splitterpanel OnSplitterPosChanged event
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Aplies to
acSplitterPanel component.  

  TacSplitterPanelSplitterPosChanged = procedure(Sender: TObject; SplitterPos: Integer) of object;  
property OnSplitterPosChanged: TacSplitterPanelSplitterPosChanged;  

The OnSplitterPosChanged event occurs when the value of SplitterPos property changes (in example, when user moves the dividing line between two panes of splitter panel with mouse).  
The SplitterPos parameter determines the current position of divider between panes.  

See also
SplitterPos, SplitterWidth and SplitterStyle properties.