SLS_READONLY creates a read-only slider. This means the user cannot interact with the slider. It is simply used as to present a quantity to the user, such as the percentage of completion of an ongoing task. Visual differences for a read-only slider include a narrow slider arm, no slider buttons, and no detents.
The SLS_RIBBONSTRIP style allows movement of the slider arm to cause the slider shaft between home position and the slider arm to be filled with a color value that is different from the slider shaft color, similar to mercury in a thermometer.
If SLS_OWNERDRAW is specified, the application is notified whenever the slider shaft, the ribbon strip, the slider arm, and the slider background are to be drawn.