PyQt app in seperate thread

[anders]

I am writing a plugin for a piece of software in python, and I want to
start up a PyQt GUI in the plugin, without stalling the main thread
while the gui is running (later i will want to pass messages between
the main thread and the gui thread).

I'm new to pyqt, so I'm probably doing something very silly, but for
the moment I'm just trying to get the first pyqt tutorial example
running in a seperate thread:

----8<--------

import sys
from PyQt4 import QtGui
from PyQt4 import QtCore

class MyThread( QtCore.QThread ):
	def __init__( self ):
		QtCore.QThread.__init__( self )

	def run( self ):
		app = QtGui.QApplication( sys.argv )
		hello = QtGui.QPushButton( 'Hello world!' )
		hello.resize( 500, 500 )
		hello.show()
		app.exec_()
		QtCore.QThread.terminate(  )



mt = MyThread()
mt.start()
print 'Main thread continuing...'
mt.wait()
print 'GUI thread finished.'

----8<--------

The app starts up (with a warning WARNING: QApplication was not created
in the main() thread. ). I get a window, but no button, and clicking on
the close button does nothing and I have to force the program to quit.

There's got to be a way to get this working, right? Can anyone help me
along the right path?

Cheers,

Anders