可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试):
问题:
I notice that Project 2007 has the functions that allow operations that can be undone to be placed in a single stack item, or "undo transaction". For example:
Application.OpenUndoTransaction "Create 6 tasks" Dim i As Integer For i = 1 To 6 ActiveProject.Tasks.Add "UndoMe " & i Next Application.CloseUndoTransaction
What this means is that the user can undo all of the actions in a single undo action, rather than 6 times.
This would be great to implement in Word and/or Excel, as I'm doing some things in VSTO that make multiple changes at once, and it'll be a bit annoying for the user if they have to click on Undo several times if they make a mistake. Although those specific functions don't appear to exist, does anyone know if / how this can be done in some way?
回答1:
You can simulate transactional behavior in Word by overwriting the Undo and Redo command routines in VBA (I don't think that overwriting built-in Word commands is possible using VSTO alone, though). The start of a transaction is marked by adding a bookmark, the end is marked by removing the bookmark.
When calling undo, we check whether the transaction mark bookmark is present and repeat the undo until the marker is gone. Redo is working the same way. This mechanism supports transactional undo/redo of all modifications done to the document content. However, to allow undo/redo of modifications to the document properties a special mechanism needs to be implemented using the SetCustomProp macro. Document properties should not be set directly but via this macro only.
Update: I forgot to clearly mention that this approach only works with the keyboard shortcuts and the menu commands, clicking the toolbar button still does a single-step undo. We therefore decided to replace the toolbar buttons with custom ones. The code has been in use for quite a while With Word 2003 (it's not tested with Word 2007, so be prepared for surprise ;)
Option Explicit ' string constants for Undo mechanism Public Const BM_IN_MACRO As String = "_InMacro_" Public Const BM_DOC_PROP_CHANGE As String = "_DocPropChange_" Public Const BM_DOC_PROP_NAME As String = "_DocPropName_" Public Const BM_DOC_PROP_OLD_VALUE As String = "_DocPropOldValue_" Public Const BM_DOC_PROP_NEW_VALUE As String = "_DocPropNewValue_" '----------------------------------------------------------------------------------- ' Procedure : EditUndo ' Purpose : Atomic undo of macros ' Note: This macro only catches the menu command and the keyboard shortcut, ' not the toolbar command '----------------------------------------------------------------------------------- Public Sub EditUndo() ' Catches Ctrl-Z 'On Error Resume Next Dim bRefresh As Boolean bRefresh = Application.ScreenUpdating Application.ScreenUpdating = False Do If ActiveDocument.Bookmarks.Exists(BM_DOC_PROP_CHANGE) Then Dim strPropName As String Dim strOldValue As String strPropName = ActiveDocument.Bookmarks(BM_DOC_PROP_NAME).Range.Text strOldValue = ActiveDocument.Bookmarks(BM_DOC_PROP_OLD_VALUE).Range.Text ActiveDocument.CustomDocumentProperties(strPropName).Value = strOldValue End If Loop While (ActiveDocument.Undo = True) _ And ActiveDocument.Bookmarks.Exists(BM_IN_MACRO) Application.ScreenUpdating = bRefresh End Sub '----------------------------------------------------------------------------------- ' Procedure : EditRedo ' Purpose : Atomic redo of macros ' Note: This macro only catches the menu command and the keyboard shortcut, ' not the toolbar command '----------------------------------------------------------------------------------- Public Sub