We want to scroll the left sidebar to the top as soon as the user
zooms in on a stream, and we don't want to wait for the server,
otherwise we'll get jumpiness.
This commit is a bit complicated, because we do full redraws of
the topic list frequently, and we don't want to randomly obliterate
our "No more topics found" message, so we need to keep a bit of
extra state around.
We now use a template to render the "more topics" link.
We also remove an unnecessary conditional and an unnecessary
attribute.
Finally, our unit tests are a bit more granular now.
This will make testing a bit easier (we can stub stuff before
building the widget), and it will eventually give us more control
on redrawing the topic list.
We were parameterizing max_topics, but it made the calling sequences
unnecessarily complicated. We don't ever override the value, not
even in tests, so now we just set in build_list().
This puts build_list on the widget object, which will make it a
bit easier to unit test, and it's more consistent with the rest of
the function. This also reduces the scope of the `my_stream_name`
variable and moves the initialization of `self.topic_items` into
build_list.
If a user re-narrows to another stream before our server gives
us more topic history, or they zoom out, we can avoid drawing
the topic list. Note that our data structures will still be
updated, although the only time that really matters is for
the corner case of a low-traffic stream. For a low traffic
stream that only had 3 or 4 topics in the original message
fetch, but has longer history, the next time you open the
stream in the sidebar, even when you're zoomed out, you will
see more topics.
Despite a few warts, we are going forward with getting topic
history from the server when you click "more topics." This
commit simplifies the code by removing the feature flag
checks.
Variable `show_topic` was assigned in both branches of the
conditional, but the assignment in the "then" branch was useless,
since the variable wasn't subsequently read. Hence the assignment can
be dropped, leaving the "then" branch empty. The "if" statement can
then be simplified by removing the "then" branch entirely and flipping
the condition. Since `show_topic` is now only used inside the "if", it
is slightly tidier (though semantically equivalent) to move its
declaration inside.
Until we have an easy way to consistently determine whether a
stream has more topics than have been loaded already, we err
on the side of showing a "more topics" link. This in some ways
leads to a more consistent experience where you can zoom in on
any stream, even one that's really new.
This fix simplifies how we re-render topic lists when we
re-narrow or zoom out from a topic list.
* The topic_list.zoom_out() no longer gets called as
part of re-narrowing, and we eliminate the clear_topics
option.
* For all situations where we narrow to a filter that does
not have a topic, we simply call the new function
clear_topics().
* The stream_list code no longer calls remove_expanded_topics()
in cases where the new narrow has a topic. This allows us
to optimize away scroll/flicker churn a little more easily.
As part of this, we rename maybe_activate_stream_item() to
update_stream_sidebar_for_narrow(), since the function clears
stuff as well as turning stuff on.
If you go into "more topics" for a stream with many topics,
and then scroll down, and then zoom out again with "All
streams", we make sure the active stream is still in view.
This new module tracks the recent topic names for any given
stream.
The code was pulled over almost verbatim from stream_data.js,
with minor renames to the function names.
We introduced a minor one-line function called stream_has_topics.
We now have all of our callers into recent_topics code just
receive a list of topic names from get_recent_topic_names().
This is more encapsulated than handing off tiny little
structures to the three callers, two of whom immediately
mapped the objects to names, and one of whom needlessly
used the now defunct name canon_subject field.
The consolidation here removes some "subject" references, and
now all lookup are by stream id, not stream name.
The diff here is a bit daunting, but it's mostly simplification
of tests and calling code. Two of the callers now need to look
up stream ids, but they are otherwise streamlined.
The main change here is to stream_data.js, and we replace the
`canon_subject` and `subject` fields with `name`.
The function modals.is_active() can see if modals are open
without having to look at the DOM. This should make it snappier
to type in the compose box. Even if the speedup is pretty minor,
not having to worry about jQuery slowness should make it easier
to diagnose future compose box issues.
The new function gets used in other places, too, where performance
isn't so much an issue.
Despite the length of this commit, it is a very straightforward
moving of code from narrow.js -> narrow_state.js, and then
everything else is just s/narrow.foo()/narrow_state.foo()/
(with a few tiny cleanups to remove some code duplication
in certain callers).
The only new functions are simple setter/getters that
encapsulate the current_filter variable:
narrow_state.reset_current_filter()
narrow_state.set_current_filter()
narrow_state.get_current_filter()
We removed narrow.predicate() as part of this, since it was dead
code.
Also, we removed the shim for narrow_state.set_compose_defaults(),
and since that was the last shim, we removed shim.js from the app.
In this commit we fix the issue of scrollbar occasionally scrolling
down too far when we click more topics option. Upon scrolling to top
the scroll gets reset everything returns to normal. This sometimes
leads to big blank space upon clicking more topics. This has been
fixed by reseting the scroll upon narrowing.
Fixes: #4440.
This module handles the popovers in the stream list--one for
stream actions and another for topic-specific actions.
The extraction was mostly straightforward, but I did move some
of the code related to the color picker to be more consistent
with how I organized the other click handlers.
If you narrowed to a topic that was not one of the most recent 5
topics and had uppercase characters, it would disappear from the
topic list as soon as all of its messages were read.
If stream names weren't entirely lowercase, then our function
topic_list.is_for_stream() was improperly reporting false and
failing to update unread counts for the active topic widget.
This regression was probably introduced in the fairly recent
53eea250d0 commit.
Fixes#2330.
This function does the "heavy" lifting of updating an unread
count. (It's not exactly heavy lifting, but it makes it so
the parent just needs to find the outer element of the unread
div, using whatever method makes sense for the parent.)
The widget that gets built in topic_list.build_widget()
now knows how to add itself to its parent element and expose
an interface to retrieve the parent.
For cases where we are zoomed in to a stream and then go
to a different narrow (Home, PMs, etc.), we now let
topic_list.zoom_out orchestrate the removal of the topic list
instead of stream_list.zoom_out.
This will help us when we move to a world where topic_list
redraws topic lists on zoom-in/zoom-out, because we won't
waste effort rebuilding lists that are about to be removed.
The flow for topic list zooming is kind of complicated now, but
it's mostly a consequence of the way the UI works.
* stream_list tells topic_list to set up the topic list
click handlers to have callbacks to stream_list
* topic_list click handlers call to stream_list zoom methods
to hide/show all the other streams
* stream_list zoom methods call back to topic_list methods to
redraw topics as needed (this isn't happening yet, but allowing
topic_list.js to know that it's zoomed will set the stage for
this to happen in a more controlled manner)
This change makes most of the logic on set_count() live
on our per-stream topic list widget. We can find the
jQuery object directly now rather than using the
complicated iterate_to_find() method.
This also brought along:
iterate_to_find (copied, see large comment explaining why)
activate_topic (extracted from a one-liner)
set_count (formerly stream_list.set_subject_count)
For get_topic_filter_li, we now pass in stream_li instead of
stream to decouple parent/child responsibilities between the
components.
Also, I made some s/subject/topic/ fixes.
This creates the new topic_list.js module, and the first
function that we extract is topic_list.update_count_in_dom().
This function needed to be decoupled from some non-topic-list
stuff which was overly complicated.
Brock Whittaker
Tim Abbott
Steve Howell
Max Schaefer
Steve Howell
Rohitt Vashishtha
Aditya Bansal