1 | // Copyright (C) 2016 The Qt Company Ltd. |
---|---|
2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
3 | |
4 | #include "private/qgesturemanager_p.h" |
5 | #include "private/qstandardgestures_p.h" |
6 | #include "private/qwidget_p.h" |
7 | #include "private/qgesture_p.h" |
8 | #if QT_CONFIG(graphicsview) |
9 | #include "private/qgraphicsitem_p.h" |
10 | #include "qgraphicsitem.h" |
11 | #endif |
12 | #include "private/qevent_p.h" |
13 | #include "private/qapplication_p.h" |
14 | #include "private/qwidgetwindow_p.h" |
15 | #include "qgesture.h" |
16 | #include "qevent.h" |
17 | |
18 | #ifdef Q_OS_MACOS |
19 | #include "qmacgesturerecognizer_p.h" |
20 | #endif |
21 | |
22 | #include "qdebug.h" |
23 | #include <QtCore/QLoggingCategory> |
24 | #include <QtCore/QVarLengthArray> |
25 | |
26 | #ifndef QT_NO_GESTURES |
27 | |
28 | QT_BEGIN_NAMESPACE |
29 | |
30 | Q_LOGGING_CATEGORY(lcGestureManager, "qt.widgets.gestures") |
31 | |
32 | #if !defined(Q_OS_MACOS) |
33 | static inline int panTouchPoints() |
34 | { |
35 | // Override by environment variable for testing. |
36 | static const char panTouchPointVariable[] = "QT_PAN_TOUCHPOINTS"; |
37 | if (qEnvironmentVariableIsSet(varName: panTouchPointVariable)) { |
38 | bool ok; |
39 | const int result = qEnvironmentVariableIntValue(varName: panTouchPointVariable, ok: &ok); |
40 | if (ok && result >= 1) |
41 | return result; |
42 | qWarning(msg: "Ignoring invalid value of %s", panTouchPointVariable); |
43 | } |
44 | // Pan should use 1 finger on a touch screen and 2 fingers on touch pads etc. |
45 | // where 1 finger movements are used for mouse event synthetization. For now, |
46 | // default to 2 until all classes inheriting QScrollArea are fixed to handle it |
47 | // correctly. |
48 | return 2; |
49 | } |
50 | #endif |
51 | |
52 | QGestureManager::QGestureManager(QObject *parent) |
53 | : QObject(parent), m_lastCustomGestureId(Qt::CustomGesture) |
54 | { |
55 | qRegisterMetaType<Qt::GestureState>(); |
56 | |
57 | #if defined(Q_OS_MACOS) |
58 | registerGestureRecognizer(new QMacSwipeGestureRecognizer); |
59 | registerGestureRecognizer(new QMacPinchGestureRecognizer); |
60 | registerGestureRecognizer(new QMacPanGestureRecognizer); |
61 | #else |
62 | registerGestureRecognizer(recognizer: new QPanGestureRecognizer(panTouchPoints())); |
63 | registerGestureRecognizer(recognizer: new QPinchGestureRecognizer); |
64 | registerGestureRecognizer(recognizer: new QSwipeGestureRecognizer); |
65 | registerGestureRecognizer(recognizer: new QTapGestureRecognizer); |
66 | #endif |
67 | registerGestureRecognizer(recognizer: new QTapAndHoldGestureRecognizer); |
68 | } |
69 | |
70 | QGestureManager::~QGestureManager() |
71 | { |
72 | qDeleteAll(c: m_recognizers); |
73 | for (auto it = m_obsoleteGestures.cbegin(), end = m_obsoleteGestures.cend(); it != end; ++it) { |
74 | qDeleteAll(c: it.value()); |
75 | delete it.key(); |
76 | } |
77 | } |
78 | |
79 | Qt::GestureType QGestureManager::registerGestureRecognizer(QGestureRecognizer *recognizer) |
80 | { |
81 | const QScopedPointer<QGesture> dummy(recognizer->create(target: nullptr)); |
82 | if (Q_UNLIKELY(!dummy)) { |
83 | qWarning(msg: "QGestureManager::registerGestureRecognizer: " |
84 | "the recognizer fails to create a gesture object, skipping registration."); |
85 | return Qt::GestureType(0); |
86 | } |
87 | Qt::GestureType type = dummy->gestureType(); |
88 | if (type == Qt::CustomGesture) { |
89 | // generate a new custom gesture id |
90 | ++m_lastCustomGestureId; |
91 | type = Qt::GestureType(m_lastCustomGestureId); |
92 | } |
93 | m_recognizers.insert(key: type, value: recognizer); |
94 | return type; |
95 | } |
96 | |
97 | void QGestureManager::unregisterGestureRecognizer(Qt::GestureType type) |
98 | { |
99 | QList<QGestureRecognizer *> list = m_recognizers.values(key: type); |
100 | m_recognizers.remove(key: type); |
101 | for (const auto &[g, recognizer] : std::as_const(t&: m_gestureToRecognizer).asKeyValueRange()) { |
