private IHTMLElement GetTargetCell(Point clientPoint)
{
// maximum amount of scanning buffer is based on cell spacing
int maxScanningRange = Math.Max(TableHelper.GetAttributeAsInteger(_table.cellSpacing), 2);
// copy client point so we can modify the x-coordinate while scanning
Point targetPoint = new Point(clientPoint.X, clientPoint.Y);
// if we go past the end of the table allow the cell closest to the cursor
// to become the target cell (necessary for sizing the table larger)
Point xTargetPoint = new Point(targetPoint.X, targetPoint.Y);
IHTMLTableCell targetCell = null;
while (targetCell == null && xTargetPoint.X >= (targetPoint.X - maxScanningRange)) // 0 )
{
// determine the cell we are over
targetCell = _editorContext.ElementFromClientPoint(xTargetPoint) as IHTMLTableCell;
// screen cells that don't belong to us
if (!HTMLElementHelper.ElementsAreEqual(_table as IHTMLElement, TableHelper.GetContainingTableElement(targetCell as IHTMLElement) as IHTMLElement))
{
targetCell = null;
}
xTargetPoint.X--;
}
// if we got a target cell then ensure that the point is over the document area
if (targetCell != null)
{
if (_editorContext.PointIsOverDocumentArea(clientPoint))
{
return(targetCell as IHTMLElement);
}
else
{
return(null);
}
}
else
{
return(null);
}
}
private void HandleMouseMove(TableColumnMouseEventArgs ea)
{
// cell element we are over
IHTMLElement targetCell = GetTargetCell(ea.ClientPoint);
// if there is no element then we are done
if (targetCell == null)
{
// reset state
_sizingOperation.EndSizing();
return;
}
// get the cell and row
IHTMLTableCell cell = targetCell as IHTMLTableCell;
IHTMLTableRow row = TableHelper.GetContainingRowElement(cell);
// convert the client point to cell-local coordinates & calcualte our comparison x values
TableCellEditingElementBehavior cellBehavior = _tableEditingContext.GetCellBehavior(targetCell);
if (cellBehavior == null)
{
_sizingOperation.ClearPending();
return;
}
Point cellLocalMousePt = cellBehavior.TransformGlobalToLocal(ea.ClientPoint);
int cellSpacing = TableHelper.GetAttributeAsInteger(_table.cellSpacing);
int cellSpacingOffset = cellSpacing / 2;
int compareX = cellLocalMousePt.X;
int cellStartX = 0 - cellSpacingOffset;
int cellEndX = targetCell.offsetWidth + cellSpacingOffset;
// if the mouse is near the edge of the cell then update the pending sizing action
// (unless the mouse is near the edge of the first cell where no sizing is supported)
if (MouseNearCellEdge(compareX, cellStartX, cellSpacing) || MouseNearCellEdge(compareX, cellEndX, cellSpacing))
{
if (MouseNearCellEdge(compareX, cellStartX, cellSpacing))
{
if (cell.cellIndex > 0)
{
int leftIndex = cell.cellIndex - 1;
int rightIndex = cell.cellIndex;
_sizingOperation.TrackPending(ea.ClientPoint.X, leftIndex, rightIndex);
ea.Handled = true;
}
else
{
_sizingOperation.ClearPending();
}
}
else if (MouseNearCellEdge(compareX, cellEndX, cellSpacing))
{
int leftIndex = cell.cellIndex;
int rightIndex = cell.cellIndex < (row.cells.length - 1) ? cell.cellIndex + 1 : -1;
_sizingOperation.TrackPending(ea.ClientPoint.X, leftIndex, rightIndex);
ea.Handled = true;
}
}
else // mouse is not near the edge of the cell, reset pending action
{
_sizingOperation.ClearPending();
}
}