Receiving Toolbar Events (Using Callback and Display)

When a toolbar button is selected, the application is notified through a callback function. The callback function must adhere to the prototype described in TOOLBARCALLBACK. To set the callback function to use for notification, call L_TBSetCallback. To determine which callback function is currently being used, call L_TBGetCallback. The following is an example of processing toolbar events:

/* This example will create a toolbar and set its callback and then use some of
   its buttons messages to display messages to the user */

L_INT EXT_CALLBACK LeadToolbarProc
(
   pTOOLBARHANDLE  pToolbar,
   L_UINT  nButtonID,
   L_UINT32        dwData,
   L_VOID    *pUserData
)
{
switch ( nButtonID )
   {
      case ID_TOOL_PAINT_BRUSH:
         {
            MessageBox ( * ( HWND * ) pUserData, TEXT("BRUSH"), TEXT("Toolbar Message"), MB_OK ) ;
         }

         break ;

      case ID_TOOL_PAINT_SHAPE_LINE:
         {
                        MessageBox ( * ( HWND * ) pUserData, TEXT("LINE"), TEXT("Toolbar Message"), MB_OK ) ;
         }

         break ;

      case ID_TOOL_PAINT_REGION_RECT:
         {
            MessageBox ( * ( HWND * ) pUserData, TEXT("RECT"), TEXT("Toolbar Message"), MB_OK ) ;
         }

         break ;
   }

   return SUCCESS ;
}

/* Global toolbar handle */
pTOOLBARHANDLE g_pLeadToolbar ;

L_INT ToolbarTest ( HWND hWnd )
{
   static HWND hwndToolbarOwner ;

   /* Save the owner window handle */
   hwndToolbarOwner = hWnd ;

   /* Initiate the toolbar handle */
    L_TBInit ( &g_pLeadToolbar ) ;

  if (SUCCESS == L_TBIsValid ( g_pLeadToolbar ) ) /* check the validity of the toolbar handle */
  {
         /* Create the toolbar */
         L_TBCreate ( g_pLeadToolbar, hWnd, TEXT("Tools Window"), TOOLBAR_PAINT ) ;

         /* Show the toolbar */
         L_TBSetVisible ( g_pLeadToolbar, TRUE ) ;

         /* Set the toolbar callback with the owner window as the user defined data */
         L_TBSetCallback ( g_pLeadToolbar, LeadToolbarProc, ( L_VOID  * ) &hwndToolbarOwner ) ;
   }

   return SUCCESS ;
}