102 | if (list.contains(t: recognizer)) { |
103 | m_deletedRecognizers.insert(key: g, value: recognizer); |
104 | } |
105 | } |
106 | |
107 | for (const auto &[objectGesture, gestures] : std::as_const(t&: m_objectGestures).asKeyValueRange()) { |
108 | if (objectGesture.gesture == type) { |
109 | for (QGesture *g : gestures) { |
110 | auto it = m_gestureToRecognizer.constFind(key: g); |
111 | if (it != m_gestureToRecognizer.cend() && it.value()) { |
112 | QGestureRecognizer *recognizer = it.value(); |
113 | m_gestureToRecognizer.erase(it); |
114 | m_obsoleteGestures[recognizer].insert(value: g); |
115 | } |
116 | } |
117 | } |
118 | } |
119 | } |
120 | |
121 | void QGestureManager::cleanupCachedGestures(QObject *target, Qt::GestureType type) |
122 | { |
123 | const auto iter = m_objectGestures.find(key: {target, type}); |
124 | if (iter == m_objectGestures.end()) |
125 | return; |
126 | |
127 | const QList<QGesture *> &gestures = iter.value(); |
128 | for (auto &e : m_obsoleteGestures) { |
129 | for (QGesture *g : gestures) |
130 | e -= g; |
131 | } |
132 | for (QGesture *g : gestures) { |
133 | m_deletedRecognizers.remove(key: g); |
134 | m_gestureToRecognizer.remove(key: g); |
135 | m_maybeGestures.remove(value: g); |
136 | m_activeGestures.remove(value: g); |
137 | m_gestureOwners.remove(key: g); |
138 | m_gestureTargets.remove(key: g); |
139 | m_gesturesToDelete.insert(value: g); |
140 | } |
141 | |
142 | m_objectGestures.erase(it: iter); |
143 | } |
144 | |
145 | // get or create a QGesture object that will represent the state for a given object, used by the recognizer |
146 | QGesture *QGestureManager::getState(QObject *object, QGestureRecognizer *recognizer, Qt::GestureType type) |
147 | { |
148 | // if the widget is being deleted we should be careful not to |
149 | // create a new state, as it will create QWeakPointer which doesn't work |
150 | // from the destructor. |
151 | if (object->isWidgetType()) { |
152 | if (static_cast<QWidget *>(object)->d_func()->data.in_destructor) |
153 | return nullptr; |
154 | } else if (QGesture *g = qobject_cast<QGesture *>(object)) { |
155 | return g; |
156 | #if QT_CONFIG(graphicsview) |
157 | } else { |
158 | Q_ASSERT(qobject_cast<QGraphicsObject *>(object)); |
159 | QGraphicsObject *graphicsObject = static_cast<QGraphicsObject *>(object); |
160 | if (graphicsObject->QGraphicsItem::d_func()->inDestructor) |
161 | return nullptr; |
162 | #endif |
163 | } |
164 | |
165 | // check if the QGesture for this recognizer has already been created |
166 | const auto states = m_objectGestures.value(key: QGestureManager::ObjectGesture(object, type)); |
167 | for (QGesture *state : states) { |
168 | if (m_gestureToRecognizer.value(key: state) == recognizer) |
169 | return state; |
170 | } |
171 | |
172 | Q_ASSERT(recognizer); |
173 | QGesture *state = recognizer->create(target: object); |
174 | if (!state) |
175 | return nullptr; |
176 | state->setParent(this); |
177 | if (state->gestureType() == Qt::CustomGesture) { |
178 | // if the recognizer didn't fill in the gesture type, then this |
179 | // is a custom gesture with autogenerated id and we fill it. |
180 | state->d_func()->gestureType = type; |
181 | if (lcGestureManager().isDebugEnabled()) |
182 | state->setObjectName(QString::number((int)type)); |
183 | } |
184 | m_objectGestures[QGestureManager::ObjectGesture(object, type)].append(t: state); |
185 | m_gestureToRecognizer[state] = recognizer; |
186 | m_gestureOwners[state] = object; |
187 | |
188 | return state; |
189 | } |
190 | |
191 | static bool logIgnoredEvent(QEvent::Type t) |
192 | { |
193 | bool result = false; |
194 | switch (t) { |
195 | case QEvent::MouseButtonPress: |
196 | case QEvent::MouseButtonRelease: |
197 | case QEvent::MouseButtonDblClick: |
198 | case QEvent::MouseMove: |
199 | case QEvent::TouchBegin: |
200 | case QEvent::TouchUpdate: |
201 | case QEvent::TouchCancel: |
202 | case QEvent::TouchEnd: |
