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# Copyright (c) 2015-2016 Ruby-GNOME2 Project Team
# This program is licenced under the same licence as Ruby-GNOME2.
#
=begin
= Size Groups
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.
=end
class SizegroupDemo
def initialize(main_window)
color_options = %w(Red Green Blue)
dash_options = %w(Solid Dashed Dotted)
end_options = %w(Square Round Double Arrow)
@window = Gtk::Window.new(:toplevel)
@window.screen = main_window.screen
@window.title = "Size Groups"
@window.resizable = false
@vbox = Gtk::Box.new(:vertical, 5)
@window.add(@vbox)
@vbox.border_width = 5
size_group = Gtk::SizeGroup.new(:horizontal)
# Create one frame holding color options
table = initialize_frame("Color Options")
add_row(table, 0, size_group, "_Foreground", color_options)
add_row(table, 1, size_group, "_Background", color_options)
# And another frame holding line style options
table = initialize_frame("Line Options")
add_row(table, 0, size_group, "_Dashing", dash_options)
add_row(table, 1, size_group, "_Line ends", end_options)
# And a check button to turn grouping on and off
check_button = Gtk::CheckButton.new("_Enable grouping")
check_button.set_use_underline(true)
@vbox.pack_start(check_button,
:expand => false, :fill => false, :padding => 0)
check_button.signal_connect("toggled") do |widget|
if widget.active?
size_group.set_mode(:horizontal)
else
size_group.set_mode(:none)
end
end
end
def run
if !@window.visible?
@window.show_all
else
@window.destroy
end
@window
end
private
def initialize_frame(title)
frame = Gtk::Frame.new(title)
@vbox.pack_start(frame, :expand => false, :fill => false, :padding => 0)
table = Gtk::Grid.new
table.set_border_width(5)
table.set_row_spacing(5)
table.set_column_spacing(10)
frame.add(table)
table
end
def add_row(table, row, size_group, label_text, options)
label = Gtk::Label.new(label_text, :use_underline => true)
label.set_halign(:start)
label.set_valign(:baseline)
label.set_hexpand(true)
table.attach(label, 0, row, 1, 1)
combo_box = create_combo_box(options)
label.set_mnemonic_widget(combo_box)
combo_box.set_halign(:end)
combo_box.set_valign(:baseline)
size_group.add_widget(combo_box)
table.attach(combo_box, 1, row, 1, 1)
end
def create_combo_box(options)
combo_box = Gtk::ComboBoxText.new
options.each do |o|
combo_box.append_text(o)
end
combo_box.set_active(0)
combo_box
end
end
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