Header Control Example

To create a header control specify WC_HEADER as the window class and register the class by specifying the ICC_LISTVIEW_CLASSES bit flag in the accompanying INITCOMMONCONTROLSEX structure.

Header items are inserted and managed by sending messages such as HDM_INSERTITEM, HDM_DELETEITEM, and HDM_SETITEM. By default, each section displays a text label and a separator; however, specifying the HDS_BUTTONS window style causes each header section to behave like a push button, allowing the application to respond to user clicks on the

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

#define ID_HEADER 100

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

HWND CreateHeader(HWND hwndParent);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);


int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine, int nCmdShow)
{
    WNDCLASSEX wc;
    MSG msg;

    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = 0;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wc.lpszMenuName = NULL;
    wc.lpszClassName = TEXT("myWindowClass");
    wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

    RegisterClassEx(&wc);


    CreateWindowEx(WS_EX_CLIENTEDGE,
        TEXT("myWindowClass"),
        TEXT("Header Control"),
        WS_VISIBLE | WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        400,
        120,
        NULL,
        NULL,
        hInstance,
        NULL);


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

    return msg.wParam;
}



LRESULT CALLBACK WndProc(HWND hwnd, UINT msg,
                         WPARAM wParam, LPARAM lParam)
{
    static HWND headerCtl;

    switch(msg)
    {

    case WM_CREATE:
    {
        INITCOMMONCONTROLSEX icex;

        icex.dwSize = sizeof(INITCOMMONCONTROLSEX);
        icex.dwICC = ICC_LISTVIEW_CLASSES;

        InitCommonControlsEx(&icex);

        headerCtl = CreateHeader(hwnd);

        break;
    }


    case WM_SIZE:
    {
        RECT rect;
        HDLAYOUT hdl;
        HDITEM hdi;
        WINDOWPOS winpos;


        GetClientRect(hwnd,&rect);

        hdl.prc = &rect;
        hdl.pwpos = &winpos;


        Header_Layout(headerCtl,&hdl);

        MoveWindow(headerCtl,
                   winpos.x,
                   winpos.y,
                   winpos.cx,
                   winpos.cy,
                   TRUE);



        hdi.mask = HDI_TEXT | HDI_FORMAT | HDI_WIDTH;
        hdi.pszText = TEXT("column 2");
        hdi.cxy = rect.right - 150;
        hdi.cchTextMax = lstrlen(hdi.pszText);
        hdi.fmt = HDF_LEFT | HDF_STRING;


        SendMessage(headerCtl,
                    HDM_SETITEM,
                    (WPARAM)1,
                    (LPARAM)&hdi);

        break;
    }

    case WM_NOTIFY:
    {
        NMHEADER *header_item;

        header_item = (NMHEADER *)lParam;


        if(header_item->hdr.code == HDN_ITEMCLICK)
        {
            switch(header_item->iItem)
            {

            case 0:
                MessageBox(NULL,
                           TEXT("header 1"),
                           TEXT("header 1 clicked"),
                           MB_OK);
                break;


            case 1:
                MessageBox(NULL,
                           TEXT("header 2"),
                           TEXT("header 2 clicked"),
                           MB_OK);
                break;
            }
        }

        return 0;
    }

    case WM_CLOSE:

        DestroyWindow(hwnd);
        break;

    case WM_DESTROY:

        PostQuitMessage(0);
        break;

    default:

        return DefWindowProc(hwnd,msg,wParam,lParam);
    }

    return 0;
}
HWND CreateHeader(HWND hwndParent)
{
    HWND hwndHeader;
    RECT rcParent;
    HDLAYOUT hdl;
    WINDOWPOS wp;


    hwndHeader = CreateWindowEx(0,
        WC_HEADER,
        NULL,
        WS_CHILD | WS_BORDER | HDS_BUTTONS | HDS_HORZ,
        0,
        0,
        0,
        0,
        hwndParent,
        (HMENU)ID_HEADER,
        NULL,
        NULL);


    if(hwndHeader == NULL)
        return NULL;

    GetClientRect(hwndParent,&rcParent);
    hdl.prc = &rcParent;
    hdl.pwpos = &wp;
    if(!SendMessage(hwndHeader,
                    HDM_LAYOUT,
                    0,
                    (LPARAM)&hdl))
        return NULL;
        
    SetWindowPos(hwndHeader,
                 wp.hwndInsertAfter,
                 wp.x,
                 wp.y,
                 wp.cx,
                 wp.cy,
                 wp.flags | SWP_SHOWWINDOW);

    HDITEM hdi;
    // Column 1

    hdi.mask = HDI_TEXT | HDI_FORMAT | HDI_WIDTH;

    hdi.pszText = TEXT("column 1");

    hdi.cxy = 150;

    hdi.cchTextMax = lstrlen(hdi.pszText);

    hdi.fmt = HDF_LEFT | HDF_STRING;

    SendMessage(hwndHeader,
                HDM_INSERTITEM,
                (WPARAM)0,
                (LPARAM)&hdi);
    // Column 2

    hdi.mask = HDI_TEXT | HDI_FORMAT | HDI_WIDTH;

    hdi.pszText = TEXT("column 2");

    hdi.cxy = rcParent.right - 150;

    hdi.cchTextMax = lstrlen(hdi.pszText);

    hdi.fmt = HDF_LEFT | HDF_STRING;
    
    SendMessage(hwndHeader,
                HDM_INSERTITEM,
                (WPARAM)1,
                (LPARAM)&hdi);



    return hwndHeader;
}