How to create a bold, red text label in Qt?

Question

I want to write a single, bold red line in my application using Qt.

As far as I understand, I would create a QLabel, set its textFormat to rich text and give it a rich text string to display:

QLabel *warning = new QLabel;
warning->setTextFormat(Qt::RichText);
warning->setText("{\\rtf1\\ansi\\ansicpg1252 {\\fonttbl\\f0\\fswiss\\fcharset0 Helvetica;} {\\colortbl;\\red255\\green0\\blue0;} \\f0 \\cf0 this is bold red text}");

I tested this rich text string in a rich text editor and it displays fine.

But Qt displays the whole string with all braces, keywords and backslashes instead of "this is bold red text". What am I doing wrong?

Thank you for your help.

score 70 · Accepted Answer · answered Sep 23 '09 at 08:03

70

Try using HTML formatting: <b><font... etc </b>.

Qt Designer does it like this: <span style=" font-size:8pt; font-weight:600; color:#aa0000;">TextLabel</span>

answered Sep 23 '09 at 08:03

rpg

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You may need to set the QLabel's textFormat attribute to Qt::RichText. – dwj Jan 29 '13 at 23:43
and shows as text and doesnt format when used on a QLabel – Dean P Aug 15 '19 at 17:47

score 47 · Answer 2 · answered Mar 22 '16 at 15:38

47

You can use Qt StyleSheets and set the styleSheet property of QLabel

warning->setStyleSheet("font-weight: bold; color: red");

Qt supports most CSS styles on its QWidget-derived classes. You don't need to set the text format to Qt::RichText for this to work.

answered Mar 22 '16 at 15:38

code-tinkerer

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Answering my own comment: it is becouse first part(title) was in `font` tag with `size` set to relative value and other body wasn't in it... – ephemerr Sep 03 '20 at 13:51

score 13 · Answer 3 · edited Sep 16 '14 at 17:14

13

Qt uses a simple HTML subset for formatting.

edited Sep 16 '14 at 17:14

Joshua D. Boyd

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answered Sep 23 '09 at 08:05

gnud

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score 1 · Answer 4 · edited May 26 '20 at 09:34

1

You can also do it programmatically using the settext function. Something like this:

QString labelText = "<P><b><i><font color='#ff0000' font_size=4>";
labelText .append("Text what u want to display");
labelText .append("</font></i></b></P></br>");
QLabel label->setText(labelText);

You can do it in a single line as well.

edited May 26 '20 at 09:34

Community

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answered Aug 31 '12 at 08:27

Ramya B

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How to create a bold, red text label in Qt?

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