[Hiki] update - 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")}}
+ ((<Containers|URL:/ja/hiki.cgi?c=plugin;plugin=attach_download;p=tips_toolbar;file_name=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] update - tips_toolbar_icon