context: #region Copyright & License Information
  /*
   * Copyright 2007-2015 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 System.Drawing;
  using OpenRA.Widgets;
  
  namespace OpenRA.Mods.Common.Widgets
  {
  	public class ButtonWidget : Widget
  	{
  		public readonly string TooltipContainer;
  		public readonly string TooltipTemplate = "BUTTON_TOOLTIP";
  		public Func<ButtonWidget, Hotkey> GetKey = _ => Hotkey.Invalid;
  
  		public Hotkey Key
  		{
  			get { return GetKey(this); }
  			set { GetKey = _ => value; }
  		}
  
  		[Translate] public string Text = "";
  		public string Background = "button";
  		public bool Depressed = false;
  		public int VisualHeight = ChromeMetrics.Get<int>("ButtonDepth");
  		public int BaseLine = 0;
  		public string Font = ChromeMetrics.Get<string>("ButtonFont");
  		public Color TextColor = ChromeMetrics.Get<Color>("ButtonTextColor");
  		public Color TextColorDisabled = ChromeMetrics.Get<Color>("ButtonTextColorDisabled");
  		public bool Contrast = ChromeMetrics.Get<bool>("ButtonTextContrast");
  		public Color ContrastColor = ChromeMetrics.Get<Color>("ButtonTextContrastColor");
  		public bool Disabled = false;
  		public bool Highlighted = false;
  		public Func<string> GetText;
  		public Func<Color> GetColor;
  		public Func<Color> GetColorDisabled;
  		public Func<Color> GetContrastColor;
  		public Func<bool> IsDisabled;
  		public Func<bool> IsHighlighted;
  		public Action<MouseInput> OnMouseDown = _ => { };
  		public Action<MouseInput> OnMouseUp = _ => { };
  
  		Lazy<TooltipContainerWidget> tooltipContainer;
  		[Translate] public string TooltipText;
  		public Func<string> GetTooltipText;
  
  		// Equivalent to OnMouseUp, but without an input arg
  		public Action OnClick = () => { };
  		public Action OnDoubleClick = () => { };
  		public Action<KeyInput> OnKeyPress = _ => { };
  
  		protected readonly Ruleset ModRules;
  
  		[ObjectCreator.UseCtor]
  		public ButtonWidget(Ruleset modRules)
  		{
  			ModRules = modRules;
  
  			GetText = () => Text;
  			GetColor = () => TextColor;
  			GetColorDisabled = () => TextColorDisabled;
  			GetContrastColor = () => ContrastColor;
  			OnMouseUp = _ => OnClick();
  			OnKeyPress = _ => OnClick();
  			IsDisabled = () => Disabled;
  			IsHighlighted = () => Highlighted;
  			GetTooltipText = () => TooltipText;
  			tooltipContainer = Exts.Lazy(() =>
  				Ui.Root.Get<TooltipContainerWidget>(TooltipContainer));
  		}
  
  		protected ButtonWidget(ButtonWidget other)
  			: base(other)
  		{
  			ModRules = other.ModRules;
  
  			Text = other.Text;
  			Font = other.Font;
  			BaseLine = other.BaseLine;
  			TextColor = other.TextColor;
  			TextColorDisabled = other.TextColorDisabled;
  			Contrast = other.Contrast;
  			ContrastColor = other.ContrastColor;
  			Depressed = other.Depressed;
  			Background = other.Background;
  			VisualHeight = other.VisualHeight;
  			GetText = other.GetText;
  			GetColor = other.GetColor;
  			GetColorDisabled = other.GetColorDisabled;
  			GetContrastColor = other.GetContrastColor;
  			OnMouseDown = other.OnMouseDown;
  			Disabled = other.Disabled;
  			IsDisabled = other.IsDisabled;
  			Highlighted = other.Highlighted;
  			IsHighlighted = other.IsHighlighted;
  
  			OnMouseUp = mi => OnClick();
  			OnKeyPress = _ => OnClick();
  
