private int calcColumnOffset(int cursorColumn, int visibleColumns, int documentColumns, int currentLineColumns)
{
int columnOffset;
if (WordWrap)
{
visibleColumns += 1;
columnOffset = Math.Min(0, visibleColumns - 1 - cursorColumn);
int extraColumns = 0;
if (cursorColumn >= visibleColumns - 1)
{
extraColumns = -columnOffset + Math.Max(0, ImportedText.CountSpaces(TypedText.Length) - 1);
}
documentColumns = visibleColumns + extraColumns;
}
else
{
const int visibleColumnsBeforeJumpBack = 6;
int jumpBackZone = Math.Max(1, visibleColumns - (visibleColumns / 2) + 2 - visibleColumnsBeforeJumpBack);
columnOffset = calculateOffset(cursorColumn, visibleColumns, currentLineColumns, jumpBackZone);
}
var horizontalEventArgs = createVisibleRegionChangedEventArgs(columnOffset, visibleColumns, documentColumns);
oldHorizontalEventArgs = Util.RaiseIfEventArgsChanged(OnHorizontalVisibleRegionChanged,
horizontalEventArgs,
oldHorizontalEventArgs);
return(columnOffset);
}