Following the tutorial for drawing widgets with Cairo found at [1], I created a widget and then noticed some odd behavior when trying to render it.
When inserted into a window by itself, the widget rendered, but in more complex setups it did not. I created and attached a test script to demonstrate this problem. In it the widget and a button are added to a window in that order and render correctly. The order is then reversed and only the button is rendered. I would be grateful for any thoughts on what's going on. Please CC me on any responses. Cheers, Adam [1]http://www.pygtk.org/articles/cairo-pygtk-widgets/cairo-pygtk-widgets.htm
#!/usr/bin/env python
import gtk
import math
class Bar(gtk.DrawingArea):
def __init__(self):
gtk.DrawingArea.__init__(self)
self.connect("expose_event", self.expose)
def expose(self, widget, event):
self.context = widget.window.cairo_create()
# set a clip region for the expose event
self.context.rectangle(event.area.x, event.area.y,
event.area.width, event.area.height)
self.context.clip()
self.draw(self.context)
return False
def draw(self, context):
rect = self.get_allocation()
print "width = {0}, height = {1}, x = {2}, y = {3}".format(rect.width,rect.height, rect.x, rect.y)
context.rectangle(gtk.gdk.Rectangle(rect.x + rect.width/3,
rect.y + 5,
rect.width/3,
rect.height - 10))
context.set_source_rgba(0.0, 0.0, 0.0, 0.25)
context.fill_preserve()
context.set_source_rgba(0.0, 0.0, 0.0, 1.0)
context.stroke()
def main():
window = gtk.Window()
window.set_default_size(200, 200)
vbox = gtk.VBox()
hbox = gtk.HBox()
button = gtk.Button()
bar = Bar()
hbox.add(bar)
hbox.add(button)
vbox.add(hbox)
window.add(vbox)
window.connect("destroy", gtk.main_quit)
window.show_all()
window = gtk.Window()
window.set_default_size(200, 200)
vbox = gtk.VBox()
hbox = gtk.HBox()
button = gtk.Button()
bar = Bar()
hbox.add(button)
hbox.add(bar)
vbox.add(hbox)
window.add(vbox)
window.connect("destroy", gtk.main_quit)
window.show_all()
gtk.main()
if __name__ == "__main__":
main()
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