qabstractproxymodel.cpp

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39-
40#include "qabstractproxymodel.h"-
41-
42#ifndef QT_NO_PROXYMODEL-
43-
44#include "qitemselectionmodel.h"-
45#include <private/qabstractproxymodel_p.h>-
46#include <QtCore/QSize>-
47#include <QtCore/QStringList>-
48-
49-
50QT_BEGIN_NAMESPACE-
51-
52/*!-
53 \since 4.1-
54 \class QAbstractProxyModel-
55 \brief The QAbstractProxyModel class provides a base class for proxy item-
56 models that can do sorting, filtering or other data processing tasks.-
57 \ingroup model-view-
58 \inmodule QtCore-
59-
60 This class defines the standard interface that proxy models must use to be-
61 able to interoperate correctly with other model/view components. It is not-
62 supposed to be instantiated directly.-
63-
64 All standard proxy models are derived from the QAbstractProxyModel class.-
65 If you need to create a new proxy model class, it is usually better to-
66 subclass an existing class that provides the closest behavior to the one-
67 you want to provide.-
68-
69 Proxy models that filter or sort items of data from a source model should-
70 be created by using or subclassing QSortFilterProxyModel.-
71-
72 To subclass QAbstractProxyModel, you need to implement mapFromSource() and-
73 mapToSource(). The mapSelectionFromSource() and mapSelectionToSource()-
74 functions only need to be reimplemented if you need a behavior different-
75 from the default behavior.-
76-
77 \note If the source model is deleted or no source model is specified, the-
78 proxy model operates on a empty placeholder model.-
79-
80 \sa QSortFilterProxyModel, QAbstractItemModel, {Model/View Programming}-
81*/-
82-
83/*!-
84 \property QAbstractProxyModel::sourceModel-
85-
86 \brief the source model of this proxy model.-
87*/-
88-
89//detects the deletion of the source model-
90void QAbstractProxyModelPrivate::_q_sourceModelDestroyed()-
91{-
92 invalidatePersistentIndexes();-
93 model = QAbstractItemModelPrivate::staticEmptyModel();-
94}-
95-
96/*!-
97 Constructs a proxy model with the given \a parent.-
98*/-
99-
100QAbstractProxyModel::QAbstractProxyModel(QObject *parent)-
101 :QAbstractItemModel(*new QAbstractProxyModelPrivate, parent)-
102{-
103 setSourceModel(QAbstractItemModelPrivate::staticEmptyModel());-
104}-
105-
106/*!-
107 \internal-
108*/-
109-
110QAbstractProxyModel::QAbstractProxyModel(QAbstractProxyModelPrivate &dd, QObject *parent)-
111 : QAbstractItemModel(dd, parent)-
112{-
113 setSourceModel(QAbstractItemModelPrivate::staticEmptyModel());-
114}-
115-
116/*!-
117 Destroys the proxy model.-
118*/-
119QAbstractProxyModel::~QAbstractProxyModel()-
120{-
121-
122}-
123-
124/*!-
125 Sets the given \a sourceModel to be processed by the proxy model.-
126-
127 Subclasses should call beginResetModel() at the beginning of the method,-
128 disconnect from the old model, call this method, connect to the new model,-
129 and call endResetModel().-
130*/-
131void QAbstractProxyModel::setSourceModel(QAbstractItemModel *sourceModel)-
132{-
133 Q_D(QAbstractProxyModel);-
134 if (sourceModel != d->model) {-
135 if (d->model)-
136 disconnect(d->model, SIGNAL(destroyed()), this, SLOT(_q_sourceModelDestroyed()));-
137-
138 if (sourceModel) {-
