#region Copyright & License Information
/*
 * Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
 * This file is part of OpenRA.
 * 
 *  OpenRA is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 * 
 *  OpenRA is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with OpenRA.  If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System.Drawing;
using System;

namespace OpenRA.Widgets
{
	class ButtonWidget : Widget
	{
		public string Text = "";
		public bool Depressed = false;
		public int VisualHeight = 1;
		public Func<string> GetText;
		
		public ButtonWidget()
			: base()
		{
			GetText = () => { return Text; };
		}
		
		public ButtonWidget(ButtonWidget widget)
			:base(widget)
		{
			Text = widget.Text;
			Depressed = widget.Depressed;
			VisualHeight = widget.VisualHeight;
			GetText = widget.GetText;
		}
		
		public override bool HandleInput(MouseInput mi)
		{
			if (Chrome.selectedWidget == this)
				Depressed = (GetEventBounds().Contains(mi.Location.X,mi.Location.Y)) ? true : false;
			
			// Relinquish focus
			if (Chrome.selectedWidget == this && mi.Event == MouseInputEvent.Up)
			{
				Chrome.selectedWidget = null;
				Depressed = false;
			}
			
			// Are we able to handle this event?
			if (!Visible || !GetEventBounds().Contains(mi.Location.X,mi.Location.Y))
				return base.HandleInput(mi);
			
			
			if (base.HandleInput(mi))
				return true;
			
			// Give button focus only while the mouse is down
			// This is a bit of a hack: it will become cleaner soonish
			// It will also steal events from any potential children
			// We also want to play a click sound
			if (mi.Event == MouseInputEvent.Down)
			{
				Chrome.selectedWidget = this;
				Depressed = true;
				return true;
			}
			
			return false;
		}

		public override void Draw(World world)
		{
			if (!IsVisible())
			{
				base.Draw(world);
				return;
			}
			var pos = DrawPosition();

			var stateOffset = (Depressed) ? new int2(VisualHeight, VisualHeight) : new int2(0, 0);
			WidgetUtils.DrawPanel(Depressed ? "dialog3" : "dialog2", new Rectangle(pos.X, pos.Y, Bounds.Width, Bounds.Height ) );
			
			var text = GetText();
			Game.chrome.renderer.BoldFont.DrawText(text,
				new int2( pos.X + Bounds.Width / 2, pos.Y + Bounds.Height / 2)
					- new int2(Game.chrome.renderer.BoldFont.Measure(text).X / 2,
				Game.chrome.renderer.BoldFont.Measure(text).Y / 2) + stateOffset, Color.White);

			base.Draw(world);
		}
		
		public override Widget Clone()
		{	
			return new ButtonWidget(this);
		}
			
	}
}