[Hiki] create - tips_toolbar_icon (ruby-gnome2-doc-cvs) - Ruby-GNOME2

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REMOTE_ADDR = 218.231.205.39
REMOTE_HOST = 
        URL = http://ruby-gnome2.sourceforge.jp/?tips_toolbar_icon
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= Change an icon on a button of a toolbar
Gtk::Toolbar (and also a lot of widgets) is a subclass of Gtk::Container(or Gtk::Bin). They have child widgets and you can get each child widgets and send methods to the child widgets.

Here is a sample script.

 require 'gtk2'

 Gtk.init

 toolbar = Gtk::Toolbar.new
 toolbar.append(Gtk::Stock::NEW) do
   toolbar.children[0].child.children[0].set(Gtk::Stock::QUIT, Gtk::IconSize::SMALL_TOOLBAR)  #(1)
 end
 Gtk::Window.new.add(toolbar).show_all

 Gtk.main

Click button, then icon will be changed.
a line of (1) can also write like as follows:
#Of course, you can use both way as you like.

 button = toolbar.children[0]
 vbox = button.child
 image = vbox.children[0]
 image.set(Gtk::Stock::QUIT, Gtk::IconSize::SMALL_TOOLBAR)

And follow image shows these objects relationship.

{{image_right("containers.jpg")}}
{{br}}

(1) Gtk::Toolbar is a subclass of Gtk::Container. So you can get all child widgets by Gtk::Container#children. Then, the first child is the target object(Gtk::Button). So you get here by toolbar.children[0].
(2) Gtk::Button is a subclass of Gtk::Bin, so it has a child only. You can get the child widget by Gtk::Bin#child. In this case, the child widget is Gtk::VBox.
(3) Gtk::VBox is a subclass of Gtk::Container, too. So you get Gtk::Image by vbox.children[0].
(4) Use Gtk::Image#set to change the icon.

- ((<Masao>))

Ruby-GNOME2

[ruby-gnome2-doc-cvs] [Hiki] create - tips_toolbar_icon