protected override void OnElementChanged(ElementChangedEventArgs <View> e)
{
base.OnElementChanged(e);
if (e.NewElement != null)
{
if (e.NewElement is PencilKitView pkView)
{
var bounds = e.NewElement.Bounds;
//Provides the drawable region
var pkPencilView = new PKCanvasView();
pkPencilView.Frame = new CoreGraphics.CGRect(bounds.X, bounds.Y, bounds.Width, bounds.Height);
//PKDrawing - Data Model. Captures all the beautiful strokes
//PKToolPicker - The main tool kit
//PKTools - Provides inks
pkPencilView.Tool = new PKInkingTool(PKInkType.Pen, UIKit.UIColor.Blue, 40);
SetNativeControl(pkPencilView);
}
}
}
public override void ViewWillAppear(bool animated)
{
base.ViewWillAppear(animated);
var canvas = new PKCanvasView();
var window = GetWindow();
var tool = PKToolPicker.GetSharedToolPicker(window);
tool.SetVisible(true, canvas);
tool.AddObserver(canvas);
canvas.BecomeFirstResponder();
View.FillWith(canvas);
}
public override void DrawingDidChange(PKCanvasView canvasView)
{
if (!(canvasView is PKEventingCanvasView pk))
{
return;
}
var rect = new CGRect(new CGPoint(0, 0), canvasView.Frame.Size);
var img = canvasView.Drawing.GetImage(rect, 1);
if (img != null && !pk.SuppressChanges)
{
pk.OnImage?.Invoke(img);
}
}
