using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;

namespace ControlLib.inh
{

    /// <summary>
    /// 图片按钮
    /// </summary>
    public partial class ImageButton : PictureBox
    {

        private Image m_imgUp = null;
        private Image m_imgOver = null;
        private Image m_imgDown = null;
        private Image m_imgDisable = null;
        private Bitmap m_grayDisable = null;


        private string m_strUp = string.Empty;
        private string m_strOver = string.Empty;
        private string m_strDown = string.Empty;
        private string m_strDisable = string.Empty;

        public void Init(string strUp)
        {
            Init(strUp, string.Empty, string.Empty, string.Empty);
        }

        public void Init(string strUp, string strOver)
        {
            Init(strUp, strOver, string.Empty, string.Empty);
        }

        public void Init(string strUp, string strOver, string strDown)
        {
            Init(strUp, strOver, strDown,string.Empty);
        }

        public void Init(string strUp, string strOver, string strDown, string strDisable)
        {
            m_strUp = strUp;
            m_strOver = strOver;
            m_strDown = strDown;
            m_strDisable = strDisable;

            ChangeState(m_strUp, ref m_imgUp);
            
        }

        private void ImageButton_MouseEnter(object sender, EventArgs e)
        {
            if (m_LockStated)
                return;

            ChangeState(m_strOver, ref m_imgOver);
        }

        private void ImageButton_MouseLeave(object sender, EventArgs e)
        {
            if (m_LockStated)
                return;

            ChangeState(m_strUp, ref m_imgUp);
        }

        private void ImageButton_MouseDown(object sender, EventArgs e)
        {
            if (m_LockStated)
                return;

            ChangeState(m_strDown, ref m_imgDown);
        }

        private void ChangeState(string strSource, ref Image imgSource)
        {
            if (strSource == string.Empty)
                return;

            if (imgSource == null)
                imgSource = Image.FromFile(strSource);
            this.Image = imgSource;
            //CommonLib.PubUtil.WriteLog("***************************************************************");
        }

        protected override void Dispose(bool disposing)
        {
            if(m_imgUp!=null)
                m_imgUp.Dispose();
            if(m_imgOver!=null)
                m_imgOver.Dispose();
            if(m_imgDown!=null)
                m_imgDown.Dispose();
            if(m_imgDisable!=null)
                m_imgDisable.Dispose();
            if(m_grayDisable!=null)
                m_grayDisable.Dispose();
            
            m_imgUp = m_imgOver = m_imgDown = m_imgDisable = m_grayDisable = null;

            base.Dispose(disposing);
        }

        //是否处在锁定状态
        private bool m_LockStated = false;

        public void LockState(bool up, bool over)
        {
            LockState(up, over, false, false);
        }

        public void LockState(bool up, bool over, bool down,bool disable)
        {
            m_LockStated = true;
            if(up)
                ChangeState(m_strUp, ref m_imgUp);
            if (over)
                ChangeState(m_strOver, ref m_imgOver);
            if (down)
                ChangeState(m_strDown, ref m_imgDown);
            if (disable)
                ChangeState(m_strDisable, ref m_imgDisable);
        }

        /// <summary>
        /// 释放锁，切换到默认状态
        /// </summary>
        public void ReleaseLock()
        {
            m_LockStated = false;
            ChangeState(m_strUp, ref m_imgUp);
        }

        //public override bool Enabled无法覆盖
        private void ImageButton_EnabledChanged(object sender, EventArgs e)
        {
            if (m_LockStated)
                return;

            if (this.Enabled)
            {
                ChangeState(m_strUp, ref m_imgUp);
            }
            else
            {
                ChangeState(m_strDisable, ref m_imgDisable);
                if (m_imgDisable == null)
                {
                    if (m_grayDisable == null && m_imgUp != null)
                    {
                        m_grayDisable = new Bitmap(m_imgUp.Width, m_imgUp.Height);
                        Bitmap bitTmp = (Bitmap)m_imgUp;
                        Color pixel;

                        for (int x = 0; x < m_grayDisable.Width; x++)
                        {
                            for (int y = 0; y < m_grayDisable.Height; y++)
                            {
                                pixel = bitTmp.GetPixel(x, y);
                                int r = pixel.R;
                                int g = pixel.G;
                                int b = pixel.B;

                                int m = ((int)(0.7 * r) + (int)(0.2 * g) + (int)(0.1 * b));

                                m_grayDisable.SetPixel(x, y, Color.FromArgb(m, m, m));
                            }
                        }
                    }
                    this.Image = m_grayDisable;
                }
            }
            
        }


        public ImageButton()
        {
            //设置双缓冲
            this.SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint,true);
            this.MouseDown += new MouseEventHandler(ImageButton_MouseDown);
            this.MouseEnter += new EventHandler(ImageButton_MouseEnter);
            this.MouseLeave += new EventHandler(ImageButton_MouseLeave);
            this.EnabledChanged += new EventHandler(ImageButton_EnabledChanged);
        }

        /// <summary>
        /// 附带的参数
        /// </summary>
        private object m_Source = null;
        public object Source
        {
            get { return m_Source; }
            set { m_Source = value; }
        }

        public object[] SourceValue = null;
    }
}