PyQt button click area (Non rectangular area) - button

Question

I was working on a PySide interface for Maya and i was wondering if its possible to define a NON RECTANGULAR clickeable area for a button.
I tried using QPushButton and also extending a QLabel object to get button behavior but do you know if its possible to get a button containing a picture with alpha channel and use that alpha to define the click area for a button?
I'd appreciate a lot if you can guide me through how to solve this problem.
Thanks in advance.
I've tried this...
from PySide import QtCore
from PySide import QtGui
class QLabelButton(QtGui.QLabel):
def __init(self, parent):
QtGui.QLabel.__init__(self, parent)
def mousePressEvent(self, ev):
self.emit(QtCore.SIGNAL('clicked()'))
class CustomButton(QtGui.QWidget):
def __init__(self, parent=None, *args):
super(CustomButton, self).__init__(parent)
self.setMinimumSize(300, 350)
self.setMaximumSize(300, 350)
picture = __file__.replace('qbtn.py', '') + 'mario.png'
self.button = QLabelButton(self)
self.button.setPixmap(QtGui.QPixmap(picture))
self.button.setScaledContents(True)
self.connect(self.button, QtCore.SIGNAL('clicked()'), self.onClick)
def onClick(self):
print('Button was clicked')
if __name__ == '__main__':
app = QApplication(sys.argv)
win = CustomButton()
win.show()
app.exec_()
sys.exit()
mario.png

Answer 1

This is the final code i get to solve my above question...
from PySide import QtCore
from PySide import QtGui
class QLabelButton(QtGui.QLabel):
def __init(self, parent):
QtGui.QLabel.__init__(self, parent)
def mousePressEvent(self, ev):
self.emit(QtCore.SIGNAL('clicked()'))
class CustomButton(QtGui.QWidget):
def __init__(self, parent=None, *args):
super(CustomButton, self).__init__(parent)
self.setMinimumSize(300, 350)
self.setMaximumSize(300, 350)
pixmap = QtGui.QPixmap('D:\mario.png')
self.button = QLabelButton(self)
self.button.setPixmap(pixmap)
self.button.setScaledContents(True)
self.button.setMask(pixmap.mask()) # THIS DOES THE MAGIC
self.connect(self.button, QtCore.SIGNAL('clicked()'), self.onClick)
def onClick(self):
print('Button was clicked')

Answer 2

You can do this by catching the press/release events and checking the position of the click with the value of the pixel in the image to decide if the widget should emit a click or not.
class CustomButton(QWidget):
def __init__(self, parent, image):
super(CustomButton, self).__init__(parent)
self.image = image
def sizeHint(self):
return self.image.size()
def mouseReleaseEvent(self, event):
# Position of click within the button
pos = event.pos()
# Assuming button is the same exact size as image
# get the pixel value of the click point.
pixel = self.image.alphaChannel().pixel(pos)
if pixel:
# Good click, pass the event along, will trigger a clicked signal
super(CustomButton, self).mouseReleaseEvent(event)
else:
# Bad click, ignore the event, no click signal
event.ignore()