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39
40#ifndef QABSTRACTITEMVIEW_P_H
41#define QABSTRACTITEMVIEW_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtWidgets/private/qtwidgetsglobal_p.h>
55#include "private/qabstractscrollarea_p.h"
56#include "private/qabstractitemmodel_p.h"
57#include "QtWidgets/qapplication.h"
58#include "QtGui/qevent.h"
59#include "QtCore/qmimedata.h"
60#include "QtGui/qpainter.h"
61#include "QtCore/qpair.h"
62#include "QtGui/qregion.h"
63#include "QtCore/qdebug.h"
64#include "QtCore/qbasictimer.h"
65#include "QtCore/qelapsedtimer.h"
66
67QT_REQUIRE_CONFIG(itemviews);
68
69QT_BEGIN_NAMESPACE
70
71struct QEditorInfo {
72 QEditorInfo(QWidget *e, bool s): widget(QPointer<QWidget>(e)), isStatic(s) {}
73 QEditorInfo(): isStatic(false) {}
74
75 QPointer<QWidget> widget;
76 bool isStatic;
77};
78
79// Fast associativity between Persistent editors and indices.
80typedef QHash<QWidget *, QPersistentModelIndex> QEditorIndexHash;
81typedef QHash<QPersistentModelIndex, QEditorInfo> QIndexEditorHash;
82
83struct QItemViewPaintPair {
84 QRect rect;
85 QModelIndex index;
86};
87template <>
88class QTypeInfo<QItemViewPaintPair> : public QTypeInfoMerger<QItemViewPaintPair, QRect, QModelIndex> {};
89
90typedef QVector<QItemViewPaintPair> QItemViewPaintPairs;
91
92class Q_AUTOTEST_EXPORT QAbstractItemViewPrivate : public QAbstractScrollAreaPrivate
93{
94 Q_DECLARE_PUBLIC(QAbstractItemView)
95
96public:
97 QAbstractItemViewPrivate();
98 virtual ~QAbstractItemViewPrivate();
99
100 void init();
101
102 virtual void _q_rowsRemoved(const QModelIndex &parent, int start, int end);
103 virtual void _q_rowsInserted(const QModelIndex &parent, int start, int end);
104 virtual void _q_columnsAboutToBeRemoved(const QModelIndex &parent, int start, int end);
105 virtual void _q_columnsRemoved(const QModelIndex &parent, int start, int end);
106 virtual void _q_columnsInserted(const QModelIndex &parent, int start, int end);
107 virtual void _q_modelDestroyed();
108 virtual void _q_layoutChanged();
109 virtual void _q_rowsMoved(const QModelIndex &source, int sourceStart, int sourceEnd, const QModelIndex &destination, int destinationStart);
110 virtual void _q_columnsMoved(const QModelIndex &source, int sourceStart, int sourceEnd, const QModelIndex &destination, int destinationStart);
111
112 void _q_headerDataChanged() { doDelayedItemsLayout(); }
113 void _q_scrollerStateChanged();
114
115 void fetchMore();
116
117 bool shouldEdit(QAbstractItemView::EditTrigger trigger, const QModelIndex &index) const;
118 bool shouldForwardEvent(QAbstractItemView::EditTrigger trigger, const QEvent *event) const;
119 bool shouldAutoScroll(const QPoint &pos) const;
120 void doDelayedItemsLayout(int delay = 0);
121 void interruptDelayedItemsLayout() const;
122
123 void updateGeometry();
124
125 void startAutoScroll()
126 { // ### it would be nice to make this into a style hint one day
127 int scrollInterval = (verticalScrollMode == QAbstractItemView::ScrollPerItem) ? 150 : 50;
128 autoScrollTimer.start(msec: scrollInterval, obj: q_func());
129 autoScrollCount = 0;
130 }
131 void stopAutoScroll() { autoScrollTimer.stop(); autoScrollCount = 0;}
132
133#if QT_CONFIG(draganddrop)
134 virtual bool dropOn(QDropEvent *event, int *row, int *col, QModelIndex *index);
135#endif
136 bool droppingOnItself(QDropEvent *event, const QModelIndex &index);
137
138 QWidget *editor(const QModelIndex &index, const QStyleOptionViewItem &options);
139 bool sendDelegateEvent(const QModelIndex &index, QEvent *event) const;
140 bool openEditor(const QModelIndex &index, QEvent *event);
141 void updateEditorData(const QModelIndex &topLeft, const QModelIndex &bottomRight);
142
143 QItemSelectionModel::SelectionFlags multiSelectionCommand(const QModelIndex &index,
144 const QEvent *event) const;
