https://bugs.kde.org/show_bug.cgi?id=377562
Bug ID: 377562
Summary: protecting against accidental zooming
Product: frameworks-ktexteditor
Version: unspecified
Platform: Compiled Sources
OS: Linux
Status: UNCONFIRMED
Severity: wishlist
Priority: NOR
Component: general
Assignee: kwrite-bugs-n...@kde.org
Reporter: rjvber...@gmail.com
Target Milestone: ---
This is something I've brought up before but never with a real determination to
address the issue myself:
With Qt's default shortcut/action mapping, text editor documents built on
KTextEditor are prone to be victim of accidental zooming. Qt's standard for
this is Ctrl-Wheel events. This means that systems with a trackpad that use
2-finger scrolling and scroll inertia may cause text zooming when the user
holds presses the Ctrl key to trigger a shortcut (say, Ctrl-S to save the
current document) before coasting has stopped completely.
The end of coasting isn't always clear: scroll events may continue to come in
with sub-threshold deltas, or when the view has already reached its extreme
position and can scroll no further.
Qt itself has a form of protection against this kind of annoyance on Mac and
possibly other systems where inertial scrolling has better platform support
than under X11. But it's not very difficult to implement a similar protection
under X11; a proof of concept designed by Thomas Lübking and me:
https://github.com/RJVB/qtwheeltest/blob/master/wheeltest.cpp
I'd appreciate it if someone could have a look at and comment this approach
before I start integrating it with KTextEditor (if at all possible, I haven't
checked that yet).
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