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  • showing tooltip on controls (description on TTN_NEEDTEXT)

      Before   the   tool   tip   is   displayed,   the   TTN_NEEDTEXT   notification   message   is   sent   to   the   owner   window   of   the   toolbar   to   retrieve   the   descriptive   text   for   the   button.   If   the   owner   window   of   the   toolbaris   a   CFrameWnd   window,   tool   tips   are   displayed   wihout   any   extra   effort,   because   CFrameWnd   has   a   default   handler   for   the   TTN_NEEDTEXT   notification.   If   the   owner   window   of   the   toolbaris   not   derived   from   CFrameWnd,   such   as   a   dialog   box   or   form   view,   you   must   add   an   entry   to   the   message   map   of   your   owner   window   and   provide   a   notification   handler   in   the   message   map.   The   entry   to   the   message   map   of   your   owner   window   is   as   follows:  
       
      ON_NOTIFY_EX(   TTN_NEEDTEXT,   0,   memberFxn   )  
      memberFxn    
      The   method   to   be   called   when   text   is   needed   for   this   button.    
      Note   that   the   id   of   a   tool   tip   is   always   0.  
       
      In   addition   to   the   TTN_NEEDTEXT   notification,   a   tool   tip   control   can   send   the   following   notifications   to   a   toolbar   control:  
       
      Notification   Meaning    
      TTN_NEEDTEXTA   Tool   tip   control   requires   ASCII   text   (Win95   only).    
      TTN_NEEDTEXTW   Tool   tip   control   requires   UNICODE   text   (Windows   NT   only).    
      TBN_HOTITEMCHANGE     Indicates   that   the   hot   (highlighted)   item   has   changed.    
      NM_RCLICK   Indicates   the   user   has   right-clicked   a   button.    
      TBN_DRAGOUT     Indicates   the   user   has   clicked   the   button   and   dragged   the   pointer   off   the   button.   It   allows   an   application   to   implement   drag   and   drop   from   a   toolbar   button.   When   receiving   this   notification,   the   application   will   begin   the   drag   and   drop   operation.      
      TBN_DROPDOWN     Indicates   the   user   has   clicked   a   button   that   uses   the   TBSTYLE_DROPDOWN   style.    
      TBN_GETOBJECT     Indicates   the   user   moved   the   pointer   over   a   button   ithat   uses   the   TBSTYLE_DROPPABLE   style.   The   message.     
     
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  • 原文地址:https://www.cnblogs.com/cy163/p/556070.html
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