documenthandler.cpp Example File

  /****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, 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.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/

  #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();
      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
  {
      if (!m_doc)
          return QTextCursor();

      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)
  {
      if (!m_doc)
          return;

      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;
  }