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5.3. Examples

Four complete examples are presented that demonstrate several different techniques for using UIL with Python.

• The "Simple Button using AddCallback" example shows how to use UIL to build a widget hierarchy but use the Python AddCallback method to add callbacks to the UIL-created widgets.
• The "Simple Button using PyEval" example shows how to use the Mrm-registered function PyEval() in place of the Python AddCallback method to add callbacks to widgets directly from UIL. This illustrates a powerful feature of the Mrm binding---the ability to connect to predefined Python functions without writing any code.
• The "Simple Button using PyRegister" example shows the use of PyRegister to declare a Python function to be a Mrm-registered callback function. This capability is useful for prototyping in UIL where the prototype will eventually be ported---the callbacks are migrated from Python code to C or C++, but the UIL remains the same.
• The "Command Line Program Front End" example shows the use of the MrmNcreateCallback and the __widget__ symbol to enter the Python widget objects for widgets created in UIL into a Python symbol dictionary.

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