TCustomGrid.DoMouseWheelDown function
Handles a mouse wheel down movement for the grid control.
Declaration
function DoMouseWheelDown(Shift: TShiftState; MousePos: TPoint)
: Boolean; overrideArguments
Shift | Shift, Alt, Ctrl modifier for the mouse wheel action. |
MousePos | TPoint instance with the coordinates for the mouse pointer. |
Function result
True if the mouse wheel operation was handled in the method.Description
DoMouseWheelDown is a an overridden method in
TCustomGrid called when the mouse wheel is scrolled downward. It
calls the inherited method on entry to signal the
OnMouseWheelDown
event handler (when assigned). The return value is set to
True if the
action was handled in OnMouseWheelDown.
If the action is not handled in OnMouseWheelDown, the
GridMouseWheel method is called to scroll to the next selectable
area in the control using the specified Shift modifier. When Shift
contains ssCtrl (Ctrl key), the horizontal position is updated
instead of the vertical. The return value is set to True when the
action is handled in this manner.
Use MouseWheelOption to specify whether mouse wheel operations are
applied to the grid cursor (selection / editing) or the visible area for the
control.
See DoMouseWheelUp for the actions performed when the mouse wheel is scrolled in the upward direction.
DoMouseWheelDown is called from the inherited DoMouseWheel method when an OnMouseWheel event handler was not found, or it did not handle the notification.
See also
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.