  			TooltipTemplate = other.TooltipTemplate;
  			TooltipText = other.TooltipText;
  			GetTooltipText = other.GetTooltipText;
  			TooltipContainer = other.TooltipContainer;
  			tooltipContainer = Exts.Lazy(() =>
  				Ui.Root.Get<TooltipContainerWidget>(TooltipContainer));
  		}
  
  		public override bool YieldMouseFocus(MouseInput mi)
  		{
  			Depressed = false;
  			return base.YieldMouseFocus(mi);
  		}
  
  		public override bool HandleKeyPress(KeyInput e)
  		{
  			if (Hotkey.FromKeyInput(e) != Key || e.Event != KeyInputEvent.Down)
  				return false;
  
  			if (!IsDisabled())
  			{
  				OnKeyPress(e);
  				Sound.PlayNotification(ModRules, null, "Sounds", "ClickSound", null);
  			}
  			else
  				Sound.PlayNotification(ModRules, null, "Sounds", "ClickDisabledSound", null);
  
  			return true;
  		}
  
  		public override bool HandleMouseInput(MouseInput mi)
  		{
  			if (mi.Button != MouseButton.Left)
  				return false;
  
  			if (mi.Event == MouseInputEvent.Down && !TakeMouseFocus(mi))
  				return false;
  
  			var disabled = IsDisabled();
  			if (HasMouseFocus && mi.Event == MouseInputEvent.Up && mi.MultiTapCount == 2)
  			{
  				if (!disabled)
  				{
  					OnDoubleClick();
  					return YieldMouseFocus(mi);
  				}
  			}
  			else if (HasMouseFocus && mi.Event == MouseInputEvent.Up)
  			{
  				// Only fire the onMouseUp event if we successfully lost focus, and were pressed
  				if (Depressed && !disabled)
  					OnMouseUp(mi);
  
  				return YieldMouseFocus(mi);
  			}
  
  			if (mi.Event == MouseInputEvent.Down)
  			{
  				// OnMouseDown returns false if the button shouldn't be pressed
  				if (!disabled)
  				{
  					OnMouseDown(mi);
  					Depressed = true;
  					Sound.PlayNotification(ModRules, null, "Sounds", "ClickSound", null);
  				}
  				else
  				{
  					YieldMouseFocus(mi);
  					Sound.PlayNotification(ModRules, null, "Sounds", "ClickDisabledSound", null);
  				}
  			}
  			else if (mi.Event == MouseInputEvent.Move && HasMouseFocus)
  				Depressed = RenderBounds.Contains(mi.Location);
  
  			return Depressed;
  		}
  
  		public override void MouseEntered()
  		{
  			if (TooltipContainer == null || GetTooltipText() == null)
  				return;
  
  			tooltipContainer.Value.SetTooltip(TooltipTemplate,
  				new WidgetArgs { { "button", this } });
  		}
  
  		public override void MouseExited()
  		{
  			if (TooltipContainer == null || !tooltipContainer.IsValueCreated)
  				return;
  
  			tooltipContainer.Value.RemoveTooltip();
  		}
  
  		public override int2 ChildOrigin
  		{
  			get
  			{
  				return RenderOrigin +
  					(Depressed ? new int2(VisualHeight, VisualHeight) : new int2(0, 0));
  			}
  		}
  
  		public override void Draw()
  		{
  			var rb = RenderBounds;
  			var disabled = IsDisabled();
  			var highlighted = IsHighlighted();
  
  			var font = Game.Renderer.Fonts[Font];
  			var text = GetText();
  			var color = GetColor();
  			var colordisabled = GetColorDisabled();
  			var contrast = GetContrastColor();
  			var s = font.Measure(text);
  			var stateOffset = Depressed ? new int2(VisualHeight, VisualHeight) : new int2(0, 0);
  			var position = new int2(rb.X + (UsableWidth - s.X) / 2, rb.Y - BaseLine + (Bounds.Height - s.Y) / 2);
  
  			DrawBackground(rb, disabled, Depressed, Ui.MouseOverWidget == this, highlighted);
  			if (Contrast)
  				font.DrawTextWithContrast(text, position + stateOffset,
  					disabled ? colordisabled : color, contrast, 2);
  			else
  				font.DrawText(text, position + stateOffset,
  					disabled ? colordisabled : color);
  		}
  
  		public override Widget Clone() { return new ButtonWidget(this); }
  		public virtual int UsableWidth { get { return Bounds.Width; } }
  
  		public virtual void DrawBackground(Rectangle rect, bool disabled, bool pressed, bool hover, bool highlighted)
  		{
  			DrawBackground(Background, rect, disabled, pressed, hover, highlighted);
  		}
  
  		public static void DrawBackground(string baseName, Rectangle rect, bool disabled, bool pressed, bool hover, bool highlighted)
  		{
  			var variant = highlighted ? "-highlighted" : "";
  			var state = disabled ? "-disabled" :
  						pressed ? "-pressed" :
  
gt: 						hover ? "-hover" :