QPlainTextEdit使用HTML方式设置颜色

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最新推荐文章于 2025-05-16 19:08:09 发布

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本文介绍如何使用QPlainTextEdit组件通过HTML格式来设置文本颜色。代码示例展示了如何随机生成不同颜色的文本，并在Qt应用程序中定时更新文本内容。

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QPlainTextEdit可使用HTML方式设置文本颜色，代码如下：

#include <QtWidgets>

const QString& makeText()
{
  static const QString texts[] = {
    QString::fromLatin1("Lorem ipsum dolor sit amet, consectetur adipisici elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua."),
    QString::fromLatin1("Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat."),
    QString::fromLatin1("Quis aute iure reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur."),
    QString::fromLatin1("Excepteur sint obcaecat cupiditat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."),
    QString::fromLatin1("Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi."),
    QString::fromLatin1("Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat."),
    QString::fromLatin1("Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat."),
    QString::fromLatin1("Nam liber tempor cum soluta nobis eleifend option congue nihil imperdiet doming id quod mazim placerat facer possim assum."),
    QString::fromUtf8("HTML Meta-Characters: < > & \" ' and\nnon-ASCII characters: \xc3\xa4 \xc3\xb6 \xc3\xbc \xc3\x9f \xc3\x84 \xc3\x96 \xc3\x9c")
  };
  enum { NTexts = sizeof texts / sizeof *texts };
  return texts[qrand() % NTexts];
}

const QString formatHtml(const QString &qText, const QColor &qColor)
{
  QString qHtmlText
    = QString::fromLatin1("<p style='color: ")
    % qColor.name(QColor::HexRgb)
    % QString::fromLatin1("'>");
  for (const QChar qChar : qText) {
    switch (qChar.unicode()) {
      case '<': qHtmlText += QString::fromLatin1("&lt;"); break;
      case '>': qHtmlText += QString::fromLatin1("&gt;"); break;
      case '&': qHtmlText += QString::fromLatin1("&amp;"); break;
      case '"': qHtmlText += QString::fromLatin1("&quot;"); break;
      case '\'': qHtmlText += QString::fromLatin1("&apos;"); break;
      case '\n': qHtmlText += QString::fromLatin1("<br/>"); break;//不确定是否有效
      default: qHtmlText += qChar; // everything else unchanged
    }
  }
  qHtmlText += QString::fromLatin1("</p>");
  return qHtmlText;
}

int main(int argc, char **argv)
{
  qDebug() << "Qt Version:" << QT_VERSION_STR;
  QApplication app(argc, argv);
  // setup GUI
  QPlainTextEdit qTxtEdit;
  qTxtEdit.show();
  // install signal handlers
  QTimer qTimer;
  qTimer.setInterval(1000); // 1000 ms = 1 s
  QObject::connect(&qTimer, &QTimer::timeout,
    [&]() {
      const QColor qColor(qrand() % 4 == 1 ? 0xFF0000 : 0x000000);
      qTxtEdit.appendHtml(formatHtml(makeText(), qColor));
    });
  qTimer.start();
  // runtime loop
  return app.exec();
}