在具有可编辑子项的列表视图中正确处理子项编辑（或取消子项编辑）

Question

简介：

我正在尝试使用可编辑子项来实现列表视图控件。对于项目/子项目的就地编辑，我使用编辑控件。

我相信我已经成功地对将编辑控件放置在项目/子项目上方进行了正确的编码。

问题：

我不知道在哪些事件上我应该结束/取消子项目编辑（隐藏编辑控件、设置子项目文本等）以及应该如何做。

为了澄清，我谈到用户完成/取消就地编辑的那一刻。

此时不再需要编辑控件，所以我应该隐藏它（我不喜欢每次都重新创建它；我相信创建一次然后在需要时显示/隐藏它会更有效）。

我的目标是 Visual Studio 中 Properties 窗口的行为（请参阅附图以准确查看我引用的窗口）。

我想以与用户按 ESC 键/单击另一个窗口/单击滚动条等时此窗口相同的方式实现编辑/取消。

我为解决这个问题所做的努力：

使用谷歌，我找到了一些例子，但它们很旧，并且不能解决所有相关案例，所以这就是我在这里寻求帮助的原因。

但是，我发现我必须考虑的事件之一是

EN_KILLFOCUS

，用户按下 ESC/ENTER 键的情况以及用户单击编辑控件以外的其他内容时的情况。

编辑：

我已经成功处理了 ESC 和 ENTER 键，以及用户单击另一个同级控件或使用 ALT + TAB 切换窗口的情况。我已经更新了 SSCCE 并进行了相关更改

问题：

为了实现网格的默认行为（如果有用于 Windows 应用程序的默认行为），我必须处理哪些消息/事件？

您还可以指出我应该在哪里编辑子项并隐藏编辑控件，以及我应该在哪里隐藏编辑控件吗？

编辑：

我剩下的唯一问题是处理用户单击列表视图滚动条或主窗口背景时的情况。我只是不知道如何处理这个问题，非常感谢我能得到的所有帮助。

相关信息：

我在 Windows 7 x86 上使用 Visual Studio 2013；

我正在使用原始 WinAPI 在 C++ 中进行开发；

SSCCE：

以下是我迄今为止的解决方案。我已尝试对其进行彻底评论，但如果需要更多信息，请发表评论，我将更新我的帖子。

#include <windows.h>
#include <windowsx.h>   // various listview macros etc
#include <CommCtrl.h>
#include <stdio.h>      // swprintf_s()

// enable Visual Styles
#pragma comment( linker, "/manifestdependency:\"type='win32' \
                         name='Microsoft.Windows.Common-Controls' version='6.0.0.0' \
                         processorArchitecture='*' publicKeyToken='6595b64144ccf1df' \
                         language='*'\"")

// link with Common Controls library
#pragma comment( lib, "comctl32.lib") 

//global variables
HINSTANCE hInst;

// listview subclass procedure
LRESULT CALLBACK ListViewSubclassProc(HWND hwnd, UINT message, 
    WPARAM wParam, LPARAM lParam,
    UINT_PTR uIdSubclass, DWORD_PTR dwRefData)
{
    switch (message)
    {
    case WM_VSCROLL:
    case WM_HSCROLL:
        // if edit control has the focus take it away and give to listview
        if (GetFocus() == GetDlgItem(GetParent(hwnd), 5000))
            SetFocus(hwnd);  // use WM_NEXTDLGCTL for dialogbox !!!!
        break;
    case WM_NCDESTROY:
        ::RemoveWindowSubclass(hwnd, ListViewSubclassProc, uIdSubclass);
        return DefSubclassProc(hwnd, message, wParam, lParam);
    }
    return ::DefSubclassProc(hwnd, message, wParam, lParam);
}

