仿真平台内核初版 -tlib库 包含<sparc arm riscv powerPC>

lib/termsharp/xwt/Xwt.Gtk.Mac/GtkMacAccessibleBackend.AccessibilityHelper.cs

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+using System;
+using Xwt.GtkBackend;
+using Xwt.Mac;
+
+namespace Xwt.Gtk.Mac
+{
+	public partial class GtkMacAccessibleBackend : AccessibleBackend
+	{
+		static AccerssibilityHelper a11yHelper;
+		static GtkMacAccessibleBackend ()
+		{
+			a11yHelper = new AccerssibilityHelper ();
+		}
+
+		public override void MakeAnnouncement (string message, bool polite = false)
+		{
+			a11yHelper.MakeAnnouncement (message, polite);
+		}
+
+		public override bool AccessibilityInUse => a11yHelper.AccessibilityInUse;
+
+		public override event EventHandler AccessibilityInUseChanged
+		{
+			add
+			{
+				a11yHelper.AccessibilityInUseChanged += value;
+			}
+			remove
+			{
+				a11yHelper.AccessibilityInUseChanged -= value;
+			}
+		}
+	}
+}