unify colorpickers across ra and cnc

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

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using OpenRA.FileFormats;
+using OpenRA.Graphics;
+using OpenRA.Widgets;
+
+namespace OpenRA.Mods.RA.Widgets.Logic
+{
+	public class ColorPickerLogic
+	{
+		ColorRamp ramp;
+
+		[ObjectCreator.UseCtor]
+		public ColorPickerLogic(Widget widget, ColorRamp initialRamp, Action<ColorRamp> onChange,
+			Action<ColorRamp> onSelect, WorldRenderer worldRenderer)
+		{
+			var panel = widget.GetWidget("COLOR_CHOOSER");
+			ramp = initialRamp;
+			var hueSlider = panel.GetWidget<SliderWidget>("HUE_SLIDER");
+			var satSlider = panel.GetWidget<SliderWidget>("SAT_SLIDER");
+			var lumSlider = panel.GetWidget<SliderWidget>("LUM_SLIDER");
+
+			Action sliderChanged = () =>
+			{
+				ramp = new ColorRamp((byte)(255*hueSlider.Value),
+									 (byte)(255*satSlider.Value),
+									 (byte)(255*lumSlider.Value),
+									 10);
+				onChange(ramp);
+			};
+
+			hueSlider.OnChange += _ => sliderChanged();
+			satSlider.OnChange += _ => sliderChanged();
+			lumSlider.OnChange += _ => sliderChanged();
+
+			Action updateSliders = () =>
+			{
+				hueSlider.Value = ramp.H / 255f;
+				satSlider.Value = ramp.S / 255f;
+				lumSlider.Value = ramp.L / 255f;
+			};
+
+			panel.GetWidget<ButtonWidget>("SAVE_BUTTON").OnClick = () => onSelect(ramp);
+
+			var randomButton = panel.GetWidget<ButtonWidget>("RANDOM_BUTTON");
+			if (randomButton != null)
+				randomButton.OnClick = () =>
+				{
+					var hue = (byte)Game.CosmeticRandom.Next(255);
+					var sat = (byte)Game.CosmeticRandom.Next(255);
+					var lum = (byte)Game.CosmeticRandom.Next(51,255);
+
+					ramp = new ColorRamp(hue, sat, lum, 10);
+					updateSliders();
+					sliderChanged();
+				};
+
+			// Set the initial state
+			updateSliders();
+			onChange(ramp);
+		}
+	}
+}
+