Handler for wheel up/down events.
| OpenLayers. Handler. MouseWheel | Handler for wheel up/down events. |
| Constructor | |
| OpenLayers. Handler. MouseWheel |
| control | {OpenLayers.Control} |
| callbacks | {Object} An object containing a single function to be called when the drag operation is finished. The callback should expect to recieve a single argument, the point geometry. |
| options | {Object} |