C#动态创建两个按钮,btn2复制btn1的Click事件,匿名委托
现在有一个按钮btn1,要动态创建出一个btn2,需要btn2点击时调用btn1的点击。
在delphi中这种操作很简单:btn2.onClick:=btn1.onClick,因为onClick就是个属性,和name、width、height一样。
但是c#不能直接访问,这就麻烦了,
匿名委托,例子:
- //循环把所有菜单条目加到左侧
- Image img=null, imgDefaultDa = null, imgDefaultXiao = Image.FromFile(s + "菜单小项.png");
- foreach (ToolStripMenuItem mnu in mnu_Main.Items)
- { //循环遍历所有节点
- IconPanel m = new IconPanel();
- bar.AddBand(mnu.Text, m);
- //下级
- foreach (object o in mnu.DropDownItems)
- {
- ToolStripMenuItem mnuSub = null;
- if (o is ToolStripSeparator)
- {}
- else if (o is ToolStripMenuItem)
- {
- mnuSub = o as ToolStripMenuItem;
- img = mnuSub.Image;
- if (img == null) img = imgDefaultXiao;
- //Delegate[] ev = gsClass.getComponentEventDelegates(mnuSub, "Click", "EventHandler");
- //新建小项,难点是把这个菜单的click点击赋值给他
- PanelIcon btn = m.AddIcon(mnuSub.Text, img, delegate(object sender, EventArgs e) { mnuSub.PerformClick(); });
- }
- }
- }
参考一下:http://www.jb51.net/article/18150.htm
顺路带上c#的outLookBar、xp风格的菜单:
代码如下:
- using System;
- using System.Drawing;
- using System.Windows.Forms;
- namespace iPublic
- {
- /// <summary>
- /// outLook、 xp风格的菜单条,左侧,网上下来修改的,作者不知道是谁
- /// i'm 力生智能周承昊。20161226
- /// </summary>
- public class OutlookBar : Panel
- {
- private int buttonHeight;
- private int selectedBand;
- private int selectedBandHeight;
- public int 顶部位置偏移 = ; //zch,20161226
- public int 底部位置偏移 = ;
- public int ButtonHeight
- {
- get
- {
- return buttonHeight;
- }
- set
- {
- buttonHeight = value;
- // do recalc layout for entire bar
- }
- }
- public int SelectedBand
- {
- get
- {
- return selectedBand;
- }
- set
- {
- SelectBand(value);
- }
- }
- public OutlookBar()
- {
- buttonHeight = ;
- selectedBand = ;
- selectedBandHeight = ;
- }
- public void Initialize()
- {
- // parent must exist!
- Parent.SizeChanged += new EventHandler(SizeChangedEvent);
- }
- public void AddBand(string caption, ContentPanel content)
- {
- content.outlookBar = this;
- int index = Controls.Count;
- BandTagInfo bti = new BandTagInfo(this, index);
- BandPanel bandPanel = new BandPanel(caption, content, bti);
- Controls.Add(bandPanel);
- UpdateBarInfo();
- RecalcLayout(bandPanel, index);
- }
- public void SelectBand(int index)
- {
- selectedBand = index;
- RedrawBands();
- }
- private void RedrawBands()
- {
- for (int i = ; i < Controls.Count; i++)
- {
- BandPanel bp = Controls[i] as BandPanel;
- RecalcLayout(bp, i);
- }
- }
- private void UpdateBarInfo()
- {
- selectedBandHeight = ClientRectangle.Height - (Controls.Count * buttonHeight);
- }
- private void RecalcLayout(BandPanel bandPanel, int index)
- {
- int vPos = (index <= selectedBand) ? buttonHeight * index : buttonHeight * index + selectedBandHeight;
- int height = selectedBand == index ? selectedBandHeight + buttonHeight : buttonHeight;
- // the band dimensions
- bandPanel.Location = new Point(, vPos);
- bandPanel.Size = new Size(ClientRectangle.Width, height);
- // the contained button dimensions
- bandPanel.Controls[].Location = new Point(, );
- bandPanel.Controls[].Size = new Size(ClientRectangle.Width, buttonHeight);
- // the contained content panel dimensions
- bandPanel.Controls[].Location = new Point(, buttonHeight);
- bandPanel.Controls[].Size = new Size(ClientRectangle.Width - , height - );
- }
- private void SizeChangedEvent(object sender, EventArgs e)
- {
- Size = new Size(Size.Width, ((Control)sender).ClientRectangle.Size.Height - 顶部位置偏移 - 底部位置偏移);
- UpdateBarInfo();
- RedrawBands();
- }
- }
- internal class BandPanel : Panel
- {
- public BandPanel(string caption, ContentPanel content, BandTagInfo bti)
- {
- BandButton bandButton = new BandButton(caption, bti);
- Controls.Add(bandButton);
- Controls.Add(content);
- }
- }
- internal class BandTagInfo
- {
- public OutlookBar outlookBar;
- public int index;
- public BandTagInfo(OutlookBar ob, int index)
- {
- outlookBar = ob;
- this.index = index;
- }
- }
- internal class BandButton : Button
- {
