Qt 5.9 | Qt SVG | Text Object Example | window.cpp Example File

Qt 5.9.2 Reference Documentation

# window.cpp Example File

richtext/textobject/window.cpp

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      #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);
      }