EditRedo() ' Catches Ctrl-Y Dim bRefresh As Boolean bRefresh = Application.ScreenUpdating Application.ScreenUpdating = False Do If ActiveDocument.Bookmarks.Exists(BM_DOC_PROP_CHANGE) Then Dim strPropName As String Dim strNewValue As String strPropName = ActiveDocument.Bookmarks(BM_DOC_PROP_NAME).Range.Text strNewValue = ActiveDocument.Bookmarks(BM_DOC_PROP_NEW_VALUE).Range.Text ActiveDocument.CustomDocumentProperties(strPropName).Value = strNewValue End If Loop While (ActiveDocument.Redo = True) _ And ActiveDocument.Bookmarks.Exists(BM_IN_MACRO) Application.ScreenUpdating = bRefresh End Sub '----------------------------------------------------------------------------------- ' Procedure : SetCustomProp ' Purpose : Sets a custom document property '----------------------------------------------------------------------------------- Public Function SetCustomProp(oDoc As Document, strName As String, strValue As String) Dim strOldValue As String On Error GoTo existsAlready strOldValue = "" oDoc.CustomDocumentProperties.Add _ Name:=strName, LinkToContent:=False, Value:=Trim(strValue), _ Type:=msoPropertyTypeString GoTo exitHere existsAlready: strOldValue = oDoc.CustomDocumentProperties(strName).Value oDoc.CustomDocumentProperties(strName).Value = strValue exitHere: ' support undo / redo of changes to the document properties 'On Error Resume Next Dim bCalledWithoutUndoSupport As Boolean If Not ActiveDocument.Bookmarks.Exists(BM_IN_MACRO) Then ActiveDocument.Range.Bookmarks.Add BM_IN_MACRO, ActiveDocument.Range bCalledWithoutUndoSupport = True End If Dim oRange As Range Set oRange = ActiveDocument.Range oRange.Collapse wdCollapseEnd oRange.Text = " " oRange.Bookmarks.Add "DocPropDummy_", oRange oRange.Collapse wdCollapseEnd oRange.Text = strName oRange.Bookmarks.Add BM_DOC_PROP_NAME, oRange oRange.Collapse wdCollapseEnd oRange.Text = strOldValue oRange.Bookmarks.Add BM_DOC_PROP_OLD_VALUE, oRange oRange.Collapse wdCollapseEnd oRange.Text = strValue oRange.Bookmarks.Add BM_DOC_PROP_NEW_VALUE, oRange oRange.Bookmarks.Add BM_DOC_PROP_CHANGE ActiveDocument.Bookmarks(BM_DOC_PROP_CHANGE).Delete Set oRange = ActiveDocument.Bookmarks(BM_DOC_PROP_NEW_VALUE).Range ActiveDocument.Bookmarks(BM_DOC_PROP_NEW_VALUE).Delete If Len(oRange.Text) > 0 Then oRange.Delete Set oRange = ActiveDocument.Bookmarks(BM_DOC_PROP_OLD_VALUE).Range ActiveDocument.Bookmarks(BM_DOC_PROP_OLD_VALUE).Delete If Len(oRange.Text) > 0 Then oRange.Delete Set oRange = ActiveDocument.Bookmarks(BM_DOC_PROP_NAME).Range ActiveDocument.Bookmarks(BM_DOC_PROP_NAME).Delete If Len(oRange.Text) > 0 Then oRange.Delete Set oRange = ActiveDocument.Bookmarks("DocPropDummy_").Range ActiveDocument.Bookmarks("DocPropDummy_").Delete If Len(oRange.Text) > 0 Then oRange.Delete If bCalledWithoutUndoSupport And ActiveDocument.Bookmarks.Exists(BM_IN_MACRO) Then ActiveDocument.Bookmarks(BM_IN_MACRO).Delete End If End Function '----------------------------------------------------------------------------------- ' Procedure : SampleUsage ' Purpose : Demonstrates a transaction '----------------------------------------------------------------------------------- Private Sub SampleUsage() On Error Resume Next ' mark begin of transaction ActiveDocument.Range.Bookmarks.Add BM_IN_MACRO Selection.Text = "Hello World" ' do other stuff ' mark end of transaction ActiveDocument.Bookmarks(BM_IN_MACRO).Delete End Sub
回答2:
回答3:
I've been chewing on this one for a while. Here's my attempt at using a hidden document, then grabbing the WordOpenXML from the hidden document and placing it in the real document when needed to make any amount of VSTO actions a single undo.
