wpf 用户自定义事件传参

最新推荐文章于 2025-05-23 17:06:49 发布

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最新推荐文章于 2025-05-23 17:06:49 发布

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原文链接：http://www.cnblogs.com/zsx-blog/p/8193618.html

本文介绍了一个WPF应用程序中实现图片缩放功能的方法，包括自定义事件参数传递缩放级别、事件委托定义及触发过程。通过这些技术手段，可以有效响应用户的鼠标滚轮操作以调整图片显示大小。

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//自定义传参 ，对外联系的参数
public class ImageZoomChangedEventArgs : RoutedEventArgs
    {
        /// <summary>
        /// 放大倍数，1：原始尺寸
        /// </summary>
        public int Zoom { get; set; }
        public ImageZoomChangedEventArgs(RoutedEvent routedEvent, int value) : base(routedEvent)
        {
            this.Zoom = value;
        }
    }



//用户自定义事件
        public delegate void ZoomChangedEventHandler(object sender, EventArgs e);
        public event ZoomChangedEventHandler ZoomChanged
        {
            add
            {
                this.AddHandler(ZoomChangedEvent, value);
            }

            remove
            {
                this.RemoveHandler(ZoomChangedEvent, value);
            }
        }
        public static readonly RoutedEvent ZoomChangedEvent = EventManager.RegisterRoutedEvent("ZoomChanged", RoutingStrategy.Bubble, typeof(ZoomChangedEventHandler), typeof(HZImageViewerEx));


    //触发自定义事件
     void OnPreviewMouseWheel(object sender, MouseWheelEventArgs e)
        {
        this.RaiseEvent(new ImageZoomChangedEventArgs(ZoomChangedEvent, (int)slider.Value));
       }

//外部接收的事件处理方法 
private void img_ZoomChanged(object sender, EventArgs e) 
{
    var args = (ImageZoomChangedEventArgs)e;     
         if(args.Zoom!=1) 
         {
               .... 
          }
 }