37 lines
1.0 KiB
C#
37 lines
1.0 KiB
C#
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using System;
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namespace Ooui
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{
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public class Canvas : Element
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{
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Context2d context2d = new Context2d ();
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int gotContext2d = 0;
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public Canvas ()
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: base ("canvas")
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{
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}
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public Context2d GetContext2d ()
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{
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if (System.Threading.Interlocked.CompareExchange (ref gotContext2d, 1, 0) == 0) {
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var mcall = Message.Call (Id, "getContext", "2d");
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mcall.ResultId = context2d.Id;
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Send (mcall);
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}
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return context2d;
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}
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protected override void SaveStateMessageIfNeeded (Message message)
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{
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switch (message.MessageType) {
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case MessageType.Call when message.Key == "getContext" && message.Value is Array a && a.Length == 1 && "2d".Equals (a.GetValue (0)):
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AddStateMessage (message);
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break;
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default:
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base.SaveStateMessageIfNeeded (message);
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break;
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}
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}
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}
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}
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