Move window using PySide and PyKDE4

Question

How should I go about moving a window created with PySide using the window manager?

I see that kdeui has the NETRootInfo class with a moveResizeRequest method, which does exactly what I want. The following:

from PySide.QtCore import Qt
from PyKDE4 import kdeui
from PySide.QtGui import QX11Info
import sys
from ctypes import CDLL
Xlib = CDLL('libX11.so.6')

def move_window(window, event):
    if event.buttons() & Qt.LeftButton:
        pos = event.buttonDownScreenPos(Qt.LeftButton)
        Xlib.XUngrabPointer(QX11Info.display(), QX11Info.appTime())
        rootinfo = kdeui.NETRootInfo(QX11Info.display(), kdeui.NET.WMMoveResize)
        rootinfo.moveResizeRequest(window.winId(), pos.x(), pos.y(), kdeui.NET.Move)

gives me:

TypeError: NETRootInfo(): arguments did not match any overloaded call:
  overload 1: argument 1 has unexpected type 'int'
  overload 2: argument 1 has unexpected type 'int'
  overload 3: argument 1 has unexpected type 'int'
  overload 4: argument 1 has unexpected type 'int'

This error is caused because QX11Info.display() returns a long (pointer), and not a Display structure.

I can use PyQt4's QX11Info.display() as the first parameter to NETRootInfo's constructor instead of the PySide one, like:

...
from PySide.QtGui import QX11Info
from PyQt4.QtGui import QX11Info as QX11InfoQt
...

def move_window(window, event):
    if event.buttons() & Qt.LeftButton:
        pos = event.buttonDownScreenPos(Qt.LeftButton)
        Xlib.XUngrabPointer(QX11Info.display(), QX11Info.appTime())
        rootinfo = kdeui.NETRootInfo(QX11InfoQt.display(), kdeui.NET.WMMoveResize)
        rootinfo.moveResizeRequest(window.winId(), pos.x(), pos.y(), kdeui.NET.Move)

But this adds a dependency on PyQt4 in addition to PySide.

Additionally, I have tried using Xlib's XMoveWindow function, but this prevents the window from dragging partially off screen, and does not give the move feedback (e.g. transparency effects) provided by window managers like Compiz or KWin.

My question is:

1. How to I convert PySide's QX11Info.display() into a "Display" that can be passed to kdeui.NETRootInfo, or
2. How do I use Python and Xlib (either with python-xlib or through libX11.so) to use a message like _NET_WM_MOVERESIZE in order to move the window?

Answer 1

I suspect your last call actually has different signature, perhaps like this:

moveResizeRequest(<window object>, <int>, <int>, <const>)

while you are trying to squeeze window id (int) instead.

having had a bit of experience with pygtk (and not pykde), you probably have to enumerate all high-level windows in given screen to get a window handle object.

Similarly, from c++ kde docs:

display     An X11 Display struct.
supportWindow   The Window id of the supportWindow. The supportWindow must be created by the window manager as a child of the rootWindow. The supportWindow must not be destroyed until the Window Manager exits.

while you are trying to squeeze some constant into supportWindow.