In the PostStream, `this.visibleEnd` represents the index of the last post + 1, but `loadNearIndex` treated it as if it was the index of the last post. This means that executing `goToIndex` on the post stream's current `this.visiblePost` didn't load new posts, and as a result, the requested scrolling did not occur.
- Add an index to reply placeholder so we can scroll to it directly when replying.
- Stop pretending that the currently broken `bottom` scroll functionality works, and explicitly call it `reply` scrolling to be clearer
- Directly get target from state
- Explicitly scroll to placeholder on reply
- Clean up scrollToItem code a bit
- Account for edge case where index is undefined when scrolling to post
Co-authored-by: Wadim Kalmykov <36057469+w-4@users.noreply.github.com>
- Ensure that the discussion list is cleared before it is updated with fetched results
- Rename `clear` to `deferClear`, improve documentation to make its purpose clearer.
While more pleasant from an FSM standpoint, comparing the current targetPost to the previous one does not work if goToNumber is called twice in a row for the same post. For instance, if a user clicks the mentions link to a post twice, the post stream breaks.
In some cases, such as if we've stickied a post, an event post
may have been added / removed.This means that `this.visibleEnd`
and`this.count()` will be out of sync by 1 post, but we are still
"viewing the end" of the post stream, so we should still reload
all posts up until the last one.
When the page is scrolled, goToIndex is called, or the page is loaded,
various listeners result in the scrubber being updated with a new
position and values. However, if goToNumber is called, the scrubber
will not be updated. Accordingly, we add logic to the scrubber's
onupdate to update itself, but only when needed, as indicated by this
This saves us a LOT of unnecessary calls, and makes scrubber movement smoother.
* Update frontend to Mithril 2
- Update Mithril version to v2.0.4
- Add Typescript typings for Mithril
- Rename "props" to "attrs"; "initProps" to "initAttrs"; "m.prop" to "m.stream"; "m.withAttr" to "utils/withAttr".
- Use Mithril 2's new lifecycle hooks
- SubtreeRetainer has been rewritten to be more useful for the new system
- Utils for forcing page re-initializations have been added (force attr in links, setRouteWithForcedRefresh util)
- Other mechanical changes, following the upgrade guide
- Remove some of the custom stuff in our Component base class
- Introduce "fragments" for non-components that control their own DOM
- Remove Mithril patches, introduce a few new ones (route attrs in <a>;
- Redesign AlertManagerState `show` with 3 overloads: `show(children)`, `show(attrs, children)`, `show(componentClass, attrs, children)`
- The `affixedSidebar` util has been replaced with an `AffixedSidebar` component
Challenges:
- `children` and `tag` are now reserved, and can not be used as attr names
- Behavior of links to current page changed in Mithril. If moving to a page that is handled by the same component, the page component WILL NOT be re-initialized by default. Additional code to keep track of the current url is needed (See IndexPage, DiscussionPage, and UserPage for examples)
- Native Promise rejections are shown on console when not handled
- Instances of components can no longer be stored. The state pattern should be used instead.
Refs #1821.
Co-authored-by: Alexander Skvortsov <sasha.skvortsov109@gmail.com>
Co-authored-by: Matthew Kilgore <tankerkiller125@gmail.com>
Co-authored-by: Franz Liedke <franz@develophp.org>
This is needed to have access to the newly created SuperTextarea
instance (app.composer.editor) directly after calling show().
Discovered when making ext-mentions work with the Composer state
changes. As far as I could reconstruct, a synchronous redraw was also
triggered in this situation before the changes in #2161.
Like previous "state PRs", this moves app-wide logic relating to
our "composer" widget to its own "state" class, which can be
referenced and called from all parts of the app. This lets us
avoid storing component instances, which we cannot do any longer
once we update to Mithril v2.
This was not as trivial as some of the other state changes, as we
tried to separate DOM effects (e.g. animations) from actual state
changes (e.g. minimizing or opening the composer).
New features:
- A new `app.screen()` method returns the current responsive screen
mode. This lets us check what breakpoint we're on in JS land
without hardcoding / duplicating the actual breakpoints from CSS.
- A new `SuperTextarea` util exposes useful methods for directly
interacting with and manipulating the text contents of e.g. our
post editor.
- A new `ConfirmDocumentUnload` wrapper component encapsulates the
logic for asking the user for confirmation when trying to close
the browser window or navigating to another page. This is used in
the composer to prevent accidentally losing unsaved post content.
There is still potential for future cleanups, but we finally want
to unblock the Mithril update, so these will have to wait:
- Composer height change logic is very DOM-based, so should maybe
not sit in the state.
- I would love to experiment with using composition rather than
inheritance for the `ComposerBody` subclasses.
- Encapsulate app.current, app.previous in PageState objects
- Reorganize Page classes to use one central base class in common
Co-authored-by: Franz Liedke <franz@develophp.org>