145 QItemSelectionModel::SelectionFlags extendedSelectionCommand(const QModelIndex &index,
146 const QEvent *event) const;
147 QItemSelectionModel::SelectionFlags contiguousSelectionCommand(const QModelIndex &index,
148 const QEvent *event) const;
149 virtual void selectAll(QItemSelectionModel::SelectionFlags command);
150
151 void setHoverIndex(const QPersistentModelIndex &index);
152
153 void checkMouseMove(const QPersistentModelIndex &index);
154 inline void checkMouseMove(const QPoint &pos) { checkMouseMove(index: q_func()->indexAt(point: pos)); }
155
156 inline QItemSelectionModel::SelectionFlags selectionBehaviorFlags() const
157 {
158 switch (selectionBehavior) {
159 case QAbstractItemView::SelectRows: return QItemSelectionModel::Rows;
160 case QAbstractItemView::SelectColumns: return QItemSelectionModel::Columns;
161 case QAbstractItemView::SelectItems: default: return QItemSelectionModel::NoUpdate;
162 }
163 }
164
165#if QT_CONFIG(draganddrop)
166 virtual QAbstractItemView::DropIndicatorPosition position(const QPoint &pos, const QRect &rect, const QModelIndex &idx) const;
167
168 inline bool canDrop(QDropEvent *event) {
169 const QMimeData *mime = event->mimeData();
170
171 // Drag enter event shall always be accepted, if mime type and action match.
172 // Whether the data can actually be dropped will be checked in drag move.
173 if (event->type() == QEvent::DragEnter && (event->dropAction() & model->supportedDropActions())) {
174 const QStringList modelTypes = model->mimeTypes();
175 for (const auto &modelType : modelTypes) {
176 if (mime->hasFormat(mimetype: modelType))
177 return true;
178 }
179 }
180
181 QModelIndex index;
182 int col = -1;
183 int row = -1;
184 if (dropOn(event, row: &row, col: &col, index: &index)) {
185 return model->canDropMimeData(data: mime,
186 action: dragDropMode == QAbstractItemView::InternalMove ? Qt::MoveAction : event->dropAction(),
187 row, column: col, parent: index);
188 }
189 return false;
190 }
191
192 inline void paintDropIndicator(QPainter *painter)
193 {
194 if (showDropIndicator && state == QAbstractItemView::DraggingState
195#ifndef QT_NO_CURSOR
196 && viewport->cursor().shape() != Qt::ForbiddenCursor
197#endif
198 ) {
199 QStyleOption opt;
200 opt.init(w: q_func());
201 opt.rect = dropIndicatorRect;
202 q_func()->style()->drawPrimitive(pe: QStyle::PE_IndicatorItemViewItemDrop, opt: &opt, p: painter, w: q_func());
203 }
204 }
205
206#endif
207 virtual QItemViewPaintPairs draggablePaintPairs(const QModelIndexList &indexes, QRect *r) const;
208 // reimplemented in subclasses
209 virtual void adjustViewOptionsForIndex(QStyleOptionViewItem*, const QModelIndex&) const {}
210
211 inline void releaseEditor(QWidget *editor, const QModelIndex &index = QModelIndex()) const {
212 if (editor) {
213 QObject::disconnect(sender: editor, SIGNAL(destroyed(QObject*)),
214 receiver: q_func(), SLOT(editorDestroyed(QObject*)));
215 editor->removeEventFilter(obj: itemDelegate);
216 editor->hide();
217 QAbstractItemDelegate *delegate = delegateForIndex(index);
218
219 if (delegate)
220 delegate->destroyEditor(editor, index);
221 else
222 editor->deleteLater();
223 }
224 }
225
226 inline void executePostedLayout() const {
227 if (delayedPendingLayout && state != QAbstractItemView::CollapsingState) {
228 interruptDelayedItemsLayout();
229 const_cast<QAbstractItemView*>(q_func())->doItemsLayout();
230 }
231 }
232
233 inline void setDirtyRegion(const QRegion &visualRegion) {
234 updateRegion += visualRegion;
235 if (!updateTimer.isActive())
236 updateTimer.start(msec: 0, obj: q_func());
237 }
238
239 inline void scrollDirtyRegion(int dx, int dy) {
240 scrollDelayOffset = QPoint(-dx, -dy);
241 updateDirtyRegion();
242 scrollDelayOffset = QPoint(0, 0);
243 }
244
245 inline void scrollContentsBy(int dx, int dy) {
