About Up-Down Control Styles
Using window styles, you can control characteristics of an up-down control,
such as how it positions itself relative to its buddy window, whether it sets the
text of its buddy window, and whether it processes the UP ARROW and DOWN ARROW a keys.
An up-down control with the UDS_ALIGNLEFT or UDS_ALIGNRIGHT style aligns with
the left or right edge of its buddy window. The width of the buddy window is
decreased to accommodate the width of the up-down control.
An up-down control with the UDS_SETBUDDYINT style sets the caption of its
buddy window (using the
WM_SETTEXT message) whenever the current position changes. The control inserts a
thousands separator between every three digits of a decimal string unless the
UDS_NOTHOUSANDS style is specified. If the buddy window is a list box, an up-down
control sets its current selection instead of its caption.
You can specify the UDS_ARROWKEYS style to provide a keyboard interface for an
up-down control. If this style is specified, the control processes the UP ARROW and DOWN ARROW keys. The control also subclasses the buddy window so that it can process
these keys when the buddy window has the focus.
If you use an up-down control for horizontal scrolling, you can specify the
UDS_HORZ style. This style causes the up-down control's arrows to point left and
right instead of up and down.
By default, the current position does not change if the user attempts to
increment it or decrement it beyond the maximum or minimum value. You can change
this behavior by using the UDS_WRAP style, so the position "wraps" to the opposite
extreme. For example, incrementing past the upper limit wraps the position
back to the lower limit.
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