If you use a stylesheets it takes priority over a palette
I think you’re right about that; this should otherwise have produced a
yellow background, but it ends up blue.
window = QtWidgets.QWidget()
window.setFixedSize(800, 600)
window.show()
yellow = QtGui.QColor("yellow")
brush = QtGui.QBrush(yellow)
palette = app.palette()
palette.setBrush(QtGui.QPalette.Window, brush)
app.setStyleSheet("QWidget { background-color: 'blue' }")
app.setPalette(palette)
It looks like the reason is that stylesheets are parsed into an
undocumented QStyleSheetStyle which then becomes a *parent* of the
application style itself; via a call to setParent on the QStyle of the
application.
I couldn’t find a search function in gitorious, but it’s on line 1087 of
qapplication.cpp.
because I had never had the expectation that multiple calls to
setStyleSheet would be incremental changes to the previous stylesheet.
No, you’re right, it doesn’t work the way I meant. The last call wipes out
the call before it.
window = QtWidgets.QWidget()
window.setFixedSize(800, 600)
window.show()
app.setStyleSheet("QWidget { background-color: 'blue' }")
app.setStyleSheet("QWidget { border: 5px solid red }")
I was thinking of applying stylesheets incrementally to individual widgets.
This will on the other hand apply the border to the window, whilst keeping
it blue via cascading.
window = QtWidgets.QWidget()
window.setFixedSize(800, 600)
window.show()
app.setStyleSheet("QWidget { background-color: 'blue' }")
window.setStyleSheet("QWidget { border: 5px solid red }")
In any case, grabbing the stylesheet from QApplication in this latter case
will not yield the stylesheet applied to the QWidget window.
On 10 March 2015 at 21:33, Justin Israel <[email protected]> wrote:
>
>
> On Wed, Mar 11, 2015 at 10:07 AM Marcus Ottosson <[email protected]>
> wrote:
>
>> But the part about the stylsheets being converted and not stored was
>> definitely not right.
>>
>> What you’re seeing there is merely the last command put into
>> setStyleSheet, it doesn’t actually represent the sum of each individual
>> command. Technically, the string is cached internally, into a private
>> member of QApplication and discarded each time it is set.
>>
>> You can prove that by setting it twice.
>>
>> app.setStyleSheet("QWidget { background-color: 'blue' }")
>> app.setStyleSheet("QWidget { font: 'verdana' }")assert app.styleSheet() ==
>> "QWidget { font: 'verdana' }"
>>
>> What’s more, it also doesn’t take into account stylesheets applied to
>> children within widgets or the application.
>>
> Maybe this is just about expectations... because I had never had the
> expectation that multiple calls to setStyleSheet would be incremental
> changes to the previous stylesheet. I have always assume you are setting
> the whole stylesheet. In which case, it is storing the stylesheet for that
> object and using it as part of the cascading effect. "set" to me generally
> means to replace the previous value with a new value.
>
>
>> You can prove that by applying it to a widget first, and then
>> application. As the widget is affected by the stylesheet, one might think
>> it should be able to reproduce it.
>>
>> widget = QtWidgets.QWidget()
>> app.setStyleSheet("QWidget { font: 'verdana' }")assert widget.styleSheet()
>> == ""
>>
>> Which means that unless you’re certain that the setStyleSheet command
>> was used only once, on only one object - either the QApplication, or a
>> QWidget, which are the only objects that carry this method - then it’s
>> quite difficult to be certain that what you get is what’s actually being
>> drawn.
>>
>
> Again, expectations I suppose. It is a cascading system, so if a specific
> object never had a stylesheet value applied, then it only inherits from the
> parent and has no additional modifications.
>
>
>> If you use a stylesheets it takes priority over a palette
>>
>> I think it’s more a matter of which gets set last.
>>
>
> Well, the documentation does suggest that stylesheets should not be mixed
> with custom palettes:
> http://qt-project.org/doc/qt-4.8/qwidget.html#palette-prop
>
> So I presume that to mean non-deterministic behaviour. You either try to
> fully go the stylesheet route, or custom palettes, is what I take away from
> that. And based on my past experience of having some reference issues to
> palette values in combination with stylesheets (as Tony had also
> confirmed), I tend to believe the non-deterministic behaviour is real.
>
>
>> They are also supposedly a touch slower
>>
>> Then what? In the above example, four QPalette roles are being set with
>> only one CSS directive. Some may argue that this would be faster than
>> setting each role manually; at least when it’s done from Python.
>>
>> Maya is most likely using a custom QStyle/palette and not stylesheets.
>>
>> They not necessarily mutually exclusive. Some things may be more easily
>> set using stylesheets, whereas others are easier/only possible via QPalette.
>>
>> It’s all in the source, folks.
>> https://qt.gitorious.org/qt
>>
> See above
>
>
>>
>>
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--
*Marcus Ottosson*
[email protected]
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