[vtkusers] QVTKWidget is flickering

[Clinton Stimpson]

Its not possible to fix in QVTKWidget.
If you want someone to fix this flicker, then I suggest you submit it as a Qt 
bug.
Here's a snippet of your example, modified to demonstrate the problem without 
VTK.  The flicker comes from calling winId().

    def add_viewer(self):
        viewer = QtGui.QWidget()
        viewer.setStyleSheet('background: black;')
        self.view_manager.winId()
        self.view_manager.addWidget(viewer)
        self.view_manager.setCurrentWidget(viewer)

On Tuesday, June 05, 2012 12:49:59 PM José M. Rodriguez Bacallao wrote:
> by the way, this need to be done in the parent of QVTKWidget? it's not
> possible to do it in QVTKWidget?
> 
> On 6/4/12, José M. Rodriguez Bacallao <jmrbcu at gmail.com> wrote:
> > thanks very much, it work like a charm!!!
> > 
> > On Mon, Jun 4, 2012 at 3:05 PM, Clinton Stimpson <clinton at elemtech.com>
> > 
> > wrote:
> >> The flicker comes from converting the parent widget of QVTKWidget (in
> >> this
> >> case, your view manager) from an alien widget to a native one.
> >> 
> >> In your Workspace.__init__, you can call
> >> self.view_manager.setAttribute(QtCore.Qt.WA_NativeWindow)
> >> so its a native window from the start.
> >> 
> >> Clint
> >> 
> >> On Monday, June 04, 2012 01:17:37 PM José M. Rodriguez Bacallao wrote:
> >>> I am using Archlinux, 64 and 32 bits, and using vtk 5.10.
> >>> I also tried setting self.view_manager.setUpdatesEnabled(False/True)
> >>> but nothing happens
> >>> 
> >>> On Mon, Jun 4, 2012 at 1:04 PM, Clinton Stimpson
> >>> <clinton at elemtech.com>
> >> 
> >> wrote:
> >>> > Which platform... VTK version ?
> >>> > 
> >>> > On Monday, June 04, 2012 12:55:34 PM José M. Rodriguez Bacallao wrote:
> >>> >> hi folks, as I posted previously, I am trying to use
> >>> >> QVTKWidget with
> >>> >> QStackedWidget, I have two QStackedWidget nested one inside
> >>> >> the
> >>> >> other.
> >>> >> For examples, I have a QMainWindow and as central widget is a
> >>> >> QStackWidget that manage what I call "applications". An
> >>> >> application
> >>> >> is
> >>> >> a simple QWidget, and, in my case, is a QWidget with a
> >>> >> QStackWidget
> >>> >> inside it that manage QVTKWidget's (image viewers). The
> >>> >> problem arise when I add a QVTKWidget to the internal
> >>> >> QStackedWidget, it show ok but, has an annoying flickering
> >>> >> and I canot allow this in a medical application, here I post
> >>> >> an example code to demostrate what I mean:
> >>> >> 
> >>> >> 
> >>> >> from PyQt4 import QtGui, QtCore
> >>> >> import images, vtk
> >>> >> 
> >>> >> 
> >>> >> class Workspace(QtGui.QMainWindow):
> >>> >> 
> >>> >>     def __init__(self, parent=None):
> >>> >>         super(Workspace, self).__init__(parent)
> >>> >> 
> >>> >>         self.main_tb = self.addToolBar('main')
> >>> >>         self.add_action = self.main_tb.addAction('Add viewer')
> >>> >>         self.add_action.triggered.connect(self.add_viewer)
> >>> >> 
> >>> >>         self.app_manager = QtGui.QStackedWidget(self)
> >>> >>         self.app_manager.setStyleSheet('background: red;')
> >>> >>         self.setCentralWidget(self.app_manager)
> >>> >> 
> >>> >>         self.workspace_app = QtGui.QWidget(self.app_manager)
> >>> >>         self.view_manager =
> >>> >> QtGui.QStackedWidget(self.workspace_app)
> >>> >>         self.view_manager.setStyleSheet('background: blue;')
> >>> >>         self.workspace_app_layout =
> >>> >> QtGui.QHBoxLayout(self.workspace_app)
> >>> >> self.workspace_app_layout.addWidget(self.view_manager)
> >>> >> 
> >>> >>         self.app_manager.addWidget(self.workspace_app)
> >>> >>         self.app_manager.setCurrentWidget(self.workspace_app)
> >>> >> 
> >>> >>     def add_viewer(self):
> >>> >>         viewer = vtk.QVTKWidget(self)
> >>> >>         self.renderer = vtk.vtkRenderer()
> >>> >>         self.renderer.SetBackground(0, 0, 0)
> >>> >>         viewer.GetRenderWindow().AddRenderer(self.renderer)
> >>> >>         self.view_manager.addWidget(viewer)
> >>> >>         self.view_manager.setCurrentWidget(viewer)
> >>> >> 
> >>> >> 
> >>> >> if __name__ == '__main__':
> >>> >>     app = QtGui.QApplication([])
> >>> >>     w = Workspace()
> >>> >>     w.showFullScreen()
> >>> >>     app.exec_()
> >>> >> 
> >>> >> any ideas please, I need to solve this issue as quickly as
> >>> >> possible
> >>> >> because of my deadline!!!.
> >>> >> _______________________________________________
> >>> >> Powered by www.kitware.com
> >>> >> 
> >>> >> Visit other Kitware open-source projects at
> >>> >> http://www.kitware.com/opensource/opensource.html
> >>> >> 
> >>> >> Please keep messages on-topic and check the VTK FAQ at:
> >>> >> http://www.vtk.org/Wiki/VTK_FAQ
> >>> >> 
> >>> >> Follow this link to subscribe/unsubscribe:
> >>> >> http://www.vtk.org/mailman/listinfo/vtkusers
> >>> > 
> >>> > --
> >>> > Clinton Stimpson
> >>> > Elemental Technologies, Inc
> >>> > Computational Simulation Software, LLC
> >>> > www.csimsoft.com
> >>> 
> >>> _______________________________________________
> >>> Powered by www.kitware.com
> >>> 
> >>> Visit other Kitware open-source projects at
> >>> http://www.kitware.com/opensource/opensource.html
> >>> 
> >>> Please keep messages on-topic and check the VTK FAQ at:
> >>> http://www.vtk.org/Wiki/VTK_FAQ
> >>> 
> >>> Follow this link to subscribe/unsubscribe:
> >>> http://www.vtk.org/mailman/listinfo/vtkusers
> >> 
> >> --
> >> Clinton Stimpson
> >> Elemental Technologies, Inc
> >> Computational Simulation Software, LLC
> >> www.csimsoft.com
> 
> _______________________________________________
> Powered by www.kitware.com
> 
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
> 
> Please keep messages on-topic and check the VTK FAQ at:
> http://www.vtk.org/Wiki/VTK_FAQ
> 
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers
-- 
Clinton Stimpson
Elemental Technologies, Inc
Computational Simulation Software, LLC
www.csimsoft.com