mirror-windows.cpp

// lab1-proba.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "lab1-proba.h"

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst;                                // current instance
WCHAR szTitle[MAX_LOADSTRING];                  // The title bar text
WCHAR szWindowClass[MAX_LOADSTRING];            // the main window class name

// Forward declarations of functions included in this code module:
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
	_In_opt_ HINSTANCE hPrevInstance,
	_In_ LPWSTR    lpCmdLine,
	_In_ int       nCmdShow)
{
	UNREFERENCED_PARAMETER(hPrevInstance);
	UNREFERENCED_PARAMETER(lpCmdLine);

	// TODO: Place code here.

	// Initialize global strings
	LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
	LoadStringW(hInstance, IDC_LAB1PROBA, szWindowClass, MAX_LOADSTRING);
	MyRegisterClass(hInstance);

	// Perform application initialization:
	if (!InitInstance(hInstance, nCmdShow))
	{
		return FALSE;
	}

	HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_LAB1PROBA));

	MSG msg;

	// Main message loop:
	while (GetMessage(&msg, nullptr, 0, 0))
	{
		if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}

	return (int)msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
	WNDCLASSEXW wcex;

	wcex.cbSize = sizeof(WNDCLASSEX);

	wcex.style = CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc = WndProc;
	wcex.cbClsExtra = 0;
	wcex.cbWndExtra = 0;
	wcex.hInstance = hInstance;
	wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_LAB1PROBA));
	wcex.hCursor = LoadCursor(nullptr, IDC_HAND);
	wcex.hbrBackground = CreateSolidBrush(RGB(0,0,0));
	wcex.lpszMenuName = MAKEINTRESOURCEW(IDC_LAB1PROBA);
	wcex.lpszClassName = szWindowClass;
	wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

	return RegisterClassExW(&wcex);
}

//
//   FUNCTION: InitInstance(HINSTANCE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
	hInst = hInstance; // Store instance handle in our global variable

	int screenWidth = GetSystemMetrics(SM_CXSCREEN),
		screenHeight = GetSystemMetrics(SM_CYSCREEN);
	long windowsStyles = WS_EX_TOPMOST | WS_EX_LAYERED | WS_POPUP;
	windows[0] = CreateWindowW(szWindowClass, szTitle, windowsStyles, screenWidth - WINDOW_SIZE, 0, WINDOW_SIZE, WINDOW_SIZE, nullptr, nullptr, hInstance, nullptr);
	windows[1] = CreateWindowW(szWindowClass, szTitle, windowsStyles, 0, 0, WINDOW_SIZE, WINDOW_SIZE, nullptr, nullptr, hInstance, nullptr);
	windows[2] = CreateWindowW(szWindowClass, szTitle, windowsStyles, 0, screenHeight - WINDOW_SIZE, WINDOW_SIZE, WINDOW_SIZE, nullptr, nullptr, hInstance, nullptr);
	windows[3] = CreateWindowW(szWindowClass, szTitle, windowsStyles, screenWidth - WINDOW_SIZE, screenHeight - WINDOW_SIZE, WINDOW_SIZE, WINDOW_SIZE, nullptr, nullptr, hInstance, nullptr);
	SetWindowPos(windows[0], HWND_TOPMOST, screenWidth - WINDOW_SIZE, 0, WINDOW_SIZE, WINDOW_SIZE, SWP_SHOWWINDOW);
	SetWindowPos(windows[1], HWND_TOPMOST, 0, 0, WINDOW_SIZE, WINDOW_SIZE, SWP_SHOWWINDOW);
	SetWindowPos(windows[2], HWND_TOPMOST, 0, screenHeight - WINDOW_SIZE, WINDOW_SIZE, WINDOW_SIZE, SWP_SHOWWINDOW);
	SetWindowPos(windows[3], HWND_TOPMOST, screenWidth - WINDOW_SIZE, screenHeight - WINDOW_SIZE, WINDOW_SIZE, WINDOW_SIZE, SWP_SHOWWINDOW);

	for (int i = 0; i < 4; i++)
		if (!windows[i])
			return FALSE;

	for (int i = 0; i < 4; i++)
	{
		SetWindowInitialTransparency(windows[i]);
		ShowWindow(windows[i], nCmdShow);
		UpdateWindow(windows[i]);
	}

	for (int i = 1; i < 4; i++)
	{
		HWND hWnd = windows[i];
		long style = GetWindowLong(hWnd, GWL_STYLE);

		style |= WS_EX_TOOLWINDOW;   // flags don't work - windows remains in taskbar
		style &= ~(WS_EX_APPWINDOW);

		SetWindowLong(hWnd, GWL_EXSTYLE, style); // set the style
	}


	return TRUE;
}

//
//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND  - process the application menu
//  WM_PAINT    - Paint the main window
//  WM_DESTROY  - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch (message)
	{

	case WM_CREATE:
	{
		for (int i = 0; i < 4; i++)
			timers[i] = 0;
		SetTimer(hWnd, 0, 100, NULL);
		HMENU menu = GetSystemMenu(hWnd, FALSE);
		RemoveMenu(menu, 1, MF_BYPOSITION);
		SetMenu(hWnd, menu);
	}
	break;

	case WM_TIMER:
		ChangeWindowOpacity(hWnd);
		break;

	case WM_KEYDOWN:
		return MoveWindowsSymetrically(hWnd, message, wParam, lParam);

	case WM_COMMAND:
	{
		int wmId = LOWORD(wParam);
		// Parse the menu selections:
		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_PAINT:
	{
		PAINTSTRUCT ps;
		HDC hdc = BeginPaint(hWnd, &ps);
		// TODO: Add any drawing code that uses hdc here...
		EndPaint(hWnd, &ps);
	}
	break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
}

