Fix timeline jumps (#10001)

* Avoid two-step rendering of statuses as much as possible Cache width shared by Video player, MediaGallery and Cards at the ScrollableList level, pass it down through StatusList and Notifications. * Adjust scroll when new preview cards appear * Adjust scroll when statuses above the current scroll position are deleted
2019-02-11 13:19:59 +01:00 · 2019-02-11 13:19:59 +01:00 · 98642fef2a
parent d25756990a
commit 98642fef2a
6 changed files with 134 additions and 12 deletions
--- a/app/javascript/mastodon/components/media_gallery.js
+++ b/app/javascript/mastodon/components/media_gallery.js
@ -194,6 +194,8 @@ class MediaGallery extends React.PureComponent {
    height: PropTypes.number.isRequired,
    onOpenMedia: PropTypes.func.isRequired,
    intl: PropTypes.object.isRequired,
+    defaultWidth: PropTypes.number,
+    cacheWidth: PropTypes.func,
  };

  static defaultProps = {
@ -202,6 +204,7 @@ class MediaGallery extends React.PureComponent {

  state = {
    visible: displayMedia !== 'hide_all' && !this.props.sensitive || displayMedia === 'show_all',
+    width: this.props.defaultWidth,
  };

  componentWillReceiveProps (nextProps) {
@ -221,6 +224,7 @@ class MediaGallery extends React.PureComponent {
  handleRef = (node) => {
    if (node /*&& this.isStandaloneEligible()*/) {
      // offsetWidth triggers a layout, so only calculate when we need to
+      if (this.props.cacheWidth) this.props.cacheWidth(node.offsetWidth);
      this.setState({
        width: node.offsetWidth,
      });
@ -233,8 +237,10 @@ class MediaGallery extends React.PureComponent {
  }

  render () {
-    const { media, intl, sensitive, height } = this.props;
-    const { width, visible } = this.state;
+    const { media, intl, sensitive, height, defaultWidth } = this.props;
+    const { visible } = this.state;
+
+    const width = this.state.width || defaultWidth;

    let children;

--- a/app/javascript/mastodon/components/scrollable_list.js
+++ b/app/javascript/mastodon/components/scrollable_list.js
@ -40,6 +40,7 @@ export default class ScrollableList extends PureComponent {

  state = {
    fullscreen: null,
+    cachedMediaWidth: 250, // Default media/card width using default Mastodon theme
  };

  intersectionObserverWrapper = new IntersectionObserverWrapper();
@ -130,6 +131,20 @@ export default class ScrollableList extends PureComponent {
    this.handleScroll();
  }

+  getScrollPosition = () => {
+    if (this.node && (this.node.scrollTop > 0 || this.mouseMovedRecently)) {
+      return { height: this.node.scrollHeight, top: this.node.scrollTop };
+    } else {
+      return null;
+    }
+  }
+
+  updateScrollBottom = (snapshot) => {
+    const newScrollTop = this.node.scrollHeight - snapshot;
+
+    this.setScrollTop(newScrollTop);
+  }
+
  getSnapshotBeforeUpdate (prevProps) {
    const someItemInserted = React.Children.count(prevProps.children) > 0 &&
      React.Children.count(prevProps.children) < React.Children.count(this.props.children) &&
@ -150,6 +165,12 @@ export default class ScrollableList extends PureComponent {
    }
  }

+  cacheMediaWidth = (width) => {
+    if (width && this.state.cachedMediaWidth !== width) {
+      this.setState({ cachedMediaWidth: width });
+    }
+  }
+
  componentWillUnmount () {
    this.clearMouseIdleTimer();
    this.detachScrollListener();
@ -239,7 +260,12 @@ export default class ScrollableList extends PureComponent {
                intersectionObserverWrapper={this.intersectionObserverWrapper}
                saveHeightKey={trackScroll ? `${this.context.router.route.location.key}:${scrollKey}` : null}
              >
-                {child}
+                {React.cloneElement(child, {
+                  getScrollPosition: this.getScrollPosition,
+                  updateScrollBottom: this.updateScrollBottom,
+                  cachedMediaWidth: this.state.cachedMediaWidth,
+                  cacheMediaWidth: this.cacheMediaWidth,
+                })}
              </IntersectionObserverArticleContainer>
            ))}

--- a/app/javascript/mastodon/components/status.js
+++ b/app/javascript/mastodon/components/status.js
@ -69,6 +69,10 @@ class Status extends ImmutablePureComponent {
    onMoveUp: PropTypes.func,
    onMoveDown: PropTypes.func,
    showThread: PropTypes.bool,
+    getScrollPosition: PropTypes.func,
+    updateScrollBottom: PropTypes.func,
+    cacheMediaWidth: PropTypes.func,
+    cachedMediaWidth: PropTypes.number,
  };

