Mastering GUI Programming with Python

Animating colors

As you learned earlier in this chapter, widget colors are not properties of the widget – rather they are properties of the palette. The palette cannot be animated, because QPalette is not a subclass of QObject, and because setColor() requires more than just a single value.

Colors are something that we'd like to animate, though; to make that happen, we need to subclass our widget and make its color settings into Qt properties.

Let's do that with a button; start a new class at the top of the script, as follows:

class ColorButton(qtw.QPushButton):    def _color(self):        return self.palette().color(qtg.QPalette.ButtonText)    def _setColor(self, qcolor):        palette = self.palette()        palette.setColor(qtg.QPalette.ButtonText, qcolor) self.setPalette(palette) ...