/******************************************************************************
 * QSkinny - Copyright (C) 2016 Uwe Rathmann
 * This file may be used under the terms of the QSkinny License, Version 1.0
 *****************************************************************************/

#ifndef QSK_INPUT_CONTEXT_H
#define QSK_INPUT_CONTEXT_H

#include "QskGlobal.h"
#include <QObject>
#include <Qt>
#include <memory>

class QskTextPredictor;
class QskInputPanel;
class QskInputEngine;
class QskPopup;
class QskWindow;
class QQuickItem;

class QSK_EXPORT QskInputContextFactory : public QObject
{
    Q_OBJECT

public:
    QskInputContextFactory( QObject* parent = nullptr );
    virtual ~QskInputContextFactory();

    virtual QskTextPredictor* createPredictor( const QLocale& ) const;
    virtual QskInputPanel* createPanel() const;
};

class QSK_EXPORT QskInputContext : public QObject
{
    Q_OBJECT

    using Inherited = QObject;

public:
    QskInputContext();
    virtual ~QskInputContext();

    void setFactory( QskInputContextFactory* );
    QskInputContextFactory* factory() const;

    QRectF panelRect() const;

    void setActive( bool );
    bool isActive() const;

    QLocale locale() const;

    QQuickItem* inputItem() const;

    static QskInputContext* instance();
    static void setInstance( QskInputContext* );

    QskTextPredictor* textPredictor( const QLocale& locale );

Q_SIGNALS:
    void activeChanged();
    void panelRectChanged();

protected:
    virtual bool eventFilter( QObject*, QEvent* ) override;

    virtual QskPopup* createEmbeddingPopup( QskInputPanel* );
    virtual QskWindow* createEmbeddingWindow( QskInputPanel* );

    virtual void showPanel();
    virtual void hidePanel();

private:
    friend class QskPlatformInputContext;

    // called from QskPlatformInputContext
    void setFocusObject( QObject* );
    void update( const QQuickItem*, Qt::InputMethodQueries );
    void processClickAt( int cursorPosition );
    void commitPrediction( bool );

    void ensurePanel();

    class PrivateData;
    std::unique_ptr< PrivateData > m_data;
};

#endif