> Can you give an example of how to do this? I'd love to find a Python-only
> solution for avoiding flickering.
I think I can. Maybe it helps.
Martin Grimme - http://www.pycage.de
-----8<-----------------------------------------------------------------------
# This is only a quick hack of 15 minutes and not the best programming style.
# But I hope it will help illustrating the technique.
from gtk import *
import GdkImlib
class Example(GtkWindow):
def __init__(self):
win = GtkWindow()
win.connect("destroy", mainquit)
self.pic = GtkDrawingArea()
self.pic.show()
win.add(self.pic)
self.pic.connect("expose_event", self.on_exposure)
# change images on mouse button press
self.pic.connect("button_press_event", self.nextPic)
self.pic.set_events(GDK.EXPOSURE_MASK | GDK.BUTTON_PRESS_MASK)
# create three GdkPixmaps, one for buffering and two for both images
self.buffer = create_pixmap(win, 500, 500)
self.pic1 = create_pixmap(win, 500, 500)
self.pic2 = create_pixmap(win, 500, 500)
# create image 1
img = GdkImlib.Image("/home/mg/Pics/asuka.jpg") # use your image here
img.render()
p, m = img.get_pixmap()
gc = self.pic1.new_gc()
draw_pixmap(self.pic1, gc, p, 0, 0, 0, 0, 500, 500)
# create image 2
img = GdkImlib.Image("/home/mg/Pics/flute.jpg") # use your image here
img.render()
p, m = img.get_pixmap()
gc = self.pic2.new_gc()
draw_pixmap(self.pic2, gc, p, 0, 0, 0, 0, 500, 500)
gc = self.buffer.new_gc()
draw_pixmap(self.buffer, gc, self.pic1, 0, 0, 0, 0, 500, 500)
self._o = win._o
# update drawing area when necessary
def on_exposure(self, widget, event):
gc = self.pic.get_style().fg_gc[STATE_NORMAL]
self.pic.draw_pixmap(gc, self.buffer, 0, 0, 0, 0, 500, 500)
# show 2nd image
def nextPic(self, widget, event):
gc = self.buffer.new_gc()
draw_pixmap(self.buffer, gc, self.pic2, 0, 0, 0, 0, 500, 500)
# redraw drawing area
self.pic.queue_draw()
# instantiate an object of the class
example = Example()
example.show()
mainloop()
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