The answers proposed work, but none of them are as nice as eclipse with regard to how they preserve the existing paste buffer, the currently selected characters, and they do not allow the user to operate upon a range of lines. Here is a solution I came up with that preserves the paste buffer, the current character selection, and works with or without a selection (that may or may not span multiple rows):
'' Duplicates the current line (or selection of lines) and places the copy
'' one line below or above the current cursor position (based upon the parameter)
Sub CopyLine(ByVal movingDown As Boolean)
DTE.UndoContext.Open("CopyLine")
Dim objSel As TextSelection = DTE.ActiveDocument.Selection
' store the original selection and cursor position
Dim topPoint As TextPoint = objSel.TopPoint
Dim bottomPoint As TextPoint = objSel.BottomPoint
Dim lTopLine As Long = topPoint.Line
Dim lTopColumn As Long = topPoint.LineCharOffset
Dim lBottomLine As Long = bottomPoint.Line
Dim lBottomColumn As Long = bottomPoint.LineCharOffset()
' copy each line from the top line to the bottom line
Dim readLine As Long = lTopLine
Dim endLine As Long = lBottomLine + 1
Dim selectionPresent As Boolean = ((lTopLine <> lBottomLine) Or (lTopColumn <> lBottomColumn))
If (selectionPresent And (lBottomColumn = 1)) Then
' A selection is present, but the cursor is in front of the first character
' on the bottom line. exclude that bottom line from the copy selection.
endLine = lBottomLine
End If
' figure out how many lines we are copying, so we can re-position
' our selection after the copy is done
Dim verticalOffset As Integer = 0
If (movingDown) Then
verticalOffset = endLine - lTopLine
End If
' copy each line, one at a time.
' The Insert command doesn't handle multiple lines well, and we need
' to use Insert to avoid autocompletions
Dim insertLine As Long = endLine
While (readLine < endLine)
' move to read postion, and read the current line
objSel.MoveToLineAndOffset(readLine, 1)
objSel.EndOfLine(True) 'extend to EOL
Dim lineTxt As String = objSel.Text.Clone
' move to the destination position, and insert the copy
objSel.MoveToLineAndOffset(insertLine, 1)
objSel.Insert(lineTxt)
objSel.NewLine()
' adjust the read & insertion points
readLine = readLine + 1
insertLine = insertLine + 1
End While
' restore the cursor to original position and selection
objSel.MoveToLineAndOffset(lBottomLine + verticalOffset, lBottomColumn)
objSel.MoveToLineAndOffset(lTopLine + verticalOffset, lTopColumn, True)
DTE.UndoContext.Close()
End Sub
'' Duplicates the current line (or selection of lines) and places the copy
'' one line below the current cursor position
Sub CopyLineDown()
CopyLine(True)
End Sub
'' Duplicates the current line (or selection of lines) and places the copy
'' one line above the current cursor position
Sub CopyLineUp()
CopyLine(False)
End Sub
'' Moves the selected lines up one line. If no line is
'' selected, the current line is moved.
''
Sub MoveLineUp()
DTE.UndoContext.Open("MoveLineUp")
Dim objSel As TextSelection = DTE.ActiveDocument.Selection
' store the original selection and cursor position
Dim topPoint As TextPoint = objSel.TopPoint
Dim bottomPoint As TextPoint = objSel.BottomPoint
Dim lTopLine As Long = topPoint.Line
Dim lTopColumn As Long = topPoint.LineCharOffset
Dim lBottomLine As Long = bottomPoint.Line
Dim lBottomColumn As Long = bottomPoint.LineCharOffset()
Dim textLineAbove As TextSelection = DTE.ActiveDocument.Selection
textLineAbove.MoveToLineAndOffset(lTopLine - 1, 1, False)
textLineAbove.MoveToLineAndOffset(lTopLine, 1, True)
Dim indentChange As Integer = CountIndentations(textLineAbove.Text) * -1
' If multiple lines are selected, but the bottom line doesn't
' have any characters selected, don't count it as selected
Dim lEffectiveBottomLine = lBottomLine
If ((lBottomColumn = 1) And (lBottomLine <> lTopLine)) Then
lEffectiveBottomLine = lBottomLine - 1
End If
' move to the line above the top line
objSel.MoveToLineAndOffset(lTopLine - 1, 1)
' and move it down, until its below the bottom line:
Do
DTE.ExecuteCommand("Edit.LineTranspose")
Loop Until (objSel.BottomPoint.Line >= lEffectiveBottomLine)
' Since the line we are on has moved up, our location in the file has changed:
lTopLine = lTopLine - 1
lBottomLine = lBottomLine - 1
IndentBlockAndRestoreSelection(objSel, lBottomLine, lBottomColumn, lTopLine, lTopColumn, indentChange)
DTE.UndoContext.Close()
End Sub
'' Moves the selected lines down one line. If no line is
'' selected, the current line is moved.
