TCustomGrid.DoMouseWheelUp function
Handles a mouse wheel up movement for the grid control.
Declaration
function DoMouseWheelUp(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
DoMouseWheelUp is an overridden method in
TCustomGrid
called when the mouse wheel is scrolled upward. It calls the inherited method
on entry to signal the
OnMouseWheelUp event handler (when
assigned). The return value is set to
True if the action was handled
in OnMouseWheelUp.
If the action is not handled in OnMouseWheelUp, the GridMouseWheel
method is called to scroll to the previous 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 DoMouseWheelDown for the actions performed when the mouse wheel is scrolled in the downward direction.
DoMouseWheelUp 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.