[PIU] Cale na Centymetry

#define _CRT_SECURE_NO_WARNINGS
#define SCREEN_WIDTH 700
#define SCREEN_HEIGHT 600
#define TIMER_ID 1
#define BUFF_SIZE 64

#include <windows.h>
#include <tchar.h>

TCHAR className[] = TEXT("Class");
TCHAR appName[] = TEXT("Przelicznik jednostek");

HWND hwnd, valueTextField, resultTextField, inchRadioButton, centyRadioButton;
MSG msg;

RECT getLocalCoordinates() {
    RECT Rect;
    GetWindowRect(hwnd, &Rect);
    MapWindowPoints(HWND_DESKTOP, GetParent(hwnd), (LPPOINT)&Rect, 2);
    return Rect;
}

void SetMoveWindow(const RECT clientRect) {
    MoveWindow(valueTextField, clientRect.right / 3, clientRect.bottom / 2.5, clientRect.right / 7, clientRect.bottom / 20, 1);
    MoveWindow(resultTextField, clientRect.right / 2, clientRect.bottom / 2.5, clientRect.right / 7, clientRect.bottom / 20, 1);
    MoveWindow(inchRadioButton, clientRect.right / 3, clientRect.bottom / 2, clientRect.right / 7, clientRect.bottom / 20, 1);
    MoveWindow(centyRadioButton, clientRect.right / 2, clientRect.bottom / 2, clientRect.right / 7, clientRect.bottom / 20, 1);

    if (clientRect.right <= 500) {
        RECT rect = getLocalCoordinates();

        MoveWindow(hwnd, rect.left, rect.top, 501, rect.bottom - rect.top, 1);
    }

    if (clientRect.bottom <= 500) {
        RECT rect = getLocalCoordinates();

        MoveWindow(hwnd, rect.left, rect.top, rect.right - rect.left, 501, 1);
    }
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
    static RECT clientRect;
    static bool operation = false;

    switch (msg) {
    case WM_CREATE: {
        SetTimer(hwnd, 100, TIMER_ID, NULL);
        GetClientRect(hwnd, &clientRect);
        SetMoveWindow(clientRect);
    }break;

    case WM_SIZE: {
        GetClientRect(hwnd, &clientRect);
        SetMoveWindow(clientRect);
    }break;

    case WM_COMMAND:
        if ((HWND)lParam == inchRadioButton)
            operation = true;
        else if ((HWND)lParam == centyRadioButton)
            operation = false;
        break;

    case WM_TIMER: {
        TCHAR buf[BUFF_SIZE];
        GetWindowText(valueTextField, buf, BUFF_SIZE);

        if (wcslen(buf) < 1)
            _swprintf(buf, TEXT(""));

        if (_wtof(buf))
            if (operation)
                _swprintf(buf, TEXT("%f"), _wtof(buf) * 2.54f);
            else
                _swprintf(buf, TEXT("%f"), _wtof(buf) / 2.54f);

        SetWindowText(resultTextField, buf);
    }break;

    case WM_CLOSE:
        DestroyWindow(hwnd);
        break;

    case WM_DESTROY: {
        KillTimer(hwnd, TIMER_ID);
        PostQuitMessage(0);
    }break;

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

    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    WNDCLASSEX wc;
    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = 0;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.lpfnWndProc = WndProc;
    wc.lpszClassName = className;
    wc.lpszMenuName = NULL;
    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);

    if (RegisterClassEx(&wc) == 0) {
        MessageBox(NULL, TEXT("Some problem with RegisterClassEx"), className, MB_OK);
        return 1;
    }

    hwnd = CreateWindowEx(WS_EX_APPWINDOW | WS_EX_CLIENTEDGE, className, appName, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, SCREEN_WIDTH, SCREEN_HEIGHT, 0, 0, hInstance, 0);
    if (hwnd == NULL) {
        MessageBox(NULL, TEXT("Some problem with CreateWindowEx by hwnd"), className, MB_OK);
        return 1;
    }

    valueTextField = CreateWindowEx(0, TEXT("EDIT"), NULL, WS_CHILD | WS_VISIBLE | WS_BORDER, 0, 0, 0, 0, hwnd, NULL, hInstance, 0);
    if (valueTextField == NULL) {
        MessageBox(NULL, TEXT("Some problem with CreateWindowEx by valueTextField"), className, MB_OK);
        return 1;
    }

    resultTextField = CreateWindowEx(0, TEXT("STATIC"), NULL, WS_CHILD | WS_VISIBLE | WS_BORDER, 0, 0, 0, 0, hwnd, NULL, hInstance, 0);
    if (resultTextField == NULL) {
        MessageBox(NULL, TEXT("Some problem with CreateWindowEx by resultTextField"), className, MB_OK);
        return 1;
    }

    inchRadioButton = CreateWindowEx(0, TEXT("BUTTON"), TEXT("cal -> cm"), WS_CHILD | WS_VISIBLE | WS_BORDER | BS_AUTORADIOBUTTON, 0, 0, 0, 0, hwnd, NULL, hInstance, 0);
    if (inchRadioButton == NULL) {
        MessageBox(NULL, TEXT("Some problem with CreateWindowEx by inchRadioButton"), className, MB_OK);
        return 1;
    }

    centyRadioButton = CreateWindowEx(0, TEXT("BUTTON"), TEXT("cm -> cal"), WS_CHILD | WS_VISIBLE | WS_BORDER | BST_CHECKED | BS_AUTORADIOBUTTON, 0, 0, 0, 0, hwnd, NULL, hInstance, 0);
    if (centyRadioButton == NULL) {
        MessageBox(NULL, TEXT("Some problem with CreateWindowEx by centyRadioButton"), className, MB_OK);
        return 1;
    }

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

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

    UnregisterClass(className, hInstance);

    return msg.wParam;
}