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++ // 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 }
++ */