Painting png image to widget, nothing displays

[kainev]

Hi Everyone!

I've just picked up Qt as I do a lot of work in Autodesk Maya, I'm using the 'PySide' python implementation though answers with the PyQt4 implementation or C++ is fine as well, I'll just try and translate :P

So I've got an icon, which is a 64x64 pixel PNG image, and I've got a custom widget that subclasses QWidget. In the paintEvent, I want to paint this image to the widget.

From looking up examples I thought the bare minimum I needed to do to make it display was:

import PySide.QtGui as QtGui
import PySide.QtCore as QtCore
 
class CustomWidget(QtGui.QWidget):
    def __init__(self):
        super(CustomWidget, self).__init__()
 
        self._pixmap = QtGui.QPixmap("C:/.../icons/arrow_down.png")
 
    def paintEvent(self, event):
        painter = qg.QPainter(self)
        painter.drawPixmap(event.rect(), self._pixmap)

import PySide.QtGui as QtGui
import PySide.QtCore as QtCore
        
class CustomWidget(QtGui.QWidget):
    def __init__(self):
        super(CustomWidget, self).__init__()
        
        self._pixmap = QtGui.QPixmap("C:/.../icons/arrow_down.png")
        
    def paintEvent(self, event):
        painter = qg.QPainter(self)
        painter.drawPixmap(event.rect(), self._pixmap)

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This widget is just being added to a layout however no image is displayed. Everything else I've tried (setting a custom rect object etc) hasn't worked and I have no idea what to do.. any help is greatly appreciated.

Kinds Regards,
Kaine

EDIT:

I just saved my image as a jpeg, and with that same code above, it displays.. however I need to be able to make use of the PNGs alpha channel. My icon is a small arrow, and I want to display JUST the arrow, not any colour around it.