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Fri Aug 18 00:18:14 EDT 2017

ViewModel

Running into a case where a viewmodel is needed.  There are 3 view
elements:

- display pane that switches between different pages
- selection box to select the page
- +/- buttons (take this as single view)

This is a nice example because there are 3 different kinds of views:
display only, update only, update+display.

The ViewModel will then be responsible of the state, 
- upon reception of event will update pane and selection box
- can receive event from selection box or +/- buttons

So "view" means here more generally a GUI object which receives
modelview updates and/or sends events to modelview.




From a dataflow point of view, the purpose of the viewmodel is to
convert from networked views to star view-viewmodel, and so it is a
complexity reduction (N^2 -> N+1).





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