c++ - 列表框通知

Question

我有两个控件的对话框: TreeView 和列表框。我的对话框也有消息处理程序。

 case WM_NOTIFY:
        {  
          switch(LOWORD(wParam)) 
            {
                case IDC_LIST1: //we NEVER comes here
                      if(((LPNMHDR)lParam)->code == NM_CLICK)
                      {
                          //do some work; 
                          return (INT_PTR)TRUE; 
                      }
                      break; 
                case IDC_TREE1: 
                      if(((LPNMHDR)lParam)->code == NM_DBLCLK)
                      {
                         //do some work;
                         return (INT_PTR)TRUE;  
                      }
                      break;
            }
        }
        break;

所以，我不明白为什么来自树框的通知成功到达，但是来自列表框的通知永远不会到达，尽管在列表框控件的属性中设置了 Notify 值 <强>正确 。谢谢你。

Answer 1

让我们检查文档。

List Box Styles :

LBS_NOTIFY

Causes the list box to send a notification code to the parent window whenever the user clicks a list box item (LBN_SELCHANGE), double-clicks an item (LBN_DBLCLK), or cancels the selection (LBN_SELCANCEL).

LBN_SELCHANGE :

Notifies the application that the selection in a list box has changed as a result of user input. The parent window of the list box receives this notification code through the WM_COMMAND message.

LBN_DBLCLK :

Notifies the application that the user has double-clicked an item in a list box. The parent window of the list box receives this notification code through the WM_COMMAND message.

LBN_SELCANCEL :

Notifies the application that the user has canceled the selection in a list box. The parent window of the list box receives this notification code through the WM_COMMAND message.

结论:列表框使用WM_COMMAND通知父级，而不是WM_NOTIFY。