- Qt 5.5
- Qt Quick Controls
- Qt Quick Controls - Text Editor Example
- documenthandler.cpp Example File
- Qt 5.5.1 Reference Documentation

# documenthandler.cpp Example File

texteditor/src/documenthandler.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
    **   * Neither the name of The Qt Company Ltd nor the names of its
    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    **
    ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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    ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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    #include "documenthandler.h"

    #include <QtGui/QTextDocument>
    #include <QtGui/QTextCursor>
    #include <QtGui/QFontDatabase>
    #include <QtCore/QFileInfo>

    DocumentHandler::DocumentHandler()
        : m_target(0)
        , m_doc(0)
        , m_cursorPosition(-1)
        , m_selectionStart(0)
        , m_selectionEnd(0)
    {
    }

    void DocumentHandler::setTarget(QQuickItem *target)
    {
        m_doc = 0;
        m_target = target;
        if (!m_target)
            return;

        QVariant doc = m_target->property("textDocument");
        if (doc.canConvert<QQuickTextDocument*>()) {
            QQuickTextDocument *qqdoc = doc.value<QQuickTextDocument*>();
            if (qqdoc)
                m_doc = qqdoc->textDocument();
        }
        emit targetChanged();
    }

    void DocumentHandler::setFileUrl(const QUrl &arg)
    {
        if (m_fileUrl != arg) {
            m_fileUrl = arg;
            QString fileName = QQmlFile::urlToLocalFileOrQrc(arg);
            if (QFile::exists(fileName)) {
                QFile file(fileName);
                if (file.open(QFile::ReadOnly)) {
                    QByteArray data = file.readAll();
                    QTextCodec *codec = QTextCodec::codecForHtml(data);
                    setText(codec->toUnicode(data));
                    if (m_doc)
                        m_doc->setModified(false);
                    if (fileName.isEmpty())
                        m_documentTitle = QStringLiteral("untitled.txt");
                    else
                        m_documentTitle = QFileInfo(fileName).fileName();

                    emit textChanged();
                    emit documentTitleChanged();

                    reset();
                }
            }
            emit fileUrlChanged();
        }
    }

    QString DocumentHandler::documentTitle() const
    {
        return m_documentTitle;
    }

    void DocumentHandler::setDocumentTitle(QString arg)
    {
        if (m_documentTitle != arg) {
            m_documentTitle = arg;
            emit documentTitleChanged();
        }
    }

    void DocumentHandler::setText(const QString &arg)
    {
        if (m_text != arg) {
            m_text = arg;
            emit textChanged();
        }
    }

    void DocumentHandler::saveAs(const QUrl &arg, const QString &fileType)
    {
        bool isHtml = fileType.contains(QLatin1String("htm"));
        QLatin1String ext(isHtml ? ".html" : ".txt");
        QString localPath = arg.toLocalFile();
        if (!localPath.endsWith(ext))
            localPath += ext;
        QFile f(localPath);
        if (!f.open(QFile::WriteOnly | QFile::Truncate | (isHtml ? QFile::NotOpen : QFile::Text))) {
            emit error(tr("Cannot save: ") + f.errorString());
            return;
        }
        f.write((isHtml ? m_doc->toHtml() : m_doc->toPlainText()).toLocal8Bit());
        f.close();
        qDebug() << "saved to" << localPath;
        setFileUrl(QUrl::fromLocalFile(localPath));
    }

    QUrl DocumentHandler::fileUrl() const
    {
        return m_fileUrl;
    }

    QString DocumentHandler::text() const
    {
        return m_text;
    }

    void DocumentHandler::setCursorPosition(int position)
    {
        if (position == m_cursorPosition)
            return;

        m_cursorPosition = position;

        reset();
    }

    void DocumentHandler::reset()
    {
        emit fontFamilyChanged();
        emit alignmentChanged();
        emit boldChanged();
        emit italicChanged();
        emit underlineChanged();
        emit fontSizeChanged();
        emit textColorChanged();
    }

