/// <summary>
/// Move the scrollbars to the direction specified by the point specified.
/// Method used by the Mouse multi selection (MouseSelection.cs).
/// Scroll the grid only if the specified location is outside the visible area.
/// </summary>
/// <param name="mousePoint"></param>
public void ScrollOnPoint(Point mousePoint)
{
//Scroll if necesary
Rectangle scrollRect = m_Grid.GetScrollableArea();
//[email protected] : In the below if condition, adding DragOffset value also
// to resolve a defect (when grid is the control which fits into the entire area of screen
// and the form which holds the grid is maximised, Autoscrolling to one or more sides is not possible)
//This reduces the scrollable area and when inside the grid at that time also autoscrolling will be triggered.
if (m_Grid.IsCustomAreaAutoScrollEnabled && !m_Grid.DragSizeRectangle.Contains(mousePoint))
{
scrollRect = new Rectangle(scrollRect.X + m_Grid.DragOffset,
scrollRect.Y + m_Grid.DragOffset,
scrollRect.Width - 2 * m_Grid.DragOffset,
scrollRect.Height - 2 * m_Grid.DragOffset);
}
int?last = LastVisibleScrollableColumn;
if (mousePoint.X > scrollRect.Right && (!last.HasValue ||
last.Value < m_Grid.Columns.Count - 1 || m_Grid.Columns.GetRight(last.Value) > scrollRect.Right))
{
CustomScrollLineRight();
}
last = LastVisibleScrollableRow;
if (mousePoint.Y > scrollRect.Bottom && (!last.HasValue ||
last.Value < m_Grid.Rows.Count - 1 || m_Grid.Rows.GetBottom(last.Value) > scrollRect.Bottom))
{
CustomScrollLineDown();
}
if (mousePoint.X < scrollRect.Left)
{
m_Grid.CustomScrollLineLeft();
}
if (mousePoint.Y < scrollRect.Top)
{
m_Grid.CustomScrollLineUp();
}
}