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

**

** 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 HbWidgets 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.

**

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

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Hb API.  It exists purely as an

// implementation detail.  This file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include "hblineedit_p.h"

#include "hblineedit.h"

#include "hbmeshlayout_p.h"

#include "hbcolorscheme.h"

#include <QTextDocument>

#include <QTextBlock>

#include <math.h>

// value used if no maximum lines is set

const int DefaulMaximumVisibleLines = 30;

// minimum font size when using stretch font mode

const qreal KMinimumLineHeight = 4.0;

HbLineEditPrivate::HbLineEditPrivate () :

    HbAbstractEditPrivate(),

    maxLength(-1),

    minimumRows(1),

    maximumRows(1),

    echoMode(HbLineEdit::Normal),

    clearOnEdit(false),

    emitTextChanged(true),

    adjustFontSizeToFitHeight(false),

    stretchedToLineCount(-1)

{

}

HbLineEditPrivate::~HbLineEditPrivate ()

{

}

void HbLineEditPrivate::init()

{

    Q_Q(HbLineEdit);

    QObject::connect(q, SIGNAL(selectionChanged(const QTextCursor &, const QTextCursor &)),

                     q, SIGNAL(selectionChanged()));

    QObject::connect(doc, SIGNAL(contentsChange(int,int,int)), q, SLOT(_q_textChange(int,int,int)));

    QObject::connect(q, SIGNAL(contentsChanged()), q, SLOT(_q_textChanged()));

    q->setScrollable(true);

    scrollArea->setHorizontalScrollBarPolicy(HbScrollArea::ScrollBarAlwaysOff); 

    defaultWrapMode = doc->defaultTextOption().wrapMode(); // cannot be changed.

    q->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);

    q->setBackgroundItem(HbStyle::P_LineEdit_frame_normal);

    q->setFocusHighlight(HbStyle::P_LineEdit_frame_highlight,HbWidget::FocusHighlightActive);

    updateWrappingMode();

    Q_ASSERT(scrollArea);

    scrollArea->installEventFilter(q); // needed for resize event processing

}

void HbLineEditPrivate::updatePaletteFromTheme()

{

    HbAbstractEditPrivate::updatePaletteFromTheme();

    Q_Q(HbLineEdit);

    QColor textColor = HbColorScheme::color("qtc_lineedit_normal");

    QColor selectedColor = HbColorScheme::color("qtc_lineedit_selected");

    QColor selectedBackground = HbColorScheme::color("qtc_lineedit_marker_normal");

    QColor hintText = HbColorScheme::color("qtc_lineedit_hint_normal");

    QPalette pal = q->palette();

    if (textColor.isValid()) {

        pal.setColor(QPalette::Text, textColor);

    }

    if (selectedColor.isValid()) {

        pal.setColor(QPalette::HighlightedText, selectedColor);

    }

    if (selectedBackground.isValid()) {

        pal.setColor(QPalette::Highlight, selectedBackground);

    }

    if (hintText.isValid()) {

        pal.setColor(QPalette::NoRole, hintText);

    }

    q->setPalette(pal);

}

bool HbLineEditPrivate::forwardKeyEvent (QKeyEvent *event)

{

    Q_Q(HbLineEdit);

    bool result = true;

    // do not allow key events if at maximum length

    if (maxLength != -1 && q->document()->begin().length() - 1 >= maxLength) {

        if (event->key() != Qt::Key_Left

                && event->key() != Qt::Key_Right

                && event->key() != Qt::Key_Up

                && event->key() != Qt::Key_Down

                && event->key() != Qt::Key_Backspace

                && event->key() != Qt::Key_Delete) {

            result = false;

        }

    }

    // do not allow line feed

    if (event->key() == Qt::Key_Enter || event->key() == Qt::Key_Return) {

        result = false;

    }

    if (result) {

        // Don not allow key events in HbLineEdit::Password or HbLineEdit::NoEcho mode

        if (echoMode == HbLineEdit::Password || echoMode == HbLineEdit::NoEcho) {

            result = false;

