parent.isValid())
parent.isValid()Description
TRUEnever evaluated
FALSEnever evaluated
0
189 return 0;
never executed: return 0;
0
190-
191 return m_stack->count() + 1;
never executed: return m_stack->count() + 1;
0
192}-
193-
194int QUndoModel::columnCount(const QModelIndex&) const-
195{-
196 return 1;
never executed: return 1;
0
197}-
198-
199QVariant QUndoModel::data(const QModelIndex &index, int role) const-
200{-
201 if (m_stack == 0)
m_stack == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
202 return QVariant();
never executed: return QVariant();
0
203-
204 if (index.column() != 0)
index.column() != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
205 return QVariant();
never executed: return QVariant();
0
206-
207 if (index.row() < 0 || index.row() > m_stack->count())
index.row() < 0Description
TRUEnever evaluated
FALSEnever evaluated
index.row() > m_stack->count()Description
TRUEnever evaluated
FALSEnever evaluated
0
208 return QVariant();
never executed: return QVariant();
0
209-
210 if (role == Qt::DisplayRole) {
role == Qt::DisplayRoleDescription
TRUEnever evaluated
FALSEnever evaluated
0
211 if (index.row() == 0)
index.row() == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
212 return m_emty_label;
never executed: return m_emty_label;
0
213 return m_stack->text(index.row() - 1);
never executed: return m_stack->text(index.row() - 1);
0
214 } else if (role == Qt::DecorationRole) {
role == Qt::DecorationRoleDescription
TRUEnever evaluated
FALSEnever evaluated
0
215 if (index.row() == m_stack->cleanIndex() && !m_clean_icon.isNull())
index.row() ==...->cleanIndex()Description
TRUEnever evaluated
FALSEnever evaluated
!m_clean_icon.isNull()Description
TRUEnever evaluated
FALSEnever evaluated
0
216 return m_clean_icon;
never executed: return m_clean_icon;
0
217 return QVariant();
never executed: return QVariant();
0
218 }-
219-
220 return QVariant();
never executed: return QVariant();
0
221}-
222-
223QString QUndoModel::emptyLabel() const-
224{-
225 return m_emty_label;
never executed: return m_emty_label;
0
226}-
227-
228void QUndoModel::setEmptyLabel(const QString &label)-
229{-
230 m_emty_label = label;-
231 stackChanged();-
232}
never executed: end of block
0
233-
234void QUndoModel::setCleanIcon(const QIcon &icon)-
235{-
236 m_clean_icon = icon;-
237 stackChanged();-
238}
never executed: end of block
0
239-
240QIcon QUndoModel::cleanIcon() const-
241{-
242 return m_clean_icon;
never executed: return m_clean_icon;
0
243}-
244-
245/*!-
246 \class QUndoView-
247 \brief The QUndoView class displays the contents of a QUndoStack.-
248 \since 4.2-
249-
250 \ingroup advanced-
251 \inmodule QtWidgets-
252-
253 QUndoView is a QListView which displays the list of commands pushed on an undo stack.-
254 The most recently executed command is always selected. Selecting a different command-
255 results in a call to QUndoStack::setIndex(), rolling the state of the document-
256 backwards or forward to the new command.-
257-
258 The stack can be set explicitly with setStack(). Alternatively, a QUndoGroup object can-
259 be set with setGroup(). The view will then update itself automatically whenever the-
260 active stack of the group changes.-
261-
262 \image qundoview.png-
263*/-
264-
265class QUndoViewPrivate : public QListViewPrivate-
266{-
267 Q_DECLARE_PUBLIC(QUndoView)-
268public:-
269 QUndoViewPrivate() :-
270#ifndef QT_NO_UNDOGROUP-
271 group(0),-
272#endif-
273 model(0) {}
never executed: end of block
0
274-
275#ifndef QT_NO_UNDOGROUP-
276 QPointer<QUndoGroup> group;-
277#endif-
278 QUndoModel *model;-
279-
280 void init();-
281};-
282-
283void QUndoViewPrivate::init()-
284{-
285 Q_Q(QUndoView);-
286-
287 model = new QUndoModel(q);-
288 q->setModel(model);-
289 q->setSelectionModel(model->selectionModel());-
290}
never executed: end of block
0
291-
292/*!-
293 Constructs a new view with parent \a parent.-
294*/-
295-
296QUndoView::QUndoView(QWidget *parent)-
297 : QListView(*new QUndoViewPrivate(), parent)-
298{-
299 Q_D(QUndoView);-
300 d->init();-
301}
never executed: end of block
0
302-
303/*!-
304 Constructs a new view with parent \a parent and sets the observed stack to \a stack.-
305*/-
306-
307QUndoView::QUndoView(QUndoStack *stack, QWidget *parent)-
308 : QListView(*new QUndoViewPrivate(), parent)-
309{-
310 Q_D(QUndoView);-
311 d->init();-
312 setStack(stack);-
313}
never executed: end of block
0
314-
315#ifndef QT_NO_UNDOGROUP-
316-
