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Old 07-20-2023, 01:52 PM   #1
thiago.eec
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Tag browser flickering
I'm using calibre 6.23 on Windows 11, dark mode.

Calibre uses a dark background and light font (probably a light gray).
But, when you expand some items on the Tag Browser, most of the text of the items below this one flicks, becoming black and then going back to the light font.

This flickering does not happen when using light mode.
Last edited by thiago.eec; 07-20-2023 at 04:10 PM. Reason: typo
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Old 07-20-2023, 06:20 PM   #2
BetterRed
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Quote:
Originally Posted by thiago.eec View Post
I'm using calibre 6.23 on Windows 11, dark mode.

Calibre uses a dark background and light font (probably a light gray).
But, when you expand some items on the Tag Browser, most of the text of the items below this one flicks, becoming black and then going back to the light font.

This flickering does not happen when using light mode.
Did it happen in previous versions?

Which items?

Did you try changing the Look & feel->Main interface->User interface style from calibre-style to System-style (or vice versa)? That's the first setting on that dialogue.

BR
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Old 07-21-2023, 09:36 AM   #3
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Originally Posted by BetterRed View Post
Did it happen in previous versions?
Yes. Just tested here on 4.23 portable. I only noticed now because I removed all my tags and started from scratch, using hierarchical tags.

Quote:
Originally Posted by BetterRed View Post
Which items?
Most of them. See the video attached.

Quote:
Originally Posted by BetterRed View Post
Did you try changing the Look & feel->Main interface->User interface style from calibre-style to System-style (or vice versa)? That's the first setting on that dialogue.
It happens both in calibre style and system style.
Attached Files
File Type: avi Tag-Browser.avi (7.61 MB, 51 views)
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Old 07-21-2023, 10:06 AM   #4
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I can reproduce in dark mode, linux mint 21.2. My best guess would that it is something in qt with dark mode.

bernie

Quote:
Originally Posted by thiago.eec View Post
Yes. Just tested here on 4.23 portable. I only noticed now because I removed all my tags and started from scratch, using hierarchical tags.



Most of them. See the video attached.



It happens both in calibre style and system style.
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Old 07-21-2023, 11:55 AM   #5
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@kovid: this seems to be caused by the adjustment for dark theme when painting highlighted (hovered) tag browser labels done in gui2.library.views.paint_text at line 70. According to my experiments (on Windows) the painter must have a correct dark mode pen set if the item is not being highlighted. If the pen is not set then Qt seems to use a black pen, which is replaced later the correct color.

I pushed a PR with my fix. I freely admit that I might have broken something, but I don't see anything. It is also possible that the non-hover pen should be something other than Qt.GlobalColor.white. Finally, it is possible that this should be done in a style sheet somewhere instead of in code.
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Old 07-21-2023, 12:34 PM   #6
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Your fix is fine except that it should use window-text rather than white.
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Old 07-21-2023, 04:03 PM   #7
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Thanks @chaley and @kovid. All good now!
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