/// <summary>
/// Handler for ITextView.BringLineIntoViewCompleted event.
/// </summary>
private static void HandleSelectByLineCompleted(object sender, BringLineIntoViewCompletedEventArgs e)
{
TextEditor This;
Invariant.Assert(sender is ITextView);
((ITextView)sender).BringLineIntoViewCompleted -= new BringLineIntoViewCompletedEventHandler(HandleSelectByLineCompleted);
if (e != null && !e.Cancelled && e.Error == null)
{
This = e.UserState as TextEditor;
if (This == null || !This._IsEnabled)
{
return;
}
TextEditorTyping._FlushPendingInputItems(This);
using (This.Selection.DeclareChangeBlock())
{
// Update suggestedX
TextEditorSelection.UpdateSuggestedXOnColumnOrPageBoundary(This, e.NewSuggestedX);
int newComparedToOld = e.NewPosition.CompareTo(e.Position);
if (e.Count < 0) // Moving up if count < 0, moving down otherwise
{
// Shift key is down - Extend the selection edge
if (newComparedToOld < 0 || newComparedToOld == 0 && e.NewPosition.LogicalDirection != e.Position.LogicalDirection)
{
// Note: we compare orientations of equal positions to handle a case
// when original position was at the end of line (after its linebreak with backward orientation)
// as a result of Shift+End selection; and the new position is in the beginning of the next line,
// which is essentially the same position but oriented differently.
// In such a case the new position is good enough to go there.
// We certainly don't want to go to the end of the document in this case.
// We have another line in a given direction; move to it
ExtendSelectionAndBringIntoView(e.NewPosition, This);
}
else
{
// Remember where we were so that we can return if a line down follows.
if (This._NextLineAdvanceMovingPosition == null)
{
This._NextLineAdvanceMovingPosition = e.Position;
This._IsNextLineAdvanceMovingPositionAtDocumentHead = true;
}
// No more lines in this direction. Move to start of current line.
ExtendSelectionAndBringIntoView(GetPositionAtLineStart(e.NewPosition), This);
}
}
else
{
AdjustMovingPositionForSelectDownByLine(This, e.NewPosition, e.Position, e.NewSuggestedX);
}
}
}
}
/// <summary>
/// Fires BringLineIntoViewCompleted event.
/// </summary>
/// <param name="e">Event arguments for the BringLineIntoViewCompleted event.</param>
protected virtual void OnBringLineIntoViewCompleted(BringLineIntoViewCompletedEventArgs e)
{
if (this.BringLineIntoViewCompleted != null)
{
this.BringLineIntoViewCompleted(this, e);
}
}
/// <summary>
/// Handler for ITextView.BringLineIntoViewCompleted event.
/// </summary>
private static void HandleMoveByLineCompleted(object sender, BringLineIntoViewCompletedEventArgs e)
{
Invariant.Assert(sender is ITextView);
((ITextView)sender).BringLineIntoViewCompleted -= new BringLineIntoViewCompletedEventHandler(HandleMoveByLineCompleted);
if (e != null && !e.Cancelled && e.Error == null)
{
TextEditor This = e.UserState as TextEditor;
if (This == null || !This._IsEnabled)
{
return;
}
TextEditorTyping._FlushPendingInputItems(This);
using (This.Selection.DeclareChangeBlock())
{
// Update suggestedX
TextEditorSelection.UpdateSuggestedXOnColumnOrPageBoundary(This, e.NewSuggestedX);
// Move insertion point to next or previous line
This.Selection.SetCaretToPosition(e.NewPosition, e.NewPosition.LogicalDirection, /*allowStopAtLineEnd:*/true, /*allowStopNearSpace:*/true);
}
}
}
