监视用户是保存用户编辑还是放弃参照编辑

【原文】

 1 using Autodesk.AutoCAD.ApplicationServices;
 2 using Autodesk.AutoCAD.DatabaseServices;
 3 using Autodesk.AutoCAD.EditorInput;
 4 using Autodesk.AutoCAD.Runtime;
 5 
 6 // 此行不是强制性的，但可以提高装载性能
 7 [assembly: CommandClass(typeof(监视用户是保存用户编辑还是放弃参照编辑.XrefLongTrans))]
 8 
 9 namespace 监视用户是保存用户编辑还是放弃参照编辑
10 {
11     public class XrefLongTrans
12     {
13         enum EditInPlaceXrefState
14         {
15             Discarded,
16             Saved
17         };
18 
19         static EditInPlaceXrefState state = EditInPlaceXrefState.Discarded;
20 
21         [CommandMethod("WatchXref")]
22         public void WatchXref()
23         {
24             Document doc = Application.DocumentManager.MdiActiveDocument;
25             if (doc == null) return;
26             Editor ed = doc.Editor;
27             LongTransactionManager longTranMan = Application.LongTransactionManager;
28             longTranMan.CheckedIn += TrMan_CheckedIn;
29             longTranMan.Aborted += TrMan_Aborted;
30             doc.CommandEnded += Doc_CommandEnded;
31         }
32         [CommandMethod("UnWatchXref")]
33         public void UnWatchXref()
34         {
35             Document doc = Application.DocumentManager.MdiActiveDocument;
36             if (doc == null) return;
37             Editor ed = doc.Editor;
38             LongTransactionManager longTranMan = Application.LongTransactionManager;
39             longTranMan.CheckedIn -= TrMan_CheckedIn;
40             longTranMan.Aborted -= TrMan_Aborted;
41             doc.CommandEnded -= Doc_CommandEnded;
42         }
43 
44         private void TrMan_Aborted(object sender, LongTransactionEventArgs e)
45         {
46             Document doc = Application.DocumentManager.MdiActiveDocument;
47             if (doc == null) return;
48             Editor ed = doc.Editor;
49             if (e.Transaction.Type == LongTransactionType.XRefDb)
50             {
51                 ed.WriteMessage("
Long transaction {0} aborted
", e.Transaction.LongTransactionName);
52                 state = EditInPlaceXrefState.Discarded;
53             }
54         }
55 
56         private void TrMan_CheckedIn(object sender, LongTransactionEventArgs e)
57         {
58             Document doc = Application.DocumentManager.MdiActiveDocument;
59             if (doc == null) return;
60             Editor ed = doc.Editor;
61             if (e.Transaction.Type == LongTransactionType.XRefDb)
62             {
63                 ed.WriteMessage("
Long transaction {0} commited
", e.Transaction.LongTransactionName);
64                 state = EditInPlaceXrefState.Saved;
65             }
66         }
67 
68         private void Doc_CommandEnded(object sender, CommandEventArgs e)
69         {
70             if (e.GlobalCommandName.ToUpper() == "REFCLOSE")
71             {
72                 Document doc = Application.DocumentManager.MdiActiveDocument;
73                 if (doc == null) return;
74                 Editor ed = doc.Editor;
75                 ed.WriteMessage("
Modification of XREF {0}
", (state == EditInPlaceXrefState.Saved) ? "Saved" : "Discarded");
76             }
77         }
78     }
79 }