src/hbwidgets/editors/hbvalidator.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 11 Jun 2010 13:58:22 +0300
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Revision: 201021 Kit: 2010123
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/****************************************************************************
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**
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** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (developer.feedback@nokia.com)
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**
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** This file is part of the HbWidgets module of the UI Extensions for Mobile.
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**
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this file.
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** Please review the following information to ensure the GNU Lesser General
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** Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at developer.feedback@nokia.com.
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**
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****************************************************************************/
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#include "hbvalidator.h"
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#include "hbvalidator_p.h"
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#include <QTextCursor>
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#include <QDebug>
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#include <QRegExp>
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#include <QRegExpValidator>
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#include <QTextDocument>
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#include <QPair>
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#ifdef HBVALIDATOR_DEBUG_ENABLE
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#define VALIDATORDEBUG(x) d->printFields(x)
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#else
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#define VALIDATORDEBUG(x)
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#endif
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/*!
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\class HbValidator
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\brief Provides validation services for \ref HbAbstractEdit derived editors.
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@proto
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Validators are a kind of programmable elements to restrict what sort of input user can enter in an editor. 
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It provides fields which can contain different types of data, which can be separately validated by QValidator.
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Fields are separated by a string (see addField and setDefaultSeparator).
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\section usage Creating validating editors
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Example for simple integer validator. This can be used to validate IPv4 addresses. 
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\code
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#include <hbvalidator.h>
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HbValidator *validator = new HbValidator();
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validator->setDefaultSeparator(".");
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validator->addField(new QIntValidator(0, 255, 0), "0");
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validator->addField(new QIntValidator(0, 255, 0), "0");
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validator->addField(new QIntValidator(0, 255, 0), "0");
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validator->addField(new QIntValidator(0, 255, 0), "0");
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editor->setValidator(validator);
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\endcode
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\ref HbValidator can also be subclassed to build even more complex validators.
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*/
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/*!
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    Constructs a HbValidator object with a \a parent
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*/
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HbValidator::HbValidator(QObject* parent) :
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    QObject(parent), d_ptr(new HbValidatorPrivate())
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{
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    Q_D(HbValidator);
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    d->q_ptr = this;
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}
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HbValidator::HbValidator(HbValidatorPrivate &dd, QObject* parent) :
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    QObject(parent), d_ptr(&dd)
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{
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    Q_D(HbValidator);
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    d->q_ptr = this;
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}
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/*!
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    Destructor
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*/
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HbValidator::~HbValidator()
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{
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    Q_D(HbValidator);
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    d->clear();
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    delete d;
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}
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/*!
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    returns default value for QTextDocument as a plain text. This value is build using 
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    separators and default values of fields \sa addField \sa setDefaultSeparator
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*/
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QString HbValidator::defaultValue()
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{
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    Q_D(HbValidator);
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    QString result;
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    foreach(HbValidatorField *field, d->fields) {
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        result.append(field->mDefaultValue);
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        result.append(field->mNextSeparator);
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    }
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    return result;
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}
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/*!
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    sets string which will be used as separator when adding new field(s). 
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    This string should be unique comparing to previews field. For example separators 
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    "." or "," should be used after field with floating point numbers (since this 
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    separators are treated as decimal separators depending on locale).
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    \a str contains separator to used i next call of addField
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    Example of IP address validation:
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    \snippet{ultimatecodesnippet/ultimatecodesnippet.cpp,33}
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    \sa addField
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    \sa defaultSeparator()
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 */
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void HbValidator::setDefaultSeparator(const QString &str)
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{
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    if(!str.isEmpty()) {
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        Q_D(HbValidator);
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        d->separatorToAdd = str;
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    }
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}
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/*!
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    returns string which is used as separator when adding new field(s).
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    \sa setDefaultSeparator
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    \sa addField
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*/
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QString HbValidator::defaultSeparator()
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{
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    Q_D(HbValidator);
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    return d->separatorToAdd;
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}
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/*!
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    returns string for separator of specyfied index (index of field before separator).
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    Index can be from 0 to number of fields -2 (nuber of fields-1 is current nuber of
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    separators in use)
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    \a index index separator or index (field index before separator)
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    \return separator after field with index
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*/
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QString HbValidator::separatorAt(int index)
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{
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    Q_D(HbValidator);
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    if(index<0 || index >= d->fields.count() ) {
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        return QString(); // out of range return empty string
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    }
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    return d->fields.at(index)->mNextSeparator;
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}
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/*!
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    Appends QValidator field to HbValidator.
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    This function adds normal editable field to validator. Field consist of QValidator and default value. Field's
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    default value is used when validator initialized and document content is invalid or empty in initialization phase.
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    Field is validated against validator when a change happens in field content.
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    In case it is not first field in HbValidator default separatpor is added (see setDefaultSeparator) before new field.
