/// <summary>
/// Reverses the change, addition or deletion of a line of text in the page
/// </summary>
/// <param name="changeType"></param>
/// <param name="left"></param>
/// <param name="right"></param>
private void UndoChangeGeneric(DiffChangeMode changeType, int left, int right)
{
if (!txtEdit.Enabled)
return;
try
{
int caretPosition = txtEdit.SelectionStart;
GetDiff(); // to pick up any manual changes from edit box
switch (changeType)
{
case DiffChangeMode.Change:
txtEdit.Text = Diff.UndoChange(left, right);
break;
case DiffChangeMode.Deletion:
txtEdit.Text = Diff.UndoDeletion(left, right);
break;
case DiffChangeMode.Addition:
txtEdit.Text = Diff.UndoAddition(right);
break;
}
GetDiff();
// now put caret back where it was
txtEdit.Select(Math.Min(caretPosition, txtEdit.Text.Length), 0);
txtEdit.ScrollToCaret();
}
catch (Exception ex)
{
ErrorHandler.Handle(ex);
}
}
/// <summary>
/// Reverses the change, addition or deletion of a line of text in the page
/// </summary>
/// <param name="changeType"></param>
/// <param name="left"></param>
/// <param name="right"></param>
private void UndoChangeGeneric(DiffChangeMode changeType, int left, int right)
{
if (!txtEdit.Enabled)
return;
try
{
int caretPosition = txtEdit.SelectionStart;
// see http://stackoverflow.com/questions/1277691/how-to-retrieve-the-scrollbar-position-of-the-webbrowser-control-in-net
int webBrowserYScroll = webBrowser.Document.GetElementsByTagName("HTML")[0].ScrollTop;
GetDiff(); // to pick up any manual changes from edit box
switch (changeType)
{
case DiffChangeMode.Change:
txtEdit.Text = Diff.UndoChange(left, right);
break;
case DiffChangeMode.Deletion:
txtEdit.Text = Diff.UndoDeletion(left, right);
break;
case DiffChangeMode.Addition:
txtEdit.Text = Diff.UndoAddition(right);
break;
}
GetDiff();
// scroll back to where user was
object[] ob = {"window.scrollTo(0, " + webBrowserYScroll.ToString() + @")"};
webBrowser.Document.InvokeScript("eval", ob);
// now put caret back where it was
txtEdit.Select(Math.Min(caretPosition, txtEdit.Text.Length), 0);
txtEdit.ScrollToCaret();
}
catch (Exception ex)
{
ErrorHandler.HandleException(ex);
}
}