Add Button Style

 - Add Button Style(Circle, Bottom)
 - Approval of the RFC is required.
   (http://suprem.sec.samsung.net/confluence/display/SPTDTLC/%5BFormsTizen%5D+RFC+2+-+Button+Style)

Change-Id: I545e0cc2417298f90468b651030937665f547105
Signed-off-by: Seunghyun Choi <sh4682.choi@samsung.com>

5 files changed, 113 insertions, 2 deletions

diff --git a/Xamarin.Forms.Core/PlatformConfiguration/TizenSpecific/Button.cs b/Xamarin.Forms.Core/PlatformConfiguration/TizenSpecific/Button.cs
new file mode 100644
index 00000000..e74650fc
--- /dev/null
+++ b/Xamarin.Forms.Core/PlatformConfiguration/TizenSpecific/Button.cs
@@ -0,0 +1,30 @@
+namespace Xamarin.Forms.PlatformConfiguration.TizenSpecific
+{
+	using FormsElement = Forms.Button;
+
+	public static class Button
+	{
+		public static readonly BindableProperty ButtonStyleProperty = BindableProperty.Create("ButtonStyle", typeof(ButtonStyle), typeof(FormsElement), ButtonStyle.Default);
+
+		public static ButtonStyle GetButtonStyle(BindableObject element)
+		{
+			return (ButtonStyle)element.GetValue(ButtonStyleProperty);
+		}
+
+		public static void SetButtonStyle(BindableObject element, ButtonStyle value)
+		{
+			element.SetValue(ButtonStyleProperty, value);
+		}
+
+		public static ButtonStyle GetButtonStyle(this IPlatformElementConfiguration<Tizen, FormsElement> config)
+		{
+			return GetButtonStyle(config.Element);
+		}
+
+		public static IPlatformElementConfiguration<Tizen, FormsElement> SetButtonStyle(this IPlatformElementConfiguration<Tizen, FormsElement> config, ButtonStyle value)
+		{
+			SetButtonStyle(config.Element, value);
+			return config;
+		}
+	}
+}
diff --git a/Xamarin.Forms.Core/PlatformConfiguration/TizenSpecific/ButtonStyle.cs b/Xamarin.Forms.Core/PlatformConfiguration/TizenSpecific/ButtonStyle.cs
new file mode 100644
index 00000000..abe7bd81
--- /dev/null
+++ b/Xamarin.Forms.Core/PlatformConfiguration/TizenSpecific/ButtonStyle.cs
@@ -0,0 +1,9 @@
+namespace Xamarin.Forms.PlatformConfiguration.TizenSpecific
+{
+	public enum ButtonStyle
+	{
+		Default,
+		Circle,
+		Bottom
+	}
+}
diff --git a/Xamarin.Forms.Core/Xamarin.Forms.Core.csproj b/Xamarin.Forms.Core/Xamarin.Forms.Core.csproj
index 8f217e58..eef2d8f7 100644
--- a/Xamarin.Forms.Core/Xamarin.Forms.Core.csproj
+++ b/Xamarin.Forms.Core/Xamarin.Forms.Core.csproj
@@ -100,6 +100,8 @@
     <Compile Include="PlatformConfiguration\iOSSpecific\UIStatusBarAnimation.cs" />
     <Compile Include="PlatformConfiguration\iOSSpecific\VisualElement.cs" />
     <Compile Include="PlatformConfiguration\TizenSpecific\ProgressBar.cs" />
+    <Compile Include="PlatformConfiguration\TizenSpecific\Button.cs" />
+    <Compile Include="PlatformConfiguration\TizenSpecific\ButtonStyle.cs" />
     <Compile Include="PlatformConfiguration\WindowsSpecific\MasterDetailPage.cs" />
     <Compile Include="PlatformConfiguration\WindowsSpecific\CollapseStyle.cs" />
     <Compile Include="Configuration.cs" />
@@ -454,7 +456,6 @@
       <Name>Xamarin.Forms.Platform</Name>
     </ProjectReference>
   </ItemGroup>
-  <ItemGroup />
   <PropertyGroup>
     <PostBuildEvent>
     </PostBuildEvent>
diff --git a/Xamarin.Forms.Platform.Tizen/Native/Button.cs b/Xamarin.Forms.Platform.Tizen/Native/Button.cs
index 8f85da63..71ec0c10 100644
--- a/Xamarin.Forms.Platform.Tizen/Native/Button.cs
+++ b/Xamarin.Forms.Platform.Tizen/Native/Button.cs
@@ -20,7 +20,7 @@ namespace Xamarin.Forms.Platform.Tizen.Native
 		/// <summary>
 		/// The internal padding of the button, helps to determine the size.
 		/// </summary>
-		readonly ESize _internalPadding;
+		ESize _internalPadding;
 