203 | case QEvent::TabletEnterProximity: |
204 | case QEvent::TabletLeaveProximity: |
205 | case QEvent::TabletMove: |
206 | case QEvent::TabletPress: |
207 | case QEvent::TabletRelease: |
208 | case QEvent::GraphicsSceneMouseDoubleClick: |
209 | case QEvent::GraphicsSceneMousePress: |
210 | case QEvent::GraphicsSceneMouseRelease: |
211 | case QEvent::GraphicsSceneMouseMove: |
212 | result = true; |
213 | break; |
214 | default: |
215 | break; |
216 | |
217 | } |
218 | return result; |
219 | } |
220 | |
221 | bool QGestureManager::filterEventThroughContexts(const QMultiMap<QObject *, |
222 | Qt::GestureType> &contexts, |
223 | QEvent *event) |
224 | { |
225 | QSet<QGesture *> triggeredGestures; |
226 | QSet<QGesture *> finishedGestures; |
227 | QSet<QGesture *> newMaybeGestures; |
228 | QSet<QGesture *> notGestures; |
229 | |
230 | // TODO: sort contexts by the gesture type and check if one of the contexts |
231 | // is already active. |
232 | |
233 | bool consumeEventHint = false; |
234 | |
235 | // filter the event through recognizers |
236 | typedef QMultiMap<QObject *, Qt::GestureType>::const_iterator ContextIterator; |
237 | ContextIterator contextEnd = contexts.end(); |
238 | for (ContextIterator context = contexts.begin(); context != contextEnd; ++context) { |
239 | Qt::GestureType gestureType = context.value(); |
240 | const QMultiMap<Qt::GestureType, QGestureRecognizer *> &const_recognizers = m_recognizers; |
241 | QMultiMap<Qt::GestureType, QGestureRecognizer *>::const_iterator |
242 | typeToRecognizerIterator = const_recognizers.lowerBound(key: gestureType), |
243 | typeToRecognizerEnd = const_recognizers.upperBound(key: gestureType); |
244 | for (; typeToRecognizerIterator != typeToRecognizerEnd; ++typeToRecognizerIterator) { |
245 | QGestureRecognizer *recognizer = typeToRecognizerIterator.value(); |
246 | QObject *target = context.key(); |
247 | QGesture *state = getState(object: target, recognizer, type: gestureType); |
248 | if (!state) |
249 | continue; |
250 | QGestureRecognizer::Result recognizerResult = recognizer->recognize(state, watched: target, event); |
251 | QGestureRecognizer::Result recognizerState = recognizerResult & QGestureRecognizer::ResultState_Mask; |
252 | QGestureRecognizer::Result resultHint = recognizerResult & QGestureRecognizer::ResultHint_Mask; |
253 | if (recognizerState == QGestureRecognizer::TriggerGesture) { |
254 | qCDebug(lcGestureManager) << "QGestureManager:Recognizer: gesture triggered: "<< state << event; |
255 | triggeredGestures << state; |
256 | } else if (recognizerState == QGestureRecognizer::FinishGesture) { |
257 | qCDebug(lcGestureManager) << "QGestureManager:Recognizer: gesture finished: "<< state << event; |
258 | finishedGestures << state; |
259 | } else if (recognizerState == QGestureRecognizer::MayBeGesture) { |
260 | qCDebug(lcGestureManager) << "QGestureManager:Recognizer: maybe gesture: "<< state << event; |
261 | newMaybeGestures << state; |
262 | } else if (recognizerState == QGestureRecognizer::CancelGesture) { |
263 | qCDebug(lcGestureManager) << "QGestureManager:Recognizer: not gesture: "<< state << event; |
264 | notGestures << state; |
265 | } else if (recognizerState == QGestureRecognizer::Ignore) { |
266 | if (logIgnoredEvent(t: event->type())) |
267 | qCDebug(lcGestureManager) << "QGestureManager:Recognizer: ignored the event: "<< state << event; |
268 | } else { |
269 | if (logIgnoredEvent(t: event->type())) { |
270 | qCDebug(lcGestureManager) << "QGestureManager:Recognizer: hm, lets assume the recognizer" |
271 | << "ignored the event: "<< state << event; |
272 | } |
273 | } |
274 | if (resultHint & QGestureRecognizer::ConsumeEventHint) { |
275 | qCDebug(lcGestureManager) << "QGestureManager: we were asked to consume the event: " |
276 | << state << event; |
277 | consumeEventHint = true; |
278 | } |
279 | } |
280 | } |
281 | if (!triggeredGestures.isEmpty() || !finishedGestures.isEmpty() |
282 | || !newMaybeGestures.isEmpty() || !notGestures.isEmpty()) { |