// Message handler for about box.
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;
}

LRESULT CALLBACK MoveWindowsSymetrically(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	int quadrant = GetQuadrant(hWnd);

	// Difference with regards to the window in the second quadrant (top-left)
	int xDifference = 0,
		yDifference = 0;
	switch (wParam)
	{
	case VK_LEFT:
		if (quadrant == 2 || quadrant == 3)
			xDifference -= MOVE_STEP;
		else
			xDifference += MOVE_STEP;
		break;

	case VK_RIGHT:
		if (quadrant == 2 || quadrant == 3)
			xDifference += MOVE_STEP;
		else
			xDifference -= MOVE_STEP;
		break;

	case VK_UP:
		if (quadrant == 1 || quadrant == 2)
			yDifference -= MOVE_STEP;
		else
			yDifference += MOVE_STEP;
		break;

	case VK_DOWN:
		if (quadrant == 1 || quadrant == 2)
			yDifference += MOVE_STEP;
		else
			yDifference -= MOVE_STEP;
		break;

	default:
		return DefWindowProc(hWnd, message, wParam, lParam);
	}

	MoveWindows(xDifference, yDifference);
	return 0;
}

void MoveWindows(int xDifference, int yDifference)
{
	RECT topLeftWindowRect;
	GetWindowRect(windows[1], &topLeftWindowRect);

	topLeftWindowRect.left += xDifference;
	topLeftWindowRect.top += yDifference;

	int screenWidth = GetSystemMetrics(SM_CXSCREEN),
		screenHeight = GetSystemMetrics(SM_CYSCREEN);

	int maxXPos = screenWidth / 2 - WINDOW_SIZE,
		maxYPos = screenHeight / 2 - WINDOW_SIZE;

	if (topLeftWindowRect.left < 0)
		topLeftWindowRect.left = 0;
	if (topLeftWindowRect.left > maxXPos)
		topLeftWindowRect.left = maxXPos;

	if (topLeftWindowRect.top < 0)
		topLeftWindowRect.top = 0;
	if (topLeftWindowRect.top > maxYPos)
		topLeftWindowRect.top = maxYPos;

	// Second quadrant
	MoveWindow(windows[1], topLeftWindowRect.left, topLeftWindowRect.top, WINDOW_SIZE, WINDOW_SIZE, TRUE);
	// First quadrant
	MoveWindow(windows[0], screenWidth - topLeftWindowRect.left - WINDOW_SIZE, topLeftWindowRect.top, WINDOW_SIZE, WINDOW_SIZE, TRUE);
	// Third quadrant
	MoveWindow(windows[2], topLeftWindowRect.left, screenHeight - topLeftWindowRect.top - WINDOW_SIZE, WINDOW_SIZE, WINDOW_SIZE, TRUE);
	// Fourth quadrant
	MoveWindow(windows[3], screenWidth - topLeftWindowRect.left - WINDOW_SIZE, screenHeight - topLeftWindowRect.top - WINDOW_SIZE, WINDOW_SIZE, WINDOW_SIZE, TRUE);
}

void SetWindowInitialTransparency(HWND hWnd)
{
	int quadrant = GetQuadrant(hWnd);

	SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_LAYERED);
	if (quadrant == 2 || quadrant == 4)
	{
		SetLayeredWindowAttributes(hWnd, 0, 0.05 * 255, LWA_ALPHA);
	}
	else
	{
		SetLayeredWindowAttributes(hWnd, 0, 0.95 * 255, LWA_ALPHA);
	}
}

int GetQuadrant(HWND hWnd)
{
	int quadrant = 0;
	for (int i = 0; i < 4; i++)
	{
		if (hWnd == windows[i])
		{
			quadrant = i + 1;
			break;
		}
	}

	return quadrant;
}

void ChangeWindowOpacity(HWND hWnd)
{
	int quadrant = GetQuadrant(hWnd);
	
	int nextAlpha = 0;
	timers[quadrant - 1] += 5;
	timers[quadrant - 1] %= 180;

	if (quadrant == 1 || quadrant == 3)
	{
		// zaczynamy od 5%
		nextAlpha = 5;
		if (timers[quadrant - 1] <= 90)
			nextAlpha += timers[quadrant - 1];
		else
			nextAlpha += 180 - timers[quadrant - 1];
	}
	else
	{
		// zaczynamy od 95%
		nextAlpha = 95;
		if (timers[quadrant - 1] <= 90)
			nextAlpha -= timers[quadrant - 1];
		else
			nextAlpha -= 180 - timers[quadrant - 1];
	}

	SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_LAYERED);
	SetLayeredWindowAttributes(hWnd, 0, (255 * nextAlpha) / 100, LWA_ALPHA);
	//ShowWindow(hWnd, SW_SHOWNA);
	UpdateWindow(hWnd);
}