[Gtk] Add Accessibility support

1 files changed, 142 insertions, 0 deletions

diff --git a/Xwt.Gtk/Xwt.GtkBackend/AccessibleBackend.cs b/Xwt.Gtk/Xwt.GtkBackend/AccessibleBackend.cs
new file mode 100644
index 00000000..ac98f623
--- /dev/null
+++ b/Xwt.Gtk/Xwt.GtkBackend/AccessibleBackend.cs
@@ -0,0 +1,142 @@
+//
+// AccessibleBackend.cs
+//
+// Author:
+//       Vsevolod Kukol <sevoku@microsoft.com>
+//
+// Copyright (c) 2017 Microsoft Corporation
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+using System;
+using Xwt.Accessibility;
+using Xwt.Backends;
+
+namespace Xwt.GtkBackend
+{
+	public class AccessibleBackend : IAccessibleBackend
+	{
+		WidgetBackend backend;
+		IAccessibleEventSink eventSink;
+		ApplicationContext context;
+
+		public AccessibleBackend ()
+		{
+		}
+
+		public void InitializeAccessible (IAccessibleEventSink eventSink)
+		{
+			this.eventSink = eventSink;
+		}
+
+		public void InitializeBackend (object frontend, ApplicationContext context)
+		{
+			this.context = context;
+			var parent = (XwtComponent)frontend;
+			backend = parent.GetBackend () as WidgetBackend;
+		}
+
+		public Rectangle AccessibleBounds {
+			get {
+				int x = 0, y = 0, w = 0, h = 0;
+				(backend.Widget.Accessible as Atk.Component)?.GetExtents (out x, out y, out w, out h, Atk.CoordType.Screen);
+				return new Rectangle (x, y, w, h);
+			}
+			set {
+				(backend.Widget.Accessible as Atk.Component)?.SetExtents ((int)value.X, (int)value.Y, (int)value.Width, (int)value.Height, Atk.CoordType.Screen);
+			}
+		}
+
+		public string AccessibleDescription {
+			get {
+				return backend.Widget.Accessible.Description;
+			}
+			set {
+				backend.Widget.Accessible.Description = value;
+			}
+		}
+
+		public string AccessibleLabel {
+			get {
+				return backend.Widget.Accessible.Name;
+			}
+			set {
+				backend.Widget.Accessible.Name = value;
+			}
+		}
+
+		public Role AccessibleRole {
+			get {
+				return backend.Widget.Accessible.Role.ToXwtRole ();
+			}
+
+			set {
+				backend.Widget.Accessible.Role = value.ToAtkRole ();
+			}
+		}
+
+		public string AccessibleRoleDescription { get; set; }
+
+		public string AccessibleTitle { get; set; }
+
+		public string AccessibleValue {
+			get {
+				if (backend.Widget.Accessible is Atk.Value) {
+					GLib.Value val = GLib.Value.Empty;
+					(backend.Widget.Accessible as Atk.Value)?.GetCurrentValue (ref val);
+					return val.Val.ToString ();
+				}
+				if (backend.Widget.Accessible is Atk.Text) {
+					var atkText = (backend.Widget.Accessible as Atk.Text);
+					return atkText?.GetText (0, atkText.CharacterCount - 1);
+				}
+				return null;
+			}
+			set {
+				if (backend.Widget.Accessible is Atk.Value) {
+					GLib.Value val = GLib.Value.Empty;
+					(backend.Widget.Accessible as Atk.Value)?.SetCurrentValue (new GLib.Value (value));
+				} else if (backend.Widget.Accessible is Atk.EditableText) {
+					var atkText = (backend.Widget.Accessible as Atk.EditableText);
+					atkText.TextContents = value;
+				}
+			}
+		}
+
+		public bool IsAccessible {
+			get {
+				return backend.Widget.Accessible?.Role != Atk.Role.Invalid;
+			}
+			set {
+				// TODO
+				//if (backend.Widget.Accessible != null)
+				//	return backend.Widget.Accessible.Role = Atk.Role.Invalid;
+			}
+		}
+
+		public void DisableEvent (object eventId)
+		{
+			throw new NotImplementedException ();
+		}
+
+		public void EnableEvent (object eventId)
+		{
+			throw new NotImplementedException ();
+		}
+	}
+}