openFrameworks / Windows / setBorderless window app

ofApp.h

#if defined(TARGET_WIN32)
	//--------------------------------------------------------------
	void setBorderless(bool b) {
		bNoBorder = b;

		// https://stackoverflow.com/questions/2398746/removing-window-border
		if (bNoBorder)
		{
			// Hide borders

			HWND W = GetActiveWindow();

			LONG lStyle = GetWindowLong(W, GWL_STYLE);
			lStyle &= ~(WS_CAPTION | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_SYSMENU);
			SetWindowLong(W, GWL_STYLE, lStyle);

			LONG lExStyle = GetWindowLong(W, GWL_EXSTYLE);
			lExStyle &= ~(WS_EX_DLGMODALFRAME | WS_EX_CLIENTEDGE | WS_EX_STATICEDGE);
			SetWindowLong(W, GWL_EXSTYLE, lExStyle);

			SetWindowPos(W, NULL, 0, 0, 0, 0, SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_NOOWNERZORDER);
		}
		else
		{
			// Show borders

			HWND W = GetActiveWindow();

			LONG lStyle = GetWindowLong(W, GWL_STYLE);
			lStyle = WS_OVERLAPPEDWINDOW | WS_THICKFRAME | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX | WS_MAXIMIZEBOX;SetWindowLong(W, GWL_STYLE, lStyle);
                        SetWindowLong(W, GWL_STYLE, lStyle);

			LONG lExStyle = GetWindowLong(W, GWL_EXSTYLE);
			lExStyle &= ~(WS_EX_DLGMODALFRAME | WS_EX_CLIENTEDGE | WS_EX_STATICEDGE);
			SetWindowLong(W, GWL_EXSTYLE, lExStyle);

			SetWindowPos(W, NULL, 0, 0, 0, 0, SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_NOOWNERZORDER);

			ShowWindow(W, SW_SHOW);
		}
	};
#endif