/Samples/Chap10/PoorMenu/PoorMenu.d

/+
 + Copyright (c) Charles Petzold, 1998.
 + Ported to the D Programming Language by Andrej Mitrovic, 2011.
 +/

module PoorMenu;

import core.runtime;
import core.thread;
import std.conv;
import std.math;
import std.range;
import std.string;
import std.utf;

auto toUTF16z(S)(S s)
{
    return toUTFz!(const(wchar)*)(s);
}

pragma(lib, "gdi32.lib");

import core.sys.windows.windef;
import core.sys.windows.winuser;
import core.sys.windows.wingdi;
import core.sys.windows.winbase;

string appName = "PoorMenu";
enum ID_TIMER = 1;
HINSTANCE hinst;

extern (Windows)
int WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int iCmdShow)
{
    int result;

    try
    {
        Runtime.initialize();
        result = myWinMain(hInstance, hPrevInstance, lpCmdLine, iCmdShow);
        Runtime.terminate();
    }
    catch (Throwable o)
    {
        MessageBox(null, o.toString().toUTF16z, "Error", MB_OK | MB_ICONEXCLAMATION);
        result = 0;
    }

    return result;
}

int myWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int iCmdShow)
{
    HMENU hMenu;
    HWND hwnd;
    MSG  msg;
    WNDCLASS wndclass;

    wndclass.style         = CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc   = &WndProc;
    wndclass.cbClsExtra    = 0;
    wndclass.cbWndExtra    = 0;
    wndclass.hInstance     = hInstance;
    wndclass.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
    wndclass.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wndclass.hbrBackground = cast(HBRUSH) GetStockObject(WHITE_BRUSH);

    wndclass.lpszMenuName  = NULL;
    wndclass.lpszClassName = appName.toUTF16z;

    if (!RegisterClass(&wndclass))
    {
        MessageBox(NULL, "This program requires Windows NT!", appName.toUTF16z, MB_ICONERROR);
        return 0;
    }

    hwnd = CreateWindow(appName.toUTF16z,              // window class name
                        "PoorMenu",                    // window caption
                        WS_OVERLAPPEDWINDOW,           // window style
                        CW_USEDEFAULT,                 // initial x position
                        CW_USEDEFAULT,                 // initial y position
                        CW_USEDEFAULT,                 // initial x size
                        CW_USEDEFAULT,                 // initial y size
                        NULL,                          // parent window handle
                        NULL,                          // window menu handle
                        hInstance,                     // program instance handle
                        NULL);                         // creation parameters

    hMenu = GetSystemMenu(hwnd, FALSE);

    AppendMenu(hMenu, MF_SEPARATOR, 0,           NULL);
    AppendMenu(hMenu, MF_STRING, IDM_SYS_ABOUT,  "About...");
    AppendMenu(hMenu, MF_STRING, IDM_SYS_HELP,   "Help...");
    AppendMenu(hMenu, MF_STRING, IDM_SYS_REMOVE, "Remove Additions");

    ShowWindow(hwnd, iCmdShow);
    UpdateWindow(hwnd);

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

    return msg.wParam;
}

enum IDM_SYS_ABOUT  = 1;
enum IDM_SYS_HELP   = 2;
enum IDM_SYS_REMOVE = 3;

extern (Windows)
LRESULT WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) nothrow
{
    scope (failure) assert(0);

    switch (message)
    {
        case WM_SYSCOMMAND:
        {
            switch (LOWORD(wParam))
            {
                case IDM_SYS_ABOUT:
                    MessageBox(hwnd, "A Poor-Person's Menu Program\n(c) Charles Petzold, 1998",
                               appName.toUTF16z, MB_OK | MB_ICONINFORMATION);
                    return 0;

                case IDM_SYS_HELP:
                    MessageBox(hwnd, "Help not yet implemented!",
                               appName.toUTF16z, MB_OK | MB_ICONEXCLAMATION);
                    return 0;

                case IDM_SYS_REMOVE:
                    GetSystemMenu(hwnd, TRUE);
                    return 0;

                default:
            }

            break;
        }

        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;

        default:
    }

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