Owner draw controls Windows Phone-Windows Store app - windows-phone-8

Question

I started developing a Windows 8 (Metro style)-Windows Phone 8 application that will have (between the other things) a multilayer image editor. The problem is that this thing would be pretty easy with owner draw controls...but i can't find anything like that :O
I searched everywhere, but there is not something like the OnPaint/OnDraw/OnRender/OnXXXX or things like that! Am i missing something?
Thanks to everybody!
Side Note:
For my use case I founded a workaround, a Canvas with a WritableBitmap, this way I can have a "raster" surface instead of the list of items. Other than this I use the WritableBitmapEx that wraps the WritableBitmap with all the various APIs like DrawLine, Ellipse, etc..

Answer 1

You are right there is no OnPaint/OnDraw/OnRender in Windows Phone App.
If you want to keep it strictly XAML the best thing you can do is make your custom control
from the Canvas object like this.
<Canvas x:Name="my_canvas">
<Rectangle Fill="Red" Width="100" Height="100" Canvas.Top="100" Canvas.Left="100" />
<Rectangle Fill="Orange" Width="100" Height="100" Canvas.Top="100" Canvas.Left="200" />
<!-- more ui elements -->
</Canvas>
You can programmatically add in items using C# by doing this (it can get really tedious if you're drawing a lot of objects... like say drawing a fine stock chart)
this.my_canvas.Children.Add(my_ui_element);
There is also Windows Phone XNA which I used for a game I have uploaded to the store. In there you will have to deal with a gaming loop and content pipeline which is not easy.