/// <summary>
/// Creates a new shape
/// </summary>
/// <param name="viewModel"></param>
/// <returns></returns>
private MapShape CreateShape(object viewModel)
{
var path = GetPathValue(viewModel);
if (path != null && path.Any())
{
var newShape = CreateDrawable(viewModel, path);
newShape.Tapped += ShapeTapped;
MapElementProperties.SetViewModel(newShape, viewModel);
MapElementProperties.SetLayerName(newShape, LayerName);
// Listen to property changed event of geometry property to check if the shape needs to
// be redrawed
var evt = viewModel.GetType().GetRuntimeEvent("PropertyChanged");
if (evt != null)
{
Observable.FromEventPattern <PropertyChangedEventArgs>(viewModel, "PropertyChanged")
.Subscribe(se =>
{
if (se.EventArgs.PropertyName == PathPropertyName)
{
ReplaceShape(se.Sender);
}
});
}
return(newShape);
}
return(null);
}
private void RemoveShape(object viewModel)
{
var shape = _mapLayer.Shapes.FirstOrDefault(p => MapElementProperties.GetViewModel(p) == viewModel);
if (shape != null)
{
_mapLayer.Shapes.Remove(shape);
shape.Tapped -= ShapeTapped;
}
}
private void ShapeTapped(object sender, TappedRoutedEventArgs e)
{
var shape = sender as MapShape;
if (shape != null)
{
var viewModel = MapElementProperties.GetViewModel(shape);
if (viewModel != null)
{
FireViewmodelCommand(viewModel, TapCommand);
}
}
}
private void ReplaceShape(object viewModel)
{
var shape = _mapLayer.Shapes.FirstOrDefault(p => MapElementProperties.GetViewModel(p) == viewModel);
if (shape != null)
{
var shapeLocation = _mapLayer.Shapes.IndexOf(shape);
if (shapeLocation != -1)
{
var newShape = CreateShape(viewModel);
if (newShape != null)
{
_mapLayer.Shapes[shapeLocation].Tapped -= ShapeTapped;
_mapLayer.Shapes[shapeLocation] = CreateShape(viewModel);
}
}
}
else
{
AddNewShape(viewModel);
}
}