[PySide] capturing a simple "gesture" e.g. for scaling

Frank Rueter | OHUfx frank at ohufx.com
Sun Feb 14 08:51:18 CET 2016

So this kinda works, but I can't set the widget to be fully transparent 
without losing the mouseMoveEvent.
Any ideas?

from PySide import QtGui
from PySide import QtCore

class ModalScaleWidget(QtGui.QWidget):

     scaling = QtCore.Signal(float)

     def __init__(self, parent=None):
         super(ModalScaleWidget, self).__init__(parent)

     def mouseMoveEvent(self, event):
         '''Emit signal with the distance to the position of the first 
         point = event.pos() - self.posOnClick

     def mousePressEvent(self, event):
         '''Store the initial position when the user clicks'''
         self.posOnClick = event.pos()

     def mouseReleaseEvent(self, event):
         '''Close widget when mouse is released'''

     def keyPressEvent(self, event):
         '''Close widget when escape key is pressed'''
         if event.key() == QtCore.Qt.Key_Escape:

         super(ModalScaleWidget, self).keyPressEvent(event)

def test(distance):
     print distance

if __name__ == '__main__':
     import sys
     app = QtGui.QApplication(sys.argv)
     w = ModalScaleWidget()

On 14/02/16 6:39 pm, Frank Rueter | OHUfx wrote:
> Hi all,
> I am keen to figure out how I can create a mode that will output the 
> result of a simple gesture, such as a horizonal or vertical drag.
> This is not for phones/tablets, but rather for "invisible sliders", 
> where the user can press a hotkey to go into a certain "mode", then 
> click/drag to perform a certain action (such as scaling or drawing a 
> line on the screen).
> First I was thinking about an invisible widget that opens in full 
> screen and grabs the mouse event, but that seemed rather brute force 
> and ugly. Then I saw the docs for QGestureEvent but the examples I 
> found are sparse and all in C++. I'd be happy to explore those more 
> but I'm not sure if I'm even on the right track here.
> Can somebody point me in the right direction please?
> Cheers,
> frank
> -- 
> ohufxLogo 50x50 <http://www.ohufx.com> 	*vfx compositing 
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ohufxLogo 50x50 <http://www.ohufx.com> 	*vfx compositing 
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and consulting <http://ohufx.com/index.php/vfx-customising>* *

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