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NS_IMETHOD nsIScrollableView::ScrollByLines ( PRInt32  aNumLinesX,
PRInt32  aNumLinexY 
) [pure virtual]

Scroll the view left or right by aNumLinesX columns. Positive values move right. Scroll the view up or down by aNumLinesY lines. Positive values move down. Prevents scrolling off the end of the view.

Parameters:
aNumLinesX number of lines to scroll the view horizontally
aNumLinesY number of lines to scroll the view vertically
Returns:
error status


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