/// <summary>
/// Sets the <see cref="MapViewModel.VisualState" /> and focuses on the map control if the state is Default.
/// </summary>
private void GoToVisualState(MapViewModel.VisualStates state, bool useTransition = true)
{
switch (state)
{
case MapViewModel.VisualStates.Default:
Map.Focus();
break;
case MapViewModel.VisualStates.Search:
SearchBox.Focus();
break;
case MapViewModel.VisualStates.RouteSelected:
SetViewForRoute(_context.SelectedRoute.Data);
break;
case MapViewModel.VisualStates.Route:
if (FromTextBox.Text.Length == 0)
{
FromTextBox.Focus();
}
else if (ToTextBox.Text.Length == 0)
{
ToTextBox.Focus();
}
break;
}
VisualStateManager.GoToState(this, state.ToString(), useTransition);
}
/// <summary>
/// Called when <see cref="MapViewModel.VisualState" /> property changes in current data context.
/// </summary>
private void OnVisualStateChanged(MapViewModel.VisualStates old, MapViewModel.VisualStates @new)
{
GoToVisualState(@new);
}
/// <summary>
/// Called when <see cref="PhoneApplicationPage.DataContext" /> changes.
/// </summary>
protected override void OnDataContextChanged(object oldValue, object newValue)
{
var old = oldValue as MapViewModel;
if (old != null)
{
old.SearchSucceeded -= OnSearchSucceeded;
old.RouteSucceeded -= SetViewForRoute;
old.SuggestionsRetrieved -= OnSuggestionsRetrieved;
old.VisualState.ValueChanged -= OnVisualStateChanged;
}
var @new = _context = newValue as MapViewModel;
if (@new != null)
{
@new.SearchSucceeded += OnSearchSucceeded;
@new.RouteSucceeded += SetViewForRoute;
@new.SuggestionsRetrieved += OnSuggestionsRetrieved;
@new.VisualState.ValueChanged += OnVisualStateChanged;
GoToVisualState(@new.VisualState.Value, false);
}
base.OnDataContextChanged(oldValue, newValue);
}
