Qt5 PinchArea + Flickable not working well

mrAlmond

Hi everyone,

I need to create a sort of qml map element in which a large image must be zoomed (with pinch gesture) and moved with the flickable.
As start point I used the flickresize.qml demo:
http://qt-project.org/doc/qt-5.0/qtquick/touchinteraction-pincharea-flickresize-qml.html

In my case I'm using Qt 5.1.0 in Windows 7 with a capacitive multi touch monitor.

This demo doesn't work as expected...when it starts the pan feature is ok...but when a pinch gesture is performed the subsequential pan gestures makes the image jump apparently random of some pixels in all directions.
To "reset" the situation, after the pinch, I must press touch two times the image and then the flickable seems to start working well again. This situation changes randomly with similar behaviours.

Another test case is to perform a pinch-to-zoom, release both the fingers and then try to pinch zoom in another area...the result is not good at all.

I've tried also with qt 5.1.1 but nothing changes.

mrAlmond

Please can someone confirm me that what I'm seeing happens to everyone..or it's just me?

mrAlmond

Up...I think that the usage of a flickable + pincharea for a complete pinch-to-zoom and pan map is almost mandatory. At the moment also the flickresize example fails...is there someone who could help me on this?

tonypolichroniadis

I'm having the same problem on Android in Qt 5.2. The first drag after pinching always results in a jump in position.

tonypolichroniadis

I've figured out a workaround:

onPinchStarted: flick.interactive = false

onPinchFinished: flick.interactive = true

Seems to make my pincharea + flickable work much better.