283 | const QSet<QGesture *> startedGestures = triggeredGestures - m_activeGestures; |
284 | triggeredGestures &= m_activeGestures; |
285 | |
286 | // check if a running gesture switched back to maybe state |
287 | const QSet<QGesture *> activeToMaybeGestures = m_activeGestures & newMaybeGestures; |
288 | |
289 | // check if a maybe gesture switched to canceled - reset it but don't send an event |
290 | QSet<QGesture *> maybeToCanceledGestures = m_maybeGestures & notGestures; |
291 | |
292 | // check if a running gesture switched back to not gesture state, |
293 | // i.e. were canceled |
294 | const QSet<QGesture *> canceledGestures = m_activeGestures & notGestures; |
295 | |
296 | // new gestures in maybe state |
297 | m_maybeGestures += newMaybeGestures; |
298 | |
299 | // gestures that were in maybe state |
300 | QSet<QGesture *> notMaybeGestures = (startedGestures | triggeredGestures |
301 | | finishedGestures | canceledGestures |
302 | | notGestures); |
303 | m_maybeGestures -= notMaybeGestures; |
304 | |
305 | Q_ASSERT((startedGestures & finishedGestures).isEmpty()); |
306 | Q_ASSERT((startedGestures & newMaybeGestures).isEmpty()); |
307 | Q_ASSERT((startedGestures & canceledGestures).isEmpty()); |
308 | Q_ASSERT((finishedGestures & newMaybeGestures).isEmpty()); |
309 | Q_ASSERT((finishedGestures & canceledGestures).isEmpty()); |
310 | Q_ASSERT((canceledGestures & newMaybeGestures).isEmpty()); |
311 | |
312 | const QSet<QGesture *> notStarted = finishedGestures - m_activeGestures; |
313 | if (!notStarted.isEmpty()) { |
314 | // there are some gestures that claim to be finished, but never started. |
315 | // probably those are "singleshot" gestures so we'll fake the started state. |
316 | for (QGesture *gesture : notStarted) |
317 | gesture->d_func()->state = Qt::GestureStarted; |
318 | QSet<QGesture *> undeliveredGestures; |
319 | deliverEvents(gestures: notStarted, undeliveredGestures: &undeliveredGestures); |
320 | finishedGestures -= undeliveredGestures; |
321 | } |
322 | |
323 | m_activeGestures += startedGestures; |
324 | // sanity check: all triggered gestures should already be in active gestures list |
325 | Q_ASSERT((m_activeGestures & triggeredGestures).size() == triggeredGestures.size()); |
326 | m_activeGestures -= finishedGestures; |
327 | m_activeGestures -= activeToMaybeGestures; |
328 | m_activeGestures -= canceledGestures; |
329 | |
330 | // set the proper gesture state on each gesture |
331 | for (QGesture *gesture : startedGestures) |
332 | gesture->d_func()->state = Qt::GestureStarted; |
333 | for (QGesture *gesture : std::as_const(t&: triggeredGestures)) |
334 | gesture->d_func()->state = Qt::GestureUpdated; |
335 | for (QGesture *gesture : std::as_const(t&: finishedGestures)) |
336 | gesture->d_func()->state = Qt::GestureFinished; |
337 | for (QGesture *gesture : canceledGestures) |
338 | gesture->d_func()->state = Qt::GestureCanceled; |
339 | for (QGesture *gesture : activeToMaybeGestures) |
340 | gesture->d_func()->state = Qt::GestureFinished; |
341 | |
342 | if (!m_activeGestures.isEmpty() || !m_maybeGestures.isEmpty() || |
343 | !startedGestures.isEmpty() || !triggeredGestures.isEmpty() || |
344 | !finishedGestures.isEmpty() || !canceledGestures.isEmpty()) { |
345 | qCDebug(lcGestureManager) << "QGestureManager::filterEventThroughContexts:" |
346 | << "\n\tactiveGestures:"<< m_activeGestures |
347 | << "\n\tmaybeGestures:"<< m_maybeGestures |
348 | << "\n\tstarted:"<< startedGestures |
349 | << "\n\ttriggered:"<< triggeredGestures |
350 | << "\n\tfinished:"<< finishedGestures |
351 | << "\n\tcanceled:"<< canceledGestures |
352 | << "\n\tmaybe-canceled:"<< maybeToCanceledGestures; |
353 | } |
354 | |
355 | QSet<QGesture *> undeliveredGestures; |
356 | deliverEvents(gestures: startedGestures+triggeredGestures+finishedGestures+canceledGestures, |
357 | undeliveredGestures: &undeliveredGestures); |
358 | |
359 | for (QGesture *g : startedGestures) { |
