#region Copyright & License Information
/*
 * Copyright 2007-2020 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, either version 3 of
 * the License, or (at your option) any later version. For more
 * information, see COPYING.
 */
#endregion

using OpenRA.Primitives;
using OpenRA.Widgets;

namespace OpenRA.Mods.Common.Widgets
{
	public class BackgroundWidget : Widget
	{
		public readonly bool ClickThrough = false;
		public readonly bool Draggable = false;
		public string Background = "dialog";

		public override void Draw()
		{
			WidgetUtils.DrawPanel(Background, RenderBounds);
		}

		public BackgroundWidget() { }

		bool moving;
		int2? prevMouseLocation;

		public override bool HandleMouseInput(MouseInput mi)
		{
			if (ClickThrough || !RenderBounds.Contains(mi.Location))
				return false;

			if (!Draggable || (moving && (!TakeMouseFocus(mi) || mi.Button != MouseButton.Left)))
				return true;

			if (prevMouseLocation == null)
				prevMouseLocation = mi.Location;
			var vec = mi.Location - (int2)prevMouseLocation;
			prevMouseLocation = mi.Location;
			switch (mi.Event)
			{
				case MouseInputEvent.Up:
					moving = false;
					YieldMouseFocus(mi);
					break;
				case MouseInputEvent.Down:
					moving = true;
					Bounds = new Rectangle(Bounds.X + vec.X, Bounds.Y + vec.Y, Bounds.Width, Bounds.Height);
					break;
				case MouseInputEvent.Move:
					if (moving)
						Bounds = new Rectangle(Bounds.X + vec.X, Bounds.Y + vec.Y, Bounds.Width, Bounds.Height);
					break;
			}

			return true;
		}

		protected BackgroundWidget(BackgroundWidget other)
			: base(other)
		{
			Background = other.Background;
			ClickThrough = other.ClickThrough;
			Draggable = other.Draggable;
		}

		public override Widget Clone() { return new BackgroundWidget(this); }
	}
}