    QTextCursor DocumentHandler::textCursor() const
    {
        QTextCursor cursor = QTextCursor(m_doc);
        if (m_selectionStart != m_selectionEnd) {
            cursor.setPosition(m_selectionStart);
            cursor.setPosition(m_selectionEnd, QTextCursor::KeepAnchor);
        } else {
            cursor.setPosition(m_cursorPosition);
        }
        return cursor;
    }

    void DocumentHandler::mergeFormatOnWordOrSelection(const QTextCharFormat &format)
    {
        QTextCursor cursor = textCursor();
        if (!cursor.hasSelection())
            cursor.select(QTextCursor::WordUnderCursor);
        cursor.mergeCharFormat(format);
    }

    void DocumentHandler::setSelectionStart(int position)
    {
        m_selectionStart = position;
    }

    void DocumentHandler::setSelectionEnd(int position)
    {
        m_selectionEnd = position;
    }

    void DocumentHandler::setAlignment(Qt::Alignment a)
    {
        QTextBlockFormat fmt;
        fmt.setAlignment((Qt::Alignment) a);
        QTextCursor cursor = QTextCursor(m_doc);
        cursor.setPosition(m_selectionStart, QTextCursor::MoveAnchor);
        cursor.setPosition(m_selectionEnd, QTextCursor::KeepAnchor);
        cursor.mergeBlockFormat(fmt);
        emit alignmentChanged();
    }

    Qt::Alignment DocumentHandler::alignment() const
    {
        QTextCursor cursor = textCursor();
        if (cursor.isNull())
            return Qt::AlignLeft;
        return textCursor().blockFormat().alignment();
    }

    bool DocumentHandler::bold() const
    {
        QTextCursor cursor = textCursor();
        if (cursor.isNull())
            return false;
        return textCursor().charFormat().fontWeight() == QFont::Bold;
    }

    bool DocumentHandler::italic() const
    {
        QTextCursor cursor = textCursor();
        if (cursor.isNull())
            return false;
        return textCursor().charFormat().fontItalic();
    }

    bool DocumentHandler::underline() const
    {
        QTextCursor cursor = textCursor();
        if (cursor.isNull())
            return false;
        return textCursor().charFormat().fontUnderline();
    }

    void DocumentHandler::setBold(bool arg)
    {
        QTextCharFormat fmt;
        fmt.setFontWeight(arg ? QFont::Bold : QFont::Normal);
        mergeFormatOnWordOrSelection(fmt);
        emit boldChanged();
    }

    void DocumentHandler::setItalic(bool arg)
    {
        QTextCharFormat fmt;
        fmt.setFontItalic(arg);
        mergeFormatOnWordOrSelection(fmt);
        emit italicChanged();
    }

    void DocumentHandler::setUnderline(bool arg)
    {
        QTextCharFormat fmt;
        fmt.setFontUnderline(arg);
        mergeFormatOnWordOrSelection(fmt);
        emit underlineChanged();
    }

    int DocumentHandler::fontSize() const
    {
        QTextCursor cursor = textCursor();
        if (cursor.isNull())
            return 0;
        QTextCharFormat format = cursor.charFormat();
        return format.font().pointSize();
    }

    void DocumentHandler::setFontSize(int arg)
    {
        QTextCursor cursor = textCursor();
        if (cursor.isNull())
            return;
        QTextCharFormat format;
        format.setFontPointSize(arg);
        mergeFormatOnWordOrSelection(format);
        emit fontSizeChanged();
    }

    QColor DocumentHandler::textColor() const
    {
        QTextCursor cursor = textCursor();
        if (cursor.isNull())
            return QColor(Qt::black);
        QTextCharFormat format = cursor.charFormat();
        return format.foreground().color();
    }

    void DocumentHandler::setTextColor(const QColor &c)
    {
        QTextCursor cursor = textCursor();
        if (cursor.isNull())
            return;
        QTextCharFormat format;
        format.setForeground(QBrush(c));
        mergeFormatOnWordOrSelection(format);
        emit textColorChanged();
    }

    QString DocumentHandler::fontFamily() const
    {
        QTextCursor cursor = textCursor();
        if (cursor.isNull())
            return QString();
        QTextCharFormat format = cursor.charFormat();
        return format.font().family();
    }

    void DocumentHandler::setFontFamily(const QString &arg)
    {
        QTextCursor cursor = textCursor();
        if (cursor.isNull())
            return;
        QTextCharFormat format;
        format.setFontFamily(arg);
        mergeFormatOnWordOrSelection(format);
        emit fontFamilyChanged();
    }

    QStringList DocumentHandler::defaultFontSizes() const
    {
        // uhm... this is quite ugly
        QStringList sizes;
        QFontDatabase db;
        foreach (int size, db.standardSizes())
            sizes.append(QString::number(size));
        return sizes;
    }