360 | if (undeliveredGestures.contains(value: g)) |
361 | continue; |
362 | if (g->gestureCancelPolicy() == QGesture::CancelAllInContext) { |
363 | qCDebug(lcGestureManager) << "lets try to cancel some"; |
364 | // find gestures in context in Qt::GestureStarted or Qt::GestureUpdated state and cancel them |
365 | cancelGesturesForChildren(originatingGesture: g); |
366 | } |
367 | } |
368 | |
369 | m_activeGestures -= undeliveredGestures; |
370 | |
371 | // reset gestures that ended |
372 | const QSet<QGesture *> endedGestures = |
373 | finishedGestures + canceledGestures + undeliveredGestures + maybeToCanceledGestures; |
374 | for (QGesture *gesture : endedGestures) { |
375 | recycle(gesture); |
376 | m_gestureTargets.remove(key: gesture); |
377 | } |
378 | } |
379 | //Clean up the Gestures |
380 | qDeleteAll(c: m_gesturesToDelete); |
381 | m_gesturesToDelete.clear(); |
382 | |
383 | return consumeEventHint; |
384 | } |
385 | |
386 | // Cancel all gestures of children of the widget that original is associated with |
387 | void QGestureManager::cancelGesturesForChildren(QGesture *original) |
388 | { |
389 | Q_ASSERT(original); |
390 | QWidget *originatingWidget = m_gestureTargets.value(key: original); |
391 | Q_ASSERT(originatingWidget); |
392 | if (!originatingWidget) |
393 | return; |
394 | |
395 | // iterate over all active gestures and all maybe gestures |
396 | // for each find the owner |
397 | // if the owner is part of our sub-hierarchy, cancel it. |
398 | |
399 | QSet<QGesture*> cancelledGestures; |
400 | QSet<QGesture*>::Iterator iter = m_activeGestures.begin(); |
401 | while (iter != m_activeGestures.end()) { |
402 | QWidget *widget = m_gestureTargets.value(key: *iter); |
403 | // note that we don't touch the gestures for our originatingWidget |
404 | if (widget != originatingWidget && originatingWidget->isAncestorOf(child: widget)) { |
405 | qCDebug(lcGestureManager) << " found a gesture to cancel"<< (*iter); |
406 | (*iter)->d_func()->state = Qt::GestureCanceled; |
407 | cancelledGestures << *iter; |
408 | iter = m_activeGestures.erase(i: iter); |
409 | } else { |
410 | ++iter; |
411 | } |
412 | } |
413 | |
414 | // TODO handle 'maybe' gestures too |
415 | |
416 | // sort them per target widget by cherry picking from almostCanceledGestures and delivering |
417 | QSet<QGesture *> almostCanceledGestures = cancelledGestures; |
418 | while (!almostCanceledGestures.isEmpty()) { |
419 | QWidget *target = nullptr; |
420 | QSet<QGesture*> gestures; |
421 | iter = almostCanceledGestures.begin(); |
422 | // sort per target widget |
423 | while (iter != almostCanceledGestures.end()) { |
424 | QWidget *widget = m_gestureTargets.value(key: *iter); |
425 | if (target == nullptr) |
426 | target = widget; |
427 | if (target == widget) { |
428 | gestures << *iter; |
429 | iter = almostCanceledGestures.erase(i: iter); |
430 | } else { |
431 | ++iter; |
432 | } |
433 | } |
434 | Q_ASSERT(target); |
435 | |
436 | QSet<QGesture*> undeliveredGestures; |
437 | deliverEvents(gestures, undeliveredGestures: &undeliveredGestures); |
438 | } |
439 | |
440 | for (iter = cancelledGestures.begin(); iter != cancelledGestures.end(); ++iter) |
441 | recycle(gesture: *iter); |
442 | } |
443 | |
444 | void QGestureManager::cleanupGesturesForRemovedRecognizer(QGesture *gesture) |
445 | { |
446 | QGestureRecognizer *recognizer = m_deletedRecognizers.value(key: gesture); |
447 | if (!recognizer) //The Gesture is removed while in the even loop, so the recognizers for this gestures was removed |
448 | return; |
449 | m_deletedRecognizers.remove(key: gesture); |
450 | if (m_deletedRecognizers.keys(value: recognizer).isEmpty()) { |
451 | // no more active gestures, cleanup! |
452 | qDeleteAll(c: m_obsoleteGestures.value(key: recognizer)); |
453 | m_obsoleteGestures.remove(key: recognizer); |
454 | delete recognizer; |
455 | } |
456 | } |
457 | |
458 | // return true if accepted (consumed) |
