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Handles a mouse wheel down movement for the grid control.
Source position: grids.pas line 1037
protected function TCustomGrid.DoMouseWheelDown( |
Shift: TShiftState; |
MousePos: TPoint |
):Boolean; override; |
Shift |
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Shift, Alt, Ctrl modifier for the mouse wheel action. |
MousePos |
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TPoint instance with the coordinates for the mouse pointer. |
True if the mouse wheel operation was handled in the method.
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.
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Sets the mouse wheel behavior for the grid control. |
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Performs actions to apply a mouse wheel message to the grid control. |
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Handles a mouse wheel up movement for the grid control. |
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Signals the OnMouseWheelDown handler. |
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Event handler signalled for a downward movement of the mouse wheel. |
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| Version 4.0 | Generated 2025-05-03 | Home |