控件–ReBarWindow32

使用WindowsAPI，创建ReBarWindow32控件：

#include <windows.h>
#include <commctrl.h>

#pragma comment(lib, "comctl32.lib")

#define NUMBUTTONS 3
#define ID_TOOLBAR 201
#define ID_COMBOBOX 202
#define ID_REBAR 203
HINSTANCE g_hInst;

// 函数声明
HWND CreateRebar(HWND hwndOwner, HWND hwndToolbar, HWND hwndCombo);
HWND hwndCombo;
LRESULT CALLBACK WindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
    switch (message) {
    case WM_CREATE: {
        // 创建工具条
        HWND hwndToolbar = CreateToolbarEx(hwnd, WS_CHILD | WS_VISIBLE | TBSTYLE_TOOLTIPS,
            ID_TOOLBAR, 0, NULL, 0, NULL, 0,
            0, 0, 0, 0, sizeof(TBBUTTON));

        // 添加按钮到工具条
        TBBUTTON tbb[NUMBUTTONS];
        for (int i = 0; i < NUMBUTTONS; ++i) {
            tbb[i].iBitmap = -1; // 不使用图标
            tbb[i].idCommand = 1000 + i; // 按钮 ID
            tbb[i].fsState = TBSTATE_ENABLED;
            tbb[i].fsStyle = TBSTYLE_BUTTON;
            tbb[i].dwData = 0;
            tbb[i].iString = (INT_PTR)L"Button"; // 按钮文本
        }

        SendMessage(hwndToolbar, TB_BUTTONSTRUCTSIZE, (WPARAM)sizeof(TBBUTTON), 0);
        SendMessage(hwndToolbar, TB_ADDBUTTONS, NUMBUTTONS, (LPARAM)&tbb);
        SendMessage(hwndToolbar, TB_AUTOSIZE, 0, 0);

        // 创建组合框
        hwndCombo = CreateWindowEx(0, WC_COMBOBOX, NULL,
            WS_CHILD | WS_VISIBLE | CBS_DROPDOWN | CBS_HASSTRINGS,
            150, 0, 200, 200, hwnd, (HMENU)ID_COMBOBOX, g_hInst, NULL);

        // 添加项到组合框
        SendMessage(hwndCombo, CB_ADDSTRING, 0, (LPARAM)L"Option 1");
        SendMessage(hwndCombo, CB_ADDSTRING, 0, (LPARAM)L"Option 2");
        SendMessage(hwndCombo, CB_ADDSTRING, 0, (LPARAM)L"Option 3");
        // 创建重条控件
        HWND hwndRebar = CreateRebar(hwnd, hwndToolbar, hwndCombo);
        break;
    }
    case WM_SIZE: {
        // 调整重条控件的大小
        RECT rc;
        GetClientRect(hwnd, &rc);
        MoveWindow(GetDlgItem(hwnd, ID_REBAR), 0, 0, rc.right, rc.bottom, TRUE);
        
        break;
    }
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd, message, wParam, lParam);
    }
    return 0;
}

HWND CreateRebar(HWND hwndOwner, HWND hwndToolbar, HWND hwndCombo) {
    // Check parameters.
    if ((hwndToolbar == NULL) || (hwndCombo == NULL)) {
        return NULL;
    }

    // Create the rebar.
    HWND hwndRebar = CreateWindowEx(0,
        REBARCLASSNAME,
        NULL,
        WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | RBS_VARHEIGHT | RBS_BANDBORDERS,
        0, 0, 500, 100,
        hwndOwner,
        NULL,
        g_hInst,
        NULL);

    if (!hwndRebar) {
        return NULL;
    }

    // Initialize band info used by both bands.
    REBARBANDINFO rbBand = { sizeof(REBARBANDINFO) };
    rbBand.fMask = RBBIM_STYLE | RBBIM_CHILD | RBBIM_CHILDSIZE | RBBIM_SIZE | RBBIM_ID;
    rbBand.fStyle = RBBS_CHILDEDGE | RBBS_NOGRIPPER;

    // Get the height of the toolbar.
    DWORD dwBtnSize = (DWORD)SendMessage(hwndToolbar, TB_GETBUTTONSIZE, 0, 0);

    // Set values unique to the band with the toolbar.
    rbBand.hwndChild = hwndToolbar;
    rbBand.cyMinChild = LOWORD(dwBtnSize);
    rbBand.cyMaxChild = LOWORD(dwBtnSize);
    rbBand.cx = 500; // Default width of the toolbar

    // Add the band that has the toolbar.
    SendMessage(hwndRebar, RB_INSERTBAND, (WPARAM)-1, (LPARAM)&rbBand);

    // 获取combo box的高度，设定足够的空间进行展开
    int cyCombo = 200;

    // Set values unique to the band with the combo box.
    RECT rc;
    GetWindowRect(hwndCombo, &rc);
    MapWindowPoints(HWND_DESKTOP, hwndOwner, (LPPOINT)&rc, 2);  // 映射至相对位置
    rbBand.hwndChild = hwndCombo;
    rbBand.lpText = const_cast<wchar_t*>(L"Options");
    rbBand.cyMinChild = cyCombo;  // 核心修改: 使用实际需求的高度
    rbBand.cyMaxChild = cyCombo;
    rbBand.cx = 200;  // Width for the combo box

    // Add the band that has the combo box.
    SendMessage(hwndRebar, RB_INSERTBAND, (WPARAM)-1, (LPARAM)&rbBand);
    return hwndRebar;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, int nCmdShow) {
    g_hInst = hInstance;

    // Initialize common controls
    INITCOMMONCONTROLSEX icex;
    icex.dwSize = sizeof(icex);
    icex.dwICC = ICC_BAR_CLASSES; // Initialize ReBar and ToolBar classes
    InitCommonControlsEx(&icex);

    // Create window class
    WNDCLASS wc = {};
    wc.lpfnWndProc = WindowProc;
    wc.hInstance = hInstance;
    wc.lpszClassName = L"ReBarExample";
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);

    RegisterClass(&wc);

    // Create the main window
    HWND hwnd = CreateWindowEx(
        0, L"ReBarExample", L"ReBarWindow32 Example",
        WS_OVERLAPPEDWINDOW | WS_VISIBLE,
        CW_USEDEFAULT, CW_USEDEFAULT, 500, 200,
        NULL, NULL, hInstance, NULL);

    // Message loop
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0) > 0) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int)msg.wParam;
}

（此代码存在bug)

来源：https://learn.microsoft.com/zh-cn/windows/win32/controls/create-rebar-controls