- private BandTagInfo bti;
- public BandButton(string caption, BandTagInfo bti)
- {
- Text = caption;
- FlatStyle = FlatStyle.Standard;
- Visible = true;
- this.bti = bti;
- Click += new EventHandler(SelectBand);
- }
- private void SelectBand(object sender, EventArgs e)
- {
- bti.outlookBar.SelectBand(bti.index);
- }
- }
- public abstract class ContentPanel : Panel
- {
- public OutlookBar outlookBar;
- public ContentPanel()
- {
- // initial state
- Visible = true;
- }
- }
- /// <summary>
- /// 主菜单项
- /// </summary>
- public class IconPanel : ContentPanel
- {
- protected int iconSpacing;
- protected int margin;
- public int IconSpacing
- {
- get
- {
- return iconSpacing;
- }
- }
- public int Margin
- {
- get
- {
- return margin;
- }
- }
- public IconPanel()
- {
- margin = ;
- iconSpacing = + + ; // icon height + text height + margin
- BackColor = Color.LightBlue;
- AutoScroll = true;
- }
- public PanelIcon AddIcon(string caption, Image image, EventHandler onClickEvent)
- { //添加小项按钮
- int index = Controls.Count / ; // two entries per icon
- PanelIcon result = new PanelIcon(this, image, index, onClickEvent);
- Controls.Add(result);
- Size sz = (image == null ? new Size(, ) : image.Size);
- //
- Label label = new Label();
- label.Text = caption;
- label.Visible = true;
- label.Location = new Point(, margin + sz.Height + index * iconSpacing);
- label.Size = new Size(Size.Width, );
- label.TextAlign = ContentAlignment.TopCenter;
- if (onClickEvent != null) label.Click += onClickEvent;
- label.Tag = result;
- Controls.Add(label);
- //
- return result;
- }
- }
- public class PanelIcon : PictureBox
- {
- public int index;
- public IconPanel iconPanel;
- private Color bckgColor;
- private bool mouseEnter;
- public int Index { get { return index; } }
- public PanelIcon(IconPanel parent, Image image, int index, EventHandler onClickEvent)
- { //新建按钮项
- this.index = index;
- this.iconPanel = parent;
- Image = image;
- Visible = true;
- Size sz = (image == null ? new Size(, ) : image.Size);
- Location = new Point(iconPanel.outlookBar.Size.Width / - sz.Width / ,
- iconPanel.Margin + index * iconPanel.IconSpacing);
- Size = sz;
- if (onClickEvent != null) Click += onClickEvent;
- Tag = this;
- MouseEnter += new EventHandler(OnMouseEnter);
- MouseLeave += new EventHandler(OnMouseLeave);
- MouseMove += new MouseEventHandler(OnMouseMove);
- bckgColor = iconPanel.BackColor;
- mouseEnter = false;
- }
- private void OnMouseMove(object sender, MouseEventArgs args)
- { //鼠标移动
- if ((args.X < Size.Width - ) &&
- (args.Y < Size.Width - ) &&
- (!mouseEnter))
- {
- BackColor = Color.LightCyan;
- BorderStyle = BorderStyle.FixedSingle;
- Location = Location - new Size(, );
- mouseEnter = true;
- }
- }
- private void OnMouseEnter(object sender, EventArgs e)
- {
- }
- private void OnMouseLeave(object sender, EventArgs e)
- { //鼠标离开
- if (!mouseEnter) return;
- //
- BackColor = bckgColor;
- BorderStyle = BorderStyle.None;
- Location = Location + new Size(, );
- mouseEnter = false;
- }
- }
- #region //调用的例子代码
- public class 调用的例子代码
- {
- private void loadLeftMenuBar(Form form)
- { //加载左侧菜单树
- //mnu_Main.Visible = false;
- object o = form.Controls.Find("mnu_Main", true), o2 = form.Controls.Find("sts_Main", true);
- if (o2 == null) o2 = form.Controls.Find("stb_Main", true);
- MenuStrip mnu_Main = (o == null ? null : o as MenuStrip);
- StatusStrip sts_Main = (o2 == null ? null : o2 as StatusStrip);
- string s = _iDefine.getRootPath() + "\\images\\";
- //初始化
- OutlookBar outlookBar = new OutlookBar();
- if (mnu_Main != null) outlookBar.顶部位置偏移 = (!mnu_Main.Visible ? : * (mnu_Main.Height + ));
- if (sts_Main != null) outlookBar.底部位置偏移 = sts_Main.Height + ;
- outlookBar.Location = new Point(, outlookBar.顶部位置偏移);
- outlookBar.Size = new Size(, form.ClientSize.Height - outlookBar.顶部位置偏移 - outlookBar.底部位置偏移);
- outlookBar.BorderStyle = BorderStyle.FixedSingle;
- form.Controls.Add(outlookBar);
