Review Request 120319: Make Kate mousewheel zoom feature respect the corresponding global setting (KGlobalSettings::wheelMouseZooms())

[René J.V. Bertin]

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https://git.reviewboard.kde.org/r/120319/
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(Updated Aug. 28, 2016, 12:35 p.m.)


Status
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This change has been discarded.


Review request for Kate, KDE Software on Mac OS X and kdelibs.


Repository: kate


Description
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KDE has a global text editor option that can be used to let Ctrl-MouseWheel events zoom the text font being used. Kate does not respect this setting, which is an omission that can lead to unexpected behaviour.

On OS X, the feature works slightly differently in the sense that `Qt::ControlModifier` does not designate the control key, but the command (?, Apple) key. In addition, Qt's event handling does not appear to be able to distinguish between scrolling under direct control, and residual scroll movement that's due to simulated inertia. As a result, any attempt to use a keyboard shortcut while a text view has not stopped moving completely will lead to text zooming.
See https://bugreports.qt-project.org/browse/QTBUG-41475 .

At first I thought to replace `Qt::ControlModifier` with `Qt::MetaModifier` on OS X but that would probably require changes in many locations, and thus best be preceded by a design decision if the standard shortcut modifier key ought not be referenced via a symbolic platform constant not named after a specific key, instead of being hardcoded (and using a key name).

Therefore, I present a small patch that checks `KGlobalSettings::wheelMouseZooms()` when the platform's `ControlModifier` is held and a wheel event received.

An alternative solution could introduce a Kate-specific setting (just like Konsole has one), but that would require far more changes.


Diffs
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  part/view/kateviewinternal.cpp a2906f3 

Diff: https://git.reviewboard.kde.org/r/120319/diff/


Testing
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On OS X against kdelibs 4.14.1 (git/kde4). The change consists of an additional call to a standard kdelibs function which I do not expect to introduce regressions on any platform.

I looked at kate's git/master code, which lacks a `wheelEvent` handler suggesting the feature works differently there. However, Qt 5.3.1 applications (like Digia's own Qt Creator) still suffer from the phenomenon described above, so a fix would be beneficial for KF5 too)


File Attachments
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Qt4 patch to prevent unwanted/unexpected text zoom while scrolling
  https://git.reviewboard.kde.org/media/uploaded/files/2015/09/03/ae8f63f3-4289-40bb-8b97-61a934bb33ec__patch-avoid-unwanted-fontzooming.diff


Thanks,

René J.V. Bertin

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