Mouse release event and QApplication.processEvents()

[Ahmidou Lyazidi]

Hi,
This is my first post here,
I'm trying to make a generalized pickobjects tool and I want it to stop the script evaluation until
the user exit the picking cession.
I've seen this asked here and there and there might just not be a solution for it, but I'm giving it a shot.
I'm actually quite close and I'm just using a while loop with processEvents() to still have access to the UI,
unfortunately I'm having an odd behavior on mouse release, it seems it's re-running the whole code, queuing it
and finally execute the queued code.

import maya.OpenMayaUI as om
from PySide import QtGui, QtCore
from PySide.QtCore import *
from PySide.QtGui import *
from shiboken import wrapInstance
import shiboken


class MouseEventFilter(QtCore.QObject):
    def __init__(self, label=None):
        self.__label = label
        QtCore.QObject.__init__(self)
        self.x = 0
        self.y = 0
       
    def eventFilter(self, obj, event):
        typ = event.type()
        if event.type() == event.MouseMove:
            print event.x(), event.y()
            self.x = event.x()
            self.y = event.y()
        if event.type() == event.MouseButtonPress:
            print "pressed"
        if event.type() == event.MouseButtonRelease:
            print "release"
        return False

class KeyEventFilter(QtGui.QWidget):
    def __init__(self, label=None):
        self.__label = label
        QtGui.QWidget.__init__(self)
        self.exit = False
        self.setFocusPolicy(QtCore.Qt.StrongFocus)

    def eventFilter(self, obj, event):
        if event.type() == QtCore.QEvent.KeyPress:
            typ = event.type()
            print typ
            self.exit = True
            return True
 
        return False


mayaMainWindowPtr = om.MQtUtil.mainWindow()
mayaMainWindow = wrapInstance(long(mayaMainWindowPtr), QWidget)
kEventFilter = KeyEventFilter(mayaMainWindow)
mayaMainWindow.installEventFilter(kEventFilter)

view = om.M3dView.active3dView()
widget_ptr = view.widget()
widget = wrapInstance(long(widget_ptr), QWidget)
mEventFilter = MouseEventFilter(widget)
widget.installEventFilter(mEventFilter)

while True:
    QtGui.qApp.processEvents()
    #cmds.evalDeferred(flop, low=True)

    #print eventFilter.x, eventFilter.y
    if kEventFilter.exit == True:
        widget.removeEventFilter(mEventFilter)
        kEventFilter.deleteLater()
        mayaMainWindow.removeEventFilter(kEventFilter)
        kEventFilter.deleteLater()
        break


print "should run after"

If someone have an idea about it!
Thanks
-A

[Ahmidou Lyazidi]

I forgot to add, the procedure:
-run the script
-do a few clicks in the viewport
-press any key to escape the click cession and resume the script

Cheers
-A

[Justin Israel]

I would be concerned that you have created a busy loop, by using a while loop and processEvents() without using WaitForMoreEvents. Maybe this is a cause of your issues, I dont know. Have you looked at using a QEventLoop? 

http://doc.qt.io/qt-4.8/qeventloop.html

You can create one and pass a reference to your event watchers. Any one of them call call myEvent.quit() to break the event loop. Then in the spot where you want to block, you call myEvent.exec_(). After the exec returns, you can do all your clean up.

Justin

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