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#!/usr/bin/env python
#
# Copyright (C) 2004 Joey Tsai <joeytsai@joeytsai.com>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
"""Images
GtkImage is used to display an image; the image can be in a number of formats.
Typically, you load an image into a GdkPixbuf, then display the pixbuf.
This demo code shows some of the more obscure cases, in the simple case a call
to gtk.Image's set_from_file() is all you need.
"""
import sys
import pygtk
pygtk.require("2.0")
import gobject
import gtk
description = "Images"
def error_dialog(message, parent=None):
dialog = gtk.MessageDialog(parent,
gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,
gtk.MESSAGE_WARNING, gtk.BUTTONS_OK, message)
dialog.run()
dialog.destroy()
def on_timeout(loader, fileobject):
run_again = True
try:
bytes = fileobject.read(256)
loader.write(bytes)
except (IOError, gobject.GError), e:
error_dialog(str(e))
run_again = False
if not bytes:
run_again = False
if not run_again:
try:
fileobject.close()
loader.close()
except gobject.GError, e:
# bug 136989, loader.close() will throw an exception
pass
return run_again
def on_area_prepared(loader, image):
pixbuf = loader.get_pixbuf()
image.set_from_pixbuf(pixbuf)
def on_area_updated(loader, x, y, w, h, image):
image.queue_draw()
def get_progressive_image(filename):
try:
fileobject = open(filename, "r")
except IOError, e:
error_dialog(str(e))
return
image = gtk.Image()
loader = gtk.gdk.PixbufLoader()
loader.connect("area_prepared", on_area_prepared, image)
loader.connect("area_updated", on_area_updated, image)
gobject.timeout_add(150, on_timeout, loader, fileobject)
return image
def get_image(filename):
try:
anim = gtk.gdk.PixbufAnimation(filename)
except gobject.GError, e:
error_dialog(str(e))
return
image = gtk.Image()
if anim.is_static_image():
image.set_from_pixbuf( anim.get_static_image() )
else:
image.set_from_animation( anim )
return image
def align_image(image, label_text):
label = gtk.Label()
label.set_markup("<u>%s</u>" % label_text)
frame = gtk.Frame()
frame.set_shadow_type(gtk.SHADOW_IN)
if image:
frame.add(image)
else:
frame.add(gtk.Label("(No image)"))
align = gtk.Alignment(0.5, 0.5, 0, 0)
align.add(frame)
vbox = gtk.VBox(spacing=8)
vbox.set_border_width(4)
vbox.pack_start(label)
vbox.pack_start(align)
return vbox
def on_button_toggled(button, vbox):
for widget in vbox.get_children():
if widget != button:
widget.set_sensitive(not button.get_active())
def main():
vbox = gtk.VBox()
button = gtk.ToggleButton("_Insensitive")
button.connect("toggled", on_button_toggled, vbox)
i1 = get_image("gtk-logo-rgb.gif")
i2 = get_image("floppybuddy.gif")
i3 = get_progressive_image("alphatest.png")
vbox.pack_start(align_image(i1, "Image loaded from a file"))
vbox.pack_start(align_image(i2, "Animation loaded from a file"))
vbox.pack_start(align_image(i3, "Progressive image loading"))
vbox.pack_start(button)
win = gtk.Window()
win.set_title("Images")
win.set_border_width(8)
win.connect("destroy", gtk.main_quit)
win.add(vbox)
win.show_all()
gtk.main()
return 0
if __name__ == "__main__":
sys.exit(main())
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