inputengine.h

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** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
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** This file is part of the Qt Virtual Keyboard module of the Qt Toolkit.
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#ifndef INPUTENGINE_H
#define INPUTENGINE_H

#include <QObject>
#include <QPointer>

namespace QtVirtualKeyboard {

class InputContext;
class SelectionListModel;
class AbstractInputMethod;
class InputEnginePrivate;
class Trace;

class InputEngine : public QObject
{
    Q_OBJECT
    Q_DISABLE_COPY(InputEngine)
    Q_DECLARE_PRIVATE(InputEngine)
    Q_FLAGS(ReselectFlags)
    Q_PROPERTY(Qt::Key activeKey READ activeKey NOTIFY activeKeyChanged)
    Q_PROPERTY(Qt::Key previousKey READ previousKey NOTIFY previousKeyChanged)
    Q_PROPERTY(QtVirtualKeyboard::AbstractInputMethod *inputMethod READ inputMethod WRITE setInputMethod NOTIFY inputMethodChanged)
    Q_PROPERTY(QList<int> inputModes READ inputModes NOTIFY inputModesChanged)
    Q_PROPERTY(InputMode inputMode READ inputMode WRITE setInputMode NOTIFY inputModeChanged)
    Q_PROPERTY(QList<int> patternRecognitionModes READ patternRecognitionModes NOTIFY patternRecognitionModesChanged)
    Q_PROPERTY(QtVirtualKeyboard::SelectionListModel *wordCandidateListModel READ wordCandidateListModel NOTIFY wordCandidateListModelChanged)
    Q_PROPERTY(bool wordCandidateListVisibleHint READ wordCandidateListVisibleHint NOTIFY wordCandidateListVisibleHintChanged)

    explicit InputEngine(InputContext *parent = 0);

public:
    enum TextCase {
        Lower,
        Upper
    };
    enum InputMode {
        Latin,
        Numeric,
        Dialable,
        Pinyin,