https://bugzilla.wikimedia.org/show_bug.cgi?id=69414
Bug ID: 69414
Summary: Zoom and scroll gestures unusable on mobile browsers
Product: MediaWiki extensions
Version: unspecified
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: critical
Priority: Unprioritized
Component: MultimediaViewer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Web browser: ---
Mobile Platform: ---
On smartphones and other devices with small screens, it's essential to be able
to zoom into and scroll around images in order to see details. For instance,
Wikipedia has many maps whose legend and embedded labels are illegible on a
typical smartphone if zoomed all the way out. "Mobile" browsers universally
support gestures for zooming and scrolling (usually one-finger touch and swipe
to scroll, two-finger "pinch" / "stretch" to zoom).
If you try to use these gestures on a mobile browser displaying an image in the
MultimediaViewer, they do not work correctly. I've seen three different,
equally incorrect behaviors:
* On an iPhone, the zoom gesture did nothing at all (and it was therefore
impossible to test the scroll gestures).
* On Android (4.2) stock browser, zooming enlarges the image but also enlarges
the white bar at the bottom of the screen (in general, "chrome" like this
should be exempted from zooming) and the image is also displaced downward (the
image should not *move*, it should just *expand* under the user's fingers).
Worse, after zooming in, scrolling gestures had no effect (so it was impossible
to see anything but the top left hand corner of the image).
* Firefox for Android behaves the same as the Android stock browser, except
that the white bar at the bottom of the screen *migrates away from the bottom
of the screen* as well as enlarging.
On a Commons image-description page, by contrast, this works fine; the gestures
apply to the entire page, and the image is embedded in the page normally, so
the image is zoomable and scrollable.
I personally consider this a bug of sufficient severity to warrant disabling
the extension on all Wikipedias until it is fixed. There are a *lot* of mobile
users, and their numbers are growing.
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