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#!/usr/bin/env python
"""Size Group
GtkSizeGroup provides a mechanism for grouping a number of widgets together so
they all request the same amount of space. This is typically useful when you
want a column of widgets to have the same size, but you can't use a GtkTable
widget.
Note that size groups only affect the amount of space requested, not the size
that the widgets finally receive. If you want the widgets in a GtkSizeGroup to
actually be the same size, you need to pack them in such a way that they get
the size they request and not more. For example, if you are packing your
widgets into a table, you would not include the GTK_FILL flag."""
import gtk
class SizeGroupDemo(gtk.Dialog):
def __init__(self, parent=None):
gtk.Dialog.__init__(self, "Size Groups", parent,
0,
(gtk.STOCK_CLOSE, gtk.RESPONSE_CLOSE))
try:
self.set_screen(parent.get_screen())
except AttributeError:
self.connect('destroy', lambda *w: gtk.main_quit())
self.connect('response', lambda d, r: d.destroy())
self.set_resizable(False)
vbox = gtk.VBox(False, 5)
self.vbox.pack_start(vbox, True, True, 0)
vbox.set_border_width(5)
self.size_group = gtk.SizeGroup(gtk.SIZE_GROUP_HORIZONTAL)
# Create one frame holding color options
frame = gtk.Frame("Color options")
vbox.pack_start(frame, True, True, 0)
table = gtk.Table(2, 2, False)
table.set_border_width(5)
table.set_row_spacings(5)
table.set_col_spacings(10)
frame.add(table)
color_options = ("Red", "Green", "Blue")
self.__add_row(table, 0, "_Foreground", color_options)
self.__add_row(table, 1, "_Background", color_options)
# And another frame holding line style options
frame = gtk.Frame("Line options")
vbox.pack_start(frame, False, False, 0)
table = gtk.Table(2, 2, False)
table.set_border_width(5)
table.set_row_spacings(5)
table.set_col_spacings(10)
frame.add(table)
dash_options = ("Solid", "Dashed", "Dotted")
end_options = ("Square", "Round", "Arrow")
self.__add_row(table, 0, "_Dashing", dash_options)
self.__add_row(table, 1, "_Line ends", end_options)
# And a check button to turn grouping on and off
check_button = gtk.CheckButton("_Enable grouping")
vbox.pack_start(check_button, False, False, 0)
check_button.set_active(True)
check_button.connect('toggled', self.on_toggle_grouping)
self.show_all()
def __create_option_menu(self, options):
option_menu = gtk.combo_box_new_text()
for opt in options:
option_menu.append_text(opt)
option_menu.set_active(0)
return option_menu
def __add_row(self, table, row, label_text, options):
label = gtk.Label(label_text)
label.set_use_underline(True)
label.set_alignment(0, 1)
table.attach(label, 0, 1, row, row + 1, gtk.EXPAND | gtk.FILL, 0, 0, 0)
option_menu = self.__create_option_menu(options)
label.set_mnemonic_widget(option_menu)
self.size_group.add_widget(option_menu)
table.attach(option_menu, 1, 2, row, row + 1, 0, 0, 0, 0)
def on_toggle_grouping(self, check_button):
# gtk.SIZE_GROUP_NONE is not generally useful, but is useful
# here to show the effect of gtk.SIZE_GROUP_HORIZONTAL by
# contrast.
if check_button.get_active():
self.size_group.set_mode(gtk.SIZE_GROUP_HORIZONTAL)
else:
self.size_group.set_mode(gtk.SIZE_GROUP_NONE)
def main():
SizeGroupDemo()
gtk.main()
if __name__ == '__main__':
main()
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