2006-05-31 Chris Toshok <toshok@ximian.com>

2006-05-31  Chris Toshok  <toshok@ximian.com>

	* DataGridDrawingLogic.cs (FromPixelToColumn): modify this to also
	return (via an out parameter) the starting X of the column.
	(UpdateVisibleColumn): track change to FromPixelToColumn.
	(HitTest): add a ColumnResize case here.
	(DrawResizeLine): new function, probably poorly named.

	* DataGrid.cs (.ctor): get rid of cached_currencymgr_events.  We
	only need to keep one reference.
	(set_ListManager): same.
	(OnMouseDown): call HitTest instead of grid_drawing.HitTest.
	Also, add support for HitTestType.ColumnResize.
	(OnMouseMove): add column resize behavior here, and change the
	cursor to the correct one as we move around the datagrid.
	(OnMouseUp): terminate the column resize if we're resizing.
	(ProcessGridKey): from the MS docs, Alt-0 enters the null value
	for the current cell.
	(ConnectListManagerEvents): use cached_currencymgr.
	(DisconnectListManagerEvents): fill this in, using
	cached_currencymgr.
	(SetCurrentCell): remove cached_currencymgr_events handling.
	(SetDataMember): only call DisconnectListManagerEvents if
	cached_currencymgr is != null.
	(SetDataSource): same.
	(OnListManagerCurrentChanged): cached_currencymgr_events ->
	cached_currencymgr.

svn path=/trunk/mcs/; revision=61350