WS_TABSTOP 在 winapi 中编辑子控件 windows

Question

在我的 WinAPI 应用程序中，我在子 window 中有一系列编辑控件。我希望用户能够通过按 tab 键前进和 shift-tab 返回来在它们之间移动，但我似乎无法弄清楚如何使用 WS_TABSTOP 和 child windows。我想要发生的是，当用户单击 tab 键时，将选择随后的编辑控件。但是，当我单击以下代码的 window 中的选项卡时，光标就消失了。

这是一个最小的可重现示例：

    //libraries
#pragma comment ("lib", "Comctl32.lib")
#pragma comment ("lib", "d2d1.lib")


#define WIN32_LEAN_AND_MEAN             // Exclude rarely-used stuff from Windows headers
// Windows Header Files
#include <windows.h>
#include <CommCtrl.h>
// C RunTime Header Files

#include <vector>
#include <string>


#define IDS_APP_TITLE           103
#define IDI_PRACTICE            107
#define IDI_SMALL               108
#define IDC_PRACTICE            109

#define MAX_LOADSTRING          100

// Global Variables:
HINSTANCE hInst;                                // current instance
WCHAR szTitle[MAX_LOADSTRING];                  // The title bar text
WCHAR szWindowClass[MAX_LOADSTRING];            // the main window class name

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
LRESULT CALLBACK WndProcChild(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);

ATOM MyRegisterClass(HINSTANCE hInstance);

HWND childHWND;

HWND InitInstance(HINSTANCE hInstance, int nCmdShow);

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
    _In_opt_ HINSTANCE hPrevInstance,
    _In_ LPWSTR    lpCmdLine,
    _In_ int       nCmdShow)
{
    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);
    // Initialize global strings
    LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    LoadStringW(hInstance, IDC_PRACTICE, szWindowClass, MAX_LOADSTRING);
    MyRegisterClass(hInstance);

    SetProcessDpiAwarenessContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);

    // Perform application initialization:
    HWND hWnd = InitInstance(hInstance, nCmdShow);
    if(!hWnd)
    {
        return FALSE;
    }
    HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_PRACTICE));
    MSG msg;
    // Main message loop:
    while (GetMessage(&msg, nullptr, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            if (!IsDialogMessage(hWnd, &msg))
            {
                TranslateMessage(&msg);
                DispatchMessage(&msg);
            }
        }
    }
    return (int)msg.wParam;
}


LRESULT CALLBACK WndProcChild(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_CREATE:
    {
        HWND edit1 = CreateWindow(WC_EDIT, L"", WS_CHILD | WS_BORDER | WS_VISIBLE | WS_TABSTOP, 100, 100, 100, 100, hWnd, (HMENU)1, hInst, NULL);
        HWND edit2 = CreateWindow(WC_EDIT, L"", WS_CHILD | WS_BORDER | WS_VISIBLE | WS_TABSTOP, 300, 100, 100, 100, hWnd, (HMENU)2, hInst, NULL);
        break;
    }
    }
    return DefWindowProc(hWnd, message, wParam, lParam);
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;

}

ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEXW wcex;
    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc = WndProc;
    wcex.cbClsExtra = 0;
    wcex.cbWndExtra = 0;
    wcex.hInstance = hInstance;
    wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_PRACTICE));
    wcex.hCursor = LoadCursor(nullptr, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)(GetStockObject(WHITE_BRUSH));
    wcex.lpszMenuName = MAKEINTRESOURCEW(IDC_PRACTICE);
    wcex.lpszClassName = L"Parent";
    wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));


    //Child wnd class
    WNDCLASSEXW wcexChild;
    wcexChild.cbSize = sizeof(WNDCLASSEX);
    wcexChild.style = CS_HREDRAW | CS_VREDRAW;
    wcexChild.lpfnWndProc = WndProcChild;
    wcexChild.cbClsExtra = 0;
    wcexChild.cbWndExtra = 0;
    wcexChild.hInstance = hInstance;
    wcexChild.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_PRACTICE));
    wcexChild.hCursor = LoadCursor(nullptr, IDC_ARROW);
    wcexChild.hbrBackground = (HBRUSH)(GetStockObject(WHITE_BRUSH));
    wcexChild.lpszMenuName = MAKEINTRESOURCEW(IDC_PRACTICE);
    wcexChild.lpszClassName = L"Child";
    wcexChild.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
    return RegisterClassExW(&wcexChild) && RegisterClassExW(&wcex);
}


HWND InitInstance(HINSTANCE hInstance, int nCmdShow)
{
    hInst = hInstance; // Store instance handle in our global variable
    HWND hWnd = CreateWindowW(L"Parent", L"PARENT", WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, nullptr, nullptr, hInstance, nullptr);

    childHWND = CreateWindowW(L"Child", L"", WS_CHILD | WS_VISIBLE | WS_EX_CONTROLPARENT,
        0, 0, 700, 700, hWnd, nullptr, hInstance, nullptr);

    if (!hWnd)
    {
        return NULL;
    }
    ShowWindow(childHWND, nCmdShow);
    UpdateWindow(childHWND);

    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);
    return hWnd;
}

Answer 1

这里的问题是 if (!IsDialogMessage(hWnd, &msg)) 被错误地调用 window。

将行替换为 if (!IsDialogMessage(childHWND, &msg)) 可使 TAB 导航正常工作。

来自 IsDialogMessage 文档：

Although the IsDialogMessage function is intended for modeless dialog boxes, you can use it with any window that contains controls, enabling the windows to provide the same keyboard selection as is used in a dialog box.

在发布的代码中，“包含控件的window”是编辑控件的直接父级，即childHWND。

[ EDIT ] 评论中指出的另一个问题（感谢 @IInspectable）是扩展样式 WS_EX_CONTROLPARENT 被错误地与样式一起传递标志，而不是 extended 样式标志。要解决此问题，对 childHWND = CreateWindowW(L"Child", L"", WS_CHILD | WS_VISIBLE | WS_EX_CONTROLPARENT, ... 的调用应更改为 childHWND = CreateWindowExW(WS_EX_CONTROLPARENT, L"Child", L"", WS_CHILD | WS_VISIBLE, ...。

WS_TABSTOP 在 winapi 中编辑子控件 windows

WS_TABSTOP in winapi on edit controls of child windows

c++

windows

winapi

tabstop