//Usage from ThisDocument VSTO Document level project public partial class ThisDocument { //Used to buffer writing text & formatting to document (to save undo stack) public static DocBuffer buffer; //Attached Template public static Word.Template template; private void ThisDocument_Startup(object sender, System.EventArgs e) { //Ignore changes to template (removes prompt to save changes to template) template = (Word.Template)this.Application.ActiveDocument.get_AttachedTemplate(); template.Saved = true; //Document buffer buffer = new DocBuffer(); //Start buffer ThisDocument.buffer.Start(); //This becomes one "undo" Word.Selection curSel = Globals.ThisDocument.Application.Selection; curSel.TypeText(" "); curSel.TypeBackspace(); curSel.Font.Bold = 1; curSel.TypeText("Hello, world!"); curSel.Font.Bold = 0; curSel.TypeText(" "); //end buffer, print out text ThisDocument.buffer.End(); } void Application_DocumentBeforeClose(Microsoft.Office.Interop.Word.Document Doc, ref bool Cancel) { buffer.Close(); } private void ThisDocument_Shutdown(object sender, System.EventArgs e) { buffer.Close(); } }
Here is the DocBuffer Class:
public class DocBuffer { //Word API Objects Word._Document HiddenDoc; Word.Selection curSel; Word.Template template; //ref parameters object missing = System.Type.Missing; object FalseObj = false; //flip this for docbuffer troubleshooting object templateObj; //Is docbuffer running? public Boolean started{ get; private set; } //Open document on new object public DocBuffer() { //Clear out unused buffer bookmarks Word.Bookmarks bookmarks = Globals.ThisDocument.Application.ActiveDocument.Bookmarks; bookmarks.ShowHidden = true; foreach (Word.Bookmark mark in bookmarks) { if (mark.Name.Contains("_buf")) { mark.Delete(); } } //Remove trail of undo's for clearing out the bookmarks Globals.ThisDocument.UndoClear(); //Set up template template = ThisDocument.template; templateObj = template; //Open Blank document, then attach styles *and update HiddenDoc = Globals.ThisDocument.Application.Documents.Add(ref missing, ref missing, ref missing, ref FalseObj); HiddenDoc.set_AttachedTemplate(ref templateObj); HiddenDoc.UpdateStyles(); //Tell hidden document it has been saved to remove rare prompt to save document HiddenDoc.Saved = true; //Make primary document active Globals.ThisDocument.Activate(); } ~DocBuffer() { try { HiddenDoc.Close(ref FalseObj, ref missing, ref missing); } catch { } } public void Close() { try { HiddenDoc.Close(ref FalseObj, ref missing, ref missing); } catch { } } public void Start() { try { //Make hidden document active to receive selection HiddenDoc.Activate(); //results in a slight application focus loss } catch (System.Runtime.InteropServices.COMException ex) { if (ex.Message == "Object has been deleted.") { //Open Blank document, then attach styles *and update HiddenDoc = Globals.ThisDocument.Application.Documents.Add(ref missing, ref missing, ref missing, ref FalseObj); HiddenDoc.set_AttachedTemplate(ref templateObj); HiddenDoc.UpdateStyles(); HiddenDoc.Activate(); } else throw; } //Remove Continue Bookmark, if exists Word.Bookmarks hiddenDocBookmarks = Globals.ThisDocument.Application.ActiveDocument.Bookmarks; if (hiddenDocBookmarks.Exists("Continue")) { object deleteMarkObj = "Continue"; Word.Bookmark deleteMark = hiddenDocBookmarks.get_Item(ref deleteMarkObj); deleteMark.Select(); deleteMark.Delete(); } //Tell hidden document it has been saved to remove rare prompt to save document HiddenDoc.Saved = true; //Keep track when started started = true; } //Used for non-modal dialogs to bring active document back up between text insertion public void Continue() { //Exit quietly if buffer hasn't started if (!started) return; //Verify hidden document is active if ((HiddenDoc as Word.Document) != Globals.ThisDocument.Application.ActiveDocument) { HiddenDoc.Activate(); } //Hidden