This is Class 4 on a 6 week course I taught on Software Design Patterns. This course goes over Command and Adapter pattern. Class based on "Head First Design Patterns."

1. Design Patterns 05/28/10 Week 4: Command and Adapter Jonathan Simon [email_address]

39. Command Manager 05/28/10 The Commands property contains a list of all possible Commands. CommandsList contains a List object internally for storing each possible Command. It also has a reference to CommandManager.

40. Command Object ExecuteHandler = delegate that represents the logic for executing the actual Command logic. Triggered when the command is executed. Gets associated with OnExecute event. UpdateHandler = delegate that represents the logic for executing the logic to update the state of a command. (For example, Edit  Copy should be enabled if text has been selected). Associated with OnUpdate event.

44. So far.. 05/28/10 Command #1 Tag = “Edit Copy” OnExecute = OnCopy OnUpdate = UpdateCopyCommand Command #2 Tag = “File Open” OnExecute = OnFileOpen OnUpdate = null

46. CommandInstances 05/28/10 Contain a list of all UI Elements associated with a Command

47. So far.. 05/28/10 Command #1 Tag = “Edit Copy” OnExecute = OnCopy OnUpdate = UpdateCopyCommand Two items: mnuEditCopy tlbMain.Buttons[4] All we have done so far is store information…

53. CommandExecutor 05/28/10 Enable() is abstract. Toolbar and Menu subclasses must define how Enable needs to work.