By default, the OLEDropMode property is exOLEDropNone. Curently, the control supports only manual OLE Drag and Drop operation. Use the SelectByDrag property to disable selecting multiple items by dragging. The SingleSel property controls the number of items that the user may select. For instance, if the SingleSel property is True, the user can't select multiple items, and so a single item may be selected at the time. If the SingleSel property is False, the user can select multiple items using the mouse, keyboard or both.
The control provides the following options to define the visual effect when drag and drop items:- Background(exDragDropBefore), Specifies the visual appearance for the drag and drop cursor before showing the items. This option can be used to apply a background to the dragging items, before painting the items. By default, the control doesn't draw any background for the items being dragged. For instance, use the Background(exDragDropBefore) = SelBackColor property to specify the same background color/skin for items being dragged as they are selected.
- Background(exDragDropAfter), Specifies the visual appearance for the drag and drop cursor after showing the items. This option can be used to apply a semi-transparent/opaque background to the dragging items, after painting the items. Use this option to apply a transparent/opaque skin, after the items are painted. For instance, using an color or an opaque skin you can show something else when dragging the items.
- Background(exDragDropListTop), Specifies the graphic feedback of the item from the drag and drop cursor if the cursor is in the top half of the row. Use this option to indicate the graphic to be displayed on the item, when the cursor is in the top half row. By default, nothing is displayed.
- Background(exDragDropListBottom), Specifies the graphic feedback of the item from the drag and drop cursor if the cursor is in the bottom half of the row. Use this option to indicate the graphic to be displayed on the item, when the cursor is in the bottom half row. By default, nothing is displayed. Use the HitTestInfoEnum.exHTBottomHalf flag to check whether the user drags the items in the top half or bottom half of the row.
- Background(exDragDropForeColor), Specifies the foreground color for the items being dragged. By default, the foreground color is black.
See the OLEStartDrag and OLEDragDrop events for more details about implementing drag and drop operations into the ExGrid control.