doc selection curSel = Globals.ThisDocument.Application.Selection; //Hidden doc range Word.Range bufDocRange; //Select entire doc, save range curSel.WholeStory(); bufDocRange = curSel.Range; //Find end, put a bookmark there bufDocRange.SetRange(curSel.End, curSel.End); object bookmarkObj = bufDocRange; //Generate "Continue" hidden bookmark Word.Bookmark mark = Globals.ThisDocument.Application.ActiveDocument.Bookmarks.Add("Continue", ref bookmarkObj); mark.Select(); //Tell hidden document it has been saved to remove rare prompt to save document HiddenDoc.Saved = true; //Make primary document active Globals.ThisDocument.Activate(); } public void End() { //Exit quietly if buffer hasn't started if (!started) return; //Turn off buffer started flag started = false; //Verify hidden document is active if ((HiddenDoc as Word.Document) != Globals.ThisDocument.Application.ActiveDocument) { HiddenDoc.Activate(); } //Remove Continue Bookmark, if exists Word.Bookmarks hiddenDocBookmarks = Globals.ThisDocument.Application.ActiveDocument.Bookmarks; hiddenDocBookmarks.ShowHidden = true; if (hiddenDocBookmarks.Exists("Continue")) { object deleteMarkObj = "Continue"; Word.Bookmark deleteMark = hiddenDocBookmarks.get_Item(ref deleteMarkObj); deleteMark.Delete(); } //Hidden doc selection curSel = Globals.ThisDocument.Application.Selection; //Hidden doc range Word.Range hiddenDocRange; Word.Range bufDocRange; //Select entire doc, save range curSel.WholeStory(); bufDocRange = curSel.Range; //If cursor bookmark placed in, move there, else find end of text, put a bookmark there Boolean cursorFound = false; if (hiddenDocBookmarks.Exists("_cursor")) { object cursorBookmarkObj = "_cursor"; Word.Bookmark cursorBookmark = hiddenDocBookmarks.get_Item(ref cursorBookmarkObj); bufDocRange.SetRange(cursorBookmark.Range.End, cursorBookmark.Range.End); cursorBookmark.Delete(); cursorFound = true; } else { //The -2 is done because [range object].WordOpenXML likes to drop bookmarks at the end of the range bufDocRange.SetRange(curSel.End - 2, curSel.End - 2); } object bookmarkObj = bufDocRange; //Generate GUID for hidden bookmark System.Guid guid = System.Guid.NewGuid(); String id = "_buf" + guid.ToString().Replace("-", string.Empty); Word.Bookmark mark = Globals.ThisDocument.Application.ActiveDocument.Bookmarks.Add(id, ref bookmarkObj); //Get OpenXML Text (Text with formatting) curSel.WholeStory(); hiddenDocRange = curSel.Range; string XMLText = hiddenDocRange.WordOpenXML; //Clear out contents of buffer hiddenDocRange.Delete(ref missing, ref missing); //comment this for docbuffer troubleshooting //Tell hidden document it has been saved to remove rare prompt to save document HiddenDoc.Saved = true; //Make primary document active Globals.ThisDocument.Activate(); //Get selection from new active document curSel = Globals.ThisDocument.Application.Selection; //insert buffered formatted text into main document curSel.InsertXML(XMLText, ref missing); //Place cursor at bookmark+1 (this is done due to WordOpenXML ignoring bookmarks at the end of the selection) Word.Bookmarks bookmarks = Globals.ThisDocument.Application.ActiveDocument.Bookmarks; bookmarks.ShowHidden = true; object stringObj = id; Word.Bookmark get_mark = bookmarks.get_Item(ref stringObj); bufDocRange = get_mark.Range; if (cursorFound) //Canned language actively placed cursor bufDocRange.SetRange(get_mark.Range.End, get_mark.Range.End); else //default cursor at the end of text bufDocRange.SetRange(get_mark.Range.End + 1, get_mark.Range.End + 1); bufDocRange.Select(); }
回答4:
Excel has some (limited) built-in support for undo and redo as part of its VBA architecture.
I'm not familiar with vsto, so I don't know if this will help you out, but you can take a look at this SO question for more details.
