src/hbwidgets/editors/hblineedit_p.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 27 May 2010 13:10:59 +0300
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permissions -rw-r--r--
Revision: 201019 Kit: 2010121
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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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//
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//  W A R N I N G
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//  -------------
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//
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// This file is not part of the Hb API.  It exists purely as an
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// implementation detail.  This file may change from version to
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// version without notice, or even be removed.
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//
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// We mean it.
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//
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#include "hblineedit_p.h"
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#include "hblineedit.h"
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#include "hbmeshlayout_p.h"
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#include "hbcolorscheme.h"
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#include <QTextDocument>
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#include <QTextBlock>
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#include <math.h>
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// value used if no maximum lines is set
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const int DefaulMaximumVisibleLines = 30;
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// minimum font size when using stretch font mode
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const qreal KMinimumLineHeight = 4.0;
0
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HbLineEditPrivate::HbLineEditPrivate () :
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    HbAbstractEditPrivate(),
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    maxLength(-1),
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    minimumRows(1),
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    maximumRows(1),
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    echoMode(HbLineEdit::Normal),
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    clearOnEdit(false),
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    emitTextChanged(true),
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    adjustFontSizeToFitHeight(false),
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    stretchedToLineCount(-1)
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{
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}
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HbLineEditPrivate::~HbLineEditPrivate ()
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{
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}
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void HbLineEditPrivate::init()
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{
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    Q_Q(HbLineEdit);
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    QObject::connect(q, SIGNAL(selectionChanged(const QTextCursor &, const QTextCursor &)),
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                     q, SIGNAL(selectionChanged()));
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    QObject::connect(doc, SIGNAL(contentsChange(int,int,int)), q, SLOT(_q_textChange(int,int,int)));
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    QObject::connect(q, SIGNAL(contentsChanged()), q, SLOT(_q_textChanged()));
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    q->setScrollable(true);
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    scrollArea->setHorizontalScrollBarPolicy(HbScrollArea::ScrollBarAlwaysOff); 
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    defaultWrapMode = doc->defaultTextOption().wrapMode(); // cannot be changed.
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    q->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
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    q->setBackgroundItem(HbStyle::P_LineEdit_frame_normal);
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    q->setFocusHighlight(HbStyle::P_LineEdit_frame_highlight,HbWidget::FocusHighlightActive);
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    updateWrappingMode();
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    Q_ASSERT(scrollArea);
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    scrollArea->installEventFilter(q); // needed for resize event processing
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}
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void HbLineEditPrivate::updatePaletteFromTheme()
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{
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    HbAbstractEditPrivate::updatePaletteFromTheme();
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    Q_Q(HbLineEdit);
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    QColor textColor = HbColorScheme::color("qtc_lineedit_normal");
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    QColor selectedColor = HbColorScheme::color("qtc_lineedit_selected");
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    QColor selectedBackground = HbColorScheme::color("qtc_lineedit_marker_normal");
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    QColor hintText = HbColorScheme::color("qtc_lineedit_hint_normal");
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    QPalette pal = q->palette();
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    if (textColor.isValid()) {
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        pal.setColor(QPalette::Text, textColor);
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    }
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    if (selectedColor.isValid()) {
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        pal.setColor(QPalette::HighlightedText, selectedColor);
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    }
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    if (selectedBackground.isValid()) {
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        pal.setColor(QPalette::Highlight, selectedBackground);
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    }
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    if (hintText.isValid()) {
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        pal.setColor(QPalette::NoRole, hintText);
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    }
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0
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    q->setPalette(pal);
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}
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bool HbLineEditPrivate::forwardKeyEvent (QKeyEvent *event)
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{
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    Q_Q(HbLineEdit);
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    bool result = true;
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    // do not allow key events if at maximum length
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    if (maxLength != -1 && q->document()->begin().length() - 1 >= maxLength) {
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        if (event->key() != Qt::Key_Left
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                && event->key() != Qt::Key_Right
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                && event->key() != Qt::Key_Up
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                && event->key() != Qt::Key_Down
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                && event->key() != Qt::Key_Backspace
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                && event->key() != Qt::Key_Delete) {
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            result = false;
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        }
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    }
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    // do not allow line feed
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    if (event->key() == Qt::Key_Enter || event->key() == Qt::Key_Return) {
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        result = false;
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    }
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    if (result) {
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        // Don not allow key events in HbLineEdit::Password or HbLineEdit::NoEcho mode
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        if (echoMode == HbLineEdit::Password || echoMode == HbLineEdit::NoEcho) {
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            result = false;
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        }
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    }
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    return result;
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}
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   151
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void HbLineEditPrivate::validateMaxLength()
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{
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    Q_Q(HbLineEdit);
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    QString text(q->text());
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    if (maxLength >= 0 && (text.length()) > maxLength) {
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        text.resize(maxLength);
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        QTextCursor cursor(doc);
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        cursor.setPosition(maxLength);
