PyQt eventFilter KeyPress

[luiz elias]

Hi all,

I'm trying get a eventFilter to work and get the keyboard press event,
it works fine for me with mouse events but I can't get the keyboard events to work,
i guess I'm missing something,
this is the far I got:

import sip
import maya.OpenMayaUI as OpenMayaUI
from PyQt4 import QtGui, QtCore

class MouseEventFilter(QtCore.QObject):
def eventFilter(self, obj, event):
if event.type() == QtCore.QEvent.KeyPress:
print "working..."
return True
return False

view = OpenMayaUI.M3dView.active3dView()
widget = sip.wrapinstance(long(view.widget()), QtCore.QObject)
eventFilter = MouseEventFilter(widget)

widget.installEventFilter(eventFilter)

#widget.removeEventFilter(eventFilter)

problem is that the QtCore.QEvent.KeyPress never happends =/
any ideas why??

thnaks!

Luiz

[Jiet Shern Neo]

I recently was working on some keypress event too (in c++ though but I think the issues might be the same). One thing I realize is that keypress event only appear when the widget is in focus. I have to explicitly set the widget in focus when my mouse enter the widget (I am using the keypress in combination with my mouse to activate a tool) You might want to check if the loss of focus of your widget might be the issue.

Luiz

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[luiz elias]

thanks for reply!
do you mind to show some code?

I've tried this, but still not working..

import sip
import maya.OpenMayaUI as OpenMayaUI
from PyQt4 import QtGui, QtCore

import PyQt4

class MouseEventFilter(QtGui.QWidget):
    def __init__(self, parent):
        QtGui.QWidget.__init__(self, parent)
        self.setFocusPolicy(QtCore.Qt.StrongFocus)

   
    def eventFilter(self, obj, event):
        if event.type() == QtCore.QEvent.KeyPress:

            print "key press"
            return False

        return False
       
view = OpenMayaUI.M3dView.active3dView()
widget = sip.wrapinstance(long(view.widget()), QtCore.QObject)
eventFilter = MouseEventFilter(widget)

widget.installEventFilter(eventFilter)
#widget.removeEventFilter(eventFilter)

thank you!

[luiz elias]

it works fine if I install the eventFilter on the main window, but I can't find a way to set keyboard focus for the QGLWidget.

thanks!

[Justin Israel]

I got it working after a click occurs in the viewport, but not when you just try and call setFocus() on the widget.

On Feb 13, 2013, at 11:35 PM, luiz elias wrote:

it works fine if I install the eventFilter on the main window, but I can't find a way to set keyboard focus for the QGLWidget.

thanks!

[Justin Israel]

Sent too quickly...

I meant to say that just calling setFocus() still seems to require a click before it really grabs the keyboard:

http://pastebin.com/KfpjXABm

import sip

import maya.OpenMayaUI as OpenMayaUI

from PyQt4 import QtGui, QtCore

class MouseEventFilter(QtCore.QObject):

    def eventFilter(self, obj, event):

        typ = event.type()

        if typ == event.Enter or typ == event.MouseButtonPress:

            print "mouse enter"

            obj.setFocus()

        elif typ == event.Leave:

            print "mouse leave"

            obj.clearFocus()

        elif typ == event.KeyPress:

            print "working..."

            return True

        return False

view = OpenMayaUI.M3dView.active3dView()

widget = sip.wrapinstance(long(view.widget()), QtCore.QObject)

eventFilter = MouseEventFilter()

widget.installEventFilter(eventFilter)

# remove

widget.removeEventFilter(eventFilter)

eventFilter.deleteLater()

[Ravi Jagannadhan]

If this is on Linux, what is your mouse focus policy in the OS? Is it click to focus?

--
Where we have strong emotions, we're liable to fool ourselves - Carl Sagan

[Justin Israel]

Not sure if that question was directed at me or Luiz, but I am using click to focus for my linux setting. But I would assume an explicit setFocus() call would do it. It is required for me to even see a reaction after I then click and start pressing keys, but I also tried to grabKeyboard which made no difference in terms of requiring the click.

[Ravi Jagannadhan]

Sorry, I should've clarified, I was asking you :) I wonder if the OS setting overrides the behaviour, which is why I'd asked.

[Justin Israel]

Gah. I just realized that when I had tested this the other day, it was on my Mac. So I can't speak for Linux but I can test that theory when I get to work.
Strangely when I set focus for normal widgets like a line edit, they grab the keyboard. So maybe its a bit different for Maya based Qt widgets.

[luiz elias]

it works fine if I install the filter on the main window, so I end up creating 2 filter one for mouse click on the main window and another for mouse pos on the GLWidget..
this is for use in conjunction with a MPxContext by the way = )
thanks!

luiz