  // Avoid checking props that are functions (and whose equality will always
@ -80,6 +84,43 @@ class Status extends ImmutablePureComponent {
    'hidden',
  ];

+  // Track height changes we know about to compensate scrolling
+  componentDidMount () {
+    this.didShowCard = !this.props.muted && !this.props.hidden && this.props.status.get('card');
+  }
+
+  getSnapshotBeforeUpdate () {
+    if (this.props.getScrollPosition) {
+      return this.props.getScrollPosition();
+    } else {
+      return null;
+    }
+  }
+
+  // Compensate height changes
+  componentDidUpdate (prevProps, prevState, snapshot) {
+    const doShowCard  = !this.props.muted && !this.props.hidden && this.props.status.get('card');
+    if (doShowCard && !this.didShowCard) {
+      this.didShowCard = true;
+      if (snapshot !== null && this.props.updateScrollBottom) {
+        if (this.node && this.node.offsetTop < snapshot.top) {
+          this.props.updateScrollBottom(snapshot.height - snapshot.top);
+        }
+      }
+    }
+  }
+
+  componentWillUnmount() {
+    if (this.node && this.props.getScrollPosition) {
+      const position = this.props.getScrollPosition();
+      if (position !== null && this.node.offsetTop < position.top) {
+        requestAnimationFrame(() => {
+          this.props.updateScrollBottom(position.height - position.top);
+        });
+      }
+    }
+  }
+
  handleClick = () => {
    if (this.props.onClick) {
      this.props.onClick();
@ -166,6 +207,10 @@ class Status extends ImmutablePureComponent {
    }
  }

+  handleRef = c => {
+    this.node = c;
+  }
+
  render () {
    let media = null;
    let statusAvatar, prepend, rebloggedByText;
@ -180,7 +225,7 @@ class Status extends ImmutablePureComponent {

    if (hidden) {
      return (
-        <div>
+        <div ref={this.handleRef}>
          {status.getIn(['account', 'display_name']) || status.getIn(['account', 'username'])}
          {status.get('content')}
        </div>
@ -195,7 +240,7 @@ class Status extends ImmutablePureComponent {

      return (
        <HotKeys handlers={minHandlers}>
-          <div className='status__wrapper status__wrapper--filtered focusable' tabIndex='0'>
+          <div className='status__wrapper status__wrapper--filtered focusable' tabIndex='0' ref={this.handleRef}>
            <FormattedMessage id='status.filtered' defaultMessage='Filtered' />
          </div>
        </HotKeys>
@ -243,11 +288,12 @@ class Status extends ImmutablePureComponent {
                preview={video.get('preview_url')}
                src={video.get('url')}
                alt={video.get('description')}
-                width={239}
+                width={this.props.cachedMediaWidth}
                height={110}
                inline
                sensitive={status.get('sensitive')}
                onOpenVideo={this.handleOpenVideo}
+                cacheWidth={this.props.cacheMediaWidth}
              />
            )}
          </Bundle>
@ -255,7 +301,16 @@ class Status extends ImmutablePureComponent {
      } else {
        media = (
          <Bundle fetchComponent={MediaGallery} loading={this.renderLoadingMediaGallery}>
-            {Component => <Component media={status.get('media_attachments')} sensitive={status.get('sensitive')} height={110} onOpenMedia={this.props.onOpenMedia} />}
+            {Component => (
+              <Component
+                media={status.get('media_attachments')}
+                sensitive={status.get('sensitive')}
+                height={110}
+                onOpenMedia={this.props.onOpenMedia}
+                cacheWidth={this.props.cacheMediaWidth}
+                defaultWidth={this.props.cachedMediaWidth}
+              />
+            )}
          </Bundle>
        );
      }
@ -265,6 +320,8 @@ class Status extends ImmutablePureComponent {
          onOpenMedia={this.props.onOpenMedia}
          card={status.get('card')}
          compact
+          cacheWidth={this.props.cacheMediaWidth}
+          defaultWidth={this.props.cachedMediaWidth}
        />
      );
    }
@ -291,7 +348,7 @@ class Status extends ImmutablePureComponent {

    return (
      <HotKeys handlers={handlers}>
-        <div className={classNames('status__wrapper', `status__wrapper-${status.get('visibility')}`, { 'status__wrapper-reply': !!status.get('in_reply_to_id'), read: unread === false, focusable: !this.props.muted })} tabIndex={this.props.muted ? null : 0} data-featured={featured ? 'true' : null} aria-label={textForScreenReader(intl, status, rebloggedByText, !status.get('hidden'))}>
+        <div className={classNames('status__wrapper', `status__wrapper-${status.get('visibility')}`, { 'status__wrapper-reply': !!status.get('in_reply_to_id'), read: unread === false, focusable: !this.props.muted })} tabIndex={this.props.muted ? null : 0} data-featured={featured ? 'true' : null} aria-label={textForScreenReader(intl, status, rebloggedByText, !status.get('hidden'))} ref={this.handleRef}>
          {prepend}

