Bug 479810

Summary:	Use scroll-wheel and trackpad for Zoom/Magnifier effect
Product:	[Plasma] kwin	Reporter:	Christopher Smith <cj61947>
Component:	effects-various	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	wishlist	CC:	me, nate
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Christopher Smith 2024-01-14 16:43:14 UTC

SUMMARY
The Zoom and Magnifier effects currently use keyboard shortcuts to zoom in/out. There should also be an option to use the trackpad or scroll-wheel while holding the Meta key (similar to macOS, e.g. https://www.youtube.com/shorts/3TXOHl8knsE). Trackpad can either use a 2D pinch or two-finger scroll.

STEPS TO REPRODUCE
1. Open Desktop Effects settings
2. Open settings for Zoom/Magnifier
3. Enable scroll control through checkbox/radio button

Comment 1 ratijas 2024-01-17 15:21:27 UTC

Just to add a note, this feature might conflict with an existing feature: custom Window Actions in Window Behavior KCM.

For example, currently I'm using Meta as a modifier key with a Mouse Wheel action to change window opacity.

So, future developers are advised to keep the implementation cooperative with existing gestures, and warn users about duplicated gestures, just like we currently warn about duplicated shortcuts.

Comment 2 Nate Graham 2024-01-17 15:46:56 UTC

This already exists, but the keyboard keys you need to hit are Ctrl+Meta scroll.

Comment 3 Christopher Smith 2024-01-19 03:32:58 UTC

(In reply to Nate Graham from comment #2)
> This already exists, but the keyboard keys you need to hit are Ctrl+Meta
> scroll.

I just found your blog post on this and it does seem interesting that this isn't documented anywhere in the UI yet. Didn't really look into it much before coming here, thanks for the info though!