#include "stdafx.h"
#include "OS_1.h"

#define MAX_LOADSTRING 100

HINSTANCE hInst;
TCHAR szMainTitle[]=_T("Лабораторная работа №1 по ОС студ. Беляева М.О. группа ИУС-10б");
TCHAR szWindowClass[MAX_LOADSTRING];
ATOM                MainClass(HINSTANCE hInstance);
ATOM                ChildClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    MainWndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK    ChildWndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY _tWinMain(_In_ HINSTANCE hInstance,
                     _In_opt_ HINSTANCE hPrevInstance,
                     _In_ LPTSTR    lpCmdLine,
                     _In_ int       nCmdShow)
{
    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);
    MSG msg;
    HACCEL hAccelTable;
    LoadString(hInstance, IDC_OS_1, szWindowClass, MAX_LOADSTRING);
    MainClass(hInstance);
    ChildClass(hInstance);
    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }
    hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_OS_1));
    while (GetMessage(&msg, NULL, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }
    return (int) msg.wParam;
}

ATOM MainClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;
    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style          = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;
    wcex.lpfnWndProc    = MainWndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInstance;
    wcex.hIcon          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_OS_1));
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName   = MAKEINTRESOURCE(IDC_OS_1);
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
    return RegisterClassEx(&wcex);
}

ATOM ChildClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;
    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style          = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS ;
    wcex.lpfnWndProc    = ChildWndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInstance;
    wcex.hIcon          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_OS_1));
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName   = MAKEINTRESOURCE(IDC_OS_1);
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
    return RegisterClassEx(&wcex);
}

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWndMain, hWndChild;
   hInst = hInstance;
   hWndMain = CreateWindow(szWindowClass, szMainTitle, WS_EX_APPWINDOW | WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
   hWndChild = CreateWindow(szWindowClass,_T("DERP"), WS_CHILD | WS_OVERLAPPEDWINDOW,
       0, 0, GetSystemMetrics(SM_CXFULLSCREEN)/5, GetSystemMetrics(SM_CYFULLSCREEN)/5, hWndMain, NULL, hInstance, NULL);
   if (!hWndMain&&!hWndChild)
   {
      return FALSE;
   }
   ShowWindow(hWndMain, SW_MAXIMIZE);
   ShowWindow(hWndChild, SW_NORMAL);
   UpdateWindow(hWndMain);
   UpdateWindow(hWndChild);
   return TRUE;
}

LRESULT CALLBACK MainWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    TCHAR lpString[] = _T("События данного окна обрабатыватся функцией LRESULT CALLBACK MainWndProc()");
    switch (message)
    {
    case WM_COMMAND:
        wmId    = LOWORD(wParam);
        wmEvent = HIWORD(wParam);
        switch (wmId)
        {
        case IDM_ABOUT:
            DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
            break;
        case IDM_EXIT:
            DestroyWindow(hWnd);
            break;
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
        }
        break;
    case WM_LBUTTONDBLCLK:
        Beep(1000,1000);
        break;
    case WM_RBUTTONDBLCLK:
        MessageBox(hWnd,lpString,_T("Информационное сообщение"),NULL);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

LRESULT CALLBACK ChildWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    RECT rect;
    enum location {TOP,RIGHT,BOTTOM,LEFT};
    location loc=TOP;
    int width, height, d;
    switch (message)
    {
    case WM_COMMAND:
        wmId    = LOWORD(wParam);
        wmEvent = HIWORD(wParam);
        switch (wmId)
        {
        case IDM_ABOUT:
            DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
            break;
        case IDM_EXIT:
            DestroyWindow(hWnd);
            break;
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
        }
        break;
    case WM_LBUTTONDBLCLK:
        if(GetWindowRect(hWnd, &rect))
        {
            width=rect.right-rect.left;
            height=rect.bottom-rect.top;
        }
        else break;
        if(loc==TOP)
        {
            if(GetSystemMetrics(SM_CXFULLSCREEN)-rect.right<100)
            {
                d=GetSystemMetrics(SM_CXFULLSCREEN)-rect.right; loc=RIGHT;
            }
            else
                d=100;
            MoveWindow(hWnd,d,0,width,height,true);
        }
        if(loc==RIGHT)
        {
            if(GetSystemMetrics(SM_CYFULLSCREEN)-rect.bottom<100)
            {
                d=GetSystemMetrics(SM_CYFULLSCREEN)-rect.bottom; loc=BOTTOM;
            }
            else
                d=100;
            MoveWindow(hWnd,0,d,width,height,true);
        }
        if(loc==BOTTOM)
        {
            if(rect.left<100)
            {
                d=rect.left; loc=LEFT;
            }
            else
                d=100;
            MoveWindow(hWnd,-d,0,width,height,true);
        }
        if(loc==LEFT)
        {
            if(rect.top<100)
            {
                d=rect.top; loc=TOP;
            }
            else
                d=100;
            MoveWindow(hWnd,0,-d,width,height,true);
        }
        break;
    case WM_RBUTTONDBLCLK:
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    UNREFERENCED_PARAMETER(lParam);
    switch (message)
    {
    case WM_INITDIALOG:
        return (INT_PTR)TRUE;

    case WM_COMMAND:
        if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
        {
            EndDialog(hDlg, LOWORD(wParam));
            return (INT_PTR)TRUE;
        }
        break;
    }
    return (INT_PTR)FALSE;
}