Customize QMenu display with QProxyStyle

[Charles]

QProxyStyle automatically proxies to the used application style.

If you want rounded corners you need to port the whole C code in the
OS style plugin that draws the menu item.

Alternatively, use the fusion style which should be OS independent.
With fusion style, overriding drawItemText should work.

On Mon, Jun 9, 2025 at 11:30 PM John Sturtz <john at sturtz.org> wrote:

> Thanks again Charles.  In searching around, I found some examples that
> reimplemented drawItemText() and some that reimplemented drawControl().
> The former seemed more intuitive to me (goes to show you what I know), so I
> went down the wrong rabbit hole.
>
> One more question if you will:  I've attached a newer version of my
> original sample, based on your suggestion.
>
> If I install the proxy style for the menu with:
>
>     file_menu.setStyle(Style())
>
> it works (items are right-justified).  But the menu has a slightly
> different appearance (on my system, rounded corners).  Not surprising, I
> suppose.  No arguments are passed to the Style() constructor, so it's
> creating one from scratch.
>
> I'd think the proper thing to do would be to derive the new style from the
> menu's previously-existing style:
>
>     file_menu.setStyle(Style(file_menu.style()))
>
> Wondering if this is a/the proper thing to do?  It seems to work, in that
> the menu then has the proper appearance (that is, one that is consistent
> with its appearance if I don't assign the proxy).
>
> But then when I exit the app, there's a long(ish -- about two seconds)
> delay.  If I run the app from a Command Prompt window, it's a couple
> seconds before the command prompt reappears -- I think the app is not
> merely exiting, but actually crashing.  Which makes me wonder if this is
> somehow not right?
>
> Thanks again!
>
> /John
>
>
> ------ Original Message ------
> From "Charles" <peacech at gmail.com>
> To "John Sturtz" <john at sturtz.org>
> Cc pyqt at riverbankcomputing.com
> Date 6/9/2025 12:32:17 AM
> Subject Re: Customize QMenu display with QProxyStyle
>
> >  Wrong QProxyStyle method. Tip: to know the right method, search for
> menuitem in
> https://codebrowser.dev/qt6/qtbase/src/widgets/styles/qcommonstyle.cpp.html
>
> Sorry, this is wrong. QMenu is drawn by the OS style plugin and does not
> call drawItemText. For example see:
> https://codebrowser.dev/qt6/qtbase/src/widgets/styles/qwindowsstyle.cpp.html#1012
>
> On Mon, Jun 9, 2025 at 12:22 PM Charles <peacech at gmail.com> wrote:
>
>> Wrong QProxyStyle method. Tip: to know the right method, search for
>> menuitem in
>> https://codebrowser.dev/qt6/qtbase/src/widgets/styles/qcommonstyle.cpp.html
>>
>> class Style(QProxyStyle):
>>     def drawControl(self, element, option, painter, widget):
>>         if element == QStyle.ControlElement.CE_MenuItem:
>>             super().drawItemText(painter, option.rect,
>> Qt.AlignmentFlag.AlignRight, option.palette, True, option.text,
>> QPalette.ColorRole.ButtonText)
>>         else:
>>             return super().drawControl(element, option, painter, widget)
>>
>> On Mon, Jun 9, 2025 at 11:14 AM John Sturtz <john at sturtz.org> wrote:
>>
>>> Hello again PyQt sages.  Hoping for some insight here -- despite a few
>>> hours' time fiddling with this, I don't seem to even be getting past square
>>> one.
>>>
>>> I'm trying to modify display of items in a QMenu using QProxyStyle.
>>> Basically, I've defined a class named Style that derives from
>>> QProxyStyle, and re-implements drawItemText() (which, just for
>>> starters, tries to right-justify the menu item text).
>>>
>>> I create a QMenu object, create an object of the Style class, and call
>>> .setStyle() to set it as the menu's style.
>>>
>>> It may or may not be the case that my drawItemText() implementation
>>> successfully right-justifies the text.  I'll never know, because it never
>>> gets called.  What (probably really basic thing) am I missing?
>>>
>>> Thanks!  [short sample code attached]
>>>
>>> /John
>>>
>>
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