// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only

/*!
    \example calculator
    \title SCXML Calculator
    \examplecategory {Data Processing & I/O}
    \ingroup examples-qtscxml
    \meta tag {state machine}

    \image calculator.png
           {Calculator with numeric display, operator buttons, and digit buttons}

    \brief An application that implements the Calculator example
    presented in the SCXML Specification.

    \e {Calculator} uses Qt SCXML to implement the
    \l{SCXML Specification - Calculator Example}{Calculator Example}
    presented in the SCXML Specification.

    The state machine is specified in the \e statemachine.scxml file and
    compiled into the \c CalculatorStateMachine class. The user interface is
    created using Qt Quick.

    \include examples-run.qdocinc

    \section1 Instantiating the State Machine

    We make the generated \c CalculatorStateMachine class available to QML by
    declaring it as a QML type in the \e calculator-qml.h file:

    \quotefromfile calculator/calculator-qml.h
    \skipto struct
    \printuntil }

    We instantiate a CalculatorStateMachine and listen to the \c updateDisplay
    event. When it occurs, we change the text on the calculator display:

    \quotefromfile calculator/MainWindow.qml
    \skipto  CalculatorStateMachine {
    \printuntil /^ {4}\}/

    When users press the calculator buttons, the buttons submit events to the
    state machine:

    \skipto DIGIT.
    \skipto Button
    \printuntil }
*/
