We now keep track of keys in buddy_list.js, so that
when we insert/remove items, we no longer need to
traverse all the DOM. Instead, we just find out
which position in the list we need to insert the
key in (where "key" is "user_id") and then find
the relevant DOM node directly and insert the new
HTML before that node. (And of course we still
account for the "append" case.)
There's a little more bookkeeping to make this
happen, but it should help reduce some code in
upcoming commits and pave the way toward
progressive rendering optimizations.
This commit should produce a minor speedup
for activity-related events that go through
buddy_list.insert_or_move(), since we are
not traversing the DOM to find insertion points
any more.
This will be useful for lazy rendering, where our
buddy_list widget already knows the keys (aka "userids")
it wants to render as you start scrolling them into
view.
This commit prepares the frontend code to be consumed by webpack.
It is a hack: In theory, modules should be declaring and importing the
modules they depend on and the globals they expose directly.
However, that requires significant per-module work, which we don't
really want to block moving our toolchain to webpack on.
So we expose the modules by setting window.varName = varName; as
needed in the js files.
When we populate the buddy list or update it for activity, we now
have buddy_data set a faded flag that is rendered in the template.
This avoids some re-rendering overhead and is on the eventual path
to having our widget be more data-oriented (and all rendering happens
"behind" the widget).
We still do direct DOM updates when the compose state changes or
when we get peer subscription events.
A recent change filtered out offline users from the buddy list
whenever the list size would otherwise exceed 600.
This commit reverts half that change--we can now show 600+ users
again, but only when searching.
If we would have more than 600 people in a buddy list, it's kind of
cumbersome to scroll through it, and it's also expensive to render
it (short of doing progressive rendering, which adds a lot of
complexity).
So, as a short term measure, we filter out offline users whenever the
list would exceed 600 users. Note that if you are doing a search that
narrows to fewer 600 users, the offline users will appear again.
Steve Howell
Armaan Ahluwalia
Shubham Dhama
Tim Abbott