        }

    }

    return result;

}

void HbLineEditPrivate::validateMaxLength()

{

    Q_Q(HbLineEdit);

    QString text(q->text());

    if (maxLength >= 0 && (text.length()) > maxLength) {

        text.resize(maxLength);

        QTextCursor cursor(doc);

        cursor.setPosition(maxLength);

        cursor.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);

        cursor.removeSelectedText();

        if(isPasswordMode()) {

            passwordText.resize(maxLength);

        }

    }

}

void HbLineEditPrivate::_q_textChanged()

{

    Q_Q(HbLineEdit);

    if(emitTextChanged && !isPasswordMode()) {

        emit q->textChanged(q->text());

    }

    if(adjustFontSizeToFitHeight) {

        readjustStretchFont();

    }

}

void HbLineEditPrivate::_q_textChange(int position, int charsRemoved,int charsAdded)

{

    Q_UNUSED(position)

    Q_UNUSED(charsRemoved)

    if(charsAdded == 0) return;

    emitTextChanged = false;

    validateMaxLength();

    emitTextChanged = true;

}

void HbLineEditPrivate::updateEditingSize()

{

    Q_Q(HbLineEdit);

    if (scrollArea) {

        if(!adjustFontSizeToFitHeight) {

            const int fontHeight = QFontMetrics(q->font()).height();

            scrollArea->setMinimumHeight(fontHeight * minimumRows + 2 * doc->documentMargin());

            if (maximumRows == 1) {

                scrollArea->setPreferredHeight(fontHeight);

                scrollArea->setScrollDirections(Qt::Horizontal);

            } else {

                scrollArea->setPreferredHeight(doc->documentLayout()->documentSize().height());

                scrollArea->setScrollDirections(Qt::Vertical);

            }

            scrollArea->setMaximumHeight(fontHeight * maximumRows + 2 * doc->documentMargin());

        } else {

            qreal prefLineHeight = q->fontSpec().textHeight();

            if (prefLineHeight<0) {

                QFontMetricsF metrics(q->font());

                prefLineHeight = metrics.lineSpacing();

            }

            const qreal marginBonus = 2*doc->documentMargin();

            scrollArea->setMinimumHeight(qMax(minimumRows,1)*KMinimumLineHeight

                                         +marginBonus);

            // minimumRows is used here because it is expected that

            // text will be short in most use cases

            scrollArea->setPreferredHeight(prefLineHeight*minimumRows+marginBonus);

            scrollArea->setMaximumHeight(QWIDGETSIZE_MAX);

        }

    }

}

bool HbLineEditPrivate::canCopy() const

{

    bool retVal = HbAbstractEditPrivate::canCopy();

    if(echoMode != HbLineEdit::Normal) {

        retVal = false;

    }

    return retVal;

}

bool HbLineEditPrivate::isCursorVisible() const

{

    return HbAbstractEditPrivate::isCursorVisible() &&

            (echoMode == HbLineEdit::Normal || echoMode == HbLineEdit::PasswordEchoOnEdit);

}

void HbLineEditPrivate::prepDocForPaste()

{

    if(echoMode != HbLineEdit::Normal) {

        doc->clear();

        passwordText.clear();

    }

}

void HbLineEditPrivate::setCapitalization ( QFont::Capitalization caps )

{    

    QTextCursor newCursor = QTextCursor(doc);

    newCursor.select(QTextCursor::Document);

    QTextCharFormat textFormat = newCursor.charFormat();

    textFormat.setFontCapitalization(caps);

    newCursor.setCharFormat(textFormat);

    //Merge capitalization to cursor's charformat

    cursor.mergeCharFormat(textFormat);

}

QFont::Capitalization HbLineEditPrivate::capitalization() const

{

    return cursor.charFormat().fontCapitalization();

}

bool HbLineEditPrivate::isPasswordMode() const

{

    return ((echoMode == HbLineEdit::Password) ||

           (echoMode == HbLineEdit::PasswordEchoOnEdit) ||

           (echoMode == HbLineEdit::NoEcho));

