SelfMovingWindow

SelfMovingWindow

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

LRESULT CALLBACK WindowProc(HWND, UINT, WPARAM, LPARAM);
VOID CALLBACK TimerProc(HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime);

int screenWidth = 0;
int screenHeight = 0;
int shiftX = 25;
int shiftY = 0;

int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR lpszCmdLine, int nCmdShow)
{
	TCHAR szClassWindow[] = L"Win32Application";
	screenWidth = GetSystemMetrics(SM_CXSCREEN);
	screenHeight = GetSystemMetrics(SM_CYSCREEN);

	HWND hWnd;
	MSG lpMsg;
	WNDCLASSEX wcl;
	wcl.cbSize = sizeof(wcl);
	wcl.style = CS_HREDRAW | CS_VREDRAW;
	wcl.lpfnWndProc = WindowProc;
	wcl.cbClsExtra = 0;
	wcl.cbWndExtra = 0;
	wcl.hInstance = hInst;
	wcl.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	wcl.hCursor = LoadCursor(NULL, IDC_ARROW);
	wcl.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wcl.lpszMenuName = NULL;
	wcl.lpszClassName = szClassWindow;
	wcl.hIconSm = NULL;
	if (!RegisterClassEx(&wcl))
		return 0;
	hWnd = CreateWindowEx(0, szClassWindow, TEXT("Self moving window"), WS_OVERLAPPEDWINDOW,
		0, 0, 200, 200, NULL, NULL, hInst, NULL);
	ShowWindow(hWnd, nCmdShow);
	UpdateWindow(hWnd);

	SetTimer(hWnd, 1, 500, TimerProc);

	while (GetMessage(&lpMsg, NULL, 0, 0))
	{
		TranslateMessage(&lpMsg);
		DispatchMessage(&lpMsg);
	}
	return lpMsg.wParam;
}

VOID CALLBACK TimerProc(HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime)
{
	RECT winRect = {};
	GetWindowRect(hwnd, &winRect);

	if (shiftX > 0 && shiftY == 0)
	{
		if (winRect.right == screenWidth)
		{
			shiftX = 0;
			shiftY = 25;
		}
		else if (winRect.right + shiftX > screenWidth)
		{
			shiftX = screenWidth - winRect.right;
		}
	}
	else if (shiftX == 0 && shiftY > 0)
	{
		if (winRect.bottom == screenHeight)
		{
			shiftX = -25;
			shiftY = 0;
		}
		else if (winRect.bottom + shiftY > screenHeight)
		{
			shiftY = screenHeight - winRect.bottom;
		}
	}
	else if (shiftX < 0 && shiftY == 0)
	{
		if (winRect.left == 0)
		{
			shiftX = 0;
			shiftY = -25;
		}
		else if (winRect.left + shiftX < 0)
		{
			shiftX = -1 * winRect.left;
		}
	}
	else if (shiftX == 0 && shiftY < 0)
	{
		if (winRect.top == 0)
		{
			shiftX = 25;
			shiftY = 0;
		}
		else if (winRect.top + shiftY < 0)
		{
			shiftY = -1 * winRect.top;
		}
	}

	MoveWindow(hwnd, winRect.left + shiftX, winRect.top + shiftY, 200, 200, TRUE);

}

LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch (message)
	{
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
}