317/*!-
318 Constructs a new view with parent \a parent and sets the observed group to \a group.-
319-
320 The view will update itself autmiatically whenever the active stack of the group changes.-
321*/-
322-
323QUndoView::QUndoView(QUndoGroup *group, QWidget *parent)-
324 : QListView(*new QUndoViewPrivate(), parent)-
325{-
326 Q_D(QUndoView);-
327 d->init();-
328 setGroup(group);-
329}
never executed: end of block
0
330-
331#endif // QT_NO_UNDOGROUP-
332-
333/*!-
334 Destroys this view.-
335*/-
336-
337QUndoView::~QUndoView()-
338{-
339}-
340-
341/*!-
342 Returns the stack currently displayed by this view. If the view is looking at a-
343 QUndoGroup, this the group's active stack.-
344-
345 \sa setStack(), setGroup()-
346*/-
347-
348QUndoStack *QUndoView::stack() const-
349{-
350 Q_D(const QUndoView);-
351 return d->model->stack();
never executed: return d->model->stack();
0
352}-
353-
354/*!-
355 Sets the stack displayed by this view to \a stack. If \a stack is 0, the view-
356 will be empty.-
357-
358 If the view was previously looking at a QUndoGroup, the group is set to 0.-
359-
360 \sa stack(), setGroup()-
361*/-
362-
363void QUndoView::setStack(QUndoStack *stack)-
364{-
365 Q_D(QUndoView);-
366#ifndef QT_NO_UNDOGROUP-
367 setGroup(0);-
368#endif-
369 d->model->setStack(stack);-
370}
never executed: end of block
0
371-
372#ifndef QT_NO_UNDOGROUP-
373-
374/*!-
375 Sets the group displayed by this view to \a group. If \a group is 0, the view will-
376 be empty.-
377-
378 The view will update itself autmiatically whenever the active stack of the group changes.-
379-
380 \sa group(), setStack()-
381*/-
382-
383void QUndoView::setGroup(QUndoGroup *group)-
384{-
385 Q_D(QUndoView);-
386-
387 if (d->group == group)
d->group == groupDescription
TRUEnever evaluated
FALSEnever evaluated
0
388 return;
never executed: return;
0
389-
390 if (d->group != 0) {
d->group != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
391 disconnect(d->group, SIGNAL(activeStackChanged(QUndoStack*)),-
392 d->model, SLOT(setStack(QUndoStack*)));-
393 }
never executed: end of block
0
394-
395 d->group = group;-
396-
397 if (d->group != 0) {
d->group != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
398 connect(d->group, SIGNAL(activeStackChanged(QUndoStack*)),-
399 d->model, SLOT(setStack(QUndoStack*)));-
400 d->model->setStack(d->group->activeStack());-
401 } else {
never executed: end of block
0
402 d->model->setStack(0);-
403 }
never executed: end of block
0
404}-
405-
406/*!-
407 Returns the group displayed by this view.-
408-
409 If the view is not looking at group, this function returns 0.-
410-
411 \sa setGroup(), setStack()-
412*/-
413-
414QUndoGroup *QUndoView::group() const-
415{-
416 Q_D(const QUndoView);-
417 return d->group;
never executed: return d->group;
0
418}-
419-
420#endif // QT_NO_UNDOGROUP-
421-
422/*!-
423 \property QUndoView::emptyLabel-
424 \brief the label used for the empty state.-
425-
426 The empty label is the topmost element in the list of commands, which represents-
427 the state of the document before any commands were pushed on the stack. The default-
428 is the string "<empty>".-
429*/-
430-
431void QUndoView::setEmptyLabel(const QString &label)-
432{-
433 Q_D(QUndoView);-
434 d->model->setEmptyLabel(label);-
435}
never executed: end of block
0
436-
437QString QUndoView::emptyLabel() const-
438{-
439 Q_D(const QUndoView);-
440 return d->model->emptyLabel();
never executed: return d->model->emptyLabel();
0
441}-
442-
443/*!-
444 \property QUndoView::cleanIcon-
445 \brief the icon used to represent the clean state.-
446-
447 A stack may have a clean state set with QUndoStack::setClean(). This is usually-
448 the state of the document at the point it was saved. QUndoView can display an-
449 icon in the list of commands to show the clean state. If this property is-
450 a null icon, no icon is shown. The default value is the null icon.-
451*/-
452-
453void QUndoView::setCleanIcon(const QIcon &icon)-
454{-
455 Q_D(const QUndoView);-
456 d->model->setCleanIcon(icon);-
457-
458}
never executed: end of block
0
459-
460QIcon QUndoView::cleanIcon() const-
461{-
462 Q_D(const QUndoView);-
463 return d->model->cleanIcon();
never executed: return d->model->cleanIcon();
0
464}-
465-
466QT_END_NAMESPACE-
467-
468#include "qundoview.moc"-
469#include "moc_qundoview.cpp"-
470-
471#endif // QT_NO_UNDOVIEW-
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