Although native browser scroll restorations have become quite powerful, it interferes with Flarum's PostStream, so if we're on a DiscussionPage, we use manual scroll restoration.
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.
This prevents an edge case where `app.discussions` is considered empty while the new page is loading, and as a result, the side pane isn't set as "enabled". Then, if the pane has previously been pinned, when the page loads and the side pane appears, it covers up part of the discussion page.
Fixes https://github.com/flarum/core/issues/2471
- Reintroduce cancellable scroll top on page change
- IndexPage: rely on browser to retain scroll position on page reload
- Remove obsolete browser hack
- Fix broken selector
- When on mobile, only retain scroll for IndexPage if we're coming from a discussion
- Move app.cache.scrollTop save into `onbeforeremove` so we make sure to do it before DOM is detached
The default first post number is '1', so we scroll to that if we're calling `m.route.set` without a `near` parameter, as that means we're scrolling to the top.
This was present in beta 13's implementation, but accidentially omitted in 988b6c9.
We also remove unnecessary typecasting for simpler logic and increased consistency with beta 13.
The current implementation for checking whether we are on a discussion page, and going to a discussion page, checks the route we are going to. This is problematic, because the route resolver represents the route being considered, not the route we are currently on. So, if we are currently using a DiscussionPageResolver, we must be going to a route handled by DiscussionPage. Instead, we need to check the route that we are currently on, which is done via `app.current.matches(DiscussionPage)`.
- mapRoutes: don't wrap components in resolvers if they are already resolvers
- Extract defaultResolver into its own class
- Allow either route resolver instances, or components with an optional resolverClass which should accept the component and route name in its constructor.
- Introduce a resolver for DiscussionPage, so that routing from one post to another on the same discussion triggers a scroll instead of rerendering
- 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>
Essentially, whenever a route is loaded, we add a key to that component. If the key changes, the page completely rerenders. Switching between different routes handled by the same key triggers those rerenders.
- If the fadeIn animation is specified on the PostStream class itself, any time we add/remove another animation, it will redo fadeIn. To avoid this, we move fadeIn into it's own css class, which is applied, and then immediately removed after the animation is completed to ensure it only runs once.
- The "fix" for flashItem was actually broken, as it resulted in 'flash' never being removed, so we never went back to .PostStream's fadeIn. We adjust flashItem to ensure that '.flash' is removed. We also remove 'fadeIn' in case it hasn't yet been removed in oncreate.
Make header and navigation components redraw after page components. Page components manipulate the header (state), but the header redraws before the page on route change. By changing the mount order, we change also the redraw order.
When on a discussion page, the URL changing doesn't always mean we've moved to a different page. In our custom rerender logic, we only want to call `this.onNewRoute()` if the page has actually changed.
After we scroll to a post, we redraw to render post content. We then update the scrubber again so its height is accurate. This commit moves that update to AFTER our adjustment of scroll position, so that scrubber height is based on actual post heights. This fixes some subtle scrubber glitches.
Currently, the controls are on a new line due to the container div. We want to wrap ALL children of the alert, including the controls, in the container div.
We need to split it into a separate class so that we can add modify the alert vnode AFTER the alert component's `view` logic has been applied.
- 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.
- Call onNewRoute when page changed with same component in DiscussionPage and UserPage
- Make app.previous and app.current changed in onNewRoute, not in oninit. This way, when the route is changed, but still handled by the same component, a new PageState object will still be created.
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.
Because the Slidable class was always added on creation, it was lost every time the class list changed (in this case when the discussion was hidden/unhidden which added/removed DiscussionListItem--hidden class). So by determining the Slidable class's presence in elementAttrs() method, it guarantees it always properly set.
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>
