Qt 5.7 | Qt Quick Controls | Qt Quick Controls - Text Editor Example | documenthandler.cpp Example File

Qt 5.7.1 Reference Documentation

# documenthandler.cpp Example File

texteditor/src/documenthandler.cpp

      /****************************************************************************
      **
      ** 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;
      }