Question

I am working on some ‘call-control’ application to be developed in wpf.
I want to implement state machine pattern in my C# code for following purpose:

there are various states as mentioned in following figure.

when call is in ‘ringing‘ state and I click on answer button, state goes into ‘Talk‘ and button gets disabled.
Please provide me useful links/documents that will help me. Is there any built in state class for implementing this?
Thanks in adv.

Answer 1

VisualStateManager is the thing which design specifically to handle visual application states.

here’s where you start with it:
http://msdn.microsoft.com/en-us/library/system.windows.visualstatemanager.aspx

and here’s a good tutorial (doesn’t require Blend):
http://windowsclient.net/wpf/wpf35/wpf-35sp1-toolkit-visual-state-manager-overview.aspx

you can do a lot of cool things including animated transitions between states etc.

For the actual implementation it’s got little to do with WPF – I’d suggest looking at state pattern (ex. http://forum.unity3d.com/threads/38956-Very-Simple-StateMachine-Pattern-C and many others).