459 | bool QGestureManager::filterEvent(QWidget *receiver, QEvent *event) |
460 | { |
461 | QVarLengthArray<Qt::GestureType, 16> types; |
462 | QMultiMap<QObject *, Qt::GestureType> contexts; |
463 | QWidget *w = receiver; |
464 | typedef QMap<Qt::GestureType, Qt::GestureFlags>::const_iterator ContextIterator; |
465 | if (!w->d_func()->gestureContext.isEmpty()) { |
466 | for(ContextIterator it = w->d_func()->gestureContext.constBegin(), |
467 | e = w->d_func()->gestureContext.constEnd(); it != e; ++it) { |
468 | types.push_back(t: it.key()); |
469 | contexts.insert(key: w, value: it.key()); |
470 | } |
471 | } |
472 | // find all gesture contexts for the widget tree |
473 | w = w->isWindow() ? nullptr : w->parentWidget(); |
474 | while (w) |
475 | { |
476 | for (ContextIterator it = w->d_func()->gestureContext.constBegin(), |
477 | e = w->d_func()->gestureContext.constEnd(); it != e; ++it) { |
478 | if (!(it.value() & Qt::DontStartGestureOnChildren)) { |
479 | if (!types.contains(t: it.key())) { |
480 | types.push_back(t: it.key()); |
481 | contexts.insert(key: w, value: it.key()); |
482 | } |
483 | } |
484 | } |
485 | if (w->isWindow()) |
486 | break; |
487 | w = w->parentWidget(); |
488 | } |
489 | return contexts.isEmpty() ? false : filterEventThroughContexts(contexts, event); |
490 | } |
491 | |
492 | #if QT_CONFIG(graphicsview) |
493 | bool QGestureManager::filterEvent(QGraphicsObject *receiver, QEvent *event) |
494 | { |
495 | QVarLengthArray<Qt::GestureType, 16> types; |
496 | QMultiMap<QObject *, Qt::GestureType> contexts; |
497 | QGraphicsObject *item = receiver; |
498 | if (!item->QGraphicsItem::d_func()->gestureContext.isEmpty()) { |
499 | typedef QMap<Qt::GestureType, Qt::GestureFlags>::const_iterator ContextIterator; |
500 | for(ContextIterator it = item->QGraphicsItem::d_func()->gestureContext.constBegin(), |
501 | e = item->QGraphicsItem::d_func()->gestureContext.constEnd(); it != e; ++it) { |
502 | types.push_back(t: it.key()); |
503 | contexts.insert(key: item, value: it.key()); |
504 | } |
505 | } |
506 | // find all gesture contexts for the graphics object tree |
507 | item = item->parentObject(); |
508 | while (item) |
509 | { |
510 | typedef QMap<Qt::GestureType, Qt::GestureFlags>::const_iterator ContextIterator; |
511 | for (ContextIterator it = item->QGraphicsItem::d_func()->gestureContext.constBegin(), |
512 | e = item->QGraphicsItem::d_func()->gestureContext.constEnd(); it != e; ++it) { |
513 | if (!(it.value() & Qt::DontStartGestureOnChildren)) { |
514 | if (!types.contains(t: it.key())) { |
515 | types.push_back(t: it.key()); |
516 | contexts.insert(key: item, value: it.key()); |
517 | } |
518 | } |
519 | } |
520 | item = item->parentObject(); |
521 | } |
522 | return contexts.isEmpty() ? false : filterEventThroughContexts(contexts, event); |
523 | } |
524 | #endif |
525 | |
526 | bool QGestureManager::filterEvent(QObject *receiver, QEvent *event) |
527 | { |
528 | // if the receiver is actually a widget, we need to call the correct event |
529 | // filter method. |
530 | QWidgetWindow *widgetWindow = qobject_cast<QWidgetWindow *>(object: receiver); |
531 | |
532 | if (widgetWindow && widgetWindow->widget()) |
533 | return filterEvent(receiver: widgetWindow->widget(), event); |
534 | |
535 | QGesture *state = qobject_cast<QGesture *>(object: receiver); |
536 | if (!state || !m_gestureToRecognizer.contains(key: state)) |
537 | return false; |
538 | QMultiMap<QObject *, Qt::GestureType> contexts; |
539 | contexts.insert(key: state, value: state->gestureType()); |
540 | return filterEventThroughContexts(contexts, event); |
541 | } |
542 | |
543 | void QGestureManager::getGestureTargets(const QSet<QGesture*> &gestures, |
544 | QHash<QWidget *, QList<QGesture *> > *conflicts, |
545 | QHash<QWidget *, QList<QGesture *> > *normal) |
546 | { |
547 | typedef QHash<Qt::GestureType, QHash<QWidget *, QGesture *> > GestureByTypes; |
548 | GestureByTypes gestureByTypes; |
549 | |
550 | // sort gestures by types |