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        cursor.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);
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        cursor.removeSelectedText();
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        if(isPasswordMode()) {
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            passwordText.resize(maxLength);
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        }
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    }
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}
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   168
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void HbLineEditPrivate::_q_textChanged()
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{
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    Q_Q(HbLineEdit);
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    if(emitTextChanged && !isPasswordMode()) {
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        emit q->textChanged(q->text());
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    }
1
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diff changeset
   176
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    if(adjustFontSizeToFitHeight) {
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        readjustStretchFont();
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    }
0
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}
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   181
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void HbLineEditPrivate::_q_textChange(int position, int charsRemoved,int charsAdded)
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{
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    Q_UNUSED(position)
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    Q_UNUSED(charsRemoved)
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   186
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    if(charsAdded == 0) return;
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   188
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    emitTextChanged = false;
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    validateMaxLength();
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    emitTextChanged = true;
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}
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   193
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void HbLineEditPrivate::updateEditingSize()
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{
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    Q_Q(HbLineEdit);
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    if (scrollArea) {
1
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        if(!adjustFontSizeToFitHeight) {
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            const int fontHeight = QFontMetrics(q->font()).height();
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            scrollArea->setMinimumHeight(fontHeight * minimumRows + 2 * doc->documentMargin());
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   201
            if (maximumRows == 1) {
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                scrollArea->setPreferredHeight(fontHeight);
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                scrollArea->setScrollDirections(Qt::Horizontal);
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   204
            } else {
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                scrollArea->setPreferredHeight(doc->documentLayout()->documentSize().height());
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                scrollArea->setScrollDirections(Qt::Vertical);
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            }
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   208
            scrollArea->setMaximumHeight(fontHeight * maximumRows + 2 * doc->documentMargin());
0
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   209
        } else {
1
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            qreal prefLineHeight = q->fontSpec().textHeight();
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   211
            if (prefLineHeight<0) {
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   212
                QFontMetricsF metrics(q->font());
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   213
                prefLineHeight = metrics.lineSpacing();
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   214
            }
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diff changeset
   215
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            const qreal marginBonus = 2*doc->documentMargin();
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   217
            scrollArea->setMinimumHeight(qMax(minimumRows,1)*KMinimumLineHeight
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                                         +marginBonus);
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diff changeset
   219
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            // minimumRows is used here because it is expected that
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            // text will be short in most use cases
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            scrollArea->setPreferredHeight(prefLineHeight*minimumRows+marginBonus);
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diff changeset
   223
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            scrollArea->setMaximumHeight(QWIDGETSIZE_MAX);
0
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        }
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    }
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}
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bool HbLineEditPrivate::canCopy() const
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{
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    bool retVal = HbAbstractEditPrivate::canCopy();
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    if(echoMode != HbLineEdit::Normal) {
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        retVal = false;
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    }
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    return retVal;
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}
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bool HbLineEditPrivate::isCursorVisible() const
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{
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    return HbAbstractEditPrivate::isCursorVisible() &&
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            (echoMode == HbLineEdit::Normal || echoMode == HbLineEdit::PasswordEchoOnEdit);
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}
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void HbLineEditPrivate::prepDocForPaste()
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{
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    if(echoMode != HbLineEdit::Normal) {
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        doc->clear();
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        passwordText.clear();
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    }
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}
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void HbLineEditPrivate::setCapitalization ( QFont::Capitalization caps )
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{    
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    QTextCursor newCursor = QTextCursor(doc);
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    newCursor.select(QTextCursor::Document);
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    QTextCharFormat textFormat = newCursor.charFormat();
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    textFormat.setFontCapitalization(caps);
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    newCursor.setCharFormat(textFormat);
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    //Merge capitalization to cursor's charformat
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    cursor.mergeCharFormat(textFormat);
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}
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QFont::Capitalization HbLineEditPrivate::capitalization() const
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{
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    return cursor.charFormat().fontCapitalization();
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}
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bool HbLineEditPrivate::isPasswordMode() const
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{
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    return ((echoMode == HbLineEdit::Password) ||
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           (echoMode == HbLineEdit::PasswordEchoOnEdit) ||
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           (echoMode == HbLineEdit::NoEcho));
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}
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void HbLineEditPrivate::setEchoMode(HbLineEdit::EchoMode echoMode)
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{
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    Q_Q(HbLineEdit);
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    if(this->echoMode == HbLineEdit::Normal) {
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        passwordText = q->toPlainText();
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    }
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    this->echoMode = echoMode;
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    q->setPlainText(echoString(passwordText));
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    if(isPasswordMode()){
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        q->setCursorPosition(passwordText.length());
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    }
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}