// subclass procedure for edit control
LRESULT CALLBACK InPlaceEditControl_SubclassProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam,
    UINT_PTR uIdSubclass, DWORD_PTR dwRefData)
{
    switch (message)
    {
    case WM_GETDLGCODE:
        return (DLGC_WANTALLKEYS | DefSubclassProc(hwnd, message, wParam, lParam));
    case WM_KILLFOCUS:
        ShowWindow(hwnd, SW_HIDE);
        return DefSubclassProc(hwnd, message, wParam, lParam);
    case WM_CHAR:
        //Process this message to avoid message beeps.
        switch (wParam)
        {
        case VK_RETURN:
            return 0L;
        case VK_ESCAPE:
            return 0L;
        default:
            return ::DefSubclassProc(hwnd, message, wParam, lParam);
        }
        break;
    case WM_KEYDOWN:
        switch (wParam)
        {
        case VK_RETURN:
        {
            // get listview handle
            HWND hwndLV = GetDlgItem(GetParent(hwnd), 2000);
            // get edit control's client rectangle
            RECT rc = { 0 };
            GetClientRect(hwnd, &rc);
            // since edit control lies inside item rectangle
            // we can test any coordinate inside edit control's
            // client rectangle
            // I chose ( rc.left, rc.top )
            MapWindowPoints(hwnd, hwndLV, (LPPOINT)&rc, (sizeof(RECT) / sizeof(POINT)));
            // get item and subitem indexes
            LVHITTESTINFO lvhti = { 0 };
            lvhti.pt.x = rc.left;
            lvhti.pt.y = rc.top;
            ListView_SubItemHitTest(hwndLV, &lvhti);
            // get edit control's text
            wchar_t txt[50] = L"";
            Edit_GetText(hwnd, txt, 50);
            // edit cell text
            ListView_SetItemText(hwndLV, lvhti.iItem, lvhti.iSubItem, txt);
            // restore focus to listview
            // this triggers EN_KILLFOCUS
            // which will hide edit control
            SetFocus(hwndLV);
        }
            return 0L;
        case VK_ESCAPE:
            SetFocus(GetDlgItem(GetParent(hwnd), 2000));
            return 0L;
        default:
            return ::DefSubclassProc(hwnd, message, wParam, lParam);
        }
        break;
    case WM_NCDESTROY:
        ::RemoveWindowSubclass(hwnd, InPlaceEditControl_SubclassProc, uIdSubclass);
        return DefSubclassProc(hwnd, message, wParam, lParam);

    }
    return ::DefSubclassProc(hwnd, message, wParam, lParam);
}
// main window procedure
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch (msg)
    {
    case WM_CREATE:
    {
        //================ create controls
        RECT rec = { 0 };
        GetClientRect(hwnd, &rec);

        HWND hwndLV = CreateWindowEx(0, WC_LISTVIEW,
            L"", WS_CHILD | WS_VISIBLE | WS_BORDER | WS_CLIPSIBLINGS | LVS_REPORT, 
            50, 50, 250, 200, hwnd, (HMENU)2000, hInst, 0);
        // in place edit control
        HWND hwndEdit = CreateWindowEx(0, WC_EDIT, L"", ES_AUTOHSCROLL | WS_CHILD | WS_BORDER,
            200, 265, 100, 25, hwnd, (HMENU)5000, hInst, 0);
        // edit control must have the same font as listview
        HFONT hf = (HFONT)SendMessage(hwndLV, WM_GETFONT, 0, 0);
        if (hf)
            SendMessage(hwndEdit, WM_SETFONT, (WPARAM)hf, (LPARAM)TRUE);
        // subclass edit control, so we can edit subitem with ENTER, or
        // cancel editing with ESC
        SetWindowSubclass(hwndEdit, InPlaceEditControl_SubclassProc, 0, 0);
        // set extended listview styles
        ListView_SetExtendedListViewStyle(hwndLV, LVS_EX_FULLROWSELECT | LVS_EX_GRIDLINES | LVS_EX_DOUBLEBUFFER);
        // subclass listview
        SetWindowSubclass(hwndLV, ListViewSubclassProc, 0, 0);

        // add some columns
        LVCOLUMN lvc = { 0 };

        lvc.mask = LVCF_FMT | LVCF_WIDTH | LVCF_TEXT | LVCF_SUBITEM;
        lvc.fmt = LVCFMT_LEFT;

        for (long nIndex = 0; nIndex < 5; nIndex++)
        {
            wchar_t txt[50];
            swprintf_s(txt, 50, L"Column %d", nIndex);

            lvc.iSubItem = nIndex;
            lvc.cx = 60;
            lvc.pszText = txt;

