menu.cpp

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

bool mouseHover = false;
bool menuUp = false;
HWND hWMenu, hWndMain;

LRESULT CALLBACK WndProcMenu(
	_In_ HWND   hWnd,
	_In_ UINT   message,
	_In_ WPARAM wParam,
	_In_ LPARAM lParam
) {
	if (!menuUp)
		return DefWindowProc(hWnd, message, wParam, lParam);

	switch (message)
	{
	case WM_NCACTIVATE:
		if (!wParam) {
			menuUp = false;
			ShowWindow(hWnd, HIDE_WINDOW);
			PostMessage(hWndMain, WM_NCACTIVATE, 0, 0);
		}
	}
	return DefWindowProc(hWnd, message, wParam, lParam);
}

LRESULT CALLBACK WndProc(
	_In_ HWND   hWnd,
	_In_ UINT   message,
	_In_ WPARAM wParam,
	_In_ LPARAM lParam
) {
	PAINTSTRUCT ps;
	HDC hdc;

	TCHAR MenuText[] = _T("RClick For Menu");

	RECT rMENU = { 10,10,130,45 };

	switch (message)
	{
	case WM_PAINT: {
		hdc = BeginPaint(hWnd, &ps);
		COLORREF c;
		if (mouseHover) {
			c = 0xa8a8a8;
		}
		else {
			c = 0xc1c1c1;
		}
		HBRUSH b = CreateSolidBrush(c);
		FillRect(hdc, &rMENU, b);
		DeleteObject(b);
		SetBkMode(hdc, TRANSPARENT);
		TextOut(hdc,
			15, 15,
			MenuText, _tcslen(MenuText));

		EndPaint(hWnd, &ps);
		break;
	}

	case WM_MOUSEMOVE: {
		int xPos = GET_X_LPARAM(lParam);
		int yPos = GET_Y_LPARAM(lParam);
		if (xPos >= 10 && xPos <= 130 && yPos >= 10 && yPos <= 45) {
			if (!mouseHover) {
				mouseHover = true;
				RedrawWindow(hWnd, NULL, NULL,
					RDW_INVALIDATE | RDW_INTERNALPAINT);
			}
		}
		else {
			if (mouseHover) {
				mouseHover = false;
				RedrawWindow(hWnd, NULL, NULL,
					RDW_INVALIDATE | RDW_INTERNALPAINT);
			}
		}
		break;
	}
	case WM_RBUTTONUP: {
		int xPos = GET_X_LPARAM(lParam);
		int yPos = GET_Y_LPARAM(lParam);
		POINT p = { xPos, yPos };
		ClientToScreen(hWnd, &p);
		menuUp = true;
		SetWindowLongPtr(hWMenu, GWLP_HWNDPARENT, (LONG)hWnd);
		SetWindowPos(hWMenu,
			(HWND_TOPMOST),
			p.x, p.y, 0, 0,
			SWP_SHOWWINDOW | SWP_NOSIZE | SWP_NOOWNERZORDER);
		break;
	}
	case WM_NCACTIVATE:
		//paint the window as active when custom menu starts
		if (!wParam && menuUp)
			return DefWindowProc(hWnd, WM_NCACTIVATE, TRUE, lParam);
		return DefWindowProc(hWnd, message, wParam, lParam);
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hWnd, message, wParam, lParam);
		break;
	}

	return 0;
}


int CALLBACK WinMain(
	_In_ HINSTANCE hInstance,
	_In_opt_ HINSTANCE hPrevInstance,
	_In_ LPSTR     lpCmdLine,
	_In_ int       nCmdShow
) {
	WNDCLASSEX 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, IDI_APPLICATION);
	wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
	wcex.lpszMenuName = NULL;
	wcex.lpszClassName = _T("MenuHolder");
	wcex.hIconSm = LoadIcon(wcex.hInstance, IDI_APPLICATION);


	if (!RegisterClassEx(&wcex))
	{
		MessageBox(NULL,
			_T("Call to RegisterClassEx failed!"),
			_T("Windows Desktop Guided Tour"),
			NULL);

		return 1;
	}
	wcex.cbSize = sizeof(WNDCLASSEX);
	wcex.style = CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc = WndProcMenu;
	wcex.cbClsExtra = 0;
	wcex.cbWndExtra = 0;
	wcex.hInstance = hInstance;
	wcex.hIcon = LoadIcon(hInstance, IDI_APPLICATION);
	wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
	wcex.lpszMenuName = NULL;
	wcex.lpszClassName = _T("MenuWindow");
	wcex.hIconSm = LoadIcon(wcex.hInstance, IDI_APPLICATION);
	if (!RegisterClassEx(&wcex))
	{
		MessageBox(NULL,
			_T("Call to RegisterClassEx failed!"),
			_T("Windows Desktop Guided Tour"),
			NULL);

		return 1;
	}

	static TCHAR szTitle[] = _T("test");

	HWND hWnd = CreateWindow(
		_T("MenuHolder"),
		szTitle,
		WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT, CW_USEDEFAULT,
		500, 100,
		NULL,
		NULL,
		hInstance,
		NULL
	);
	hWndMain = hWnd;

	hWMenu = CreateWindowEx(
		WS_EX_TOOLWINDOW | WS_EX_DLGMODALFRAME | WS_EX_WINDOWEDGE,
		_T("MenuWindow"),
		szTitle,
		WS_POPUP | WS_BORDER,
		0, 0,
		100, 500,
		hWnd,
		NULL,
		hInstance,
		NULL
	);


	if (!hWnd || !hWMenu)
	{
		MessageBox(NULL,
			_T("Call to CreateWindow failed!"),
			_T("Windows Desktop Guided Tour"),
			NULL);

		return 1;
	}

	ShowWindow(hWnd,
		nCmdShow);
	UpdateWindow(hWnd);

	MSG msg;
	while (GetMessage(&msg, NULL, 0, 0))
	{
		bool skip = false;
		if (!skip) {
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}

	return (int)msg.wParam;
}