[NUI] Add EnableBackNavigation to Page

To support back navigation automatically, EnableBackNavigation is
added to Page like Navigator.
If EnabledBackNavigation is false, then back button and back key do
not cause back navigation on the page.

diff --git a/src/Tizen.NUI.Components/Controls/Navigation/Navigator.cs b/src/Tizen.NUI.Components/Controls/Navigation/Navigator.cs
index e483a2a..e452a6c 100755 (executable)
--- a/src/Tizen.NUI.Components/Controls/Navigation/Navigator.cs
+++ b/src/Tizen.NUI.Components/Controls/Navigation/Navigator.cs
@@ -884,7 +884,7 @@ namespace Tizen.NUI.Components
         [EditorBrowsable(EditorBrowsableState.Never)]
         protected virtual void OnBackNavigation(BackNavigationEventArgs eventArgs)
         {
-            if (PageCount >= 1)
+            if ((PageCount >= 1) && Peek().EnableBackNavigation)
             {
                 Tizen.Log.Info("NUI", $"Navigator pops the peek page.\n");
                 Pop();

diff --git a/src/Tizen.NUI.Components/Controls/Navigation/Page.cs b/src/Tizen.NUI.Components/Controls/Navigation/Page.cs
index e2227c4..f26a3a4 100755 (executable)
--- a/src/Tizen.NUI.Components/Controls/Navigation/Page.cs
+++ b/src/Tizen.NUI.Components/Controls/Navigation/Page.cs
@@ -94,6 +94,24 @@ namespace Tizen.NUI.Components
             return instance.InternalDisappearingTransition;
         });
 
+        /// <summary>
+        /// EnableBackNavigationProperty
+        /// </summary>
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public static readonly BindableProperty EnableBackNavigationProperty = BindableProperty.Create(nameof(EnableBackNavigation), typeof(bool), typeof(Page), default(bool), propertyChanged: (bindable, oldValue, newValue) =>
+        {
+            var instance = (Page)bindable;
+            if (newValue != null)
+            {
+                instance.InternalEnableBackNavigation = (bool)newValue;
+            }
+        },
+        defaultValueCreator: (bindable) =>
+        {
+            var instance = (Page)bindable;
+            return instance.InternalEnableBackNavigation;
+        });
+
         /// <inheritdoc/>
         [EditorBrowsable(EditorBrowsableState.Never)]
         protected internal BaseComponents.View LastFocusedView = null;
@@ -105,6 +123,8 @@ namespace Tizen.NUI.Components
 
         private TransitionBase disappearingTransition = null;
 
+        private bool enableBackNavigation = true;
+
         /// <summary>
         /// Creates a new instance of a Page.
         /// </summary>
@@ -224,6 +244,35 @@ namespace Tizen.NUI.Components
         /// <since_tizen> 9 </since_tizen>
         public event EventHandler<PageDisappearedEventArgs> Disappeared;
 
+        /// <summary>
+        /// Gets or sets if this page is popped when back button or back key is pressed and released.
+        /// </summary>
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public bool EnableBackNavigation
+        {
+            get
+            {
+                return (bool)GetValue(EnableBackNavigationProperty);
+            }
+            set
+            {
+                SetValue(EnableBackNavigationProperty, value);
+                NotifyPropertyChanged();
+            }
+        }
+
+        private bool InternalEnableBackNavigation
+        {
+            set
+            {
+                enableBackNavigation = value;
+            }
+            get
+            {
+                return enableBackNavigation;
+            }
+        }
+
         internal void InvokeAppearing()
         {
             Appearing?.Invoke(this, new PageAppearingEventArgs());
@@ -314,7 +363,6 @@ namespace Tizen.NUI.Components
                     FocusManager.Instance.SetFocusFinderRootView(this);
                 }
             }
-
         }
 
     }