Creating a Circular Slider

The circular slider PM window class WC_CIRCULARSLIDER is similar to the window class of a linear slider or a scroll bar. This window class must be registered with WinRegisterCircularSlider before you can create a circular slider. A circular slider can be created by a CONTROL statement in a dialog resource, as shown in the following figure:

CONTROL "~Balance",
        ID_BALANCECS,
        10, 50, 60, 60,
        WC_CIRCULARSLIDER,
        WS_TABSTOP |
        WS_VISIBLE |
        CSS_POINTSELECT

A circular slider also can be created by specifying the WC_CIRCULARSLIDER window class name as a parameter of the WinCreateWindow call, as shown in the following sample code:

hwndCS = WinCreateWindow (hwndClient,           /* Parent handle  */
                          WC_CIRCULARSLIDER,    /* Class name     */
                          "~Balance",           /* Window text    */
                          WS_VISIBLE |
                          WS_TABSTOP |
                          CSS_POINTSELECT,
                          0,0,0,0,              /* Coordinates    */
                          hwndClient,           /* Owner handle   */
                          HWND_TOP,             /* Z-order        */
                          ID_BALANCECS,         /* Window ID      */
                          NULL,                 /* Control data   */
                          NULL);                /* Presparam      */