Description Martin Aeschlimann 2001-10-10 22:54:49 EDT

MA (01.10.2001 19:04:48)
	The type hierarchy view contains types and methods. When member filtering is turned on, the
	same view shows types and members.
	For hierarchy changes it listens as a  ITypeHierarchyChangedListener on a ITypeHierarchy,
	for tracking members removes/adds a IElementChangedListener is used.

	In the IElementChangedListener, I need the ITypeHierarchy to find out if my members are involved:
	I process the delta, I check all modified types if they are in the hierarchy, if yes, I have to update the members.
	I assume the hierarchy to be up to date when the IElementChangedListener is called.

	The problem is that a ITypeHierarchyChangedListener is triggered itselve from a IElementChangedListener.
	So when I access the typehierarchy, it could be that the type hierarchy has not yet send the 'hierarchy changed', but
	will immedeatly.
	I have to minimize the refreshes sent to the viewer, so there must be a way for me to synchronize the two change
	notification.

	- The type hierarchy delta can give me the element delta:
		Problem: Member changes does not imply a hierarchy change.

	- The type hierarchy is garuanteed to be processed before all  IElementChangedListener -clients, and the invocation of
	 a ITypeHierarchyChanged implies a IElementChange.
	I could then simply mark the hierarchy dirty when ITypeHierarchyChange comes, and do the update in the 
	IElementChange.

	- type hierarchy also reports member changes, even if the hierarchy itself is the same.


	
	

	



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