[用户交互] AUTOCAD中添加默认菜单

萧闫子

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:

1. using Autodesk.AutoCAD.ApplicationServices;
   
2. using Autodesk.AutoCAD.DatabaseServices;
   
3. using Autodesk.AutoCAD.EditorInput;
   
4. using Autodesk.AutoCAD.Runtime;
   
5. using Autodesk.AutoCAD.Windows;
   
6. using Autodesk.AutoCAD.Internal;
   
7. using System;
   
8. 
   
9. namespace ContextMenuApplication
   
10. {
    
11. public class Commands : IExtensionApplication
    
12. {
    
13. public void Initialize()
    
14. {
    
15.    CountMenu.Attach();
    
16.    ApplicationMenu.Attach();
    
17. }
    
18. public void Terminate()
    
19. {
    
20.    CountMenu.Detach();
    
21.    ApplicationMenu.Detach();
    
22. }
    
23. 
    
24. [CommandMethod("ADDCONTEXT")]
    
25. static public void AttachContextMenus()
    
26. {
    
27.    CountMenu.Attach();
    
28.    ApplicationMenu.Attach();
    
29. }
    
30. [CommandMethod("NOCONTEXT")]
    
31. static public void DetachContextMenus()
    
32. {
    
33.    CountMenu.Detach();
    
34.    ApplicationMenu.Detach();
    
35. }
    
36. [CommandMethod("COUNT", CommandFlags.UsePickSet)]
    
37. static public void CountSelection()
    
38. {
    
39.    Editor ed =
    
40.       Application.DocumentManager.MdiActiveDocument.Editor;
    
41. 
    
42.    PromptSelectionResult psr = ed.GetSelection();
    
43.    if (psr.Status == PromptStatus.OK)
    
44.    {
    
45.       ed.WriteMessage(
    
46.       "\nSelected {0} entities.",
    
47.       psr.Value.Count
    
48.       );
    
49.    }
    
50. }
    
51. }
    
52. 
    
53. public class CountMenu
    
54. {
    
55. private static ContextMenuExtension cme;
    
56. 
    
57. public static void Attach()
    
58. {
    
59.    if (cme == null)
    
60.    {
    
61.       cme = new ContextMenuExtension();
    
62.       MenuItem mi = new MenuItem("Count");
    
63.       mi.Click += new EventHandler(OnCount);
    
64.       cme.MenuItems.Add(mi);
    
65.    }
    
66.    RXClass rxc = Entity.GetClass(typeof(Entity));
    
67.    Application.AddObjectContextMenuExtension(rxc, cme);
    
68. }
    
69. public static void Detach()
    
70. {
    
71.    RXClass rxc = Entity.GetClass(typeof(Entity));
    
72.    Application.RemoveObjectContextMenuExtension(rxc, cme);
    
73. }
    
74. private static void OnCount(Object o, EventArgs e)
    
75. {
    
76.    Document doc =
    
77.       Application.DocumentManager.MdiActiveDocument;
    
78.    doc.SendStringToExecute("_.COUNT ", true, false, false);
    
79. }
    
80. }
    
81. 
    
82. public class ApplicationMenu
    
83. {
    
84. private static ContextMenuExtension cme;
    
85. 
    
86. public static void Attach()
    
87. {
    
88.    if (cme == null)
    
89.    {
    
90.       cme = new ContextMenuExtension();
    
91.       cme.Title = "Kean's commands";
    
92.       MenuItem mi1 = new MenuItem("1st");
    
93.       mi1.Click += new EventHandler(On1st);
    
94.       cme.MenuItems.Add(mi1);
    
95.       MenuItem mi2 = new MenuItem("2nd");
    
96.       mi2.Click += new EventHandler(On2nd);
    
97.       cme.MenuItems.Add(mi2);
    
98.       MenuItem mi3 = new MenuItem("3rd");
    
99.       mi3.Click += new EventHandler(On3rd);
    
100.       cme.MenuItems.Add(mi3);
     
101.    }
     
102.    Application.AddDefaultContextMenuExtension(cme);
     
103. }
     
104. public static void Detach()
     
105. {
     
106.    Application.RemoveDefaultContextMenuExtension(cme);
     
107. }
     
108. private static void On1st(Object o, EventArgs e)
     
109. {
     
110.    Editor ed =
     
111.       Application.DocumentManager.MdiActiveDocument.Editor;
     
112.    ed.WriteMessage("\nFirst item selected.");
     
113.    Utils.PostCommandPrompt();
     
114. }
     
115. private static void On2nd(Object o, EventArgs e)
     
116. {
     
117.    Editor ed =
     
118.       Application.DocumentManager.MdiActiveDocument.Editor;
     
119.    ed.WriteMessage("\nSecond item selected.");
     
120.    Utils.PostCommandPrompt();
     
121. }
     
122. private static void On3rd(Object o, EventArgs e)
     
123. {
     
124.    Editor ed =
     
125.       Application.DocumentManager.MdiActiveDocument.Editor;
     
126.    ed.WriteMessage("\nThird item selected.");
     
127.    Utils.PostCommandPrompt();
     
128. }
     
129. }
     
130. }
     

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