Движение окон по часовой стрелке, не перекрывающих друг друга - C++ WinAPI - Ответ 11914452

#include <windows.h>
LPCSTR lpszClassName = "MainClass";
LPCSTR lpszPopClass = "Pop-upClass";
LPCSTR lpszCaption = "Задание 15";
/*------------------*/
HINSTANCE hInst = NULL;
/*------------------*/
BOOL RegClass( WNDPROC, LPCSTR, UINT );
/*------------------*/
int width, height;
int x , y;
int corner = 1, corner_1 = 3 ; // начальные позиции окон
LRESULT CALLBACK lpfnMainProcc( HWND, UINT, WPARAM, LPARAM );
LRESULT CALLBACK lpfnPopUpProcc( HWND, UINT, WPARAM, LPARAM );
/*------------------*/
int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int nCmdShow )
{
MSG message;
HWND hWnd;
hInst = hInstance;
if( !RegClass( lpfnMainProcc, lpszClassName, COLOR_3DHIGHLIGHT))
    return FALSE;
if( !RegClass( lpfnPopUpProcc, lpszPopClass, COLOR_DESKTOP))
    return FALSE;
/*------------------*/
width = GetSystemMetrics( SM_CXSCREEN );
width /= 2;
height = GetSystemMetrics( SM_CYSCREEN );
height /= 2;
/*-----------------*/
if( ( hWnd = CreateWindow( lpszClassName, lpszCaption, WS_OVERLAPPEDWINDOW, 0, 0, width, height , NULL, NULL, hInst, NULL)) == NULL )
    return FALSE;
ShowWindow( hWnd, nCmdShow );
while( GetMessage( &message, NULL, 0, 0))
    DispatchMessage( &message );
 
    return message.wParam;
 
}
BOOL RegClass( WNDPROC lpfnProcc, LPCSTR lpszClassName, UINT  hbrBackground )
{
    WNDCLASS class_name;
    class_name.cbClsExtra = class_name.cbWndExtra = 0;
    class_name.hbrBackground = ( HBRUSH)( hbrBackground + 1 );
    class_name.hCursor = LoadCursor( NULL, IDC_ARROW );
    class_name.hIcon = LoadIcon( NULL, IDI_APPLICATION );
    class_name.hInstance = hInst;
    class_name.lpfnWndProc =  lpfnProcc;
    class_name.lpszClassName = lpszClassName;
    class_name.lpszMenuName = NULL;
    class_name.style = CS_VREDRAW | CS_HREDRAW |CS_DBLCLKS;
    return ( RegisterClass( &class_name) != 0 );
 
}
LRESULT CALLBACK lpfnMainProcc( HWND hWnd, UINT messages, WPARAM wParam, LPARAM lParam )
{
 
 
 static HWND hWndPopUp;
 
 switch( messages )
 {
 case WM_CREATE:
     {
         if( ( hWndPopUp = CreateWindow( lpszPopClass, lpszCaption, WS_POPUPWINDOW | WS_CAPTION | WS_VISIBLE, x + width, y + height, width, height , hWnd, NULL, hInst, NULL)) == NULL )
         {
             MessageBox( hWnd, "Не удалось создать временное окно", "Ошибка", MB_OK | MB_ICONSTOP );
             return FALSE;
         }
         return 0;
     }
 case WM_LBUTTONDOWN:
    {
 
         if( corner != corner_1 - 1  )
            if( corner != 4 || corner_1 != 1 )
             {
                 corner = ( corner == 4)? 0: corner;
                x = ( corner == 1 || corner == 2)*width;
                y = ( corner >= 2)*height;
                SetWindowPos( hWnd, HWND_TOP, x, y, 0, 0, SWP_NOSIZE );
                corner++;
             }
        return 0;
    }
 case WM_DESTROY:
    {
        PostQuitMessage( 0 );
        return 0;
    }
 default: return DefWindowProc( hWnd, messages, wParam, lParam );
}
 
}
LRESULT CALLBACK lpfnPopUpProcc( HWND hWnd, UINT messages, WPARAM wParam, LPARAM lParam )
{
 
switch( messages )
{
 
    case WM_LBUTTONDOWN:
    {
 
         if( corner_1 != corner - 1 )
            if( corner_1 != 4 || corner != 1)
            {
 
             corner_1 = ( corner_1 == 4)? 0: corner_1;
             x = ( corner_1 == 1 || corner_1 == 2)*width;
             y = ( corner_1 >= 2)*height;
             SetWindowPos( hWnd, HWND_TOP, x, y, 0, 0, SWP_NOSIZE );
             corner_1++;
 
            }
 
    return 0;
    }
    default: return DefWindowProc( hWnd, messages, wParam, lParam );
}
}