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QString HbLineEditPrivate::passwordString(const QString &text) const
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{
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    Q_Q(const HbLineEdit);
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    int passChar = q->QGraphicsWidget::style()->styleHint(QStyle::SH_LineEdit_PasswordCharacter);
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    return QString(text.length(), passChar);
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}
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   297
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QString HbLineEditPrivate::echoString(const QString &text)
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{
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    Q_Q(HbLineEdit);
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   301
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    QString retText(text);
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    if(echoMode == HbLineEdit::Password || (echoMode == HbLineEdit::PasswordEchoOnEdit && !q->hasFocus())) {
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        retText = passwordString(text);
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   306
    } else if (echoMode == HbLineEdit::NoEcho) {
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   307
        retText.clear();
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   308
    } // else Normal
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   309
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    return retText;
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}
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   312
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void HbLineEditPrivate::updateWrappingMode()
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{
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    QTextOption option = doc->defaultTextOption();
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    if (maximumRows == 1) {
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        option.setWrapMode(QTextOption::NoWrap);
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   318
    } else {
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        option.setWrapMode(defaultWrapMode);
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    }
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    doc->setDefaultTextOption(option);
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}
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   323
1
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   324
int HbLineEditPrivate::linesToBeVisible() const
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   325
{
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   326
    int docLineCount = 0;
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   327
    QTextBlock block = doc->firstBlock();
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   328
    for (int i=0; i<doc->blockCount(); ++i) {
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   329
        docLineCount += block.layout()->lineCount();
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diff changeset
   330
        block.next();
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   331
    }
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   332
    return qBound(minimumRows, docLineCount, maximumRows);
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diff changeset
   333
}
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diff changeset
   334
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diff changeset
   335
void HbLineEditPrivate::readjustStretchFont()
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   336
{
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   337
    int desiredLineCount=linesToBeVisible();
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diff changeset
   338
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diff changeset
   339
    if (desiredLineCount==stretchedToLineCount) {
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   340
        return;
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   341
    }
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diff changeset
   342
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   343
    setVisibleRows(desiredLineCount);
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diff changeset
   344
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   345
    if (desiredLineCount<stretchedToLineCount
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   346
        && desiredLineCount<linesToBeVisible()) {
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   347
        do {
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   348
            ++desiredLineCount;
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   349
            setVisibleRows(desiredLineCount);
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   350
        } while(desiredLineCount<linesToBeVisible());
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   351
    }
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   352
    stretchedToLineCount = desiredLineCount;
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   353
}
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diff changeset
   354
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   355
void HbLineEditPrivate::onResizeFontChange()
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   356
{
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   357
    if (!adjustFontSizeToFitHeight) {
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   358
        return;
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   359
    }
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diff changeset
   360
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   361
    const int maxRows = (maximumRows>0)?maximumRows:DefaulMaximumVisibleLines;
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   362
    for (int i=minimumRows; i<=maxRows; ++i) {
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   363
        setVisibleRows(i);
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diff changeset
   364
        if(linesToBeVisible()<=i) {
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diff changeset
   365
            stretchedToLineCount = i;
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diff changeset
   366
            break;
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diff changeset
   367
        }
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diff changeset
   368
    }
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diff changeset
   369
}
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diff changeset
   370
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diff changeset
   371
void HbLineEditPrivate::setVisibleRows(int rowCount)
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diff changeset
   372
{
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   373
    Q_Q(HbLineEdit);
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diff changeset
   374
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diff changeset
   375
    qreal singleLineHeight = scrollArea->size().height()
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diff changeset
   376
                             -2*doc->documentMargin();
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diff changeset
   377
    if(singleLineHeight<=0) {
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diff changeset
   378
        return;
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diff changeset
   379
    }
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diff changeset
   380
    singleLineHeight/=rowCount;
f7ac710697a9 Revision: 201015
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diff changeset
   381
f7ac710697a9 Revision: 201015
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diff changeset
   382
    HbFontSpec fSpec(q->fontSpec());
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diff changeset
   383
    if (fSpec.role()!=HbFontSpec::Undefined) {
f7ac710697a9 Revision: 201015
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   384
        fSpec.setTextHeight(singleLineHeight);
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diff changeset
   385
        canvas->setFontSpec(fSpec);
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diff changeset
   386
    } else {
f7ac710697a9 Revision: 201015
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diff changeset
   387
        QFont deltaFont;
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diff changeset
   388
        deltaFont.setPixelSize(static_cast<int>(singleLineHeight+0.5));
f7ac710697a9 Revision: 201015
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diff changeset
   389
        QFont oldFont = q->font();
f7ac710697a9 Revision: 201015
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diff changeset
   390
        QFontMetricsF metrics(deltaFont.resolve(oldFont));
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diff changeset
   391
        //recalculate pixels size to line height
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diff changeset
   392
        singleLineHeight = singleLineHeight * singleLineHeight / metrics.lineSpacing();
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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diff changeset
   393
        deltaFont.setPixelSize(static_cast<int>(singleLineHeight));
f7ac710697a9 Revision: 201015
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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diff changeset
   394
        canvas->setFont(deltaFont);
f7ac710697a9 Revision: 201015
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diff changeset
   395
    }
f7ac710697a9 Revision: 201015
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diff changeset
   396
}
f7ac710697a9 Revision: 201015
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diff changeset
   397
0
16d8024aca5e Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   398
#include "moc_hblineedit.cpp"