            ListView_InsertColumn(hwndLV, nIndex, &lvc);
        }

        // add some items
        LVITEM lvi;

        lvi.mask = LVIF_TEXT;

        for (lvi.iItem = 0; lvi.iItem < 10000; lvi.iItem++)
        {
            for (long nIndex = 0; nIndex < 5; nIndex++)
            {
                wchar_t txt[50];
                swprintf_s(txt, 50, L"Item %d%d", lvi.iItem, nIndex);

                lvi.iSubItem = nIndex;
                lvi.pszText = txt;

                if (!nIndex)  // item 
                    SendDlgItemMessage(hwnd, 2000, LVM_INSERTITEM, 0, reinterpret_cast<LPARAM>(&lvi));
                else          // sub-item
                    SendDlgItemMessage(hwnd, 2000, LVM_SETITEM, 0, reinterpret_cast<LPARAM>(&lvi));
            }
        }
    }
        return 0L;
    case WM_NOTIFY:
    {
        if (((LPNMHDR)lParam)->code == NM_DBLCLK)  
        {
            switch (((LPNMHDR)lParam)->idFrom)
            {
            case 2000: // remember, this was our listview's ID
            {
                LPNMITEMACTIVATE lpnmia = (LPNMITEMACTIVATE)lParam;

                // SHIFT/ALT/CTRL/their combination, must not be pressed
                if ((lpnmia->uKeyFlags || 0) == 0)
                {
                    // store item/subitem rectangle
                    RECT rc = { 0, 0, 0, 0 };
                    // helper values, needed for handling partially visible items
                    int topIndex = ListView_GetTopIndex(lpnmia->hdr.hwndFrom);
                    int visibleCount = ListView_GetCountPerPage(lpnmia->hdr.hwndFrom);
                    // if item is vertically partially visible, make it fully visible
                    if ((topIndex + visibleCount) == lpnmia->iItem)
                    {
                        // get the rectangle of the above item -> lpnmia->iItem - 1
                        ListView_GetSubItemRect(lpnmia->hdr.hwndFrom, lpnmia->iItem - 1, lpnmia->iSubItem, LVIR_LABEL, &rc);
                        // ensure clicked item is visible
                        ListView_EnsureVisible(lpnmia->hdr.hwndFrom, lpnmia->iItem, FALSE);
                    }
                    else // item is fully visible, just get its ectangle
                        ListView_GetSubItemRect(lpnmia->hdr.hwndFrom, lpnmia->iItem, lpnmia->iSubItem, LVIR_LABEL, &rc);

                    RECT rcClient = { 0 };  // listview client rectangle, needed if item partially visible
                    GetClientRect(lpnmia->hdr.hwndFrom, &rcClient);
                    // item is horizontally partially visible -> from the right side
                    if (rcClient.right < rc.right)  
                    {
                        // show the whole item
                        ListView_Scroll(lpnmia->hdr.hwndFrom, rc.right - rcClient.right, 0);
                        // adjust rectangle so edit control is properly displayed
                        rc.left -= rc.right - rcClient.right;
                        rc.right = rcClient.right;
                    }
                    // item is horizontally partially visible -> from the left side
                    if (rcClient.left > rc.left)  
                    {
                        // show the whole item
                        ListView_Scroll(lpnmia->hdr.hwndFrom, rc.left - rcClient.left, 0);
                        // adjust rectangle so edit control is properly displayed
                        rc.right += rcClient.left - rc.left;
                        rc.left = rcClient.left;
                    }
                    // it is time to position edit control, we start by getting its window handle
                    HWND hwndEdit = GetDlgItem(hwnd, 5000);
                    //  get item text and set it as edit control's text
                    wchar_t text[51];
                    ListView_GetItemText(lpnmia->hdr.hwndFrom, lpnmia->iItem, lpnmia->iSubItem, text, 50);
                    Edit_SetText(hwndEdit, text);
                    // select entire text
                    Edit_SetSel(hwndEdit, 0, -1);
                    // map listview client rectangle to parent rectangle
                    // so edit control can be properly placed above the item
                    MapWindowPoints(lpnmia->hdr.hwndFrom, hwnd, (LPPOINT)&rc, (sizeof(RECT) / sizeof(POINT)));
                    // move the edit control
                    SetWindowPos(hwndEdit, HWND_TOP, rc.left, rc.top, rc.right - rc.left, 
                        rc.bottom - rc.top, SWP_SHOWWINDOW);
                    // set focus to our edit control
                    HWND previousWnd = SetFocus(hwndEdit);
                }
            }
                break;
            default:
                break;
            }
        }
    }
        break;
    case WM_CLOSE:
        ::DestroyWindow(hwnd);
        return 0L;
    case WM_DESTROY:
    {
        ::PostQuitMessage(0);
    }
        return 0L;
    default:
        return ::DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}

