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Page 6 of 7
#!/usr/bin/env ruby
require 'gtk2'
# Make a new hbox filled with button-labels. Arguments for Gtk::HBox.new and
# Gtk::Box#pack_start we are interested are passed in to this method.
def make_box(homogeneous, spacing, expand, fill, padding)
box = Gtk::HBox.new(homogeneous, spacing)
"Gtk::Box#pack_start (button, #{expand}, #{fill}, #{padding})".split(/ /).each do |s|
button = Gtk::Button.new(s)
box.pack_start(button, expand, fill, padding)
end
box
end
# Parse command line argument.
which = ARGV.shift
unless which
$stderr.puts "usage: # num"
$stderr.puts " where num is 1, 2, or 3."
exit 1
end
# Do not forget to initialize Ruby/GTK2!
Gtk.init
# Creates the main window.
window = Gtk::Window.new
# You should always remember to connect the delete_event signal
# to the main window. This is very important for proper intuitive
# behavior.
window.signal_connect("delete_event") do
Gtk::main_quit
false
end
window.border_width = 10
# We create a vertical box (vbox) to pack the horizontal boxes into (created by make_box).
# This allows us to stack the horizontal boxes filled with buttons one
# on top of the other in this vbox.
box1 = Gtk::VBox.new(false, 0)case which.to_i
when 1
# Creates and aligns a new label to the left side.
# We'll discuss this function and others in the section on Widget Attributes.
label = Gtk::Label.new("Gtk::HBox.new(false, 0)")
label.set_alignment(0, 0)
box1.pack_start(label, false, false, 0)
# The 2 first entries are for homegeneous and spacing parameters for Gtk::HBox.new.
# The 3 last entries are for expand, fill and padding parameters for Gtk::HBox#pack_start.
[
[false, 0, false, false, 0],
[false, 0, true, false, 0],
[false, 0, true, true, 0],
].each do |args|
# Create a horizontal box with the specified parameters
# and pack it on top of the vertical box.
box2 = make_box(*args)
box1.pack_start(box2, false, false, 0)
end
# Insert a separator in the vertical box.
separator = Gtk::HSeparator.new
box1.pack_start(separator, false, true, 5)
# Same as previous.
label = Gtk::Label.new("Gtk::HBox.new(true, 0)")
label.set_alignment(0, 0)
box1.pack_start(label, false, false, 0)
[
[true, 0, true, false, 0],
[true, 0, true, true, 0],
].each do |args|
box2 = make_box(*args)
box1.pack_start(box2, false, false, 0)
end
separator = Gtk::HSeparator.new
box1.pack_start(separator, false, true, 5)
when 2
label = Gtk::Label.new("Gtk::HBox.new(false, 10)")
label.set_alignment(0, 0)
box1.pack_start(label, false, false, 0)
[
[false, 10, true, false, 0],
[false, 10, true, true, 0],
].each do |args|
box2 = make_box(*args)
box1.pack_start(box2, false, false, 0)
end
separator = Gtk::HSeparator.new
box1.pack_start(separator, false, true, 5)
label = Gtk::Label.new("Gtk::HBox.new(false, 0)")
label.set_alignment(0, 0)
box1.pack_start(label, false, false, 0)
[
[false, 0, true, false, 10],
[false, 0, true, true, 10],
].each do |args|
box2 = make_box(*args)
box1.pack_start(box2, false, false, 0)
end
separator = Gtk::HSeparator.new
box1.pack_start(separator, false, true, 5)
when 3
# This demonstrates the ability to use Gtk::Box#pack_end to
# right justify widgets. First, we create a new box as before.
box2 = make_box(false, 0, false, false, 0);
# Create a label that will be put at the end.
label = Gtk::Label.new("end")
box2.pack_end(label, false, false, 0)
box1.pack_start(box2, false, false, 0)
# A separator for the bottom.
separator = Gtk::HSeparator.new
# This explicitly sets the separator to 400 pixels wide by 5 pixels
# high. This is so the hbox we created will also be 400 pixels wide,
# and the "end" label will be separated from the other labels in the
# hbox. Otherwise, all the widgets in the hbox would be packed as
# close together as possible.
separator.set_size_request(400, 5)
box1.pack_start(separator, false, true, 5)
end
# Creates a new box, and packs a 'quit' button to it.
# This button can be used to terminate the program, exactly like the window
# close cross.
quitbox = Gtk::HBox.new(false, 0)
button = Gtk::Button.new("Quit")
button.signal_connect("clicked") do
Gtk.main_quit
end
quitbox.pack_start(button, true, false, 0)
box1.pack_start(quitbox, true, false, 0)
window.add(box1)
# Display all widgets.
window.show_all
# As usual, we finish by entering the main loop, with Gtk.main.
Gtk.main
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