Qt dynamic styles [Stylesheet]?
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I was needing a QLabel that could deal with a mouse hover event - since :hover is not supported by QLabel, I had to override a new class from QLabel, responding to enterEvent() and leaveEvent(). So far so good.
What I really needed was to put an underline decoration on the QLabel text:
@QFont f(font());
f.setUnderline(true [or false]);
this->setFont(f);@However, wanting to venture deeper into decoration (changing text color, for example), I was met by a road block. The easiest way to change text color is via stylesheets, but in this case I had other styles applied to the element that I did not want to change, so simply setting a new stylesheet would clear the one already set. I could of course append/delete the parts I wished to change, but it seems to me that's sort of overcomplicating matters.
To the point: Is it in any way possible to change individual stylesheet styles dynamically for a widget? Like,
@QWidget::setStyle("color", "#CCCCCC");@
(I know that setStyle is already available, setting a QStyle, but that's beside the point).
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The :hover property does work for labels, but it seems sorta selective for text decoration, ie. this works as expected:
@
setStyleSheet("QLabel { color: red; }
QLabel:hover { color: blue; } ");
@
this works too
@
setStyleSheet(" QLabel { text-decoration: underline; } ");
@
but this doesn't:
@
setStyleSheet(" QLabel:hover { text-decoration: underline; } ");
@
It actually looks like a bug to me.Anyway, there's no way to selectively change one part of a stylesheet, but you can use a palette trick: set your color in the stylesheet to something like "color: palette(dark)" or any other element you don't plan to use and then change the appropriate palette color for this widget.
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The "hover" stylesheet event is not defined for QLabel (even though it works in some cases, go figure); this is a documented anti-feature. Beats me though, because in my world it's probably one of the most obvious places to use it.
Thanks, but I was sort of hoping to avoid playing with QPalette, although if there's no way around I might just have to.