 		/// <summary>
 		/// Optional image, if set will be drawn on the button.
@@ -201,6 +201,18 @@ namespace Xamarin.Forms.Platform.Tizen.Native
 
 			var padding = _internalPadding;
 
+			if (Style == "circle")
+			{
+				var circleTextPadding = (EdjeObject["icon_text_padding"]?.Geometry.Height).GetValueOrDefault(0);
+				var circleHeight = padding.Height + ((rawSize.Width == 0) ? 0 : circleTextPadding + formattedSize.Height);
+
+				return new ESize
+				{
+					Width = padding.Width,
+					Height = circleHeight
+				};
+			}
+
 			if (rawSize.Width > availableWidth)
 			{
 				// if the raw text width is larger than the available width, use
@@ -299,5 +311,30 @@ namespace Xamarin.Forms.Platform.Tizen.Native
 				SetPartContent("icon", _image);
 			}
 		}
+
+		public void UpdateStyle(string style)
+		{
+			if (Style != style)
+			{
+				Style = style;
+
+				if (Style == "circle")
+				{
+					var circleSize = (EdjeObject["bg"]?.Geometry.Width).GetValueOrDefault(0);
+					_internalPadding = new ESize(circleSize, circleSize);
+					_span.HorizontalTextAlignment = TextAlignment.Center;
+				}
+				else if (Style == "bottom")
+				{
+					_internalPadding = GetInternalPadding();
+					_span.HorizontalTextAlignment = TextAlignment.Auto;
+				}
+				else
+				{
+					_span.HorizontalTextAlignment = TextAlignment.Auto;
+				}
+				ApplyTextAndStyle();
+			}
+		}
 	}
 }
diff --git a/Xamarin.Forms.Platform.Tizen/Renderers/ButtonRenderer.cs b/Xamarin.Forms.Platform.Tizen/Renderers/ButtonRenderer.cs
index a34df549..8af7bb69 100644
--- a/Xamarin.Forms.Platform.Tizen/Renderers/ButtonRenderer.cs
+++ b/Xamarin.Forms.Platform.Tizen/Renderers/ButtonRenderer.cs
@@ -1,5 +1,8 @@
 using System;
+using System.ComponentModel;
 using EColor = ElmSharp.Color;
+using Xamarin.Forms.PlatformConfiguration.TizenSpecific;
+using Specific = Xamarin.Forms.PlatformConfiguration.TizenSpecific.Button;
 
 namespace Xamarin.Forms.Platform.Tizen
 {
@@ -38,12 +41,23 @@ namespace Xamarin.Forms.Platform.Tizen
 
 			if (e.NewElement != null)
 			{
+				UpdateStyle();
 				Control.Clicked += ButtonClickedHandler;
 			}
 
 			base.OnElementChanged(e);
 		}
 
+		protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
+		{
+			base.OnElementPropertyChanged(sender, e);
+
+			if (e.PropertyName == Specific.ButtonStyleProperty.PropertyName)
+			{
+				UpdateStyle();
+			}
+		}
+
 		protected override Size MinimumSize()
 		{
 			return new Size(Control.MinimumWidth, Control.MinimumHeight);
@@ -84,6 +98,26 @@ namespace Xamarin.Forms.Platform.Tizen
 			}
 		}
 
+		void UpdateStyle()
+		{
+			string style;
+			switch (Specific.GetButtonStyle(Element))
+			{
+				case ButtonStyle.Circle:
+					style = "circle";
+					break;
+				case ButtonStyle.Bottom:
+					style = "bottom";
+					break;
+				default:
+					style = "default";
+					break;
+			}
+
+			Control.UpdateStyle(style);
+			((IVisualElementController)Element).NativeSizeChanged();
+		}
+
 		void UpdateBorder()
 		{
 			/* The simpler way is to create some specialized theme for button in