246 scrollDirtyRegion(dx, dy);
247 viewport->scroll(dx, dy);
248 }
249
250 void updateDirtyRegion() {
251 updateTimer.stop();
252 viewport->update(updateRegion);
253 updateRegion = QRegion();
254 }
255
256 void clearOrRemove();
257 void checkPersistentEditorFocus();
258
259 QPixmap renderToPixmap(const QModelIndexList &indexes, QRect *r) const;
260
261 inline QPoint offset() const {
262 const Q_Q(QAbstractItemView);
263 return QPoint(q->isRightToLeft() ? -q->horizontalOffset()
264 : q->horizontalOffset(), q->verticalOffset());
265 }
266
267 const QEditorInfo &editorForIndex(const QModelIndex &index) const;
268 bool hasEditor(const QModelIndex &index) const;
269
270 QModelIndex indexForEditor(QWidget *editor) const;
271 void addEditor(const QModelIndex &index, QWidget *editor, bool isStatic);
272 void removeEditor(QWidget *editor);
273
274 inline bool isAnimating() const {
275 return state == QAbstractItemView::AnimatingState;
276 }
277
278 inline QAbstractItemDelegate *delegateForIndex(const QModelIndex &index) const {
279 QMap<int, QPointer<QAbstractItemDelegate> >::ConstIterator it;
280
281 it = rowDelegates.find(key: index.row());
282 if (it != rowDelegates.end())
283 return it.value();
284
285 it = columnDelegates.find(key: index.column());
286 if (it != columnDelegates.end())
287 return it.value();
288
289 return itemDelegate;
290 }
291
292 inline bool isIndexValid(const QModelIndex &index) const {
293 return (index.row() >= 0) && (index.column() >= 0) && (index.model() == model);
294 }
295 inline bool isIndexSelectable(const QModelIndex &index) const {
296 return (model->flags(index) & Qt::ItemIsSelectable);
297 }
298 inline bool isIndexEnabled(const QModelIndex &index) const {
299 return (model->flags(index) & Qt::ItemIsEnabled);
300 }
301 inline bool isIndexDropEnabled(const QModelIndex &index) const {
302 return (model->flags(index) & Qt::ItemIsDropEnabled);
303 }
304 inline bool isIndexDragEnabled(const QModelIndex &index) const {
305 return (model->flags(index) & Qt::ItemIsDragEnabled);
306 }
307
308 virtual bool selectionAllowed(const QModelIndex &index) const {
309 // in some views we want to go ahead with selections, even if the index is invalid
310 return isIndexValid(index) && isIndexSelectable(index);
311 }
312
313 // reimplemented from QAbstractScrollAreaPrivate
314 QPoint contentsOffset() const override {
315 Q_Q(const QAbstractItemView);
316 return QPoint(q->horizontalOffset(), q->verticalOffset());
317 }
318
319 /**
320 * For now, assume that we have few editors, if we need a more efficient implementation
321 * we should add a QMap<QAbstractItemDelegate*, int> member.
322 */
323 int delegateRefCount(const QAbstractItemDelegate *delegate) const
324 {
325 int ref = 0;
326 if (itemDelegate == delegate)
327 ++ref;
328
329 for (int maps = 0; maps < 2; ++maps) {
330 const QMap<int, QPointer<QAbstractItemDelegate> > *delegates = maps ? &columnDelegates : &rowDelegates;
331 for (QMap<int, QPointer<QAbstractItemDelegate> >::const_iterator it = delegates->begin();
332 it != delegates->end(); ++it) {
333 if (it.value() == delegate) {
334 ++ref;
335 // optimization, we are only interested in the ref count values 0, 1 or >=2
336 if (ref >= 2) {
337 return ref;
338 }
339 }
340 }
341 }
342 return ref;
343 }
344
345 /**
346 * return true if the index is registered as a QPersistentModelIndex
347 */
348 inline bool isPersistent(const QModelIndex &index) const
349 {
350 return static_cast<QAbstractItemModelPrivate *>(model->d_ptr.data())->persistent.indexes.contains(key: index);
351 }
352
353 QModelIndexList selectedDraggableIndexes() const;
354
355 QStyleOptionViewItem viewOptionsV1() const;
356
357 void doDelayedReset()
358 {
359 //we delay the reset of the timer because some views (QTableView)
360 //with headers can't handle the fact that the model has been destroyed
