AuroraMiddleware/qt5base-lts
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

QGestureManager: don't abuse a QMap for a set

Browse Source 
The filterEvents() implementations used a QMap<GestureType, int> for
tracking whether a given type was already seen. The mapped_type was
completely unused.

Since the expected number of gesture types is very low, go directly to
QVarLengthArray, not QSet, as the reduced number of allocation will
dwarf the low overhead of O(N) search vs. O(1) for QSet or O(logN) for
QMap.

Change-Id: I98b6af69f11cca753e3c7c4fbb58e8f2e935e0d5
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
This commit is contained in:
Marc Mutz 2017-12-18 10:42:27 +01:00
parent f7ae47ad07
commit cea46aa362
1 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/widgets/kernel/qgesturemanager.cpp
View File

@ -509,14 +509,14 @@ void QGestureManager::cleanupGesturesForRemovedRecognizer(QGesture *gesture)
// return true if accepted (consumed)
bool QGestureManager::filterEvent(QWidget *receiver, QEvent *event)
{
QMap<Qt::GestureType, int> types;
QVarLengthArray<Qt::GestureType, 16> types;
QMultiMap<QObject *, Qt::GestureType> contexts;
QWidget *w = receiver;
typedef QMap<Qt::GestureType, Qt::GestureFlags>::const_iterator ContextIterator;
if (!w->d_func()->gestureContext.isEmpty()) {
for(ContextIterator it = w->d_func()->gestureContext.constBegin(),
e = w->d_func()->gestureContext.constEnd(); it != e; ++it) {
types.insert(it.key(), 0);
types.push_back(it.key());
contexts.insert(w, it.key());
}
}
@ -528,7 +528,7 @@ bool QGestureManager::filterEvent(QWidget *receiver, QEvent *event)
e = w->d_func()->gestureContext.constEnd(); it != e; ++it) {
if (!(it.value() & Qt::DontStartGestureOnChildren)) {
if (!types.contains(it.key())) {
types.insert(it.key(), 0);
types.push_back(it.key());
contexts.insert(w, it.key());
}
}
@ -543,14 +543,14 @@ bool QGestureManager::filterEvent(QWidget *receiver, QEvent *event)
#if QT_CONFIG(graphicsview)
bool QGestureManager::filterEvent(QGraphicsObject *receiver, QEvent *event)
{
QMap<Qt::GestureType, int> types;
QVarLengthArray<Qt::GestureType, 16> types;
QMultiMap<QObject *, Qt::GestureType> contexts;
QGraphicsObject *item = receiver;
if (!item->QGraphicsItem::d_func()->gestureContext.isEmpty()) {
typedef QMap<Qt::GestureType, Qt::GestureFlags>::const_iterator ContextIterator;
for(ContextIterator it = item->QGraphicsItem::d_func()->gestureContext.constBegin(),
e = item->QGraphicsItem::d_func()->gestureContext.constEnd(); it != e; ++it) {
types.insert(it.key(), 0);
types.push_back(it.key());
contexts.insert(item, it.key());
}
}
@ -563,7 +563,7 @@ bool QGestureManager::filterEvent(QGraphicsObject *receiver, QEvent *event)
e = item->QGraphicsItem::d_func()->gestureContext.constEnd(); it != e; ++it) {
if (!(it.value() & Qt::DontStartGestureOnChildren)) {
if (!types.contains(it.key())) {
types.insert(it.key(), 0);
types.push_back(it.key());
contexts.insert(item, it.key());
}
}