}

void HbLineEditPrivate::setEchoMode(HbLineEdit::EchoMode echoMode)

{

    Q_Q(HbLineEdit);

    if(this->echoMode == HbLineEdit::Normal) {

        passwordText = q->toPlainText();

    }

    this->echoMode = echoMode;

    q->setPlainText(echoString(passwordText));

    if(isPasswordMode()){

        q->setCursorPosition(passwordText.length());

    }

}

QString HbLineEditPrivate::passwordString(const QString &text) const

{

    Q_Q(const HbLineEdit);

    int passChar = q->QGraphicsWidget::style()->styleHint(QStyle::SH_LineEdit_PasswordCharacter);

    return QString(text.length(), passChar);

}

QString HbLineEditPrivate::echoString(const QString &text)

{

    Q_Q(HbLineEdit);

    QString retText(text);

    if(echoMode == HbLineEdit::Password || (echoMode == HbLineEdit::PasswordEchoOnEdit && !q->hasFocus())) {

        retText = passwordString(text);

    } else if (echoMode == HbLineEdit::NoEcho) {

        retText.clear();

    } // else Normal

    return retText;

}

void HbLineEditPrivate::updateWrappingMode()

{

    QTextOption option = doc->defaultTextOption();

    if (maximumRows == 1) {

        option.setWrapMode(QTextOption::NoWrap);

    } else {

        option.setWrapMode(defaultWrapMode);

    }

    doc->setDefaultTextOption(option);

}

int HbLineEditPrivate::linesToBeVisible() const

{

    int docLineCount = 0;

    QTextBlock block = doc->firstBlock();

    for (int i=0; i<doc->blockCount(); ++i) {

        docLineCount += block.layout()->lineCount();

        block.next();

    }

    return qBound(minimumRows, docLineCount, maximumRows);

}

void HbLineEditPrivate::readjustStretchFont()

{

    int desiredLineCount=linesToBeVisible();

    if (desiredLineCount==stretchedToLineCount) {

        return;

    }

    setVisibleRows(desiredLineCount);

    if (desiredLineCount<stretchedToLineCount

        && desiredLineCount<linesToBeVisible()) {

        do {

            ++desiredLineCount;

            setVisibleRows(desiredLineCount);

        } while(desiredLineCount<linesToBeVisible());

    }

    stretchedToLineCount = desiredLineCount;

}

void HbLineEditPrivate::onResizeFontChange()

{

    if (!adjustFontSizeToFitHeight) {

        return;

    }

    const int maxRows = (maximumRows>0)?maximumRows:DefaulMaximumVisibleLines;

    for (int i=minimumRows; i<=maxRows; ++i) {

        setVisibleRows(i);

        if(linesToBeVisible()<=i) {

            stretchedToLineCount = i;

            break;

        }

    }

}

void HbLineEditPrivate::setVisibleRows(int rowCount)

{

    Q_Q(HbLineEdit);

    qreal singleLineHeight = scrollArea->size().height()

                             -2*doc->documentMargin();

    if(singleLineHeight<=0) {

        return;

    }

    singleLineHeight/=rowCount;

    HbFontSpec fSpec(q->fontSpec());

    if (fSpec.role()!=HbFontSpec::Undefined) {

        fSpec.setTextHeight(singleLineHeight);

        canvas->setFontSpec(fSpec);

    } else {

        QFont deltaFont;

        deltaFont.setPixelSize(static_cast<int>(singleLineHeight+0.5));

        QFont oldFont = q->font();

        QFontMetricsF metrics(deltaFont.resolve(oldFont));

        //recalculate pixels size to line height

        singleLineHeight = singleLineHeight * singleLineHeight / metrics.lineSpacing();

        deltaFont.setPixelSize(static_cast<int>(singleLineHeight));

        canvas->setFont(deltaFont);

    }

}

#include "moc_hblineedit.cpp"