Overriding the Default Colors Used by PM Controls

There is a way to override the default colors used by PM controls. WinSetControlColors can be used to set one or more control colors. Control colors can be set globally for all instances of the control class (CCF_GLOBAL), or for all instances of the control created on the same thread (CCF_APPLICATION). For example, you can set the background color of all the push buttons in your application to brown without affecting the global default push button background color (normally light-gray). Setting a control color for an individual control window causes the appropriate presentation parameter to be set. Each control has a control color type, and a set of control color indexes are used for each type to provide access to the colors used in the control.

WinQueryControlColors allows an application to query one or more of the colors being used by a PM control. When your application uses this function in conjunction with WinSetControlColors, it can query and then set all of the colors used in a PM system control window at one time. This is more convenient than using presentation parameters, but it is not backwardly compatible with versions earlier than OS/2 Warp Version 4.0.

WM_CTLCOLORCHANGE is sent to a window when a control color has been changed (similar to WM_SYSCOLORCHANGE), and WM_QUERYCTLTYPE can be sent to a window to find out which, if any, control colors it responds to (a control returns a non-zero index value corresponding to a CCT_ constant).

   /******************************************************************/
   /* Query the number of colors used by a push button.              */
   /******************************************************************/

   cCount = WinQueryControlColors(
                 HWND_DESKTOP,             /* Desktop window handle  */
                 CCT_PUSHBUTTON,           /* Select push button     */
                 CCF_COUNTCOLORS,          /* Count number of colors */
                 0, 0);

   pactlColor = (PCTLCOLOR)malloc(sizeof(CTLCOLOR) * cCount);

   /******************************************************************/
   /* Query all the colors used by push buttons in application.      */
   /******************************************************************/

   WinQueryControlColors(HWND_DESKTOP,     /* Desktop window handle  */
                 CCT_PUSHBUTTON,           /* Select push button     */
                 CCF_ALLCOLORS |           /* Return all colors ...  */
                 CCF_APPLICATION,          /* ... for application    */
                 cCount,                   /* Size of array          */
                 pactlColor);              /* Buffer for color data  */

   /******************************************************************/
   /* Give the global push button borders a red color.               */
   /******************************************************************/

   for (i = 0; i < cCount; i++)
   {
       switch (pactlColor[i].clrIndex)
       {
          case CCI_BORDERLIGHT:

             pactlColor[i].clrValue = 0x00FFC0C0;   /* Light red     */
             break;

          case CCI_BORDERDARK:

             pactlColor[i].clrValue = 0x00C00000;   /* Dark red      */
             break;

          default:

             pactlColor[i].clrValue = CCV_DEFAULT;  /* Default color */
             break;
       }
   }

   /******************************************************************/
   /* Set the new border colors for all push buttons in application. */
   /******************************************************************/

   WinSetControlColors(HWND_DESKTOP,       /* Desktop window handle  */
                 CCT_PUSHBUTTON,           /* Select push button     */
                 CCF_APPLICATION,          /* Application colors     */
                 cCount,                   /* Number of colors       */
                 pactlColor);              /* Buffer for color data  */