Qt QTextEdit添加虚假行

Dav*_*rra 6 c++ qt qtextedit

看看这一小块Qt代码

qDebug() << "CONTENT" << content;

QTextEdit *te = new QTextEdit(this);
te->setHtml(content);

qDebug() << "CONTENT AFTER " << te->toHtml();
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内容最初包含此HTML

<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0//EN\" \"http://www.w3.org/TR/REC-html40/strict.dtd\">
<html>
    <head>
        <meta name=\"qrichtext\" content=\"1\" />
        <style type=\"text/css\"> p, li { white-space: pre-wrap; } </style>
    </head>
    <body style=\" font-family:'Calibri'; font-size:10pt; font-weight:400; font-style:normal;\">
        <p style=\" margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;\">
            <span style=\" font-family:'Verdana'; color:#0b333c;\">MY TEXT</span>
        </p>
    </body>
</html>"
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......但输出te->toHtml()是......

<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0//EN\" \"http://www.w3.org/TR/REC-html40/strict.dtd\">
<html>
    <head>
        <meta name=\"qrichtext\" content=\"1\" />
        <style type=\"text/css\">\np, li { white-space: pre-wrap; }\n</style>
    </head>
    <body style=\" font-family:'Calibri'; font-size:10pt; font-weight:400; font-style:normal;\">
        <p style=\" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;\"> </p>
        <p style=\" margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;\">
            <span style=\" font-family:'Verdana'; color:#0b333c;\">MY TEXT</span>
        </p>
    </body>
</html>
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正如你所看到的那样,QTextEdit没有任何理由的前言段落.这非常烦人,我绝对需要避免它.

有任何想法吗?我真的无法弄清楚如何摆脱这种行为.它可能是一个错误吗?

cbu*_*art 0

可能有点晚了,但我已经多次遇到类似的问题。我发现 Qt 使用的 HTML 解析器不喜欢HTML 缩进,并将此类空格解释为要格式化的文本,而不是忽略它。

要解决这个问题,只需在设置 HTML 之前删除缩进即可。

这是一个完整的测试(代码也可以在这里找到)

#include <qapplication.h>
#include <qtextedit.h>
#include <qdebug.h>
#include <qregexp.h>

int main(int argc, char* argv[])
{
  QApplication a(argc, argv);

  const QString content =
    "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0//EN\" \"http://www.w3.org/TR/REC-html40/strict.dtd\">"
    "<html>"
    "    <head>"
    "        <meta name=\"qrichtext\" content=\"1\" />"
    "        <style type=\"text/css\"> p, li { white-space: pre-wrap; } </style>"
    "    </head>"
    "    <body style=\" font-family:'Calibri'; font-size:10pt; font-weight:400; font-style:normal;\">"
    "        <p style=\" margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;\">"
    "            <span style=\" font-family:'Verdana'; color:#0b333c;\">MY TEXT</span>"
    "        </p>"
    "    </body>"
    "</html>";

  qDebug() << "Original content";
  qDebug() << content;

  QTextEdit text_edit_1;
  text_edit_1.setHtml(content);
  qDebug() << "";
  qDebug() << "HTML from QTextEdit:";
  qDebug() << text_edit_1.toHtml();

  // Removing spaces (not necessarily the best way, but it works for this example)
  const QString content2 = QString(content).replace(QRegExp("\\s+<"), "<");
  qDebug() << "";
  qDebug() << "Content without spaces:";
  qDebug() << content2;

  QTextEdit text_edit_2;
  text_edit_2.setHtml(content2);
  qDebug() << "";
  qDebug() << "HTML from QTextEdit:";
  qDebug() << text_edit_2.toHtml();

  QTextEdit text_edit_3;
  text_edit_3.setHtml(text_edit_2.toHtml());
  qDebug() << "";
  qDebug() << "After re-using HTML:";
  qDebug() << text_edit_3.toHtml();

  return 0;
}
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我使用 Qt 5.1.0 对其进行了测试,结果如下(我仅对输出 HTML 进行了漂亮的格式化以方便检查):

结果与原始内容

<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0//EN\" \"http://www.w3.org/TR/REC-html40/strict.dtd\">\n<html>
  <head>
    <meta name=\"qrichtext\" content=\"1\" />
    <style type=\"text/css\">\np, li { white-space: pre-wrap; }\n</style>
  </head>
  <body style=\" font-family:'MS Shell Dlg 2'; font-size:8.25pt; font-weight:400; font-style:normal;\">\n<p style=\" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;\">        </p>\n<p style=\" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;\">
      <span style=\" font-family:'Calibri'; font-size:10pt;\">        </span>
    </p>\n<p style=\" margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;\">
      <span style=\" font-family:'Calibri'; font-size:10pt;\">            </span>
      <span style=\" font-family:'Verdana'; font-size:10pt; color:#0b333c;\">MY TEXT</span>
      <span style=\" font-family:'Calibri'; font-size:10pt;\">            </span>
    </p>
  </body>
</html>
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从内容中删除缩进和标签之间的空格后的结果

<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0//EN\" \"http://www.w3.org/TR/REC-html40/strict.dtd\">\n<html>
  <head>
    <meta name=\"qrichtext\" content=\"1\" />
    <style type=\"text/css\">\np, li { white-space: pre-wrap; }\n</style>
  </head>
  <body style=\" font-family:'MS Shell Dlg 2'; font-size:8.25pt; font-weight:400; font-style:normal;\">\n<p style=\" margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;\">
      <span style=\" font-family:'Verdana'; font-size:10pt; color:#0b333c;\">MY TEXT</span>
    </p>
  </body>
</html>
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使用 HTML 生成的结果QTextEdit::toHtml()

<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0//EN\" \"http://www.w3.org/TR/REC-html40/strict.dtd\">\n<html>
  <head>
    <meta name=\"qrichtext\" content=\"1\" />
    <style type=\"text/css\">\np, li { white-space: pre-wrap; }\n</style>
  </head>
  <body style=\" font-family:'MS Shell Dlg 2'; font-size:8.25pt; font-weight:400; font-style:normal;\">\n<p style=\" margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;\">
      <span style=\" font-family:'Verdana'; font-size:10pt; color:#0b333c;\">MY TEXT</span>
    </p>
  </body>
</html>
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也可以看出,生成的 HTMLQTextEdit可以重新插入到文档中,而无需添加虚假行。

请注意,所有这些也适用于QTextDocument,它基本上是 所使用的底层结构QTextEdit