QTextEdit loses rich text formatting after pressing enter

tapsbrighton · 8 Sept 2022, 21:53

Can someone please help me. I have setup a simple QTextEdit and it accepts rich text. And whenever I press enter after the text that has a certain formatting, the cursor goes to the next line as expected. But when I press enter again, the cursor doesn't move. And when I press enter again, the cursor moves down but when it does so, it loses the text formatting that was applied. You can see it decrease in size and when I type new text it doesn't have any formatting.
How can I stop this behaviour? I was it to retain the previous formatting no matter how many empty lines I put by pressing enter.

The code for the setup of the QTextEdit is like this:

#include <QTextEdit>

Editor2::Editor2(QWidget *parent) : QTextEdit(parent) {

    setAcceptRichText(true);
    showMaximized();

    setHtml("<!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\">\n"
            "p, li { white-space: pre-wrap; }\n"
            "</style></head><body style=\" font-family:'Comic Relief'; font-size:15px; font-weight:600; 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; -qt-user-state:0;\"><span style=\" font-family:'Sanlulus'; font-size:22pt; font-weight:400; color:#00ffff; background-color:#aa0000;\">Will you shine and light the brightest</span></p>\n"
            "<p style=\" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;\"><span style=\" font-family:'Sanlulus'; font-size:22pt; font-weight:400; color:#00ffff; background-color:#aa0000;\">Will you shine and light the brightest</span></p>\n"
            "<p style=\" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;\"><span style=\" font-family:'Sanlulus'; font-size:22pt; font-weight:400; color:#00ffff; background-color:#aa0000;\">Will you shine and light the brightest</span></p>\n"
            "<p style=\" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;\"><span style=\" font-family:'Sanlulus'; font-size:22pt; font-weight:400; color:#00ffff; background-color:#aa0000;\">Will you shine and light the brightest</span></p>\n"
            "<p style=\" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;\"><span style=\" font-family:'Sanlulus'; font-size:22pt; font-weight:400; color:#00ffff; background-color:#aa0000;\">Will you shine and light the brightest</span></p></body></html>");
}

tapsbrighton · 9 Sept 2022, 06:54

@JonB I reimplemented the keyPressEvent and it seems to be working.

void Editor2::keyPressEvent(QKeyEvent *e)
{
    if(e->key()==Qt::Key_Return){
        qInfo()<<"Enter key pressed";

        append("");

    }else{
        QTextEdit::keyPressEvent(e);
    }
}

JonB · 9 Sept 2022, 06:36

@tapsbrighton
Not sure what your <Enters>/newlines are doing. You show the HTML you initially put into the QTextEdit. It would be interesting to see what that HTML ends up as when you do as you say and it goes wrong.

tapsbrighton · 9 Sept 2022, 06:40

@JonB The first line 'After pressing enter once' has the formatting as the text above it. However the last one, 'After pressing enter twice' has lost all formatting

<!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" /><meta charset="utf-8" /><style type="text/css">
p, li { white-space: pre-wrap; }
hr { height: 1px; border-width: 0; }
</style></head><body style=" font-family:'Segoe UI'; font-size:9pt; 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; -qt-user-state:0;"><span style=" font-family:'Sanlulus'; font-size:22pt; color:#00ffff; background-color:#aa0000;">Will you shine and light the brightest</span></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'Sanlulus'; font-size:22pt; color:#00ffff; background-color:#aa0000;">Will you shine and light the brightest</span></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'Sanlulus'; font-size:22pt; color:#00ffff; background-color:#aa0000;">Will you shine and light the brightest</span></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'Sanlulus'; font-size:22pt; color:#00ffff; background-color:#aa0000;">Will you shine and light the brightest</span></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'Sanlulus'; font-size:22pt; color:#00ffff; background-color:#aa0000;">Will you shine and light the brightest</span></p>
<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:'Sanlulus'; font-size:22pt; color:#00ffff; background-color:#aa0000;">After pressing enter once</span></p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Sanlulus'; font-size:22pt; color:#00ffff;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">After pressing enter twice</p></body></html>

JonB · 9 Sept 2022, 06:53

@tapsbrighton
Well, at least that explains why it shows as it does, right? But not why that happened, or whether you can do anything about it.

tapsbrighton · 9 Sept 2022, 06:54

@JonB I reimplemented the keyPressEvent and it seems to be working.

void Editor2::keyPressEvent(QKeyEvent *e)
{
    if(e->key()==Qt::Key_Return){
        qInfo()<<"Enter key pressed";

        append("");

    }else{
        QTextEdit::keyPressEvent(e);
    }
}

JonB · 9 Sept 2022, 07:11

@tapsbrighton
Well that simply discards the Return (why bother with append("")?). Which is OK if you are OK with that!

tapsbrighton · 9 Sept 2022, 07:27

@JonB It adds the new line that was supposed to be added and keeps the current text formatting

tapsbrighton · wrote on 9 Sept 2022, 07:27

@tapsbrighton This is a better solution rather than append:

insertPlainText("\n");