I have created a working application with pure win32 APIs and C. It has a shared "status area" on top. Rest of the area displays device information (multiple fields per device).

How do I make the device information area only scrollable?

All my widgets are currently attached to single main window handle. See here the picture about what I want :

There must be a simple way to like group the widgets of bottom page and attach scrollbar to only the group, but I cannot seem to find a working technique with google. I guess my problem is I do not know hot to create groups of widgets or something. Attaching scrollbar to to the full window works fine but I want only partial.

For those interested: I'm using Dev-C 5.11 with TDM-GCC 4.9.2 . I don't have and won't have a resource editor. It is all in C code.

Help!

Edit1: Ok, I believe the correct term I need to search for is "child windows" per

CodePudding user response：

Ok, i reduced the code into a minimum:

CodePudding user response：

you dont need call to ShowWindow twice, I edited it a bit

#include <windows.h>

#define WIDTH           480
#define HEIGHT          560
#define WC_HELLOW       TEXT("HelloApplication")
#define WC_CHILDWINDOW  TEXT("ChildWindow")

HWND topHwnd, childHwnd[2];

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK ChildWndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    PSTR szCMLine, int iCmdShow)
{
    WNDCLASS wc;
    wc.style         = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc   = WndProc;
    wc.cbClsExtra    = 0;
    wc.cbWndExtra    = sizeof(long);
    wc.hInstance     = hInstance;
    wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)GetStockObject(GRAY_BRUSH);
    wc.lpszMenuName  = NULL;
    wc.lpszClassName = WC_HELLOW;

    RegisterClass(&wc);

    wc.lpszClassName = WC_CHILDWINDOW;
    wc.lpfnWndProc = ChildWndProc;
    wc.hbrBackground = (HBRUSH)GetStockObject(DKGRAY_BRUSH);
    RegisterClass(&wc);

    int x = (GetSystemMetrics(SM_CXSCREEN) - WIDTH) / 2;
    int y = (GetSystemMetrics(SM_CYSCREEN) - HEIGHT) / 2;

    topHwnd = CreateWindow(WC_HELLOW,
        TEXT("Hello World for Windows"),
        WS_OVERLAPPEDWINDOW,
        x,
        y,
        WIDTH,
        HEIGHT,
        NULL,
        NULL,
        hInstance,
        NULL);

    ShowWindow(topHwnd, iCmdShow);
    UpdateWindow(topHwnd);

    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    RECT    rect;

    switch (message)
    {
    case WM_CREATE: {
        HINSTANCE hInst = (HINSTANCE)GetWindowLongPtr(hwnd, GWLP_HINSTANCE);
        GetClientRect(hwnd, &rect);
        RECT rc[2]; 
        rc[0] = rc[1] = rect;
        rc[0].bottom = rc[0].top   100;
        rc[1].top = rc[1].top   100;
        for (int i = 0; i < 2; i  ) InflateRect(&rc[i], -5, -5);
        childHwnd[0] = CreateWindow(WC_CHILDWINDOW, "", WS_CHILD | WS_VISIBLE, rc[0].left, rc[0].top, rc[0].right - rc[0].left, rc[0].bottom - rc[0].top, hwnd, 0, hInst, 0);
        childHwnd[1] = CreateWindow(WC_CHILDWINDOW, "", WS_CHILD | WS_VISIBLE | WS_VSCROLL,
            rc[1].left, rc[1].top, rc[1].right - rc[1].left, rc[1].bottom - rc[1].top, hwnd, 0, hInst, 0);

    }break;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return DefWindowProc(hwnd, message, wParam, lParam);
}

LRESULT CALLBACK ChildWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    HDC     hdc;
    PAINTSTRUCT ps;
    RECT    rc;

    switch (message) {
    case WM_CREATE:
        return 0;

    case WM_PAINT:
        hdc = BeginPaint(hwnd, &ps);
        GetClientRect(hwnd, &rc);
        SetBkMode(hdc, TRANSPARENT);
        SetTextColor(hdc, RGB(200, 200, 200));
        SelectObject(hdc, GetStockObject(DKGRAY_BRUSH));
        Rectangle(hdc, rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top);
        DrawText(hdc, TEXT("Hello, Childs"), -1, &rc,
            DT_SINGLELINE | DT_CENTER | DT_VCENTER);
        EndPaint(hwnd, &ps);
        return 0;

    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return DefWindowProc(hwnd, message, wParam, lParam);
}

I hope this helps