551 | for (QGesture *gesture : gestures) { |
552 | QWidget *receiver = m_gestureTargets.value(key: gesture, defaultValue: nullptr); |
553 | Q_ASSERT(receiver); |
554 | if (receiver) |
555 | gestureByTypes[gesture->gestureType()].insert(key: receiver, value: gesture); |
556 | } |
557 | |
558 | // for each gesture type |
559 | for (GestureByTypes::const_iterator git = gestureByTypes.cbegin(), gend = gestureByTypes.cend(); git != gend; ++git) { |
560 | const QHash<QWidget *, QGesture *> &gestures = git.value(); |
561 | for (QHash<QWidget *, QGesture *>::const_iterator wit = gestures.cbegin(), wend = gestures.cend(); wit != wend; ++wit) { |
562 | QWidget *widget = wit.key(); |
563 | QWidget *w = widget->parentWidget(); |
564 | while (w) { |
565 | QMap<Qt::GestureType, Qt::GestureFlags>::const_iterator it |
566 | = w->d_func()->gestureContext.constFind(key: git.key()); |
567 | if (it != w->d_func()->gestureContext.constEnd()) { |
568 | // i.e. 'w' listens to gesture 'type' |
569 | if (!(it.value() & Qt::DontStartGestureOnChildren) && w != widget) { |
570 | // conflicting gesture! |
571 | (*conflicts)[widget].append(t: wit.value()); |
572 | break; |
573 | } |
574 | } |
575 | if (w->isWindow()) { |
576 | w = nullptr; |
577 | break; |
578 | } |
579 | w = w->parentWidget(); |
580 | } |
581 | if (!w) |
582 | (*normal)[widget].append(t: wit.value()); |
583 | } |
584 | } |
585 | } |
586 | |
587 | void QGestureManager::deliverEvents(const QSet<QGesture *> &gestures, |
588 | QSet<QGesture *> *undeliveredGestures) |
589 | { |
590 | if (gestures.isEmpty()) |
591 | return; |
592 | |
593 | typedef QHash<QWidget *, QList<QGesture *> > GesturesPerWidget; |
594 | GesturesPerWidget conflictedGestures; |
595 | GesturesPerWidget normalStartedGestures; |
596 | |
597 | QSet<QGesture *> startedGestures; |
598 | // first figure out the initial receivers of gestures |
599 | for (QSet<QGesture *>::const_iterator it = gestures.begin(), |
600 | e = gestures.end(); it != e; ++it) { |
601 | QGesture *gesture = *it; |
602 | QWidget *target = m_gestureTargets.value(key: gesture, defaultValue: nullptr); |
603 | if (!target) { |
604 | // the gesture has just started and doesn't have a target yet. |
605 | Q_ASSERT(gesture->state() == Qt::GestureStarted); |
606 | if (gesture->hasHotSpot()) { |
607 | // guess the target widget using the hotspot of the gesture |
608 | QPoint pt = gesture->hotSpot().toPoint(); |
609 | if (QWidget *topLevel = QApplication::topLevelAt(p: pt)) { |
610 | QWidget *child = topLevel->childAt(p: topLevel->mapFromGlobal(pt)); |
611 | target = child ? child : topLevel; |
612 | } |
613 | } else { |
614 | // or use the context of the gesture |
615 | QObject *context = m_gestureOwners.value(key: gesture, defaultValue: 0); |
616 | if (context->isWidgetType()) |
617 | target = static_cast<QWidget *>(context); |
618 | } |
619 | if (target) |
620 | m_gestureTargets.insert(key: gesture, value: target); |
621 | } |
622 | |
623 | Qt::GestureType gestureType = gesture->gestureType(); |
624 | Q_ASSERT(gestureType != Qt::CustomGesture); |
625 | Q_UNUSED(gestureType); |
626 | |
627 | if (Q_UNLIKELY(!target)) { |
628 | qCDebug(lcGestureManager) << "QGestureManager::deliverEvent: could not find the target for gesture" |
629 | << gesture->gestureType(); |
630 | qWarning(msg: "QGestureManager::deliverEvent: could not find the target for gesture"); |
631 | undeliveredGestures->insert(value: gesture); |
632 | } else { |
633 | if (gesture->state() == Qt::GestureStarted) { |
634 | startedGestures.insert(value: gesture); |
635 | } else { |
636 | normalStartedGestures[target].append(t: gesture); |
637 | } |
638 | } |
639 | } |
640 | |
641 | getGestureTargets(gestures: startedGestures, conflicts: &conflictedGestures, normal: &normalStartedGestures); |
642 | qCDebug(lcGestureManager) << "QGestureManager::deliverEvents:" |
643 | << "\nstarted: "<< startedGestures |
644 | << "\nconflicted: "<< conflictedGestures |
645 | << "\nnormal: "<< normalStartedGestures |