139 d->model = sourceModel;-
140 connect(d->model, SIGNAL(destroyed()), this, SLOT(_q_sourceModelDestroyed()));-
141 } else {-
142 d->model = QAbstractItemModelPrivate::staticEmptyModel();-
143 }-
144 d->roleNames = d->model->roleNames();-
145 emit sourceModelChanged(QPrivateSignal());-
146 }-
147}-
148-
149/*!-
150 Clears the roleNames of this proxy model.-
151*/-
152void QAbstractProxyModel::resetInternalData()-
153{-
154 Q_D(QAbstractProxyModel);-
155 d->roleNames = d->model->roleNames();-
156}-
157-
158/*!-
159 Returns the model that contains the data that is available through the proxy model.-
160*/-
161QAbstractItemModel *QAbstractProxyModel::sourceModel() const-
162{-
163 Q_D(const QAbstractProxyModel);-
164 if (d->model == QAbstractItemModelPrivate::staticEmptyModel())-
165 return 0;-
166 return d->model;-
167}-
168-
169/*!-
170 \reimp-
171 */-
172bool QAbstractProxyModel::submit()-
173{-
174 Q_D(QAbstractProxyModel);-
175 return d->model->submit();-
176}-
177-
178/*!-
179 \reimp-
180 */-
181void QAbstractProxyModel::revert()-
182{-
183 Q_D(QAbstractProxyModel);-
184 d->model->revert();-
185}-
186-
187-
188/*!-
189 \fn QModelIndex QAbstractProxyModel::mapToSource(const QModelIndex &proxyIndex) const-
190-
191 Reimplement this function to return the model index in the source model that-
192 corresponds to the \a proxyIndex in the proxy model.-
193-
194 \sa mapFromSource()-
195*/-
196-
197/*!-
198 \fn QModelIndex QAbstractProxyModel::mapFromSource(const QModelIndex &sourceIndex) const-
199-
200 Reimplement this function to return the model index in the proxy model that-
201 corresponds to the \a sourceIndex from the source model.-
202-
203 \sa mapToSource()-
204*/-
205-
206/*!-
207 Returns a source selection mapped from the specified \a proxySelection.-
208-
209 Reimplement this method to map proxy selections to source selections.-
210 */-
211QItemSelection QAbstractProxyModel::mapSelectionToSource(const QItemSelection &proxySelection) const-
212{-
213 QModelIndexList proxyIndexes = proxySelection.indexes();-
214 QItemSelection sourceSelection;-
215 for (int i = 0; i < proxyIndexes.size(); ++i) {-
216 const QModelIndex proxyIdx = mapToSource(proxyIndexes.at(i));-
217 if (!proxyIdx.isValid())-
218 continue;-
219 sourceSelection << QItemSelectionRange(proxyIdx);-
220 }-
221 return sourceSelection;-
222}-
223-
224/*!-
225 Returns a proxy selection mapped from the specified \a sourceSelection.-
226-
227 Reimplement this method to map source selections to proxy selections.-
228*/-
229QItemSelection QAbstractProxyModel::mapSelectionFromSource(const QItemSelection &sourceSelection) const-
230{-
231 QModelIndexList sourceIndexes = sourceSelection.indexes();-
232 QItemSelection proxySelection;-
233 for (int i = 0; i < sourceIndexes.size(); ++i) {-
234 const QModelIndex srcIdx = mapFromSource(sourceIndexes.at(i));-
235 if (!srcIdx.isValid())-
236 continue;-
237 proxySelection << QItemSelectionRange(srcIdx);-
238 }-
239 return proxySelection;-
240}-
241-
242/*!-
243 \reimp-
244 */-
245QVariant QAbstractProxyModel::data(const QModelIndex &proxyIndex, int role) const-
246{-
247 Q_D(const QAbstractProxyModel);-
248 return d->model->data(mapToSource(proxyIndex), role);-
249}-
250-
