About Trackbars
Trackbars are useful when you want the user to select a discrete value or a
set of consecutive values in a range. For example, you might use a trackbar to
allow the user to set the repeat rate of the keyboard by moving the slider to a
given tick mark.
The slider in a trackbar moves in increments that you specify when you create
it. For example, if you specify that the trackbar should have a range of five,
the slider can only occupy six positions: a position at the left side of the
trackbar and one position for each increment in the range. Typically, each of
these positions is identified by a tick mark.
You create a trackbar by using the
CreateWindowEx function, specifying the TRACKBAR_CLASS window class. Once you have created a
trackbar, you can use trackbar messages to change many of its properties.
Changes that you can make include setting the minimum and maximum positions for the
slider, drawing tick marks, setting a selection range, and repositioning the
slider.
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