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Scrolling Text with the WM_CREATE Message
Scrolling units are typically set while processing the WM_CREATE message. It is convenient to base the scrolling units on the dimensions of
the font associated with the window's display context (DC). To retrieve the font
dimensions for a specific DC, use the GetTextMetrics function.
In the example in Example of Scrolling Text, one vertical scrolling unit is equivalent to the height of a character cell,
plus external leading. One horizontal scrolling unit is equivalent to the
average width of a character cell. The horizontal scrolling positions, therefore,
do not correspond to actual characters, unless the screen font is fixed-width.
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