/****************************************************************************

**

** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbPlugins module of the UI Extensions for Mobile.

**

** GNU Lesser General Public License Usage

** This file may be used under the terms of the GNU Lesser General Public

** License version 2.1 as published by the Free Software Foundation and

** appearing in the file LICENSE.LGPL included in the packaging of this file.

** Please review the following information to ensure the GNU Lesser General

** Public License version 2.1 requirements will be met:

** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at developer.feedback@nokia.com.

**

****************************************************************************/

#ifndef hb_input_mode_handler

#define hb_input_mode_handler

#include <QObject>

#include <QStringList>

#include <QChar>

#include <hbinputmodeproperties.h>

#include <hbinputdef.h>

#include <hbinputpredictioncallback.h>

class HbInputAbstractMethod;

class QMouseEvent;

class QTimer;

class HbKeymap;

class QKeyEvent;

class HbInputModeHandlerPrivate;

class HbInputModeHandler: public QObject

{

    Q_OBJECT

public:

    // Set of actions.

    enum HbInputModeAction {

        // mode specific actions

        HbInputModeActionInit, // keymapping initialization, signal connections etc.

        HbInputModeActionReset, // resetting the state of the modehandler

        HbInputModeActionClose, //cleanups like disconnection..!

        // commit actions

        HbInputModeActionCommit, // commits the inline characters if any

        HbInputModeActionDeleteAndCommit,// deletes one character and then commits

        HbInputModeActionPrimaryLanguageChanged, 

        HbInputModeActionSecondaryLanguageChanged, 

        // prediction

        HbInputModeActionSetCandidateList, // sets the candidate list

        HbInputModeActionSetKeypad,//sets the keypad

        HbInputModeActionLaunchCandidatePopup, // launched the candidate popup

        HbInputModeActionHideTail, //Hides the prediction tail

        // autocompletion

        HbInputModeActionSetupAutoCompletion, // setting up of autocompletion

        // focus change

        HbInputModeActionFocusRecieved, // focus recived state

        HbInputModeActionFocusLost, // focus lost state

        HbInputModeActionCancelButtonPress,

		HbInputModeActionCloseSpellQuery

       // more..

    };

    virtual ~HbInputModeHandler();

    // HbInputMethod specific operations.

    virtual bool isComposing() const {return false;}

    virtual void mouseHandler(int x, QMouseEvent* mouseEvent);

    virtual bool filterEvent(const QEvent * event);

    // Utility functions.

    void getAndFilterCharactersBoundToKey(QStringList &list, Qt::Key key);

    virtual void commitAndAppendString(const QString& string);

    virtual void commitAndUpdate(const QString& string, int replaceFrom = 0, int replaceLength = 0, bool isAsync = false);

    void sendAndUpdate(QEvent &event);

    virtual void setKeymap(const HbKeymap* keymap);

	void togglePrediction();

signals:

    // incase one mode handler is not capable of processing the events.

    // it can pass the event by sending following signals. And then it is 

    // upto the plugin to decide which two mode handlers needs to be connected.

    void passFilterEvent(const QKeyEvent *event);

    void passActionHandler(HbInputModeAction action);

public slots:    

    virtual void sctCharacterSelected(QString character);

    // filterEvent function

    virtual bool filterEvent(const QKeyEvent * event);

    // Action handler for HbInputModeAction actions.

    virtual bool actionHandler(HbInputModeAction action);

    virtual void smileySelected(QString smiley);

    virtual void cursorPositionChanged(int oldPos, int newPos);

protected:

    HbInputModeHandlerPrivate* const d_ptr;

    HbInputModeHandler(HbInputModeHandlerPrivate &dd, HbInputAbstractMethod* inputMethod);

private:

    Q_DECLARE_PRIVATE_D(d_ptr, HbInputModeHandler)

    Q_DISABLE_COPY(HbInputModeHandler)

    Q_PRIVATE_SLOT(d_func(), virtual void _q_timeout())

};

