public override void PerformUndo(ITextBox textbox)
{
if (SelLength > 0)
{
textbox.SetCursorPosition(SelStart);
textbox.InsertRange(SelectedText);
}
else
{
textbox.SetCursorPosition(Position);
textbox.InsertRange(Data);
}
textbox.SelStart = SelStart;
textbox.SelLength = SelLength;
textbox.SetCursorPosition(Position + 1);
base.PerformUndo(textbox);
}
public override void PerformRedo(ITextBox textbox)
{
if (SelLength > 0)
{
textbox.DeleteRange(SelStart, SelLength);
textbox.SelLength = 0;
textbox.SetCursorPosition(Position);
textbox.InsertRange(Data);
textbox.SetCursorPosition(Position + DataLength);
textbox.SelStart = Position + DataLength;
}
else
{
textbox.SetCursorPosition(Position);
textbox.InsertRange(Data);
textbox.SetCursorPosition(Position + DataLength);
textbox.SelStart = Position + DataLength;
textbox.SelLength = 0;
}
base.PerformRedo(textbox);
}
public override void PerformUndo(ITextBox textbox)
{
textbox.DeleteRange(SelStart, DataLength);
if (SelLength > 0)
{
textbox.SetCursorPosition(SelStart);
textbox.InsertRange(SelectedText);
textbox.SelStart = SelStart;
textbox.SelLength = SelLength;
}
else
{
textbox.SetCursorPosition(Position);
textbox.SelStart = Position;
textbox.SelLength = 0;
}
base.PerformUndo(textbox);
}
