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iOS: Fix touch point translation when root view controller is offset

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Instead of doing manual translation of the local touch point to global
screen (QScreen) coordinates we take advantage of the fact that QWindow
already has a position that's adjusted for all of the view-controller
offsets in its parent hierarchy.

Change-Id: Ib34173db5ac053c20712dfff469c4a1286f2a324
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>
This commit is contained in:
Tor Arne Vestbø 2013-12-11 19:00:36 +01:00
parent 0cd3416136
commit f1970c8916
1 changed files with 16 additions and 13 deletions
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29
src/plugins/platforms/ios/quiview.mm
View File

@ -223,26 +223,29 @@
- (void)updateTouchList:(NSSet *)touches withState:(Qt::TouchPointState)state
{
// We deliver touch events in global coordinates. But global in this respect
// means the same coordinate system that we use for describing the geometry
// of the top level QWindow we're inside. And that would be the coordinate
// system of the superview of the UIView that backs that window:
QPlatformWindow *topLevel = m_qioswindow;
while (QPlatformWindow *topLevelParent = topLevel->parent())
topLevel = topLevelParent;
UIView *rootView = reinterpret_cast<UIView *>(topLevel->winId()).superview;
CGSize rootViewSize = rootView.frame.size;
foreach (UITouch *uiTouch, m_activeTouches.keys()) {
QWindowSystemInterface::TouchPoint &touchPoint = m_activeTouches[uiTouch];
if (![touches containsObject:uiTouch]) {
touchPoint.state = Qt::TouchPointStationary;
} else {
touchPoint.state = state;
// Touch positions are expected to be in QScreen global coordinates, and
// as we already have the QWindow positioned at the right place, we can
// just map from the local view position to global coordinates.
QPoint localViewPosition = fromCGPoint([uiTouch locationInView:self]).toPoint();
QPoint globalScreenPosition = m_qioswindow->mapToGlobal(localViewPosition);
touchPoint.area = QRectF(globalScreenPosition, QSize(0, 0));
// FIXME: Do we really need to support QTouchDevice::NormalizedPosition?
QSize screenSize = m_qioswindow->screen()->geometry().size();
touchPoint.normalPosition = QPointF(globalScreenPosition.x() / screenSize.width(),
globalScreenPosition.y() / screenSize.height());
// We don't claim that our touch device supports QTouchDevice::Pressure,
// but fill in a meaningfull value in case clients use it anyways.
touchPoint.pressure = (state == Qt::TouchPointReleased) ? 0.0 : 1.0;
QPoint touchPos = fromCGPoint([uiTouch locationInView:rootView]).toPoint();
touchPoint.area = QRectF(touchPos, QSize(0, 0));
touchPoint.normalPosition = QPointF(touchPos.x() / rootViewSize.width, touchPos.y() / rootViewSize.height);
}
}
}