public Visibility IsRecognized(DemoScreenState dss)
{
return(dss == DemoScreenState.Recognized ? Visibility.Visible : Visibility.Collapsed);
}
public Visibility IsFace(DemoScreenState dss)
{
return(dss != DemoScreenState.NoFace ? Visibility.Visible : Visibility.Collapsed);
}
public Visibility IsSelectionOrSelected(DemoScreenState dss)
{
return((dss == DemoScreenState.Selection || dss == DemoScreenState.RightSelected || dss == DemoScreenState.LeftSelected) ? Visibility.Visible : Visibility.Collapsed);
}
public Visibility IsRightSelected(DemoScreenState dss)
{
return(dss == DemoScreenState.RightSelected ? Visibility.Visible : Visibility.Collapsed);
}
public Visibility IsSelection(DemoScreenState dss)
{
return(dss == DemoScreenState.Selection ? Visibility.Visible : Visibility.Collapsed);
}
public Visibility IsGreeting(DemoScreenState dss)
{
return(dss == DemoScreenState.Greeting || dss == DemoScreenState.NoFaceGreeting ? Visibility.Visible : Visibility.Collapsed);
}
/// <summary>
/// Change the current state of UI, if allowed by timeouts
/// </summary>
/// <param name="newState">the state to change to</param>
/// <param name="ci">customer informatiom</param>
/// <param name="force">always change the state and update timer</param>
/// <returns>true iff the change was "officially" made (timeouts are reset)</returns>
/// Note: we want to prevent too frequent updates here so the customer can react to the prompts
public bool Update(DemoScreenState newState, CustomerInfo ci = null, bool force = false)
{
if (!force)
{
// Take care of the cases when there is no real change of state
if (newState == CurrentScreenState)
{
if (newState == DemoScreenState.Recognized)
{
if (ci != null && lastCustomerInfo != null)
{
if (ci.CustomerName == lastCustomerInfo.CustomerName &&
ci.CustomerFaceHash == lastCustomerInfo.CustomerFaceHash)
{
return(false); // same customer as before - keep waiting for change of state
}
}
}
else
{
return(false); // keep waiting for change of state
}
}
// Delay state change upon ofering user a choice or giving instructions
TimeSpan sinceLastUpdate = DateTime.Now - lastStateChangeTime;
switch (CurrentScreenState)
{
case DemoScreenState.Greeting:
if (newState != DemoScreenState.Selection &&
newState != DemoScreenState.LeftSelected &&
newState != DemoScreenState.RightSelected)
{
if (sinceLastUpdate.TotalMilliseconds < 10000)
{
return(false); // stay with greeting for some time if user does not act
}
}
break;
case DemoScreenState.Selection:
if (newState != DemoScreenState.LeftSelected &&
newState != DemoScreenState.RightSelected &&
newState != DemoScreenState.NoFaceGreeting)
{
if (sinceLastUpdate.TotalMilliseconds < 15000)
{
return(false); // stay with selection for some time if user does not act
}
}
break;
case DemoScreenState.LeftSelected:
case DemoScreenState.RightSelected:
if (newState != DemoScreenState.Selection)
{
if (sinceLastUpdate.TotalMilliseconds < 9000)
{
return(false); // let user to read directions, unless they chose to go back to selection
}
}
break;
case DemoScreenState.Recognized:
if (sinceLastUpdate.TotalMilliseconds < 10000)
{
return(false); // let user to read directions
}
break;
default:
break;
}
}
// Now do change the state
switch (newState)
{
case DemoScreenState.NoFace:
CustomerPrompt = "";
break;
case DemoScreenState.Greeting:
CustomerPrompt = CustomerPromptNoRecognized;
break;
case DemoScreenState.Selection:
UpdateSelectionOfferedSubstate();
break;
case DemoScreenState.Recognized:
UpdateRecognizedSubstate(ci);
break;
case DemoScreenState.LeftSelected:
UpdateSelectedSubstate("left");
break;
case DemoScreenState.RightSelected:
UpdateSelectedSubstate("right");
break;
}
lastStateChangeTime = DateTime.Now;
CurrentScreenState = newState;
return(true);
}
