protected override void DoOperation() => _history.PreviousEntry();
public override CommandResult Invoke(Guid group, int id, object inputArg, ref object outputArg)
{
if (_completionBroker.IsCompletionActive(TextView))
{
return(CommandResult.NotSupported);
}
var window = _interactiveWorkflow.ActiveWindow;
var curPoint = window.TextView.MapDownToBuffer(
window.TextView.Caret.Position.BufferPosition,
window.CurrentLanguageBuffer
);
bool extend = id == (int)VSConstants.VSStd2KCmdID.UP_EXT ||
id == (int)VSConstants.VSStd2KCmdID.DOWN_EXT ||
id == (int)VSConstants.VSStd2KCmdID.RIGHT_EXT ||
id == (int)VSConstants.VSStd2KCmdID.LEFT_EXT;
var editorOps = _editorFactory.GetEditorOperations(TextView);
if (curPoint != null)
{
var curLine = curPoint.Value.GetContainingLine();
switch ((VSConstants.VSStd2KCmdID)id)
{
// history navigates if we're on the top or bottom line
case VSConstants.VSStd2KCmdID.UP:
if (curLine.LineNumber == 0)
{
// this leaves the caret at the end which is what we want for up/down to work nicely
_history.PreviousEntry();
return(CommandResult.Executed);
}
break;
case VSConstants.VSStd2KCmdID.DOWN:
if (curLine.LineNumber == curPoint.Value.Snapshot.LineCount - 1)
{
_history.NextEntry();
// move the caret to the 1st line in history so down/up works nicely
var firstLine = window.CurrentLanguageBuffer.CurrentSnapshot.GetLineFromLineNumber(0);
var upperPoint = MapUp(window, firstLine.Start);
window.TextView.Caret.MoveTo(upperPoint.Value);
return(CommandResult.Executed);
}
break;
case VSConstants.VSStd2KCmdID.LEFT:
case VSConstants.VSStd2KCmdID.LEFT_EXT:
if (curLine.Start == curPoint.Value)
{
if (curLine.LineNumber != 0)
{
// move to the end of the previous line rather then navigating into the prompts
editorOps.MoveLineUp(extend);
window.InteractiveWindow.Operations.End(extend);
}
return(CommandResult.Executed);
}
break;
case VSConstants.VSStd2KCmdID.RIGHT:
case VSConstants.VSStd2KCmdID.RIGHT_EXT:
if (curLine.End == curPoint.Value)
{
if (curLine.LineNumber != curPoint.Value.Snapshot.LineCount - 1)
{
// move to the beginning of the next line rather then navigating into the prompts
editorOps.MoveLineDown(extend);
curPoint = window.TextView.MapDownToBuffer(
window.TextView.Caret.Position.BufferPosition,
window.CurrentLanguageBuffer
);
Debug.Assert(curPoint != null);
var start = curPoint.Value.GetContainingLine().Start;
// Home would be nice here, but it goes to the beginning of the first non-whitespace char
if (extend)
{
VirtualSnapshotPoint anchor = TextView.Selection.AnchorPoint;
TextView.Caret.MoveTo(MapUp(window, start).Value);
TextView.Selection.Select(anchor.TranslateTo(TextView.TextSnapshot), TextView.Caret.Position.VirtualBufferPosition);
}
else
{
window.TextView.Caret.MoveTo(MapUp(window, start).Value);
}
}
return(CommandResult.Executed);
}
break;
}
}
// if we're anywhere outside of the current language buffer then let the normal
// editor behavior continue.
switch ((VSConstants.VSStd2KCmdID)id)
{
case VSConstants.VSStd2KCmdID.UP:
case VSConstants.VSStd2KCmdID.UP_EXT:
editorOps.MoveLineUp(extend);
break;
case VSConstants.VSStd2KCmdID.DOWN:
case VSConstants.VSStd2KCmdID.DOWN_EXT:
editorOps.MoveLineDown(extend);
break;
case VSConstants.VSStd2KCmdID.LEFT:
case VSConstants.VSStd2KCmdID.LEFT_EXT:
editorOps.MoveToPreviousCharacter(extend);
break;
case VSConstants.VSStd2KCmdID.RIGHT:
case VSConstants.VSStd2KCmdID.RIGHT_EXT:
editorOps.MoveToNextCharacter(extend);
break;
}
return(CommandResult.Executed);
}
