Events with pyKDE 0.8.

Henning Schroeder hschroeder at gmx.net
Tue Aug 3 15:49:36 CEST 1999


Peter Torstenson <p.t at iname.com> wrote:
> I have defined an event as follows.
> [..]
> Now. this works fine on the mainwidget. But how do I define it to work with
> a widget placed on the main widget. Ex, a label.
Look at the source below. You have got two possibilities to solve your problem.
Either you create you own label through subclassing QLabel and implementing
mousePresEvent or you can catch the events for a simple QLabel with 
installEventFilter. The second method is quite cool because you can use it with
any widget without sub-classing (I'm working on a dialog-editor using this
feature). Unfortunately you cannot (as far as I known) convert the QEvent to 
QMouseEvent in eventFilter. In C++ it is simple macro (definded in qevent.h)
but pyKDE does not support this (even not in pyKDE 0.9pre2 :-( ). This would 
be  necessary to access to mouse position.

Greets
  Henning


--------------------------------------------------------------
from kde import *

class MyLabel(QLabel):  
    def mousePressEvent(self, event):
	print "mouse button on %s pressed" % self

class Window(QDialog):
    def __init__(self, *args):
	apply(QDialog.__init__, (self,) + args)
	self.label1 = QLabel("Hello", self)
	self.label1.installEventFilter(self) # catch events
	self.label2 = MyLabel("World!", self)
	self.label2.move(self.label1.width(), 0)
	
    def eventFilter(self, object, event):
	if event.type() == Event_MouseButtonPress:
	    print "mouse button on %s pressed" % object
	    return 1 # event handled
	else: 
	    return 0 # pass event to next handler

import sys
app = QApplication(sys.argv)
win = Window()
app.setMainWidget(win)
app.mainWidget().show()
app.exec_loop()




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