- outlookBar.Initialize();
- //大块
- IconPanel iconPanel1 = new IconPanel();
- IconPanel iconPanel2 = new IconPanel();
- IconPanel iconPanel3 = new IconPanel();
- outlookBar.AddBand("Outlook Shortcuts", iconPanel1);
- outlookBar.AddBand("我的桌面", iconPanel2);
- outlookBar.AddBand("Other Shortcuts", iconPanel3);
- //小项
- iconPanel1.AddIcon("Outlook Today", Image.FromFile(s + "img1.ico"), new EventHandler(PanelEvent));
- iconPanel1.AddIcon("Calendar", Image.FromFile(s + "img2.ico"), new EventHandler(PanelEvent));
- iconPanel1.AddIcon("Contacts", Image.FromFile(s + "img3.ico"), new EventHandler(PanelEvent));
- iconPanel1.AddIcon("Tasks", Image.FromFile(s + "img4.ico"), new EventHandler(PanelEvent));
- iconPanel2.AddIcon("ABC", Image.FromFile(s + "img4.ico"), new EventHandler(PanelEvent));
- iconPanel3.AddIcon("DEFD", Image.FromFile(s + "img4.ico"), new EventHandler(PanelEvent));
- //选中第一项
- outlookBar.SelectBand();
- }
- public void PanelEvent(object sender, EventArgs e)
- {
- Control ctrl = (Control)sender;
- PanelIcon panelIcon = ctrl.Tag as PanelIcon;
- MessageBox.Show("#" + panelIcon.Index.ToString(), "Panel Event");
- }
- }
- #endregion
- }
Gs_Class中获取所有Delegate的代码:
- #region//取一个控件的事件托管清单:getComponentEventDelegates
- /// <summary>
- /// 取一个控件的事件托管清单,例如想判断一个GridView是否定义了PageIndexChanging事件
- /// 从CSDN搜来的:http://blog.csdn.net/zxkid/archive/2006/12/15/1444396.aspx
- /// </summary>
- /// <param name="component">组件对象实例</param>
- /// <param name="EventName">事件的名称,如:Click</param>
- /// <param name="EventHandlerTypeName">事件委托类型,如"ItemClickEventHander"</param>
- /// <returns></returns>
- public static Delegate[] getComponentEventDelegates(object component, string EventName, string EventHandlerTypeName)
- {
- //取控件的类型、属性列表、事件托管列表、头字段列表
- Type componentType = component.GetType();
- PropertyInfo eventsPropertyInfo = componentType.GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic);
- EventHandlerList eventHanlderList = eventsPropertyInfo.GetValue(component, null) as EventHandlerList;
- FieldInfo HeadFieldInfo = eventHanlderList.GetType().GetField("head", BindingFlags.Instance | BindingFlags.NonPublic);
- object HeadObject = HeadFieldInfo.GetValue(eventHanlderList);
- //
- do
- {
- FieldInfo[] fieldInfoList = componentType.GetFields(BindingFlags.Static | BindingFlags.Instance | BindingFlags.NonPublic);
- foreach (FieldInfo fieldInfo in fieldInfoList)
- {
- object fieldValue = fieldInfo.GetValue(component);
- if (fieldValue != null)
- {
- Type fieldType = fieldValue.GetType();
- if (fieldType.Name == EventHandlerTypeName && (fieldValue as Delegate) != null)
- {
- return (fieldValue as Delegate).GetInvocationList();
- }
- else if (fieldType.Name == typeof(Object).Name)
- {
- if (fieldInfo.Name.IndexOf(EventName, StringComparison.OrdinalIgnoreCase) > -)
- {
- if (HeadObject != null)
- {
- Delegate delegateObject = eventHanlderList[fieldValue];
- if (delegateObject != null)
- return delegateObject.GetInvocationList();
- }
- }
- }
- }
- }
- componentType = componentType.BaseType;
- }
- while (componentType != null); //循环结束
- //
- if (HeadObject == null) return null; //没有
- object ListEntry = HeadObject;
- Type ListEntryType = ListEntry.GetType();
- FieldInfo handlerFieldInfo = ListEntryType.GetField("handler", BindingFlags.Instance | BindingFlags.NonPublic);
- FieldInfo keyFieldInfo = ListEntryType.GetField("key", BindingFlags.Instance | BindingFlags.NonPublic);
- FieldInfo nextFieldInfo = ListEntryType.GetField("next", BindingFlags.Instance | BindingFlags.NonPublic);
- while (ListEntry != null)
- {
- Delegate handler = handlerFieldInfo.GetValue(ListEntry) as Delegate;
- object key = keyFieldInfo.GetValue(ListEntry);
- ListEntry = nextFieldInfo.GetValue(ListEntry);
- if (handler != null && handler.GetType().Name == EventHandlerTypeName)
- return handler.GetInvocationList();
- }
- return null;
- }
- #endregion
转载请注明:海宏软件原创。
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