The new file kiwix.css is intended to host the intersection of index.css
and taskbar.css. In this commit only font definitions have been moved
into it.
After upgrading my OS to Ubuntu 22.04 the language selector button
didn't show up in the viewer taskbar. Investigation shows that the id
used in the CSS was applied to the wrong HTML element (the enclosing
<a> rather than <img>).
The previous "fix" (merged PR #924) was buggy. It not only didn't work
in Chromium v90, but in more recent versions too.
I verified that this fix works in Firefox (v111) and Chromium (v90):
- Attempts by the ZIM content to break out of the viewer iframe are
blocked.
- PDFs are displayed in the viewer.
Added cursor type and hints to the UI language selection button. The
hints are always in English since seeing a hint in an unfamiliar language
doesn't help and English is the current lingua franca.
This prevents scripts running inside an iframe from inadvertently
manipulating the top browsing context. However a malicious script could
still remove the sandboxing imposed on it (because the combination of
"allow-same-origin" and "allow-scripts" is vulnerable).
The recently introduced ZIM viewer UI language selector looked
adequately nice under Firefox without any explicit styling applied.
Under SeaMonkey, however, its default look and feel was intolerable, so
I used this opportunity to make the UI language selector comply with the
current fashion of the ZIM viewer toolbar.
Known issues
- styling / placement
- language changes via the selector UI are not recorded in the
navigation history
- changing the language via the UI doesn't update the `?userlang=` URL
query parameter
ZIM viewer is now internally internationalized but the UI language
can only be set by providing the `userlang` query parameter in the URL:
Example:
/viewer?userlang=fr#wikipedia_en_climate_change_mini_2021-03/A/index
^^^^^^^^^^^^
One (hopefully, last) remaining relative URL to a static resource
is the reference to ./search-icon.svg found in skin/index.css to which
KIWIXCACHEID could not be applied because of the limitations of the
resource preprocessing script `kiwix-resources`.
If `kiwix-serve` is run with the `--nosearchbar` option the toolbar is
disabled (hidden) in its viewer.
Note however that certain actions performed by the viewer merely with
the purpose of keeping the toolbar up-to-date are still carried out.
Auto hiding of the toolbars on narrow screens works only for the first
page loaded in the viewer. Navigating to other pages interferes with
autohiding as follows:
- If the toolbar was hidden, it stays hidden.
- If the toolbar was not hidden, it loses the ability to autohide.
Made the viewer respect the `--blockexternal` and `--nolibrarybutton`
options of `kiwix-serve`. Those options are passed to the viewer
via the dynamically generated resource `/viewer_settings.js`.
The greenish taskbar placeholder is gone. The appearance of the old taskbar
is restored. However the taskbar currently contains only the library
button (but the latter leads to the currently blank welcome page).
Before this fix, browsing history didn't work at all. Now it mostly
works but there are still some quirks that must be debugged further.
Since session history handling turns out to be a rather complex topic
(see https://html.spec.whatwg.org/multipage/history.html) the work in
that direction will be postponed until other features reach a comparable
level of readiness.
