CompoundViewAction Class
Manages multiple edit actions that are treated as a single operation, optimized for a text view.
This API is not CLS-compliant. The CLS-compliant alternative is [None].
Namespace: Microsoft.VisualStudio.Package
Assembly: Microsoft.VisualStudio.Package.LanguageService (in Microsoft.VisualStudio.Package.LanguageService.dll)
Syntax
'Declaration
<CLSCompliantAttribute(False)> _
Public Class CompoundViewAction _
Inherits CompoundActionBase
'Usage
Dim instance As CompoundViewAction
[CLSCompliantAttribute(false)]
public class CompoundViewAction : CompoundActionBase
[CLSCompliantAttribute(false)]
public ref class CompoundViewAction : public CompoundActionBase
public class CompoundViewAction extends CompoundActionBase
Remarks
This class is used to simplify wrapping a collection of edit operations into a single operation. This is achieved by calling the OpenCompoundAction method on the IVsCompoundAction interface that is obtained from the specified IVsTextView object. When this class is disposed of, the IVsCompoundAction interface is closed and that commits all the edit events made to the IVsTextLines object as a single operation.
Notes to Implementers:
This class contains everything necessary to open a compound action given an IVsTextView object and to close that action when this class is disposed of.
Notes to Callers:
Instantiate a CompoundViewAction object with the IVsTextView object when you need to wrap one or more edit operations that can be undone in a single action. Then perform your edit operations as normal. When the new CompoundViewAction object is disposed of, the edit operations are stored as a single operation.
Use this class in preference to the CompoundAction class as this class allows the text view to optimize any edits made.
Note
Since the CompoundViewAction class works directly with the view, the colorizer does not need to be suspended by the class.
Examples
This example shows how to use the CompoundViewAction class. This example inserts a list of words at the current location in the source file. Without the CompoundViewAction object, each of these insertions is treated as a separate edit event and requires a separate undo operation. However, with the CompoundViewAction object, the entire list can be undone with a single undo.
using Microsoft.VisualStudio.Package
namespace MyLanguagePackage
{
class CMyLanguageService : LanguageService
{
// Insert the list of words, one per line.
void InsertWords(Source src,string[] wordList)
{
if (LastActiveTextView != null)
{
CompoundViewAction action = new CompoundViewAction(LastActiveTextView,
"Update source");
using (action)
{
int currentLine = 0;
int currentCol = 0;
LastActiveTextView.GetCaretPos(out currentLine, out currentCol);
// Insert list in reverse so the words appear in the proper
// order in the sourec file.
for (int i = wordList.Length - 1, i >= 0; i--)
{
string w = wordList[i] + "\n";
src.SetText(currentLine, currentCol, currentLine, currentCol, w);
}
}
}
}
}
}
Inheritance Hierarchy
System.Object
Microsoft.VisualStudio.Package.CompoundActionBase
Microsoft.VisualStudio.Package.CompoundViewAction
Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.