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Visual C++

MouseWheeMsg.cs：源码内容

							using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
namespace OnePhoto
{
    public delegate void MouseWheelHandler(object sender, bool isDelta);
    public class MouseWheeMsg:System.Windows.Forms.IMessageFilter
    {
        public event MouseWheelHandler MouseWheel;
        protected virtual void OnMouseWheel(bool isDelta)
        {
            if (MouseWheel != null)
                MouseWheel(this, isDelta);
        }// end viod 
        private const int WM_MOUSEWHEEL = 0x020A;
        /// <summary>
        /// 定义句柄
        /// </summary>
        private bool m_HandleType;
        /// <summary>
        /// 设置是窗体句柄 还是控件句柄
        /// </summary>
        public bool SetHandleType
        {
            set
            {
                this.m_HandleType = value;
            }
        }// end Form;
        public MouseWheeMsg()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
            this.m_HandleType = true;
        }
        /// <summary>
        /// 如果键入
        /// </summary>
        /// <param name="m"></param>
        /// <returns></returns>
        public bool PreFilterMessage(ref Message m)
        {
            switch (m.Msg)
            {
                case WM_MOUSEWHEEL:
                    if (this.m_HandleType)
                    {
                        //Type mytype = this.m_MouseEvent.GetType();
                        //this.m_MouseEvent = (System.Windows.Forms.MouseEventArgs)m.GetLParam(mytype);				
                        if (m.WParam.ToInt32() > 0)
                        {
                            OnMouseWheel(true);
                        }// end if
                        else
                        {
                            OnMouseWheel(false);
                        }// end if
                        return true;
                    }
                    break;
            }// end switch
            return false;
        }
    }
}

						