parent
4b460bc571
commit
baa8b82179
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@ -27,6 +27,10 @@ export default class ScrollableList extends PureComponent {
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trackScroll: true,
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};
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state = {
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lastMouseMove: null,
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};
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intersectionObserverWrapper = new IntersectionObserverWrapper();
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handleScroll = throttle(() => {
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@ -47,6 +51,14 @@ export default class ScrollableList extends PureComponent {
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trailing: true,
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});
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handleMouseMove = throttle(() => {
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this.setState({ lastMouseMove: new Date() });
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}, 300);
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handleMouseLeave = () => {
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this.setState({ lastMouseMove: null });
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}
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componentDidMount () {
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this.attachScrollListener();
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this.attachIntersectionObserver();
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@ -58,9 +70,10 @@ export default class ScrollableList extends PureComponent {
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componentDidUpdate (prevProps) {
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// Reset the scroll position when a new child comes in in order not to
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// jerk the scrollbar around if you're already scrolled down the page.
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if (React.Children.count(prevProps.children) < React.Children.count(this.props.children) && this._oldScrollPosition && this.node.scrollTop > 0) {
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if (React.Children.count(prevProps.children) < React.Children.count(this.props.children) && this._oldScrollPosition && (this.node.scrollTop > 0 || this._recentlyMoved())) {
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if (this.getFirstChildKey(prevProps) !== this.getFirstChildKey(this.props)) {
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const newScrollTop = this.node.scrollHeight - this._oldScrollPosition;
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if (this.node.scrollTop !== newScrollTop) {
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this.node.scrollTop = newScrollTop;
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}
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@ -114,6 +127,10 @@ export default class ScrollableList extends PureComponent {
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this.props.onScrollToBottom();
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}
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_recentlyMoved () {
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return this.state.lastMouseMove === null || ((new Date()) - this.state.lastMouseMove < 600);
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}
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handleKeyDown = (e) => {
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if (['PageDown', 'PageUp'].includes(e.key) || (e.ctrlKey && ['End', 'Home'].includes(e.key))) {
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const article = (() => {
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@ -149,7 +166,7 @@ export default class ScrollableList extends PureComponent {
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if (isLoading || childrenCount > 0 || !emptyMessage) {
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scrollableArea = (
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<div className='scrollable' ref={this.setRef}>
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<div className='scrollable' ref={this.setRef} onMouseMove={this.handleMouseMove} onMouseLeave={this.handleMouseLeave}>
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<div role='feed' className='item-list' onKeyDown={this.handleKeyDown}>
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{prepend}
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