Dynamically change QStyle at runtime?

Question

I want to tweak the existing style at runtime, specifically QStyle::PM_ToolBarIconSize. Can this be done? As far as I can tell, you can only inherit QStyle and override pixelMetric().

Edit 1: In the specific case of QStyle::PM_ToolBarIconSize, I could use QToolBar::setIconSize, but that would set the icon size for just a single toolbar instance. I want to change the underlying style hint to affect all toolbars everywhere with one fell swoop. And QStyle::PM_ToolBarIconSize may not be the only style I want to tweak, it's just the first one I'm looking at that just so happens to have a "change this instance's icon size" function.

Edit 2: I can't just make a new style subclass because the current style is already a custom style based on style sheets. There are several styles that a user can choose from. I don't want to create a bunch of new styles just so I can tweak a couple of toolbar icon or menu height size settings.

How about [QToolBar::setIconSize](http://doc.qt.io/qt-5/qtoolbar.html#iconSize-prop) — Robert, Jul 06 '15 at 21:59
Yeah, but that's not quite what I was looking for. I have, hopefully, clarified my question. — brock, Jul 07 '15 at 03:20

score 1 · Accepted Answer · answered Jul 08 '15 at 20:45

1

This is the exact purpose of QProxyStyle.

answered Jul 08 '15 at 20:45

brock

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score 0 · Answer 2 · answered Jul 07 '15 at 06:17

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Why not overriding QStyle then? Your subclass would return an icon size (via pixelMetric) which depends on a settable parameter of your QStyle.

As Qt does not have a dynamic QStyle mechanism, it is better to create a new style instance with the changed icon size, then set it to the QApplication, rather than altering the current style.

answered Jul 07 '15 at 06:17

galinette

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This is not a viable option for me. I have further clarified my question as to why this is so. – brock Jul 07 '15 at 14:06

Dynamically change QStyle at runtime?

2 Answers2