Support to change color on Slider for tizen backend (#2072)

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

@@ -2,11 +2,16 @@ using System;
 using System.ComponentModel;
 using ESlider = ElmSharp.Slider;
 using ESize = ElmSharp.Size;
+using EColor = ElmSharp.Color;
 
 namespace Xamarin.Forms.Platform.Tizen
 {
 	public class SliderRenderer : ViewRenderer<Slider, ESlider>
 	{
+		EColor _defaultMinColor;
+		EColor _defaultMaxColor;
+		EColor _defaultThumbColor;
+
 		protected override void OnElementChanged(ElementChangedEventArgs<Slider> e)
 		{
 			if (Control == null)
@@ -16,10 +21,14 @@ namespace Xamarin.Forms.Platform.Tizen
 					PropagateEvents = false,
 				});
 				Control.ValueChanged += OnValueChanged;
+				_defaultMinColor = Control.GetPartColor("bar");
+				_defaultMaxColor = Control.GetPartColor("bg");
+				_defaultThumbColor = Control.GetPartColor("handler");
 			}
 			UpdateMinimum();
 			UpdateMaximum();
 			UpdateValue();
+			UpdateSliderColors();
 			base.OnElementChanged(e);
 		}
 
@@ -37,6 +46,18 @@ namespace Xamarin.Forms.Platform.Tizen
 			{
 				UpdateValue();
 			}
+			else if (e.PropertyName == Slider.MinimumTrackColorProperty.PropertyName)
+			{
+				UpdateMinimumTrackColor();
+			}
+			else if (e.PropertyName == Slider.MaximumTrackColorProperty.PropertyName)
+			{
+				UpdateMaximumTrackColor();
+			}
+			else if (e.PropertyName == Slider.ThumbColorProperty.PropertyName)
+			{
+				UpdateThumbColor();
+			}
 			base.OnElementPropertyChanged(sender, e);
 		}
 
@@ -76,5 +97,32 @@ namespace Xamarin.Forms.Platform.Tizen
 		{
 			Control.Maximum = Element.Maximum;
 		}
+
+		protected void UpdateMinimumTrackColor()
+		{
+			var color = Element.MinimumTrackColor.IsDefault ? _defaultMinColor : Element.MinimumTrackColor.ToNative();
+			Control.SetPartColor("bar", color);
+			Control.SetPartColor("bar_pressed", color);
+		}
+
+		protected void UpdateMaximumTrackColor()
+		{
+			Control.SetPartColor("bg", Element.MaximumTrackColor.IsDefault ? _defaultMaxColor : Element.MaximumTrackColor.ToNative());
+		}
+
+		protected void UpdateThumbColor()
+		{
+			var color = Element.ThumbColor.IsDefault ? _defaultThumbColor : Element.ThumbColor.ToNative();
+			Control.SetPartColor("handler", color);
+			Control.SetPartColor("handler_pressed", color);
+		}
+
+		protected void UpdateSliderColors()
+		{
+			// Changing slider color is only available on mobile profile. Otherwise ignored.
+			UpdateMinimumTrackColor();
+			UpdateMaximum();
+			UpdateThumbColor();
+		}
 	}
 }