Tooled Composite Design Pattern presentation

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Ever wanted to create a "direct manipulation" program where you select various tools and manipulate stuff on a workspace? These sorts of applications are quite difficult to build due to the many possible combinations of behavior that is needed. Every tool must know what to do with each type of object. How do we manage this sort of complexity? Well the GOF (gang of four) author John Vlissides documented this pattern in this paper http://www.research.ibm.com/designpatterns/pubs/ph-sep99.pdf

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

1. Tooled Composite Design Pattern Presentation by Andy Bulka CTO Austhink Software [email_address]

2.

3. By GOF author John Vlissides http://www.research.ibm.com/designpatterns/pubs/ph-sep99.pdf

5.

6. Representing shapes COMPOSITE – design pattern

7.

8. Representing “Tools” STATE – design pattern

9.

11.

12.

13.

14.

15.

16.

17. Tooled Composite pattern Rewire events as you swap tools SwapTool(tool)

18.

19. State Pattern – switching state Notice calls to “SetTool”

20.

21.

22. Final Pattern

23.

24.