// Compteur cliquable : clic = +1, Shift + clic = remise à zéro.
// Compilation : cl.exe /EHsc compteur.cpp /link /SUBSYSTEM:WINDOWS

#include <windows.h>

int compteur = 0;

HICON CreateCounterIcon()
{
    HDC hdc = GetDC(NULL);
    HDC memDC = CreateCompatibleDC(hdc);
    HBITMAP color = CreateCompatibleBitmap(hdc, 32, 32);
    HBITMAP old = (HBITMAP)SelectObject(memDC, color);

    HBRUSH black = CreateSolidBrush(RGB(0, 0, 0));
    RECT r = { 0, 0, 32, 32 };
    FillRect(memDC, &r, black);
    DeleteObject(black);

    HFONT font = CreateFontW(29, 0, 0, 0, FW_BOLD, FALSE, FALSE, FALSE, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH, L"Arial");
    HFONT oldFont = (HFONT)SelectObject(memDC, font);

    SetBkMode(memDC, TRANSPARENT);
    SetTextColor(memDC, RGB(255, 255, 255));
    DrawTextW(memDC, L"C", -1, &r, DT_CENTER | DT_VCENTER | DT_SINGLELINE);

    SelectObject(memDC, oldFont);
    DeleteObject(font);
    SelectObject(memDC, old);

    HBITMAP mask = CreateBitmap(32, 32, 1, 1, NULL);

    ICONINFO ii = {};
    ii.fIcon = TRUE;
    ii.hbmMask = mask;
    ii.hbmColor = color;

    HICON icon = CreateIconIndirect(&ii);

    DeleteObject(mask);
    DeleteObject(color);
    DeleteDC(memDC);
    ReleaseDC(NULL, hdc);

    return icon;
}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
    case WM_LBUTTONDOWN:
        if (wParam & MK_SHIFT) compteur = 0; else compteur++;
        InvalidateRect(hwnd, NULL, TRUE);
        return 0;

    case WM_PAINT:
    {
        PAINTSTRUCT ps;
        HDC hdc = BeginPaint(hwnd, &ps);
        RECT rect;
        GetClientRect(hwnd, &rect);

        HBRUSH blackBrush = CreateSolidBrush(RGB(0, 0, 0));
        FillRect(hdc, &rect, blackBrush);
        DeleteObject(blackBrush);

        HFONT font = CreateFontW(48, 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_DONTCARE, L"Arial");
        HFONT oldFont = (HFONT)SelectObject(hdc, font);

        wchar_t texte[32];
        wsprintfW(texte, L"%d", compteur);

        SetBkMode(hdc, TRANSPARENT);
        SetTextColor(hdc, RGB(255, 255, 255));
        DrawTextW(hdc, texte, -1, &rect, DT_CENTER | DT_VCENTER | DT_SINGLELINE);

        SelectObject(hdc, oldFont);
        DeleteObject(font);
        EndPaint(hwnd, &ps);
        return 0;
    }

    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }

    return DefWindowProcW(hwnd, uMsg, wParam, lParam);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, int nCmdShow)
{
    const wchar_t CLASS_NAME[] = L"CompteurWin32";
    HICON icon = CreateCounterIcon();

    WNDCLASSW wc = {};
    wc.lpfnWndProc = WindowProc;
    wc.hInstance = hInstance;
    wc.lpszClassName = CLASS_NAME;
    wc.hCursor = LoadCursorW(NULL, IDC_ARROW);
    wc.hIcon = icon;
    wc.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);

    RegisterClassW(&wc);

    HWND hwnd = CreateWindowExW(0, CLASS_NAME, L"Compteur", WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU, CW_USEDEFAULT, CW_USEDEFAULT, 40, 80, NULL, NULL, hInstance, NULL);

    if (!hwnd) return 0;

    SendMessageW(hwnd, WM_SETICON, ICON_BIG, (LPARAM)icon);
    SendMessageW(hwnd, WM_SETICON, ICON_SMALL, (LPARAM)icon);

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

    MSG msg = {};

    while (GetMessageW(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessageW(&msg);
    }

    DestroyIcon(icon);

    return 0;
}