using System;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Documents;

namespace LY.ExamineRoutedEvents

{

    public class ExamineRoutedEvents : Application

    {

        static readonly FontFamily fontfam = new FontFamily("宋体");

        const string strformat = "{0,-30},{1,-15},{2,-15},{3,-15}";

        StackPanel stackOutput;

        DateTime dtLast;

        [STAThread]

        public static void Main()

        {

            ExamineRoutedEvents app = new ExamineRoutedEvents();

            app.Run();

        }

        protected override void OnStartup(StartupEventArgs e)

        {

            base.OnStartup(e);

            Window win = new Window();

            win.Title = "Examine Routed Events";

            //建立Grid

            Grid grid = new Grid();

            win.Content = grid;

            //建立三行

            RowDefinition rowdef = new RowDefinition();

            rowdef.Height = GridLength.Auto;

            grid.RowDefinitions.Add(rowdef);

            rowdef = new RowDefinition();

            rowdef.Height = GridLength.Auto;

            grid.RowDefinitions.Add(rowdef);

            rowdef = new RowDefinition();

            rowdef.Height = new GridLength(100, GridUnitType.Star);

            grid.RowDefinitions.Add(rowdef);

            //建立button,加入到grid

            Button btn = new Button();

            btn.HorizontalAlignment = HorizontalAlignment.Center;

            btn.Padding = new Thickness(24);

            btn.Margin = new Thickness(24);

            grid.Children.Add(btn);

            //建立textblock，加入button

            TextBlock text = new TextBlock();

            text.FontSize = 24;

            text.Text = win.Title;

            btn.Content = text;

            //建立标题，显示在ScrollViewer

            TextBlock textHeadings = new TextBlock();

            textHeadings.FontFamily = fontfam;

            textHeadings.Inlines.Add(new Underline(new Run(string.Format(strformat,

                "Routed Events", "Sender", "Source", "OriginalSource"))));

            grid.Children.Add(textHeadings);

            Grid.SetRow(textHeadings, 1);

            //加入Scorllviewer

            ScrollViewer scroll = new ScrollViewer();

            grid.Children.Add(scroll);

            Grid.SetRow(scroll, 2);

            //建立Stackpanel，放入Scorllviewer

            stackOutput = new StackPanel();

            scroll.Content = stackOutput;

            //新增事件处理器

            UIElement[] els = { win, grid, btn, text };

            foreach (UIElement el in els)

            {

                // Keyboard

                el.PreviewKeyDown += AllPurposeEventHandler;

                el.PreviewKeyUp += AllPurposeEventHandler;

                el.PreviewTextInput += AllPurposeEventHandler;

                el.KeyDown += AllPurposeEventHandler;

                el.KeyUp += AllPurposeEventHandler;

                el.TextInput += AllPurposeEventHandler;

                // Mouse

                el.MouseDown += AllPurposeEventHandler;

                el.MouseUp += AllPurposeEventHandler;

                el.PreviewMouseDown += AllPurposeEventHandler;

                el.PreviewMouseUp += AllPurposeEventHandler;

                // Stylus

                el.StylusDown += AllPurposeEventHandler;

                el.StylusUp += AllPurposeEventHandler;

                el.PreviewStylusDown += AllPurposeEventHandler;

                el.PreviewStylusUp += AllPurposeEventHandler;

                //Window,Grid,Textblock类没有click事件，所以用在ButtonBase类中定义的AddHandler方法

                el.AddHandler(Button.ClickEvent,

                    new RoutedEventHandler(AllPurposeEventHandler));

            }

            win.Show();

        }

        void AllPurposeEventHandler(object sender, RoutedEventArgs e)

        {

            //如果有时间空隙，加入空格

            DateTime dtNow = DateTime.Now;

            if (dtNow - dtLast > TimeSpan.FromMilliseconds(100))

                stackOutput.Children.Add(new TextBlock(new Run()));

            dtLast = dtNow;

            //显示事件信息

            TextBlock text = new TextBlock();

            text.FontFamily = fontfam;

            text.Text = string.Format(strformat, e.RoutedEvent.Name,

                TypeWithoutNamespace(sender),

                TypeWithoutNamespace(e.Source),

                TypeWithoutNamespace(e.OriginalSource));

            stackOutput.Children.Add(text);

            (stackOutput.Parent as ScrollViewer).ScrollToBottom();

        }

        string TypeWithoutNamespace(object obj)

        {

            string[] str = obj.GetType().ToString().Split('.');

            return str[str.Length-1];

        }

    }

}

public abstract class ButtonBase : ContentControl, ICommandSource

{

    //字段 声明路由事件

    public static readonly RoutedEvent ClickEvent;

    //构造函数 在静态构造函数中注册路由事件，也可在直接申明字段同时注册路由事件

    static ButtonBase()

    {

	//第1个参数为事件名

	//第2个参数为路由策略，有三种策略：Bubble（冒泡式），Tunnel（隧道式），Direct（直达式）

	//第3个参数为用于指定事件处理器的类型,该类型必须为委托类型，并且不能为 null

	//第4个参数为路由事件所在的类名

        ClickEvent = EventManager.RegisterRoutedEvent("Click", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(ButtonBase));

    }

    //事件 将路由事件包装成CLR事件

    public event RoutedEventHandler Click

    {

        add { base.AddHandler(ClickEvent, value); }

        remove { base.RemoveHandler(ClickEvent, value); }

    }

    //方法 创建激发事件的方法

    protected virtual void OnClick()

    {

        RoutedEventArgs e = new RoutedEventArgs(ClickEvent, this);

        base.RaiseEvent(e);

    }

}