Graphical Editing Framework: Difference between revisions

Revision as of 12:15, 10 January 2008

Revision as of 19:22, 3 April 2008

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This is achieved using [[Chain-of-responsibility pattern|Chain of responsibility]] over Editpolicies, the editpolicies determine if they can handle the request, else pass on to the next editpolicy. The order of declaration of editpolicies determine the order in which the request is passed around. The capable editpolicy creates a command. This command is handed back to the tool which initiated the "Request". Execution of the command causes the model to be modified (Response).

One anotherother mechanism to achieve the same is to create Requests programatically and hand them over to Editparts. The command generated can be subsequently executed on the "CommandStack". ''See [[Command pattern|Using Commands]], CommandStack holds references to commands that were previously executed. This helps in "undo", "redo" of commands.''

== GEF Design patterns ==