Bug 481852

Summary:	qt QScreen::availiableSize will return fullscreen size
Product:	[Plasma] kwin	Reporter:	uniqueding <1224472370>
Component:	wayland-generic	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	kde, nate
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description uniqueding 2024-02-26 09:59:34 UTC

SUMMARY
***
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***
QScreen::availiableSize api on x11 environment will return rect without dock, but on wayland environment will return fullscreen size

STEPS TO REPRODUCE
use QScreen::availiableSize to get screen availiable size

OBSERVED RESULT
show fullscreen size with dock region

EXPECTED RESULT
show region except such as dock panel

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 5.27.10
(available in About System)
KDE Plasma Version: 5.27.10
KDE Frameworks Version: 
Qt Version: 5.12

ADDITIONAL INFORMATION

Comment 1 Vlad Zahorodnii 2024-02-27 12:43:53 UTC

Can you explain why you need that information?

Comment 2 Nate Graham 2024-02-27 18:32:45 UTC

Regardless, since this is Qt API, isn't this a Qt bug?

Comment 3 uniqueding 2024-02-28 02:19:03 UTC

(In reply to Vlad Zahorodnii from comment #1)
> Can you explain why you need that information?

I want my window to not extend onto the dock， so I want get availiableSize to limit my window geometry like x11

Comment 4 uniqueding 2024-02-28 02:23:26 UTC

(In reply to Nate Graham from comment #2)
> Regardless, since this is Qt API, isn't this a Qt bug?

Although this is a Qt API, there is no related protocol on Wayland to pass this geometry.

Comment 5 Vlad Zahorodnii 2024-02-28 08:36:56 UTC

(In reply to uniqueding from comment #3)
> (In reply to Vlad Zahorodnii from comment #1)
> > Can you explain why you need that information?
> 
> I want my window to not extend onto the dock， so I want get availiableSize
> to limit my window geometry like x11

It works slightly different on wayland. There's xdg_toplevel.configure_bounds https://wayland.app/protocols/xdg-shell#xdg_toplevel:event:configure_bounds

kwin and qt support it. although I believe they are available only in plasma 6.

Comment 6 Vlad Zahorodnii 2024-02-28 08:37:32 UTC

note that qt will take care of honoring xdg_toplevel.configure_bounds

Comment 7 David Edmundson 2024-02-28 12:26:28 UTC

To rephrase Vlad's comment, it means the window will be resized automatically, but you don't get this ahead of time in a useful way.

It's a broken design, but we're limited within the scope of Wayland. Anything else needs to be taken up on the wayland-protocols repository.