def viewportEvent(self, e):
if e.type() == QEvent.TouchBegin or e.type() == QEvent.TouchUpdate or
e.type() == QEvent.TouchEnd:
points = e.touchPoints()
if e.type() == QEvent.TouchBegin and not self.scene().dragItem:
e.accept()
if len(points) == 2 and e.type() == QEvent.TouchUpdate:
e.accept()
THRESHOLD = 10.0
COEFF = 1.0
orig = QLineF(points[0].startPos(), points[1].startPos())
now = QLineF(points[0].pos(), points[1].pos())
delta = abs(now.length() - orig.length())
if self.zoomScaleStart is None and delta > THRESHOLD:
self.zoomScaleStart = self.scene().scaleFactor
if self.zoomScaleStart:
if self.animTimer is None:
self.animTimer = self.startTimer(util.ANIM_TIMER_MS)
zoom = self.zoomScaleStart * (now.length() / orig.length())
* COEFF
self.zoomAbsolute(zoom)
# oldVValue = self.verticalScrollBar().value()
# vDiff = points[0].lastPos().y() - points[0].pos().y()
# newVValue = oldVValue + vDiff
# self.verticalScrollBar().setValue(newVValue)
# oldHValue = self.horizontalScrollBar().value()
# hDiff = points[0].lastPos().x() - points[0].pos().x()
# newHValue = oldHValue + hDiffOA
# self.horizontalScrollBar().setValue(newHValue)
if e.type() == QEvent.TouchEnd or e.type() == QEvent.TouchCancel:
self.zoomScaleStart = None
if self.animTimer:
self.killTimer(self.animTimer)
self.animTimer = None
return True
return super().viewportEvent(e)
def zoomAbsolute(self, x):
if x < 0:
x = .0000001
if self.scene().scaleFactor != x:
self.scene().setScaleFactor(x)
self.scaleWaiting = True
def _setScale(self, x):
self.setTransform(QTransform.fromScale(x, x))
def timerEvent(self, e):
if self.scaleWaiting:
x = self.scene().scaleFactor
self._setScale(x)
self.scaleWaiting = False
if self.panWaiting:
self.centerOn(self.panCenter)
self.panWaiting = False
> On Jul 25, 2017, at 12:27 AM, Christian Gagneraud <[email protected]> wrote:
>
>
>
> On 25/07/2017 7:24 pm, "Patrick Stinson" <[email protected]
> <mailto:[email protected]>> wrote:
> Hi there!
>
> If I am setting a QGraphicsView's scale via setTransform() while scrolling
> up/down+left/right with two fingers on the trackpad, but the paint updates
> don’t come until after I stop moving my fingers which stops the wheel events.
> Is there a way to update the view with the new transform while scrolling
>
> Can you show your event handlers, difficult to say without seeing except that
> it should work.
>
> Chris
>
>
>
> Thanks!
> _______________________________________________
> Interest mailing list
> [email protected] <mailto:[email protected]>
> http://lists.qt-project.org/mailman/listinfo/interest
> <http://lists.qt-project.org/mailman/listinfo/interest>
>
>
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