public override void OnMouseDown(CellContext sender, System.Windows.Forms.MouseEventArgs e)
{
base.OnMouseDown(sender, e);
var pressed = e.Button & MouseButtons;
if (pressed == MouseButtons.None)
{
return;
}
GridVirtual grid = sender.Grid;
//Check the control and shift key status
bool controlPress = ((Control.ModifierKeys & Keys.Control) == Keys.Control &&
(grid.SpecialKeys & GridSpecialKeys.Control) == GridSpecialKeys.Control);
bool shiftPress = ((Control.ModifierKeys & Keys.Shift) == Keys.Shift &&
(grid.SpecialKeys & GridSpecialKeys.Shift) == GridSpecialKeys.Shift);
//Default click handler
if (shiftPress == false ||
grid.Selection.EnableMultiSelection == false)
{
//Handle Control key
bool mantainSelection = grid.Selection.EnableMultiSelection && controlPress;
//If the cell is already selected and the user has the ctrl key pressed then deselect the cell
// AlanP: Sep 2013. Changed the equality test for the active row to be row based rather than actual position
if (controlPress && grid.Selection.IsSelectedCell(sender.Position) && grid.Selection.ActivePosition.Row != sender.Position.Row)
{
grid.Selection.SelectCell(sender.Position, false);
}
else
{
grid.Selection.Focus(sender.Position, !mantainSelection);
}
}
else //handle shift key
{
grid.Selection.ResetSelection(true);
Range rangeToSelect = new Range(grid.Selection.ActivePosition, sender.Position);
grid.Selection.SelectRange(rangeToSelect, true);
}
// begin scroll tracking only if mouse was clicked
// in scrollable area
Rectangle scrollRect = grid.GetScrollableArea();
if (scrollRect.Contains(e.Location))
{
BeginScrollTracking(grid);
}
}
/// <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();
}
}