QWidget per-pixel translusency

Question

I'm looking at making a QWidget partially transluscent.

QWidget::setMask can set a per-pixel transparency, like this, but it's either-or: not transluscent.

QWidget::opacity can set a global transluscency, but it's not per-pixel.

How can I get the best of both worlds and add a per-pixel alpha channel to the whole widget? (Decorations don't matter.)

Possible duplicate: http://stackoverflow.com/questions/1333610/displaying-translucent-irregular-shaped-windows-with-qt and for the per-Pixel part you can paint a `QPixmap` with an alpha channel as the background. — alexisdm, Oct 13 '11 at 17:30
Have to agree with the above comment. Follow the setup in the link above and paint what you want in the paint event. — Trenton Schulz, Oct 13 '11 at 18:33

score 0 · Answer 1 · answered Oct 13 '11 at 16:14

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Maybe QWidget::setMaks()?

QLabel topLevelLabel;
QPixmap pixmap(":/images/tux.png");
topLevelLabel.setPixmap(pixmap);
topLevelLabel.setMask(pixmap.mask());

answered Oct 13 '11 at 16:14

k06a

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As mentioned in the original post, that's not transluscent (the mask it a bitmap) – spraff Oct 13 '11 at 16:24

score 0 · Answer 2 · answered Oct 13 '11 at 16:16

0

It looks like the QStyle class is what you might be looking for, esp. QStyle::drawItemPixmap; then use QWidget::setStyle(). Never used this myself though.

answered Oct 13 '11 at 16:16

Matt Phillips

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QWidget per-pixel translusency

2 Answers2