From badb5515890123ee871bb6895bc06d3afd5b4c41 Mon Sep 17 00:00:00 2001
From: Shinwoo Kim <cinoo.kim@samsung.com>
Date: Tue, 15 Mar 2022 15:32:49 +0900
Subject: [PATCH] [NUI][AT-SPI] Add ScreenReaderEnabled, Disabled

ScreenReaderEnabled should be distinguished from IsEnabled.
This is because there are things to do only when the screen reader is enabled.
---
 .../src/internal/Interop/Interop.Accessibility.cs  |  7 ++++
 .../src/public/Accessibility/Accessibility.cs      | 45 ++++++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/src/Tizen.NUI/src/internal/Interop/Interop.Accessibility.cs b/src/Tizen.NUI/src/internal/Interop/Interop.Accessibility.cs
index e45066c..f296e1f 100755
--- a/src/Tizen.NUI/src/internal/Interop/Interop.Accessibility.cs
+++ b/src/Tizen.NUI/src/internal/Interop/Interop.Accessibility.cs
@@ -48,11 +48,18 @@ namespace Tizen.NUI
             [return: MarshalAs(UnmanagedType.U1)]
             public static extern bool IsEnabled();
 
+            [DllImport(NDalicPINVOKE.Lib, EntryPoint = "csharp_dali_accessibility_IsScreenReaderEnabled")]
+            [return: MarshalAs(UnmanagedType.U1)]
+            public static extern bool IsScreenReaderEnabled();
+
             [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
             public delegate void EnabledDisabledSignalHandler();
 
             [DllImport(NDalicPINVOKE.Lib, EntryPoint = "csharp_dali_accessibility_RegisterEnabledDisabledSignalHandler")]
             public static extern void RegisterEnabledDisabledSignalHandler(EnabledDisabledSignalHandler enabledSignalHandler, EnabledDisabledSignalHandler disabledSignalHandler);
+
+            [DllImport(NDalicPINVOKE.Lib, EntryPoint = "csharp_dali_accessibility_RegisterScreenReaderEnabledDisabledSignalHandler")]
+            public static extern void RegisterScreenReaderEnabledDisabledSignalHandler(EnabledDisabledSignalHandler enabledSignalHandler, EnabledDisabledSignalHandler disabledSignalHandler);
         }
     }
 }
diff --git a/src/Tizen.NUI/src/public/Accessibility/Accessibility.cs b/src/Tizen.NUI/src/public/Accessibility/Accessibility.cs
index 90eb52d..7a816d0 100755
--- a/src/Tizen.NUI/src/public/Accessibility/Accessibility.cs
+++ b/src/Tizen.NUI/src/public/Accessibility/Accessibility.cs
@@ -46,7 +46,18 @@ namespace Tizen.NUI.Accessibility
                 Disabled?.Invoke(typeof(Accessibility), EventArgs.Empty);
             };
 
+            screenReaderEnabledSignalHandler = () =>
+            {
+                ScreenReaderEnabled?.Invoke(typeof(Accessibility), EventArgs.Empty);
+            };
+
+            screenReaderDisabledSignalHandler = () =>
+            {
+                ScreenReaderDisabled?.Invoke(typeof(Accessibility), EventArgs.Empty);
+            };
+
             Interop.Accessibility.RegisterEnabledDisabledSignalHandler(enabledSignalHandler, disabledSignalHandler);
+            Interop.Accessibility.RegisterScreenReaderEnabledDisabledSignalHandler(screenReaderEnabledSignalHandler, screenReaderDisabledSignalHandler);
         }
         #endregion Constructor
 
@@ -67,6 +78,22 @@ namespace Tizen.NUI.Accessibility
             }
         }
 
+        /// <summary>
+        /// Flag to check whether the state of Screen Reader is enabled or not.
+        /// </summary>
+        /// <remarks>
+        /// Getter returns true if Screen Reader is enabled, false otherwise.
+        /// </remarks>
+        /// This will be public opened after ACR done. (Before ACR, need to be hidden as Inhouse API)
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public static bool IsScreenReaderEnabled
+        {
+            get
+            {
+                return (bool)Interop.Accessibility.IsScreenReaderEnabled();
+            }
+        }
+
         #endregion Property
 
         #region Method
@@ -270,6 +297,20 @@ namespace Tizen.NUI.Accessibility
         [EditorBrowsable(EditorBrowsableState.Never)]
         public static event EventHandler Disabled;
 
+        /// <summary>
+        /// Triggered whenever the value of IsScreenReaderEnabled would change from false to true
+        /// </summary>
+        // This will be public opened after ACR done. (Before ACR, need to be hidden as Inhouse API)
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public static event EventHandler ScreenReaderEnabled;
+
+        /// <summary>
+        /// Triggered whenever the value of IsScreenReaderEnabled would change from true to false
+        /// </summary>
+        // This will be public opened after ACR done. (Before ACR, need to be hidden as Inhouse API)
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public static event EventHandler ScreenReaderDisabled;
+
         #endregion Event, Enum, Struct, ETC
 
         #region Private
@@ -283,6 +324,10 @@ namespace Tizen.NUI.Accessibility
 
         private static Interop.Accessibility.EnabledDisabledSignalHandler disabledSignalHandler = null;
 
+        private static Interop.Accessibility.EnabledDisabledSignalHandler screenReaderEnabledSignalHandler = null;
+
+        private static Interop.Accessibility.EnabledDisabledSignalHandler screenReaderDisabledSignalHandler = null;
+
         private static void SayFinishedEventCallback(int result)
         {
             NUILog.Debug($"sayFinishedEventCallback(res={result}) called!");
-- 
2.7.4