361 //all _q_modelDestroyed slots must have been called
362 if (!delayedReset.isActive())
363 delayedReset.start(msec: 0, obj: q_func());
364 }
365
366 QAbstractItemModel *model;
367 QPointer<QAbstractItemDelegate> itemDelegate;
368 QMap<int, QPointer<QAbstractItemDelegate> > rowDelegates;
369 QMap<int, QPointer<QAbstractItemDelegate> > columnDelegates;
370 QPointer<QItemSelectionModel> selectionModel;
371 QItemSelectionModel::SelectionFlag ctrlDragSelectionFlag;
372 bool noSelectionOnMousePress;
373
374 QAbstractItemView::SelectionMode selectionMode;
375 QAbstractItemView::SelectionBehavior selectionBehavior;
376
377 QEditorIndexHash editorIndexHash;
378 QIndexEditorHash indexEditorHash;
379 QSet<QWidget*> persistent;
380 QWidget *currentlyCommittingEditor;
381
382 QPersistentModelIndex enteredIndex;
383 QPersistentModelIndex pressedIndex;
384 QPersistentModelIndex currentSelectionStartIndex;
385 Qt::KeyboardModifiers pressedModifiers;
386 QPoint pressedPosition;
387 bool pressedAlreadySelected;
388 bool releaseFromDoubleClick;
389
390 //forces the next mouseMoveEvent to send the viewportEntered signal
391 //if the mouse is over the viewport and not over an item
392 bool viewportEnteredNeeded;
393
394 QAbstractItemView::State state;
395 QAbstractItemView::State stateBeforeAnimation;
396 QAbstractItemView::EditTriggers editTriggers;
397 QAbstractItemView::EditTrigger lastTrigger;
398
399 QPersistentModelIndex root;
400 QPersistentModelIndex hover;
401
402 bool tabKeyNavigation;
403
404#if QT_CONFIG(draganddrop)
405 bool showDropIndicator;
406 QRect dropIndicatorRect;
407 bool dragEnabled;
408 QAbstractItemView::DragDropMode dragDropMode;
409 bool overwrite;
410 bool dropEventMoved;
411 QAbstractItemView::DropIndicatorPosition dropIndicatorPosition;
412 Qt::DropAction defaultDropAction;
413#endif
414
415 QString keyboardInput;
416 QElapsedTimer keyboardInputTime;
417
418 bool autoScroll;
419 QBasicTimer autoScrollTimer;
420 int autoScrollMargin;
421 int autoScrollCount;
422 bool shouldScrollToCurrentOnShow; //used to know if we should scroll to current on show event
423 bool shouldClearStatusTip; //if there is a statustip currently shown that need to be cleared when leaving.
424
425 bool alternatingColors;
426
427 QSize iconSize;
428 Qt::TextElideMode textElideMode;
429
430 QRegion updateRegion; // used for the internal update system
431 QPoint scrollDelayOffset;
432
433 QBasicTimer updateTimer;
434 QBasicTimer delayedEditing;
435 QBasicTimer delayedAutoScroll; //used when an item is clicked
436 QBasicTimer delayedReset;
437
438 QAbstractItemView::ScrollMode verticalScrollMode;
439 QAbstractItemView::ScrollMode horizontalScrollMode;
440
441#ifndef QT_NO_GESTURES
442 // the selection before the last mouse down. In case we have to restore it for scrolling
443 QItemSelection oldSelection;
444 QModelIndex oldCurrent;
445#endif
446
447 bool currentIndexSet;
448
449 bool wrapItemText;
450 mutable bool delayedPendingLayout;
451 bool moveCursorUpdatedView;
452
453 // Whether scroll mode has been explicitly set or its value come from SH_ItemView_ScrollMode
454 bool verticalScrollModeSet;
455 bool horizontalScrollModeSet;
456
457private:
458 mutable QBasicTimer delayedLayout;
459 mutable QBasicTimer fetchMoreTimer;
460};
461
462QT_BEGIN_INCLUDE_NAMESPACE
463#include <qvector.h>
464QT_END_INCLUDE_NAMESPACE
465
466template <typename T>
467inline int qBinarySearch(const QVector<T> &vec, const T &item, int start, int end)
468{
469 int i = (start + end + 1) >> 1;
470 while (end - start > 0) {
471 if (vec.at(i) > item)
472 end = i - 1;
473 else
474 start = i;
475 i = (start + end + 1) >> 1;
476 }
477 return i;
478}
479
480QT_END_NAMESPACE
481
482#endif // QABSTRACTITEMVIEW_P_H
483

source code of qtbase/src/widgets/itemviews/qabstractitemview_p.h