Tim Van Wassenhove home

A long time ago i read Build your own CAB series and recently i noticed that there is a wiki: Presentation Patterns Wiki! and it inspired me to experiment with state machines. Here are a couple of examples:

controlStateMachine = new ControlStateMachine<states>(this);

controlStateMachine.AfterEachStateChange()
.Do(MakeRelevantButtonsVisible);

controlStateMachine.WhenStateChangesTo(States.RetrievingSubscriptionPeriod)
.TheOnlyVisibleControlsAre(flowLayoutPanel1, datePicker1);

controlStateMachine.WhenStateChangesTo(States.RetrievingCustomerInformation)
.MakeVisible(customerInput1)
.Do(() => customerInput1.Dock = DockStyle.Fill);

controlStateMachine.WhenStateChangesTo(States.Ready)
.MakeInvisible(customerInput1);

And here is another example:

wizardStateMachine = new WizardStateMachine<states>(controlStateMachine);

wizardStateMachine.InState(States.RetrievingSubscriptionPeriod)
.OnCommand(WizardCommands.Next)
.TransitionTo(States.RetrievingCustomerInformation);

wizardStateMachine.InState(States.RetrievingCustomerInformation)
.OnCommand(WizardCommands.Back)
.TransitionTo(States.RetrievingSubscriptionPeriod)
.OnCommand(WizardCommands.Finish)
.TransitionTo(States.Ready);

wizardStateMachine.InState(States.Ready)
.OnCommand(WizardCommands.New)
.Do(() => MessageBox.Show("Currently not supported"));

Stay tuned for future posts where i describe the problem space that have lead to this API.