How to change the font and color of QString?

[learnist]

i have a QString like this ">>> This is an Arrow." , now i want to have >>> in bold and red, How to do that ?

i have looked over some pages and found this syntax

QString redPart = QString("<span style=" color:#ff0000;">%1</span>").arg(">>>");

but it gives some error like ")" missing and, i am not able to figure it out.

[JonB]

@learnist
Look at your " (double-quote) characters in the literal string after style= in your string and sort them out (C++ literal strings).

A QString in itself doesn't have colors. Which Qt widget are you intending to display this colored string in?

[SGaist]

Hi,

What is the exact error you get ?
Where exactly do you want that color to appear ?

[learnist]

@JonB It is going to be the text of a List item in a QList Widget.

[SGaist]

In that case, you should check the various item data roles of Qt's item view system especially ForegroundRole.

[learnist]

@SGaist Hi, i want the color to appear red of ">>>" and i get error on color and #

[JonB]

@learnist
I have already told you why you get an error in your code. Why bother if you're going to ignore it? You should read up how to put " character into C++ string literals, you need to know how to do that to code successfully.

Once you have done that proceed the way you were intending. That will allow you to mix colors in a QListWidgetItem.

[SGaist]

For the special rendering you want, you will have to implement a QStyledItemDelegate.

[JonB]

@SGaist
I do not see why he needs to do as you say?! :) Since QListWidgetItem does accept HTML, what's wrong with just using that? I don't see the need for ForegroundRole or for a delegate? Remmeber he wants certain characters with different color/weight, easy to do in HTML.

[SGaist]

@JonB said in How to change the font and color of QString?:

@SGaist
I do not see why he needs to do as you say?! :) Since QListWidgetItem does accept HTML, what's wrong with just using that? I don't see the need for ForegroundRole or for a delegate?

ForegroundRole to change the color of the text but I forgot it was only for a small portion of it.

I don't didn't remember QListWidgetItem supporting html out of the box, that's why I suggested the delegate.

[JonB]

@SGaist said in How to change the font and color of QString?:

I don't remember QListWidgetItem supporting html out of the box, that's why I suggested the delegate.

I trusted https://stackoverflow.com/questions/22247904/how-to-style-rich-text-in-qlistwidgetitem-and-qcombobox-items-pyqt-pyside

You could use html/css-likes styles, i.e just wrap your text inside tags:
item.setData( QtCore.Qt.UserRole, "<b>{0}</b>".format('data to store for this QListWidgetItem'))

and others. Assuming it does, it will be a lot simpler for the OP than writing a delgate.

Whoops, OK, I see that was UserRole... One person said it did work, one said it did not? OK, maybe QListWidgetItem does not support rich text :(

[SGaist]

@JonB tests are in order ! It would indeed be simpler.

As I miswrote (and fixed) it's possibly a memory issu :-).