QTextBrowser::setHtml() doesn't change the html
-
wrote on 2 Jul 2014, 13:02 last edited by
I'm writing a program where MainWindow::keyPressEvent() compares the typed character with the expected input, and changes the contents of a textbrowser accordingly. The idea is to append the correct letter in red if the wrong character was typed, and in black if the correct character was typed.
I have hit a frustrating snag, namely that TextBrowser::setHtml() does not set the html.
This code, in void MainWindow::keyPressEvent(QKeyEvent *e):
@
qDebug()<<html<<"\n\n";
ui->textBrowser->setHtml(html);
qDebug()<<ui->textBrowser->toHtml()<<"\n";
@Gives this output:
@
"<!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 >
<p ><font color="red">H</font></p></body></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 >
<p ><br /></p></body></html>"
@As you can see, the textbrowser's html content is different from what was set as the textBrowser's content in the previous line. I have no idea why this happens.
-
Hi and welcome to devnet,
AFAIK, toHtml does a conversion from the content of the QTextBrowser's QTextEdit's QTextDocument so it does not return exactly the same document you set.
-
wrote on 2 Jul 2014, 16:48 last edited by
I see. The original problem that led me to notice this issue was that nothing was added to the text browser before a correct letter was typed.
I've found that the parser is rejecting adding "<font color="red">H</font>", with this code,
@
int pidx=html.lastIndexOf("</p>");
html.insert(pidx,toAdd);
@Unless a regular letter without the font tags has been inserted before.
The output looks like
@
"<!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 >
<p ><br /><font color="red">H</font></p></body></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 >
<p ><br /></p></body></html>"
@The oddest thing is that
@
QString html=ui->textBrowser->toHtml();
if(html.contains("<br />")){
html="<p>"+toAdd+"</p>";
}else{
int pidx=html.lastIndexOf("</p>");
html.insert(pidx,toAdd);
}
@works perfectly. I think this is a bug.
-
The parser is not perfect but can be enhanced. You should have a look a the "bug report system":http://bugreports.qt-project.org to see if this already known, if not then you can consider opening a new report providing a minimal compilable example that shows the behavior.
1/4