protected override void OnElementChanged(ElementChangedEventArgs <TFormsView> e)
{
if (e.OldElement != null)
{
var oldController = (ISKCanvasViewController)e.OldElement;
// unsubscribe from events
oldController.SurfaceInvalidated -= OnSurfaceInvalidated;
oldController.GetCanvasSize -= OnGetCanvasSize;
}
if (e.NewElement != null)
{
var newController = (ISKCanvasViewController)e.NewElement;
// create the native view
if (Control == null)
{
var view = CreateNativeControl();
view.PaintSurface += OnPaintSurface;
SetNativeControl(view);
}
// set the initial values
touchHandler.SetEnabled(Control, e.NewElement.EnableTouchEvents);
#if !__GTK__
// TODO: implement this if it is actually supported
Control.IgnorePixelScaling = e.NewElement.IgnorePixelScaling;
#endif
// subscribe to events from the user
newController.SurfaceInvalidated += OnSurfaceInvalidated;
newController.GetCanvasSize += OnGetCanvasSize;
// paint for the first time
OnSurfaceInvalidated(newController, EventArgs.Empty);
}
base.OnElementChanged(e);
}
protected override void OnElementChanged(ElementChangedEventArgs <TFormsView> e)
{
if (e.OldElement != null)
{
var oldController = (ISKGLViewController)e.OldElement;
// unsubscribe from events
oldController.SurfaceInvalidated -= OnSurfaceInvalidated;
oldController.GetCanvasSize -= OnGetCanvasSize;
oldController.GetGRContext -= OnGetGRContext;
}
if (e.NewElement != null)
{
var newController = (ISKGLViewController)e.NewElement;
// create the native view
if (Control == null)
{
var view = CreateNativeControl();
view.PaintSurface += OnPaintSurface;
SetNativeControl(view);
}
touchHandler.SetEnabled(Control, e.NewElement.EnableTouchEvents);
// subscribe to events from the user
newController.SurfaceInvalidated += OnSurfaceInvalidated;
newController.GetCanvasSize += OnGetCanvasSize;
newController.GetGRContext += OnGetGRContext;
// start the rendering
SetupRenderLoop(false);
}
base.OnElementChanged(e);
}