private void RefreshGraphicsWithTryCatch()
{
try
{
// Bothe Invalidate and _canvas.Invalidate are necessary in different scenarios.
Invalidate();
_canvas?.Invalidate();
}
catch (ObjectDisposedException e)
{
// See issue: https://github.com/Mapsui/Mapsui/issues/433
// What seems to be happening. The Activity is Disposed. Appently it's children get Disposed
// explicitly by something in Xamarin. During this Dispose the MessageCenter, which is itself
// not disposed gets another notification to call RefreshGraphics.
Logger.Log(LogLevel.Warning, "This can happen when the parent Activity is disposing.", e);
}
}
public override View Run()
{
var view = new View
{
Layout = new LinearLayout
{
LinearAlignment = LinearLayout.Alignment.Center,
LinearOrientation = LinearLayout.Orientation.Vertical,
}
};
view.UpdateBackgroundColor(Color.FromHex("#618833"));
var canvas = new SKCanvasView()
{
SizeWidth = 300,
SizeHeight = 300,
};
view.Add(new Label
{
Text = "ImageView"
});
view.Add(canvas);
var glSurface = new SKGLSurfaceView()
{
SizeWidth = 300,
SizeHeight = 300,
};
view.Add(new Label
{
Text = "GL Surface View"
});
view.Add(glSurface);
canvas.PaintSurface += OnPaintSurface;
glSurface.PaintSurface += OnPaintSurface;
var left = new Button
{
Text = "<-"
};
view.Add(left);
left.Clicked += (s, e) =>
{
startX -= 10;
canvas.Invalidate();
glSurface.Invalidate();
};
var right = new Button
{
Text = "->"
};
view.Add(right);
right.Clicked += (s, e) =>
{
startX += 10;
canvas.Invalidate();
glSurface.Invalidate();
};
var add = new Button
{
Text = "+"
};
view.Add(add);
add.Clicked += (s, e) =>
{
canvas.SizeWidth += 30;
glSurface.SizeWidth += 30;
};
return(view);
}