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textedit.cpp Example File
help/simpletextviewer/textedit.cpp

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 #include <QtCore/QFileInfo>
 #include <QtCore/QFile>

 #include "textedit.h"

 TextEdit::TextEdit(QWidget *parent)
     : QTextEdit(parent)
 {
     setReadOnly(true);
 }

 void TextEdit::setContents(const QString &fileName)
 {
     QFileInfo fi(fileName);
     srcUrl = QUrl::fromLocalFile(fi.absoluteFilePath());
     QFile file(fileName);
     if (file.open(QIODevice::ReadOnly)) {
         QString data(file.readAll());
         if (fileName.endsWith(".html"))
             setHtml(data);
         else
             setPlainText(data);
     }
 }

 QVariant TextEdit::loadResource(int type, const QUrl &name)
 {
     if (type == QTextDocument::ImageResource) {
         QFile file(srcUrl.resolved(name).toLocalFile());
         if (file.open(QIODevice::ReadOnly))
             return file.readAll();
     }
     return QTextEdit::loadResource(type, name);
 }