ruby-****@sourc*****
ruby-****@sourc*****
2003年 9月 11日 (木) 16:37:58 JST
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REMOTE_ADDR = 195.0.122.201
REMOTE_HOST =
URL = http://ruby-gnome2.sourceforge.jp/?tips_toolbar_icon
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= Changes 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.
+ Gtk::Toolbar, like a lot of other widgets, is either a subclass of Gtk::Container or Gtk::Bin. They can contain child widgets and you can iterate over each child and send methods to it.
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.
+ Click the button, and then icon will be changed.
+ Instead of line (1) you can also write:
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.
+ Of course, you can use both ways as you like. But the first one uses the Ruby call chaining feature.
+ And the following figure shows relationships amongst these objects:
((<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.
+ (1) Gtk::Toolbar is a subclass of Gtk::Container, so you can get all child widgets by using Gtk::Container#children. Here, the first child is the target object (Gtk::Button), so you can retrieve it with toolbar.children[0].
+ (2) Gtk::Button is a subclass of Gtk::Bin, so it has only one child. You can retrieve the child widget with Gtk::Bin#child. In this case, the child widget is a Gtk::VBox.
+ (3) Gtk::VBox is a also subclass of Gtk::Container. So you get the Gtk::Image object by using vbox.children[0].
+ (4) Finally, use Gtk::Image#set to change the icon.
== ChangeLog
+ :2003-09-11 ((<Laurent|lrz>))
+ Fixed English.
:2003-09-11 ((<Masao>))
Initial release.