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This "hello world" script is simple, but there are some important lessons to be learned from it.
As before, the HelloGUI.rb class has a corresponding glade file, HelloGUI.glade, to add a GUI. It maps like this:
HelloGUI.rb ==> glade/HelloGUI.glade
If you doubleclick on HelloGUI.glade, the file will open, and you can see the button with ID: "ui_hello_btn"
This ID follows a naming convention:
ui = user interface hello = identifier btn = a button
This naming convention isn't required, but it helps distinguish a variable that refers to a widget from one of your variables.
The main program creates an instance of the HelloGUI class and shows it:
HelloGUI.new().show_glade()
The following method uses this ID, such that it runs when the button is clicked:
From HelloGUI.rb:
def ui_hello_btn__clicked(*args) alert("Hello World") end
The name of this method is definately not an accident. It follows a naming convention:
__ # two underscores between ID and event!
So the method, ui_hello_btn__clicked(*args) runs when the button with glade ID "ui_hello_btn" encounters a "clicked" event. To make this work, you only need to create a unique glade ID and name your method correctly. It will call the method based on its name.
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