How to center QPixmap while Painting it inside QItemDelegate of QListWidget

Question

I'm painting a QPixmap inside the QItemDelegate of QListWidget. Each QListWidgetItem is of different dimensions. Inside the

void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index)

function of QItemDelegate, I want to paint QPixmap with center Alignment inside the QListWidgetItem. option.rect() gives the geometry of the item with which I can calculate the center position and paint accordingly, but I want to know the better approach for this alignment.Can some one let me know the answer?

Given all of those strategically placed Qs, I'm going to assume that this question is about Qt? — Cody Gray - on strike, Mar 08 '12 at 08:15
@CodyGray Yup. This is about Qt. You can see the tag also for that — Gokulakrishnan Gopalakrishnan, Mar 08 '12 at 15:07
@shobi I'm painting a QPixmap over a QListWidgetItem. I want to paint it in center aligned way. I want to know whether there is any in built paint method to paint centered aligned inside QListWidgetItem. If possible can you please answer my question posted in http://stackoverflow.com/questions/9618912/filtering-mouse-click-event-in-qlistwidget — Gokulakrishnan Gopalakrishnan, Mar 08 '12 at 15:10
@CodyGray I've one more question in this link(http://stackoverflow.com/questions/9618912/filtering-mouse-click-event-in-qlistwidget). If possible please answer it — Gokulakrishnan Gopalakrishnan, Mar 08 '12 at 15:12

score 2 · Answer 1 · answered Mar 08 '12 at 11:04

2

Do you know the dimensions of your QListWidgetItem? If so, just paint the QPixmap yourself with something like:

painter->drawPixmap(
    (item->width() - pixmap->width()) / 2,
    (item->heigt() - pixmap->height()),
    pixmap
);

answered Mar 08 '12 at 11:04

laurent

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yes, we can calculate the dimenstions od QListWidgetItem by option.rect. The code mentioned by you is what exactly I have mentioned as calculating ourself. I wanted to know is there any better approach for this other than calculating ourself – Gokulakrishnan Gopalakrishnan Mar 08 '12 at 13:45
@gokulakrishnangopalakrishnan, better approach? IMO, the best way is to do it yourself so you can control exactly how it's going to look. I wouldn't delegate to the framework for this kind of simple rendering (even for complex ones, I still think that the best way is to do it "manually". It brings a lot less headaches going around framework glitches and limitations). – laurent Mar 08 '12 at 14:43
@Laurant thanks. I've one more question (http://stackoverflow.com/questions/9618912/filtering-mouse-click-event-in-qlistwidget). If possible, can you please answer that? – Gokulakrishnan Gopalakrishnan Mar 08 '12 at 15:06

How to center QPixmap while Painting it inside QItemDelegate of QListWidget

1 Answers1

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