检测列表视图中的单击并显示上下文菜单 [英] Detect clicking inside listview and show context menu

问题描述

我有一个作为资源创建的列表视图，并加载到对话框窗口中.我只想在单击列表视图中的项目时才检测并显示上下文菜单.

I have a listview created as a resource and loaded on a dialog window. I want to detect and show a context menu only when items within the listview have been clicked.

 MESSAGE_HANDLER(WM_CONTEXTMENU,OnContextMenu)

        LRESULT OnContextMenu(UINT /*uMsg*/, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
            {
                int iSelected = -1;
    int iFocusGroup = -1;
    iSelected = SendMessage((HWND)wParam, LVM_GETNEXTITEM, -1,LVNI_SELECTED);
    iFocusGroup = ListView_GetFocusedGroup((HWND)wParam);
    if( iSelected != -1 && iFocusGroup == -1) {
                    hPopupMenu = CreatePopupMenu();
                    Insert

Menu(hPopupMenu,  0,     MF_BYCOMMAND | MF_STRING | MF_ENABLED, ID_SHREDTASK_CTXMENU_DELETE, TEXT("Delete"));
                TrackPopupMenu(hPopupMenu, TPM_TOPALIGN | TPM_LEFTALIGN, GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam), 0, m_hWnd, NULL); 
            }
            return 0;
        }

好的，我已经对其进行了编辑，并且可以按照此处的显示方式进行操作，但是问题仍然存在，有人可以向我解释这里的焦点小组有什么问题，以及为什么我在对话框中发送LVM_GETNEXTITEM消息的原因返回！= -1?它不是仅用于Listviews吗?

OK, I've edited this and it works the way it is presented here but the question still stands and can someone explain to me what's the thing with focus group here and why if I send the LVM_GETNEXTITEM message while in the dialog it returns != -1 ? isn't it solely for Listviews ?

这是我根据您的回答制定的另一种选择:

Here is another alternative that I've worked out based on your responses:

LRESULT OnNotifyRClick(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
    {
          switch (uMsg)
        {
            case WM_NOTIFY:
                switch (((LPNMHDR)lParam)->code)
                {
                case NM_RCLICK:
                    if (((LPNMHDR)lParam)->idFrom == IDC_LISTTASKFILES)
                    {                       
                         int iSelected = -1;
                         iSelected = SendMessage(GetDlgItem(IDC_LISTTASKFILES), LVM_GETNEXTITEM, -1,LVNI_SELECTED);

                        if( iSelected != -1 ) {
                            hPopupMenu = CreatePopupMenu();
                            InsertMenu(hPopupMenu,  0,     MF_BYCOMMAND | MF_STRING | MF_ENABLED, ID_SHREDTASK_CTXMENU_DELETE, TEXT("Delete"));
                            TrackPopupMenu(hPopupMenu, TPM_TOPALIGN | TPM_LEFTALIGN, ((CPoint)GetMessagePos()).x, ((CPoint)GetMessagePos()).y, 0, m_hWnd, NULL); 
                        }
                         bHandled = true;

                        return TRUE;
                    }
                    break; 

                break;
                }

        }
          return false;
    }

推荐答案

但是它不能解决整个问题，例如当用户按下键盘上的Windows菜单键时显示上下文菜单.这篇 KB文章显示了如何组合NM_RCLICK和WM_CONTEXTMENU. (这是用于CTreeCtrl的，但是使代码适应CListView是微不足道的.)

But it doesn't solve the whole problem, such as displaying a context menu when user hits the Windows menu key on his keyboard. This KB article shows how to combine NM_RCLICK and WM_CONTEXTMENU. (It's for the CTreeCtrl but adapting the code to CListView is trivial).

这篇关于检测列表视图中的单击并显示上下文菜单的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！