Styling QPushbutton with a Popup QDockWidget

[Phlucious]

I have set the icon for one of my QPushButtons using the Qt standard icons (as an aside, how do I do this in Designer?)

ui->pushButton->setIcon(qApp->style()->standardIcon(QStyle::SP_ArrowRight));

ui->pushButton->setIcon(qApp->style()->standardIcon(QStyle::SP_ArrowRight));

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My desired functionality is to have the button pop up a QDockWidget while clicked/checked, then have it close the QDockWidget when clicked again. The button should be in a depressed state while the dock widget is open and should appear normal when the widget is closed.

Does this functionality already exist somewhere in another widget, or do I need to recreate it somehow? If I need to recreate it, how do I access the greyed-out version of the standard icon? Basically, I'd like to set the button to appear disabled, but still function as if it's enabled. Is that possible?

[AlekseyOk]

1. to set button pressed you should:
- setCheckable(true);
2. to change icon in different states (normal, hover, pressed) you can inherit you class from QPushButton or you can use style sheets (see http://doc.qt.io/qt-4.8/http://doc-snapshot.qt-project.org/4.8/stylesheet.html).
3. the only one standard push button behavior - show menu (see QPushButton::setMenu).