Ooui-tws-port/Ooui/Canvas.cs

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C#
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using System;
namespace Ooui
{
public class Canvas : Element
{
CanvasRenderingContext2D context2d = new CanvasRenderingContext2D ();
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int gotContext2d = 0;
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int width = 300;
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public int Width {
get => width;
set => SetProperty (ref width, value <= 0 ? 150 : value, "width");
}
int height = 150;
public int Height {
get => height;
set => SetProperty (ref height, value <= 0 ? 150 : value, "height");
}
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public Canvas ()
: base ("canvas")
{
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context2d.MessageSent += Send;
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}
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public CanvasRenderingContext2D GetContext2D ()
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{
if (System.Threading.Interlocked.CompareExchange (ref gotContext2d, 1, 0) == 0) {
var mcall = Message.Call (Id, "getContext", "2d");
mcall.ResultId = context2d.Id;
Send (mcall);
}
return context2d;
}
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protected override bool SaveStateMessageIfNeeded (Message message)
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{
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if (message.TargetId == Id) {
switch (message.MessageType) {
case MessageType.Call when message.Key == "getContext" && message.Value is Array a && a.Length == 1 && "2d".Equals (a.GetValue (0)):
AddStateMessage (message);
break;
}
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}
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return base.SaveStateMessageIfNeeded (message);
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}
}
}