window.cpp Example File | Qt SVG 5.6

Qt 5.6 | Qt SVG | Text Object Example | window.cpp Example File

Qt 5.6.2 Reference Documentation

# window.cpp Example File

richtext/textobject/window.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.
      **
      **
      ** 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 <QtWidgets>
      #include <QtSvg>

      #include "window.h"
      #include "svgtextobject.h"

      Window::Window()
      {
          setupGui();
          setupTextObject();

          setWindowTitle("Text Object Example");
      }

      void Window::insertTextObject()
      {
          QString fileName = fileNameLineEdit->text();
          QFile file(fileName);
          if (!file.open(QIODevice::ReadOnly)) {
              QMessageBox::warning(this, tr("Error Opening File"),
                                   tr("Could not open '%1'").arg(fileName));
          }

          QByteArray svgData = file.readAll();

          QTextCharFormat svgCharFormat;
          svgCharFormat.setObjectType(SvgTextFormat);
          QSvgRenderer renderer(svgData);

          QImage svgBufferImage(renderer.defaultSize(), QImage::Format_ARGB32);
          QPainter painter(&svgBufferImage);
          renderer.render(&painter, svgBufferImage.rect());

          svgCharFormat.setProperty(SvgData, svgBufferImage);

          QTextCursor cursor = textEdit->textCursor();
          cursor.insertText(QString(QChar::ObjectReplacementCharacter), svgCharFormat);
          textEdit->setTextCursor(cursor);
      }

      void Window::setupTextObject()
      {
          QObject *svgInterface = new SvgTextObject;
          svgInterface->setParent(this);
          textEdit->document()->documentLayout()->registerHandler(SvgTextFormat, svgInterface);
      }

      void Window::setupGui()
      {
          fileNameLabel = new QLabel(tr("Svg File Name:"));
          fileNameLineEdit = new QLineEdit;
          insertTextObjectButton = new QPushButton(tr("Insert Image"));

          fileNameLineEdit->setText(":/files/heart.svg");
          connect(insertTextObjectButton, SIGNAL(clicked()),
                  this, SLOT(insertTextObject()));

          QHBoxLayout *bottomLayout = new QHBoxLayout;
          bottomLayout->addWidget(fileNameLabel);
          bottomLayout->addWidget(fileNameLineEdit);
          bottomLayout->addWidget(insertTextObjectButton);

          textEdit = new QTextEdit;

          QVBoxLayout *mainLayout = new QVBoxLayout;
          mainLayout->addWidget(textEdit);
          mainLayout->addLayout(bottomLayout);

          setLayout(mainLayout);
      }