251/*!-
252 \reimp-
253 */-
254QVariant QAbstractProxyModel::headerData(int section, Qt::Orientation orientation, int role) const-
255{-
256 Q_D(const QAbstractProxyModel);-
257 int sourceSection;-
258 if (orientation == Qt::Horizontal) {-
259 const QModelIndex proxyIndex = index(0, section);-
260 sourceSection = mapToSource(proxyIndex).column();-
261 } else {-
262 const QModelIndex proxyIndex = index(section, 0);-
263 sourceSection = mapToSource(proxyIndex).row();-
264 }-
265 return d->model->headerData(sourceSection, orientation, role);-
266}-
267-
268/*!-
269 \reimp-
270 */-
271QMap<int, QVariant> QAbstractProxyModel::itemData(const QModelIndex &proxyIndex) const-
272{-
273 return QAbstractItemModel::itemData(proxyIndex);-
274}-
275-
276/*!-
277 \reimp-
278 */-
279Qt::ItemFlags QAbstractProxyModel::flags(const QModelIndex &index) const-
280{-
281 Q_D(const QAbstractProxyModel);-
282 return d->model->flags(mapToSource(index));-
283}-
284-
285/*!-
286 \reimp-
287 */-
288bool QAbstractProxyModel::setData(const QModelIndex &index, const QVariant &value, int role)-
289{-
290 Q_D(QAbstractProxyModel);-
291 return d->model->setData(mapToSource(index), value, role);-
292}-
293-
294/*!-
295 \reimp-
296 */-
297bool QAbstractProxyModel::setItemData(const QModelIndex &index, const QMap< int, QVariant >& roles)-
298{-
299 return QAbstractItemModel::setItemData(index, roles);-
300}-
301-
302/*!-
303 \reimp-
304 */-
305bool QAbstractProxyModel::setHeaderData(int section, Qt::Orientation orientation, const QVariant &value, int role)-
306{-
307 Q_D(QAbstractProxyModel);-
308 int sourceSection;-
309 if (orientation == Qt::Horizontal) {-
310 const QModelIndex proxyIndex = index(0, section);-
311 sourceSection = mapToSource(proxyIndex).column();-
312 } else {-
313 const QModelIndex proxyIndex = index(section, 0);-
314 sourceSection = mapToSource(proxyIndex).row();-
315 }-
316 return d->model->setHeaderData(sourceSection, orientation, value, role);-
317}-
318-
319/*!-
320 \reimp-
321 */-
322QModelIndex QAbstractProxyModel::buddy(const QModelIndex &index) const-
323{-
324 Q_D(const QAbstractProxyModel);-
325 return mapFromSource(d->model->buddy(mapToSource(index)));-
326}-
327-
328/*!-
329 \reimp-
330 */-
331bool QAbstractProxyModel::canFetchMore(const QModelIndex &parent) const-
332{-
333 Q_D(const QAbstractProxyModel);-
334 return d->model->canFetchMore(mapToSource(parent));-
335}-
336-
337/*!-
338 \reimp-
339 */-
340void QAbstractProxyModel::fetchMore(const QModelIndex &parent)-
341{-
342 Q_D(QAbstractProxyModel);-
343 d->model->fetchMore(mapToSource(parent));-
344}-
345-
346/*!-
347 \reimp-
348 */-
349void QAbstractProxyModel::sort(int column, Qt::SortOrder order)-
350{-
351 Q_D(QAbstractProxyModel);-
352 d->model->sort(column, order);-
353}-
354-
355/*!-
356 \reimp-
357 */-
358QSize QAbstractProxyModel::span(const QModelIndex &index) const-
359{-
360 Q_D(const QAbstractProxyModel);-
361 return d->model->span(mapToSource(index));-
362}-
363-
364/*!-
365 \reimp-
366 */-
367bool QAbstractProxyModel::hasChildren(const QModelIndex &parent) const-
368{-
369 Q_D(const QAbstractProxyModel);-
370 return d->model->hasChildren(mapToSource(parent));-
371}-
372-
373/*!-
374 \reimp-
375 */-
