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

问题描述

我有一个列表视图作为资源创建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，我已经编辑了它，它按照此处显示的方式工作，但问题仍然存在，有人可以向我解释这里的焦点组有什么问题，以及为什么我在对话框中发送 LVM_GETNEXTITEM 消息返回 != -1 ?不只是针对 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

NM_RCLICK 是你的朋友.

但这并不能解决整个问题，例如当用户点击键盘上的 Windows 菜单键时显示上下文菜单.这篇知识库文章展示了如何组合 NM_RCLICK 和 WM_CONTEXTMENU.(它用于 CTreeCtrl 但将代码调整到 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).

这篇关于检测在列表视图中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！