Together with the GTK+ toolkit Gnome provides an extensive
collection of user interface building blocks called widgets.
These are components like text fields, labels, numeric entries, check
buttons, menus, and so on.
In your programming language of choice you access these widgets to
compose a graphical user interface for your application. This often
involves careful programming to place your widgets correctly and to
associate code with actions that are performed on the widget (such as
clicking on a button).
Glade simplifies this task by providing a GUI-based GUI-builder.
With Glade you choose widgets from a graphical palette of available
widgets and place them onto your evolving application window (the
canvas). You edit the properties associated with the widgets through
another graphical interface where you also add the appropriate
connections between your widgets and externally written code. This is
done by identifying the names of functions that will be called when a
widget receives a signal. For example, you can associate a function
that you might call on_button1_clicked with the ``clicked''
signal associated with a button). These functions (callbacks) you code
up in your programming language of choice, whether that be C, C++,
Ada95, Python, Perl, or Eiffel.
When you are happy with how the interface looks you will either
generate the source code that implements the interface you have
created or else you will use a library () that directly
loads the saved description of the interface at run time and
dynamically creates it.
Your main coding task is to write your callbacks (the functionality
behind the interface) and the associated support functions.
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