using System;
using Android.Content;
using Android.Graphics;
using Android.Graphics.Drawables;
using Android.Util;
using Android.Views;

namespace Shared
{
	/// <summary>
	/// 色板
	/// </summary>
	public class ColorPicker : View
	{
		MyColorPickerView myColorPickerView {
            get {
                return AndroidView as MyColorPickerView;
            }
            set {
                AndroidView = value;
            }
        }

		/// <summary>
		/// Initializes a new instance of the <see cref="Shared.Button"/> class.
		/// </summary>
		public ColorPicker()
		{
			myColorPickerView = new MyColorPickerView(Application.Activity,this);
		}


		string colorImagePath;
		/// <summary>
		/// 色板图
		/// </summary>
		/// <value>The color image path.</value>
		public string ColorImagePath {
            get {
                return colorImagePath;
            }
            set {
                colorImagePath = value;
                Background (colorImagePath);
            }
        }

		/// <summary>
		/// 颜色变化
		/// </summary>
		public event EventHandler<byte[]> ColorChaged;

		public class MyColorPickerView : Android.Views.View
		{
			Bitmap bitmapTemp;

			View _view;
			public MyColorPickerView(Context context, View view)
				: base(context)
			{
				_view = view;
			}

			public override Android.Graphics.Drawables.Drawable Background
			{
				get
				{
					return base.Background;
				}
				set
				{
					base.Background = value;

					bitmapTemp = drawableToBitmap(value);
				}
			}

			static Bitmap drawableToBitmap(Drawable drawable)
			{
				if (drawable == null)
				{
					return null;
				}
				var bitmap = Bitmap.CreateBitmap(drawable.IntrinsicWidth,drawable.IntrinsicHeight,Bitmap.Config.Rgb565);

				Canvas canvas = new Canvas(bitmap);
				drawable.SetBounds(0, 0, drawable.IntrinsicWidth, drawable.IntrinsicHeight);
				drawable.Draw(canvas);
				return bitmap;
			}
			/// <summary>
			/// 重写点击事件
			/// </summary>
			/// <returns><c>true</c>, if touch event was oned, <c>false</c> otherwise.</returns>
			/// <param name="e">E.</param>
			public override bool OnTouchEvent(MotionEvent e)
			{
				if (_view != null && _view.Enable)
				{
					_view.TouchEvent( e);
				}
				if (bitmapTemp != null && (_view as ColorPicker).ColorChaged != null)
				{
					var color = bitmapTemp.GetPixel((int)(e.GetX() * bitmapTemp.Width / Width), (int)(e.GetY() * bitmapTemp.Height / Height));
					(_view as ColorPicker).ColorChaged(_view, new byte[] { (byte)((color >> 16) & 0xFF), (byte)((color >> 8) & 0xFF), (byte)(color & 0xFF) });
				}
				return base.OnTouchEvent(e);
			}
		}
	}
}