Marco Fabiani wrote:
David Boddie wrote:
On Sun Aug 24 12:43:33 BST 2008, Paul Giannaros wrote:
On Sun, Aug 24, 2008 at 12:03 PM, himork <himork at kth.se> wrote:
I am trying to write a custom widget in python/pyqt to be used inside
QtDesigner. Everything seems to work fine (i followed the tutorials and
examples available), except for the signals: when I use __pyqtSignals__ =
("mysignal(double)"), the widget ends up having one signal for each
letter of "mysignal(double)", parenthesis included, like it cannot
understand that this is a string.
Paul's explanation is correct. This is an interesting side effect of the
fact that PyQt accepts any kind of sequence for __pyqtSignals__.
The comma worked, thank you!
And if I had 2 signals, designer crashes when I try to add my custom
widget.
Can you say what you wrote for __pyqtSignals__ in that case? I would be
interested to know why it caused a crash.
A follow up to my previous email: the code I posted didn't crash because
it was not doing what it was meant to do. What I am trying to do is to
subclass QSlider in order to emit a custom signal
valueDoubleChanged(double) that is just value/100. Here is my code that
crashes designer, I wonder if you could give me a hand with this:
----------
from PyQt4.QtCore import *
from PyQt4.QtGui import *
class myDoubleSlider(QSlider):
__pyqtSignals__ = ("valueDoubleChanged(double)",)
def __init__(self,parent = None):
QSlider.__init__(self,parent)
self.setOrientation(Qt.Horizontal)
self.connect( self , SIGNAL("valueChanged(int)") ,
self.setValueDouble)
@pyqtSignature("setValueDouble(double)")
def setValueDouble(self):
self.emit(SIGNAL("valueDoubleChanged(double)") ,
self.value()/100)
if __name__ == "__main__":
import sys
app = QApplication(sys.argv)
slider = myDoubleSlider()
slider.show()
sys.exit(app.exec_())
-----
Thank you
Marco
The crash happens when I pass __pyqtSignal__ a tuple (so it happened
with the single signal + comma as well). Here is part of the code:
[...]
__pyqtSignal = ("valueDChanged(double)",)
[...]
@QtCore.pyqtSignature("setValueDouble(double)")
def setValueDouble(self, value = None):
if value !=self.valueD:
if value is not None:
self.valueD = value
self.setValue(int(round(self.valueD*100)))
seelf.emit(QtCore.SIGNAL("valueDChanged(double)"),value)
self.update()
[...]
I managed not to crash designer by using self.valueD instead of value
when I emit the signal. My guess is that the problem is "value" that by
default is "None", am I right?
Thanks for the help!
Marco
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