// multi tap constant

const int HbMultiTapTimerTimeout = 600;

// shift key states

enum HbInputShiftKeyState {

    EKeyPressedNone,

    EShiftKeyPressed

};

const QString HbAutoCompleteVendorIdString("Nokia HbAutoComplete");

/////////////////////////////////////////////////////////////////////////////////////

////////////////////////////// LATIN BASIC //////////////////////////////////////////

/////////////////////////////////////////////////////////////////////////////////////

class HbInputBasicHandlerPrivate;

class HbInputBasicHandler: public HbInputModeHandler

{

    Q_OBJECT

public:

    HbInputBasicHandler(HbInputAbstractMethod* inputMethod);

    ~HbInputBasicHandler();

    bool actionHandler(HbInputModeAction action);

    bool filterEvent(const QKeyEvent * event);

    // automatic completion apis;

    void setUpAutoCompleter();

    void refreshAutoCompleter();

    void deleteCharacterInAutoCompleter();

    void appendUnicodeCharacterInAutoCompleter(QChar character);

    void addWordInAutoCompleter();

public slots:

    void autoCompletionPopupClosed(QString activatedWord, int closingKey);

    void sctCharacterSelected(QString character);

    void smileySelected(QString character);

protected:

    HbInputBasicHandler(HbInputBasicHandlerPrivate &dd, HbInputAbstractMethod* inputMethod);

private:

    Q_DECLARE_PRIVATE_D(d_ptr, HbInputBasicHandler)

    Q_DISABLE_COPY(HbInputBasicHandler)

};

////////////////////////////////////////////////////////////////////////////////////

////////////////////////////// PREDICTION //////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////////

class HbInputPredictionHandlerPrivate;

class HbInputPredictionHandler: public HbInputModeHandler

{

    Q_OBJECT

public:

    ~HbInputPredictionHandler();

    bool isComposing();

    void mouseHandler(int cursorPosition, QMouseEvent* mouseEvent);

    bool filterEvent(const QKeyEvent * event);

    // engine related information.

    QList<HbInputLanguage> supportedLanguages() const;

    bool actionHandler(HbInputModeAction action);

    // some utility functions

    void appendUnicodeCharacter(QChar character);

    void commitAndAppendCharacter(QChar character);

    virtual void deleteOneCharacter();

    virtual void processExactWord(QString exactWord);

    void commitExactWord();

    virtual void processCustomWord(QString customWord);

    virtual void candidatePopupClosed(QString activatedWord, int closingKey);

    virtual void showExactWordPopupIfNeeded();

public slots:

    // different utility popup callbacks

    virtual void inputQueryPopupClosed(QString activatedWord, int closingKey);    

    void sctCharacterSelected(QString character);

    void smileySelected(QString smiley);

signals://some useful signals related to popups

    void launchInputQueryPopup(QString editWord);

protected:

    HbInputPredictionHandler(HbInputPredictionHandlerPrivate &dd, HbInputAbstractMethod* inputMethod);

private:

    Q_DECLARE_PRIVATE_D(d_ptr, HbInputPredictionHandler)

    Q_DISABLE_COPY(HbInputPredictionHandler)

};

/////////////////////////////////////////////////////////////////////////////////////

////////////////////////////// Numeric //////////////////////////////////////////

/////////////////////////////////////////////////////////////////////////////////////

class HbInputNumericHandlerPrivate;

class HbInputNumericHandler: public HbInputModeHandler

{

    Q_OBJECT

public:

    ~HbInputNumericHandler();

    bool actionHandler(HbInputModeAction action);

    bool filterEvent(const QKeyEvent * event);

protected:

    HbInputNumericHandler(HbInputNumericHandlerPrivate &dd, HbInputAbstractMethod* inputMethod);

private:

    Q_DECLARE_PRIVATE_D(d_ptr, HbInputNumericHandler)

    Q_DISABLE_COPY(HbInputNumericHandler)

};

#endif //hb_input_mode_handler