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Tooled Composite  Design Pattern Presentation by Andy Bulka CTO Austhink Software [email_address]
What is this about? ,[object Object]
By GOF author John Vlissides http://www.research.ibm.com/designpatterns/pubs/ph-sep99.pdf
The Problem
“ direct manipulation” metaphor. ,[object Object],[object Object],[object Object],[object Object]
Representing shapes COMPOSITE – design pattern
Representing “Tools” ,[object Object],[object Object],[object Object],[object Object]
Representing “Tools” STATE  – design pattern
How tools and shapes interact ,[object Object],[object Object],[object Object]
Visitor
Visitor ,[object Object],[object Object]
Example Sequence ,[object Object],[object Object],[object Object],ToolHover -------------- VisitShape()   cursor = HAND VisitEdge()   cursor = ARROW
Example Sequence continued ,[object Object],[object Object],[object Object],[object Object]
RTTI as  alternative to Visitor ,[object Object],[object Object],ToolHover -------------- Visit()   if target == Shape  // use of RTTI …   else if target == Edge   …..  ToolHover -------------- VisitShape()   … VisitEdge()   ...
RTTI as  alternative to Visitor ,[object Object],[object Object],[object Object]
Events ,[object Object],[object Object],Classic STATE pattern, passing through method invocations to the current state object
Tooled Composite pattern Rewire events as you swap tools SwapTool(tool)
Event Handling ,[object Object],[object Object]
State Pattern – switching state Notice calls to “SetTool”
Prototype Pattern ,[object Object],[object Object],[object Object]
Command Pattern ,[object Object],[object Object]
Final Pattern
Reflections ,[object Object],[object Object]
Reflections ,[object Object]

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Tooled Composite Design Pattern presentation