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 ; 
}