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    \a validator is used to validate field content. Ownership of validator is passed to HbValidator
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    \a defaultValue is a string that is used in validator initialization phase. defaultValue is used field content if
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        fields and separators can't be created from current document content.
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    Simplest example:
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    \snippet{ultimatecodesnippet/ultimatecodesnippet.cpp,32}
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    \sa setDefaultSeparator
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 */
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void HbValidator::addField(QValidator *validator, const QString &defaultValue)
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{
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    Q_D(HbValidator);
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    validator->setParent(this);
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    d->addField(d->separatorToAdd, validator, defaultValue);
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}
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/*!
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    Appends QValidator field to HbValidator
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    This method is added for convieniece.
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    In case it is not first field in validator separator (separatorBeforeField) is added before new field.
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    If separatorBeforeField is empty default separator is used.
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    \a separatorBeforeField - separator to be added before new field (if epmty default value is used)
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    \a validator is used to validate field content. Ownership of validator is passed to HbValidator
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    \a defaultValue is a string that is used in validator initialization phase. defaultValue is used field content if
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        fields and separators can't be created from current document content.
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    Chess move example:
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    \snippet{ultimatecodesnippet/ultimatecodesnippet.cpp,34}
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    \sa addField(QValidator *, const QString &)
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 */
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void HbValidator::addField(const QString &separatorBeforeField, QValidator *validator, const QString &defaultValue)
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{
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    Q_D(HbValidator);
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    validator->setParent(this);
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    if(separatorBeforeField.isEmpty()) {
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        d->addField(d->separatorToAdd, validator, defaultValue);
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    } else {
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        d->addField(separatorBeforeField, validator, defaultValue);
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    }
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}
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/*!
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    Validates the content
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    @proto
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    Can alter the content of the document, and cursor parameters.
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    \a cursor QTextCursor pointing to document which will be validated
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    \a changePosition is the position where the change begins (currently ignored)
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    \a changeCharsRemoved if characters were removed, this is the count how many (currently ignored)
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    \a changeCharsAdded if characters were added, this is the count how many (currently ignored)
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 */
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QValidator::State HbValidator::validateContent(QTextCursor& cursor, int changePosition, int changeCharsRemoved, int changeCharsAdded)
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{
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    Q_D(HbValidator);
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    Q_UNUSED(changePosition);
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    Q_UNUSED(changeCharsRemoved);
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    Q_UNUSED(changeCharsAdded);
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    if(cursor.isNull()) {
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        return QValidator::Invalid;
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    }
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    return d->validateText(cursor.document());
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}
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// #define HBVALIDATOR_REPORTS
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/*!
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    Validates the cursor position.
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    @proto
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    \a oldCursor is QTextCursor before cursor movement
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    \a newCursor is the new QTextCursor that tells the current cursor state
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    \a source tells the source of cursor position change
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 */
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void HbValidator::validateCursorPosition(const QTextCursor &oldCursor, QTextCursor &newCursor, HbValidator::ChangeSource source)
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 {
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    Q_D(HbValidator);
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#ifdef HBVALIDATOR_REPORTS
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    qDebug() << "oldCursor("<<oldCursor.anchor()<<','<<oldCursor.position()<< "): "<<oldCursor.selectedText()
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             << "\tnewCursor("<<newCursor.anchor()<<','<<newCursor.position()<< "): "<<newCursor.selectedText();
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#endif
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    int newFieldIndex = d->findFieldIndexUnderCursorPos(newCursor);
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    if(newFieldIndex<0) {
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        return;
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    }
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    if(source == CursorChangeFromContentUpdate ) {
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        return;
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    }
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    int oldFieldIndex = d->findFieldIndexUnderCursorPos(oldCursor);
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    if(newFieldIndex!=oldFieldIndex) { // cursor is jumping to new field
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        d->highlightField(&newCursor,newFieldIndex);
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        return;
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    }
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    Q_ASSERT(oldFieldIndex>=0);
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    if(source == CursorChangeFromOperation && d->fieldHasSelection(oldFieldIndex, oldCursor) ) {
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        if(oldCursor.anchor()==newCursor.position()) {
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            if( newFieldIndex>0 ) {
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                d->highlightField( &newCursor, newFieldIndex-1 );
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            }
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        } else if(oldCursor.position()==newCursor.position()) {
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            if( newFieldIndex+1 < d->fields.count() ) {
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                d->highlightField( &newCursor, newFieldIndex+1 );
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            }
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        }
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    }
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 }
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/*!
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    This function can be used for updating cursor position after content validation.
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    Default implementation is empty. QTextCursor given as a parameter can be used 
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    to change cursor position.
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    method is considered to be deleted or reused in a bit different context.
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 */
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void HbValidator::updateTextCursor(QTextCursor &cursor)
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{
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    Q_UNUSED(cursor);
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}