126 строки
4.3 KiB
JavaScript
126 строки
4.3 KiB
JavaScript
// Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
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// See License.txt for license information.
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import * as EventHelpers from '../../dispatcher/event_helpers.jsx';
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import SuggestionStore from '../../stores/suggestion_store.jsx';
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export default class SuggestionList extends React.Component {
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constructor(props) {
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super(props);
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this.getContent = this.getContent.bind(this);
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this.handleItemClick = this.handleItemClick.bind(this);
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this.handleSuggestionsChanged = this.handleSuggestionsChanged.bind(this);
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this.scrollToItem = this.scrollToItem.bind(this);
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this.state = {
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items: [],
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terms: [],
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components: [],
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selection: ''
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};
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}
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componentDidMount() {
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SuggestionStore.addSuggestionsChangedListener(this.props.suggestionId, this.handleSuggestionsChanged);
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}
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componentWillUnmount() {
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SuggestionStore.removeSuggestionsChangedListener(this.props.suggestionId, this.handleSuggestionsChanged);
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}
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getContent() {
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return $(ReactDOM.findDOMNode(this.refs.content));
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}
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handleItemClick(term, e) {
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EventHelpers.emitCompleteWordSuggestion(this.props.suggestionId, term);
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e.preventDefault();
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}
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handleSuggestionsChanged() {
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const selection = SuggestionStore.getSelection(this.props.suggestionId);
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this.setState({
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items: SuggestionStore.getItems(this.props.suggestionId),
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terms: SuggestionStore.getTerms(this.props.suggestionId),
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components: SuggestionStore.getComponents(this.props.suggestionId),
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selection
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});
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if (selection) {
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window.requestAnimationFrame(() => this.scrollToItem(this.state.selection));
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}
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}
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scrollToItem(term) {
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const content = this.getContent();
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const visibleContentHeight = content[0].clientHeight;
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const actualContentHeight = content[0].scrollHeight;
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if (visibleContentHeight < actualContentHeight) {
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const contentTop = content.scrollTop();
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const contentTopPadding = parseInt(content.css('padding-top'), 10);
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const contentBottomPadding = parseInt(content.css('padding-top'), 10);
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const item = $(ReactDOM.findDOMNode(this.refs[term]));
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const itemTop = item[0].offsetTop - parseInt(item.css('margin-top'), 10);
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const itemBottomMargin = parseInt(item.css('margin-bottom'), 10) + parseInt(item.css('padding-bottom'), 10);
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const itemBottom = item[0].offsetTop + item.height() + itemBottomMargin;
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if (itemTop - contentTopPadding < contentTop) {
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// the item is off the top of the visible space
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content.scrollTop(itemTop - contentTopPadding);
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} else if (itemBottom + contentTopPadding + contentBottomPadding > contentTop + visibleContentHeight) {
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// the item has gone off the bottom of the visible space
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content.scrollTop(itemBottom - visibleContentHeight + contentTopPadding + contentBottomPadding);
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}
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}
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}
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render() {
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if (this.state.items.length === 0) {
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return null;
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}
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const items = [];
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for (let i = 0; i < this.state.items.length; i++) {
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const item = this.state.items[i];
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const term = this.state.terms[i];
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const isSelection = term === this.state.selection;
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// ReactComponent names need to be upper case when used in JSX
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const Component = this.state.components[i];
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items.push(
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<Component
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key={term}
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ref={term}
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item={item}
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term={term}
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isSelection={isSelection}
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onClick={this.handleItemClick.bind(this, term)}
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/>
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);
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}
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return (
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<div className='suggestion-list suggestion-list--top'>
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<div
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ref='content'
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className='suggestion-content suggestion-content--top'
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>
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{items}
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</div>
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</div>
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);
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}
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}
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SuggestionList.propTypes = {
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suggestionId: React.PropTypes.string.isRequired
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};
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