          <div className={classNames('status', `status-${status.get('visibility')}`, { 'status-reply': !!status.get('in_reply_to_id'), muted: this.props.muted, read: unread === false })} data-id={status.get('id')}>
--- a/app/javascript/mastodon/features/notifications/components/notification.js
+++ b/app/javascript/mastodon/features/notifications/components/notification.js
@ -35,6 +35,10 @@ class Notification extends ImmutablePureComponent {
    onToggleHidden: PropTypes.func.isRequired,
    status: PropTypes.option,
    intl: PropTypes.object.isRequired,
+    getScrollPosition: PropTypes.func,
+    updateScrollBottom: PropTypes.func,
+    cacheMediaWidth: PropTypes.func,
+    cachedMediaWidth: PropTypes.number,
  };

  handleMoveUp = () => {
@ -129,6 +133,10 @@ class Notification extends ImmutablePureComponent {
        onMoveDown={this.handleMoveDown}
        onMoveUp={this.handleMoveUp}
        contextType='notifications'
+        getScrollPosition={this.props.getScrollPosition}
+        updateScrollBottom={this.props.updateScrollBottom}
+        cachedMediaWidth={this.props.cachedMediaWidth}
+        cacheMediaWidth={this.props.cacheMediaWidth}
      />
    );
  }
@ -149,7 +157,17 @@ class Notification extends ImmutablePureComponent {
            </span>
          </div>

-          <StatusContainer id={notification.get('status')} account={notification.get('account')} muted withDismiss hidden={!!this.props.hidden} />
+          <StatusContainer
+            id={notification.get('status')}
+            account={notification.get('account')}
+            muted
+            withDismiss
+            hidden={!!this.props.hidden}
+            getScrollPosition={this.props.getScrollPosition}
+            updateScrollBottom={this.props.updateScrollBottom}
+            cachedMediaWidth={this.props.cachedMediaWidth}
+            cacheMediaWidth={this.props.cacheMediaWidth}
+          />
        </div>
      </HotKeys>
    );
@ -171,7 +189,17 @@ class Notification extends ImmutablePureComponent {
            </span>
          </div>

-          <StatusContainer id={notification.get('status')} account={notification.get('account')} muted withDismiss hidden={this.props.hidden} />
+          <StatusContainer
+            id={notification.get('status')}
+            account={notification.get('account')}
+            muted
+            withDismiss
+            hidden={this.props.hidden}
+            getScrollPosition={this.props.getScrollPosition}
+            updateScrollBottom={this.props.updateScrollBottom}
+            cachedMediaWidth={this.props.cachedMediaWidth}
+            cacheMediaWidth={this.props.cacheMediaWidth}
+          />
        </div>
      </HotKeys>
    );
--- a/app/javascript/mastodon/features/status/components/card.js
+++ b/app/javascript/mastodon/features/status/components/card.js
@ -61,6 +61,8 @@ export default class Card extends React.PureComponent {
    maxDescription: PropTypes.number,
    onOpenMedia: PropTypes.func.isRequired,
    compact: PropTypes.bool,
+    defaultWidth: PropTypes.number,
+    cacheWidth: PropTypes.func,
  };

  static defaultProps = {
@ -69,7 +71,7 @@ export default class Card extends React.PureComponent {
  };

  state = {
-    width: 280,
+    width: this.props.defaultWidth || 280,
    embedded: false,
  };

@ -112,6 +114,7 @@ export default class Card extends React.PureComponent {

  setRef = c => {
    if (c) {
+      if (this.props.cacheWidth) this.props.cacheWidth(c.offsetWidth);
      this.setState({ width: c.offsetWidth });
    }
  }
--- a/app/javascript/mastodon/features/video/index.js
+++ b/app/javascript/mastodon/features/video/index.js
@ -100,6 +100,7 @@ class Video extends React.PureComponent {
    onCloseVideo: PropTypes.func,
    detailed: PropTypes.bool,
    inline: PropTypes.bool,
+    cacheWidth: PropTypes.func,
    intl: PropTypes.object.isRequired,
  };

@ -109,7 +110,7 @@ class Video extends React.PureComponent {
    volume: 0.5,
    paused: true,
    dragging: false,
-    containerWidth: false,
+    containerWidth: this.props.width,
    fullscreen: false,
    hovered: false,
    muted: false,
@ -129,6 +130,7 @@ class Video extends React.PureComponent {
    this.player = c;

    if (c) {
+      if (this.props.cacheWidth) this.props.cacheWidth(this.player.offsetWidth);
      this.setState({
        containerWidth: c.offsetWidth,
      });