private static void SelectedBusStopChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs args)
{
BusStopControlViewModel lastSelected = args.OldValue as BusStopControlViewModel;
if (lastSelected != null)
{
lastSelected.IsSelected = false;
}
BusStopControlViewModel newSelected = args.NewValue as BusStopControlViewModel;
if (newSelected != null)
{
newSelected.IsSelected = true;
// Make sure the new view model is bound to an existing control.
// If it's not then we need to find the one that is and make it selected:
MapControl mapControl = (MapControl)dependencyObject;
var busStop = (from child in mapControl.map.Children
let currentBusStop = child as BusStop
where currentBusStop != null
let busStopControlViewModel = currentBusStop.ViewModel
where busStopControlViewModel != null &&
string.Equals(busStopControlViewModel.StopId, newSelected.StopId, StringComparison.OrdinalIgnoreCase) &&
busStopControlViewModel != newSelected
select currentBusStop).FirstOrDefault();
// This means we have a control that matches the selected control, but it is not
// the same view model.
if (busStop != null)
{
busStop.ViewModel = newSelected;
}
}
}
/// <summary>
/// Clears the view model when we're unloaded.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OnUnloaded(object sender, RoutedEventArgs e)
{
if (this.viewModel != null)
{
this.viewModel.PropertyChanged -= OnViewModelPropertyChanged;
this.viewModel = null;
}
}
private static async void BusStopsChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs args)
{
var mapControl = dependencyObject as MapControl;
if (args.NewValue == null)
{
mapControl.displayedBusStopLookup.Clear();
mapControl.map.Children.Clear();
mapControl.map.Children.Add(mapControl.userLocationIcon);
MapLayer.SetPosition(mapControl.userLocationIcon, mapControl.userLocation);
}
else
{
MapControlViewModel mapControlViewModel = (MapControlViewModel)mapControl.DataContext;
var stops = args.NewValue as BusStopList;
if (stops.ClearExistingStops)
{
// If the clear existing stops property is set to true,
// then we should clear the existing stops:
mapControl.map.Children.Clear();
mapControl.displayedBusStopLookup.Clear();
}
foreach (var stop in stops)
{
// If we're not already displaying this bus stop then add it to the list:
if (!mapControl.displayedBusStopLookup.Contains(stop.StopId))
{
BusStopControlViewModel busStopControlViewModel = new BusStopControlViewModel(stop);
if (mapControlViewModel.SelectedBusStop != null)
{
busStopControlViewModel.IsSelected = string.Equals(mapControlViewModel.SelectedBusStop.StopId, stop.StopId, StringComparison.OrdinalIgnoreCase);
if (busStopControlViewModel.IsSelected)
{
mapControlViewModel.SelectedBusStop = busStopControlViewModel;
}
}
BusStop busStopIcon = new BusStop();
busStopIcon.ViewModel = busStopControlViewModel;
mapControl.map.Children.Add(busStopIcon);
// Wait for the UI to idle before we add another bus stop to make the UI more responsive:
await mapControl.uiHelper.WaitForIdleAsync();
mapControl.displayedBusStopLookup.Add(stop.StopId);
MapLayer.SetPosition(busStopIcon, new Location(stop.Latitude, stop.Longitude));
}
}
}
}