''
Sub MoveLineDown()
DTE.UndoContext.Open("MoveLineDown")
Dim objSel As TextSelection = DTE.ActiveDocument.Selection
' store the original selection and cursor position
Dim topPoint As TextPoint = objSel.TopPoint
Dim bottomPoint As TextPoint = objSel.BottomPoint
Dim lTopLine As Long = topPoint.Line
Dim lTopColumn As Long = topPoint.LineCharOffset
Dim lBottomLine As Long = bottomPoint.Line
Dim lBottomColumn As Long = bottomPoint.LineCharOffset()
' If multiple lines are selected, but the bottom line doesn't
' have any characters selected, don't count it as selected
Dim lEffectiveBottomLine = lBottomLine
If ((lBottomColumn = 1) And (lBottomLine <> lTopLine)) Then
lEffectiveBottomLine = lBottomLine - 1
End If
Dim textLineBelow As TextSelection = DTE.ActiveDocument.Selection
textLineBelow.MoveToLineAndOffset(lEffectiveBottomLine + 1, 1, False)
textLineBelow.MoveToLineAndOffset(lEffectiveBottomLine + 2, 1, True)
Dim indentChange As Integer = CountIndentations(textLineBelow.Text)
' move to the bottom line
objSel.MoveToLineAndOffset(lEffectiveBottomLine, 1)
' and move it down, which effectively moves the line below it up
' then move the cursor up, always staying one line above the line
' that is moving up, and keep moving it up until its above the top line:
Dim lineCount As Long = lEffectiveBottomLine - lTopLine
Do
DTE.ExecuteCommand("Edit.LineTranspose")
objSel.LineUp(False, 2)
lineCount = lineCount - 1
Loop Until (lineCount < 0)
' Since the line we are on has moved down, our location in the file has changed:
lTopLine = lTopLine + 1
lBottomLine = lBottomLine + 1
IndentBlockAndRestoreSelection(objSel, lBottomLine, lBottomColumn, lTopLine, lTopColumn, indentChange)
DTE.UndoContext.Close()
End Sub
'' This method takes care of indenting the selected text by the indentChange parameter
'' It then restores the selection to the lTopLine:lTopColumn - lBottomLine:lBottomColumn parameter.
'' It will adjust these values according to the indentChange performed
Sub IndentBlockAndRestoreSelection(ByVal objSel As TextSelection, ByVal lBottomLine As Long, ByVal lBottomColumn As Long, ByVal lTopLine As Long, ByVal lTopColumn As Long, ByVal indentChange As Integer)
' restore the cursor to original position and selection
objSel.MoveToLineAndOffset(lBottomLine, lBottomColumn)
objSel.MoveToLineAndOffset(lTopLine, lTopColumn, True)
If (indentChange = 0) Then
' If we don't change the indent, we are done
Return
End If
If (lBottomLine = lTopLine) Then
If (indentChange > 0) Then
objSel.StartOfLine()
Else
objSel.StartOfLine()
objSel.WordRight()
End If
End If
objSel.Indent(indentChange)
' Since the selected text has changed column, adjust the columns accordingly:
' restore the cursor to original position and selection
Dim lNewBottomColumn As Long = (lBottomColumn + indentChange)
Dim lNewTopColumn As Long = (lTopColumn + indentChange)
' ensure that we we still on the page.
' The "or" clause makes it so if we were at the left edge of the line, we remain on the left edge.
If ((lNewBottomColumn < 2) Or (lBottomColumn = 1)) Then
' Single line selections, or a bottomColumn that is already at 1 may still have a new BottomColumn of 1
If ((lTopLine = lBottomLine) Or (lBottomColumn = 1)) Then
lNewBottomColumn = 1
Else
' If we have multiple lines selected, don't allow the bottom edge to touch the left column,
' or the next move will ignore that bottom line.
lNewBottomColumn = 2
End If
End If
If ((lNewTopColumn < 2) Or (lTopColumn = 1)) Then
lNewTopColumn = 1
End If
' restore the selection to the modified selection
objSel.MoveToLineAndOffset(lBottomLine, lNewBottomColumn)
objSel.MoveToLineAndOffset(lTopLine, lNewTopColumn, True)
End Sub
'' This method counts the indentation changes within the text provided as the paramter
Function CountIndentations(ByVal text As String) As Integer
Dim indent As Integer = 0
While (Text.Length > 0)
If (Text.StartsWith("//")) Then
Dim endOfLine As Integer = Text.IndexOf("
", 2)
If (Equals(endOfLine, -1)) Then
' The remaining text is all on one line, so the '//' terminates our search
' Ignore the rest of the text
Exit While
End If
' continue looking after the end of line
Text = Text.Substring(endOfLine + 1)
End If
If (Text.StartsWith("/*")) Then
Dim endComment As Integer = Text.IndexOf("*/", 2)
If (Equals(endComment, -1)) Then
' This comment continues beyond the length of this line.
' Ignore the rest of the text
Exit While
End If
' continue looking after the end of this comment block
Text = Text.Substring(endComment + 1)
End If
If (Text.StartsWith("{")) Then
indent = indent + 1
Else
If (Text.StartsWith("}")) Then
indent = indent - 1
End If
End If
Text = Text.Substring(1)
End While
Return indent
End Function
I edited this post to add the UndoContext mechanism (suggested by Nicolas Dorier) at the beginning of the MoveLineUp() and MoveLineDown() methods and closing it at their end.
11/23/11 - I updated this again to allow the moved lines to indent themselves as you cross bracket boundaries