// WinMain
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine,
    int nCmdShow)
{
    // store hInstance in global variable for later use
    hInst = hInstance;

    WNDCLASSEX wc;
    HWND hwnd;
    MSG Msg;

    // register main window class
    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = 0;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInst;
    wc.hIcon = LoadIcon(hInstance, IDI_APPLICATION);
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = GetSysColorBrush(COLOR_WINDOW);
    wc.lpszMenuName = NULL;
    wc.lpszClassName = L"Main_Window";
    wc.hIconSm = LoadIcon(hInstance, IDI_APPLICATION);

    if (!RegisterClassEx(&wc))
    {
        MessageBox(NULL, L"Window Registration Failed!", L"Error!", 
            MB_ICONEXCLAMATION | MB_OK);

        return 0;
    }

    // initialize common controls
    INITCOMMONCONTROLSEX iccex;
    iccex.dwSize = sizeof(INITCOMMONCONTROLSEX);
    iccex.dwICC = ICC_LISTVIEW_CLASSES | ICC_STANDARD_CLASSES;
    InitCommonControlsEx(&iccex);

    // create main window
    hwnd = CreateWindowEx(0, L"Main_Window", L"Grid control",
        WS_OVERLAPPEDWINDOW, 50, 50, 400, 400, NULL, NULL, hInstance, 0);

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    while (GetMessage(&Msg, NULL, 0, 0) > 0)
    {
        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
    }
    return Msg.wParam;
}

Answer 1

更新：

转念一想，我之前发的方法是错误的。我认为在编辑框中使用

SetCapture

是设计错误，它会干扰很多其他事情。我要删除我的旧答案并假装没人看到它！

你自己的方法可以检查

KILLFOCUS

，你只需要ListView的子类来检查滚动消息来模仿

LVN_XXXLABELEDIT

void hideEdit(BOOL save)
{
    //save or not...
    ShowWindow(hedit, SW_HIDE);
}

LRESULT CALLBACK EditProc...
{
    if (msg == WM_KILLFOCUS)
        hideEdit(1);

    if (msg == WM_CHAR)
    {
        if (wParam == VK_ESCAPE){
            hideEdit(0);
            return 0;
        }
        if (wParam == VK_RETURN){
            hideEdit(1);
            return 0;
        }
    }

    return DefSubclassProc(...);
}

LRESULT CALLBACK ListProc...
{
    if (msg == WM_VSCROLL || msg == WM_HSCROLL) hideEdit(1);
    return DefSubclassProc(...);
}

Answer 2

对SSCCE的AlwaysLearningNewStuff答案的补充：

从

LVS_EX_FULLROWSELECT

 获取 

lpnmia->iItem

 时，

listview 必须具有

LPNMITEMACTIVATE lpnmia = (LPNMITEMACTIVATE)lParam;

扩展样式，否则

lpnmia->iItem

始终为 -1。

如果您不想要

LVS_EX_FULLROWSELECT

，您可以：

LVHITTESTINFO itemclicked;
itemclicked.pt.x = lpnmia->ptAction.x;
itemclicked.pt.y = lpnmia->ptAction.y;
int lResult = ListView_SubItemHitTest(lpnmia->hdr.hwndFrom, &itemclicked);
if ( lResult != -1 ) {
    lpnmia->iItem = itemclicked.iItem;
    lpnmia->iSubItem = itemclicked.iSubItem;
}