646 | << "\n"; |
647 | |
648 | // if there are conflicting gestures, send the GestureOverride event |
649 | for (GesturesPerWidget::const_iterator it = conflictedGestures.constBegin(), |
650 | e = conflictedGestures.constEnd(); it != e; ++it) { |
651 | QWidget *receiver = it.key(); |
652 | const QList<QGesture *> &gestures = it.value(); |
653 | qCDebug(lcGestureManager) << "QGestureManager::deliverEvents: sending GestureOverride to" |
654 | << receiver |
655 | << "gestures:"<< gestures; |
656 | QGestureEvent event(gestures); |
657 | event.t = QEvent::GestureOverride; |
658 | // mark event and individual gestures as ignored |
659 | event.ignore(); |
660 | for (QGesture *g : gestures) |
661 | event.setAccepted(g, false); |
662 | |
663 | QCoreApplication::sendEvent(receiver, event: &event); |
664 | bool eventAccepted = event.isAccepted(); |
665 | const auto eventGestures = event.gestures(); |
666 | for (QGesture *gesture : eventGestures) { |
667 | if (eventAccepted || event.isAccepted(gesture)) { |
668 | QWidget *w = event.m_targetWidgets.value(key: gesture->gestureType(), defaultValue: 0); |
669 | Q_ASSERT(w); |
670 | qCDebug(lcGestureManager) << "override event: gesture was accepted:"<< gesture << w; |
671 | QList<QGesture *> &gestures = normalStartedGestures[w]; |
672 | gestures.append(t: gesture); |
673 | // override the target |
674 | m_gestureTargets[gesture] = w; |
675 | } else { |
676 | qCDebug(lcGestureManager) << "override event: gesture wasn't accepted. putting back:"<< gesture; |
677 | QList<QGesture *> &gestures = normalStartedGestures[receiver]; |
678 | gestures.append(t: gesture); |
679 | } |
680 | } |
681 | } |
682 | |
683 | // delivering gestures that are not in conflicted state |
684 | for (GesturesPerWidget::const_iterator it = normalStartedGestures.constBegin(), |
685 | e = normalStartedGestures.constEnd(); it != e; ++it) { |
686 | if (!it.value().isEmpty()) { |
687 | qCDebug(lcGestureManager) << "QGestureManager::deliverEvents: sending to"<< it.key() |
688 | << "gestures:"<< it.value(); |
689 | QGestureEvent event(it.value()); |
690 | QCoreApplication::sendEvent(receiver: it.key(), event: &event); |
691 | bool eventAccepted = event.isAccepted(); |
692 | const auto eventGestures = event.gestures(); |
693 | for (QGesture *gesture : eventGestures) { |
694 | if (gesture->state() == Qt::GestureStarted && |
695 | (eventAccepted || event.isAccepted(gesture))) { |
696 | QWidget *w = event.m_targetWidgets.value(key: gesture->gestureType(), defaultValue: 0); |
697 | Q_ASSERT(w); |
698 | qCDebug(lcGestureManager) << "started gesture was delivered and accepted by"<< w; |
699 | m_gestureTargets[gesture] = w; |
700 | } |
701 | } |
702 | } |
703 | } |
704 | } |
705 | |
706 | void QGestureManager::recycle(QGesture *gesture) |
707 | { |
708 | QGestureRecognizer *recognizer = m_gestureToRecognizer.value(key: gesture, defaultValue: 0); |
709 | if (recognizer) { |
710 | gesture->setGestureCancelPolicy(QGesture::CancelNone); |
711 | recognizer->reset(state: gesture); |
712 | m_activeGestures.remove(value: gesture); |
713 | } else { |
714 | cleanupGesturesForRemovedRecognizer(gesture); |
715 | } |
716 | } |
717 | |
718 | bool QGestureManager::gesturePending(QObject *o) |
719 | { |
720 | const QGestureManager *gm = QGestureManager::instance(ic: DontForceCreation); |
721 | return gm && gm->m_gestureOwners.key(value: o); |
722 | } |
723 | |
724 | QT_END_NAMESPACE |
725 | |
726 | #endif // QT_NO_GESTURES |
727 | |
728 | #include "moc_qgesturemanager_p.cpp" |
729 |
Definitions
- lcGestureManager
- panTouchPoints
- QGestureManager
- ~QGestureManager
- registerGestureRecognizer
- unregisterGestureRecognizer
- cleanupCachedGestures
- getState
- logIgnoredEvent
- filterEventThroughContexts
- cancelGesturesForChildren
- cleanupGesturesForRemovedRecognizer
- filterEvent
- filterEvent
- filterEvent
- getGestureTargets
- deliverEvents
- recycle
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