376QModelIndex QAbstractProxyModel::sibling(int row, int column, const QModelIndex &idx) const-
377{-
378 return index(row, column, idx.parent());-
379}-
380-
381/*!-
382 \reimp-
383 */-
384QMimeData* QAbstractProxyModel::mimeData(const QModelIndexList &indexes) const-
385{-
386 Q_D(const QAbstractProxyModel);-
387 QModelIndexList list;-
388 list.reserve(indexes.count());-
389 foreachfor (const QModelIndex &index ,: indexes)-
390 list << mapToSource(index);
never executed: list << mapToSource(index);
0
391 return d->model->mimeData(list);
never executed: return d->model->mimeData(list);
0
392}-
393-
394void QAbstractProxyModelPrivate::mapDropCoordinatesToSource(int row, int column, const QModelIndex &parent,-
395 int *sourceRow, int *sourceColumn, QModelIndex *sourceParent) const-
396{-
397 Q_Q(const QAbstractProxyModel);-
398 *sourceRow = -1;-
399 *sourceColumn = -1;-
400 if (row == -1 && column == -1) {-
401 *sourceParent = q->mapToSource(parent);-
402 } else if (row == q->rowCount(parent)) {-
403 *sourceParent = q->mapToSource(parent);-
404 *sourceRow = model->rowCount(*sourceParent);-
405 } else {-
406 QModelIndex proxyIndex = q->index(row, column, parent);-
407 QModelIndex sourceIndex = q->mapToSource(proxyIndex);-
408 *sourceRow = sourceIndex.row();-
409 *sourceColumn = sourceIndex.column();-
410 *sourceParent = sourceIndex.parent();-
411 }-
412}-
413-
414/*!-
415 \reimp-
416 \since 5.4-
417 */-
418bool QAbstractProxyModel::canDropMimeData(const QMimeData *data, Qt::DropAction action,-
419 int row, int column, const QModelIndex &parent) const-
420{-
421 Q_D(const QAbstractProxyModel);-
422 int sourceDestinationRow;-
423 int sourceDestinationColumn;-
424 QModelIndex sourceParent;-
425 d->mapDropCoordinatesToSource(row, column, parent, &sourceDestinationRow, &sourceDestinationColumn, &sourceParent);-
426 return d->model->canDropMimeData(data, action, sourceDestinationRow, sourceDestinationColumn, sourceParent);-
427}-
428-
429/*!-
430 \reimp-
431 \since 5.4-
432 */-
433bool QAbstractProxyModel::dropMimeData(const QMimeData *data, Qt::DropAction action,-
434 int row, int column, const QModelIndex &parent)-
435{-
436 Q_D(QAbstractProxyModel);-
437 int sourceDestinationRow;-
438 int sourceDestinationColumn;-
439 QModelIndex sourceParent;-
440 d->mapDropCoordinatesToSource(row, column, parent, &sourceDestinationRow, &sourceDestinationColumn, &sourceParent);-
441 return d->model->dropMimeData(data, action, sourceDestinationRow, sourceDestinationColumn, sourceParent);-
442}-
443-
444/*!-
445 \reimp-
446 */-
447QStringList QAbstractProxyModel::mimeTypes() const-
448{-
449 Q_D(const QAbstractProxyModel);-
450 return d->model->mimeTypes();-
451}-
452-
453/*!-
454 \reimp-
455 */-
456Qt::DropActions QAbstractProxyModel::supportedDragActions() const-
457{-
458 Q_D(const QAbstractProxyModel);-
459 return d->model->supportedDragActions();-
460}-
461-
462/*!-
463 \reimp-
464 */-
465Qt::DropActions QAbstractProxyModel::supportedDropActions() const-
466{-
467 Q_D(const QAbstractProxyModel);-
468 return d->model->supportedDropActions();-
469}-
470-
471QT_END_NAMESPACE-
472-
473#include "moc_qabstractproxymodel.cpp"-
474-
475#endif // QT_NO_PROXYMODEL-
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