[用户交互] AUTOCAD中添加默认菜单
AutoCAD默认的菜单项中添加子菜单。当用户右击鼠标，且CAD中的对象处于未选择状态时，就会出现默认菜单。这也是个添加命令菜单的好地方。这个方法与跟以前的很相似，尽管为了获取模块初始化时的反馈，我添加了几个额外的命令来添加和移除各个菜单。
几点需要注意的：
我们并不是简单的添加一个菜单项，而是We're not just adding a single menu item, but are using a cascading menu - three menu items underneath a main application menu item.
我们再次使用了 Autodesk.AutoCAD.Internal namespace 命令空间(需要饮用 AcMgdInternal.dll )中的 PostCommandPrompt() 函数。当然，如果通过发送字符串到Execute()，就不需要它了。
代码如下:
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.Windows;
using Autodesk.AutoCAD.Internal;
using System;
namespace ContextMenuApplication
{
public class Commands : IExtensionApplication
{
public void Initialize()
{
CountMenu.Attach();
ApplicationMenu.Attach();
}
public void Terminate()
{
CountMenu.Detach();
ApplicationMenu.Detach();
}
static public void AttachContextMenus()
{
CountMenu.Attach();
ApplicationMenu.Attach();
}
static public void DetachContextMenus()
{
CountMenu.Detach();
ApplicationMenu.Detach();
}
static public void CountSelection()
{
Editor ed =
Application.DocumentManager.MdiActiveDocument.Editor;
PromptSelectionResult psr = ed.GetSelection();
if (psr.Status == PromptStatus.OK)
{
ed.WriteMessage(
"\nSelected {0} entities.",
psr.Value.Count
);
}
}
}
public class CountMenu
{
private static ContextMenuExtension cme;
public static void Attach()
{
if (cme == null)
{
cme = new ContextMenuExtension();
MenuItem mi = new MenuItem("Count");
mi.Click += new EventHandler(OnCount);
cme.MenuItems.Add(mi);
}
RXClass rxc = Entity.GetClass(typeof(Entity));
Application.AddObjectContextMenuExtension(rxc, cme);
}
public static void Detach()
{
RXClass rxc = Entity.GetClass(typeof(Entity));
Application.RemoveObjectContextMenuExtension(rxc, cme);
}
private static void OnCount(Object o, EventArgs e)
{
Document doc =
Application.DocumentManager.MdiActiveDocument;
doc.SendStringToExecute("_.COUNT ", true, false, false);
}
}
public class ApplicationMenu
{
private static ContextMenuExtension cme;
public static void Attach()
{
if (cme == null)
{
cme = new ContextMenuExtension();
cme.Title = "Kean's commands";
MenuItem mi1 = new MenuItem("1st");
mi1.Click += new EventHandler(On1st);
cme.MenuItems.Add(mi1);
MenuItem mi2 = new MenuItem("2nd");
mi2.Click += new EventHandler(On2nd);
cme.MenuItems.Add(mi2);
MenuItem mi3 = new MenuItem("3rd");
mi3.Click += new EventHandler(On3rd);
cme.MenuItems.Add(mi3);
}
Application.AddDefaultContextMenuExtension(cme);
}
public static void Detach()
{
Application.RemoveDefaultContextMenuExtension(cme);
}
private static void On1st(Object o, EventArgs e)
{
Editor ed =
Application.DocumentManager.MdiActiveDocument.Editor;
ed.WriteMessage("\nFirst item selected.");
Utils.PostCommandPrompt();
}
private static void On2nd(Object o, EventArgs e)
{
Editor ed =
Application.DocumentManager.MdiActiveDocument.Editor;
ed.WriteMessage("\nSecond item selected.");
Utils.PostCommandPrompt();
}
private static void On3rd(Object o, EventArgs e)
{
Editor ed =
Application.DocumentManager.MdiActiveDocument.Editor;
ed.WriteMessage("\nThird item selected.");
Utils.PostCommandPrompt();
}
}
}
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