[Tizen] Fix the DisplayActionSheet (#12188)

* [Tizen] Fix button style issue in DisplayActionSheet

* [Tizen] Add null check for avoiding null reference exceptions

Xamarin.Forms.Platform.Tizen/PopupManager.cs

@@ -142,10 +142,12 @@ namespace Xamarin.Forms.Platform.Tizen
 				var destruction = new Native.Button(alert)
 				{
 					Text = arguments.Destruction,
-					Style = ButtonStyle.Text,
-					TextColor = EColor.Red,
 					AlignmentX = -1
 				};
+				destruction.SetWatchTextStyle();
+				//TextColor should be set after applying style
+				destruction.TextColor = EColor.Red;
+
 				destruction.Clicked += (s, evt) =>
 				{
 					arguments.SetResult(arguments.Destruction);
@@ -160,9 +162,10 @@ namespace Xamarin.Forms.Platform.Tizen
 				var button = new Native.Button(alert)
 				{
 					Text = buttonName,
-					Style = ButtonStyle.Text,
 					AlignmentX = -1
 				};
+				button.SetWatchTextStyle();
+
 				button.Clicked += (s, evt) =>
 				{
 					arguments.SetResult(buttonName);

Xamarin.Forms.Platform.Tizen/Renderers/EditorRenderer.cs

@@ -114,7 +114,7 @@ namespace Xamarin.Forms.Platform.Tizen
 
 		void UpdateText()
 		{
-			Control.Text = Element.Text;
+			Control.Text = Element.Text ?? "";
 			if (!Control.IsFocused)
 			{
 				Control.MoveCursorEnd();

Xamarin.Forms.Platform.Tizen/Renderers/EntryRenderer.cs

@@ -116,7 +116,7 @@ namespace Xamarin.Forms.Platform.Tizen
 
 		void UpdateText()
 		{
-			Control.Text = Element.Text;
+			Control.Text = Element.Text ?? "";
 			if (!Control.IsFocused)
 			{
 				Control.MoveCursorEnd();
@@ -259,7 +259,7 @@ namespace Xamarin.Forms.Platform.Tizen
 
 		int GetSelectionStart()
 		{
-			int start = Element.Text.Length;
+			int start = Element.Text?.Length ?? 0;
 			int cursorPosition = Element.CursorPosition;
 
 			if (Element.IsSet(Entry.CursorPositionProperty))

Xamarin.Forms.Platform.Tizen/Renderers/LabelRenderer.cs

@@ -84,7 +84,7 @@ namespace Xamarin.Forms.Platform.Tizen
 
 		void UpdateText()
 		{
-			Control.Text = Element.Text;
+			Control.Text = Element.Text ?? "";
 		}
 
 		void UpdateTextColor()

Xamarin.Forms.Platform.Tizen/Renderers/RadioButtonRenderer.cs

@@ -71,7 +71,7 @@ namespace Xamarin.Forms.Platform.Tizen
 
 		void UpdateText(bool isInitialized)
 		{
-			_span.Text = Element.ContentAsString();
+			_span.Text = Element.ContentAsString() ?? "";
 			if (!isInitialized)
 				ApplyTextAndStyle();
 		}

Xamarin.Forms.Platform.Tizen/Renderers/SearchBarRenderer.cs

@@ -175,7 +175,7 @@ namespace Xamarin.Forms.Platform.Tizen
 		/// </summary>
 		void TextPropertyHandler()
 		{
-			Control.Text = Element.Text;
+			Control.Text = Element.Text ?? "";
 		}
 
 		void UpdateKeyboard(bool initialize)

Xamarin.Forms.Platform.Tizen/ThemeConstants.cs

@@ -81,6 +81,7 @@ namespace Xamarin.Forms.Platform.Tizen
 				{
 					public const string PopupLeft = "popup/circle/left_delete";
 					public const string PopupRight = "popup/circle/right_check";
+					public const string Text = "textbutton";
 				}
 			}
 

Xamarin.Forms.Platform.Tizen/ThemeManager.cs

@@ -235,6 +235,17 @@ namespace Xamarin.Forms.Platform.Tizen
 			return button;
 		}
 
+		public static EButton SetWatchTextStyle(this EButton button)
+		{
+			if (Device.Idiom != TargetIdiom.Watch)
+			{
+				Log.Error($"ToWatchPopupRightStyleButton is only supported on TargetIdiom.Watch : {0}", Device.Idiom);
+				return button;
+			}
+			button.Style = ThemeConstants.Button.Styles.Watch.Text;
+			return button;
+		}
+
 		public static bool SetIconPart(this EButton button, EvasObject content, bool preserveOldContent = false)
 		{
 			return button.SetPartContent(ThemeConstants.Button.Parts.Icon, content, preserveOldContent);
@@ -273,6 +284,7 @@ namespace Xamarin.Forms.Platform.Tizen
 			button.SetPartColor(ThemeConstants.Button.ColorClass.Effect, color);
 			button.SetPartColor(ThemeConstants.Button.ColorClass.EffectPressed, color);
 		}
+
 		#endregion
 
 		#region Popup