Tooled Composite Design Pattern

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

“ 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 ,[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]

Reflections ,[object Object],[object Object]

Tooled Composite Design Pattern

Tooled Composite Design Pattern

Recommended

More Related Content

Viewers also liked

Viewers also liked(12)

Similar to Tooled Composite Design Pattern

Similar to Tooled Composite Design Pattern(20)

Recently uploaded

Recently uploaded(20)

Tooled Composite Design Pattern