Update color picker hue slider when the color changes.

OpenRA.Mods.Common/Widgets/Logic/ColorPickerLogic.cs

@@ -60,9 +60,10 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 					var hue = (byte)Game.CosmeticRandom.Next(255);
 					var sat = (byte)Game.CosmeticRandom.Next(70, 255);
 					var lum = (byte)Game.CosmeticRandom.Next(70, 255);
+					var color = Color.FromAhsl(hue, sat, lum);
 
-					mixer.Set(Color.FromAhsl(hue, sat, lum));
-					hueSlider.Value = hue / 255f;
+					mixer.Set(color);
+					hueSlider.Value = HueFromColor(color);
 				};
 			}
 
@@ -70,8 +71,7 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 			var validator = modData.Manifest.Get<ColorValidator>();
 			mixer.SetPaletteRange(validator.HsvSaturationRange[0], validator.HsvSaturationRange[1], validator.HsvValueRange[0], validator.HsvValueRange[1]);
 			mixer.Set(initialColor);
-
-			hueSlider.Value = initialColor.GetHue() / 360f;
+			hueSlider.Value = HueFromColor(initialColor);
 			onChange(mixer.Color);
 
 			// Setup tab controls
@@ -126,6 +126,7 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 					newSwatch.OnMouseUp = m =>
 					{
 						mixer.Set(color);
+						hueSlider.Value = HueFromColor(color);
 						onChange(color);
 					};
 
@@ -148,6 +149,7 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 					{
 						var color = Game.Settings.Player.CustomColors[colorIndex];
 						mixer.Set(color);
+						hueSlider.Value = HueFromColor(color);
 						onChange(color);
 					};
 
@@ -179,6 +181,14 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 			}
 		}
 
+		static float HueFromColor(Color c)
+		{
+			float h, s, v;
+			int a;
+			c.ToAhsv(out a, out h, out s, out v);
+			return h;
+		}
+
 		public static void ShowColorDropDown(DropDownButtonWidget color, ColorPreviewManagerWidget preview, World world)
 		{
 			Action onExit = () =>