import React from 'react'; import AutosuggestAccountContainer from '../features/compose/containers/autosuggest_account_container'; import ImmutablePropTypes from 'react-immutable-proptypes'; import PropTypes from 'prop-types'; import { isRtl } from '../rtl'; import ImmutablePureComponent from 'react-immutable-pure-component'; const textAtCursorMatchesToken = (str, caretPosition) => { let word; let left = str.slice(0, caretPosition).search(/\S+$/); let right = str.slice(caretPosition).search(/\s/); if (right < 0) { word = str.slice(left); } else { word = str.slice(left, right + caretPosition); } if (!word || word.trim().length < 2 || word[0] !== '@') { return [null, null]; } word = word.trim().toLowerCase().slice(1); if (word.length > 0) { return [left + 1, word]; } else { return [null, null]; } }; class AutosuggestTextarea extends ImmutablePureComponent { constructor (props, context) { super(props, context); this.state = { suggestionsHidden: false, selectedSuggestion: 0, lastToken: null, tokenStart: 0 }; this.onChange = this.onChange.bind(this); this.onKeyDown = this.onKeyDown.bind(this); this.onBlur = this.onBlur.bind(this); this.onSuggestionClick = this.onSuggestionClick.bind(this); this.setTextarea = this.setTextarea.bind(this); this.onPaste = this.onPaste.bind(this); } onChange (e) { const [ tokenStart, token ] = textAtCursorMatchesToken(e.target.value, e.target.selectionStart); if (token !== null && this.state.lastToken !== token) { this.setState({ lastToken: token, selectedSuggestion: 0, tokenStart }); this.props.onSuggestionsFetchRequested(token); } else if (token === null) { this.setState({ lastToken: null }); this.props.onSuggestionsClearRequested(); } // auto-resize textarea e.target.style.height = `${e.target.scrollHeight}px`; this.props.onChange(e); } onKeyDown (e) { const { suggestions, disabled } = this.props; const { selectedSuggestion, suggestionsHidden } = this.state; if (disabled) { e.preventDefault(); return; } switch(e.key) { case 'Escape': if (!suggestionsHidden) { e.preventDefault(); this.setState({ suggestionsHidden: true }); } break; case 'ArrowDown': if (suggestions.size > 0 && !suggestionsHidden) { e.preventDefault(); this.setState({ selectedSuggestion: Math.min(selectedSuggestion + 1, suggestions.size - 1) }); } break; case 'ArrowUp': if (suggestions.size > 0 && !suggestionsHidden) { e.preventDefault(); this.setState({ selectedSuggestion: Math.max(selectedSuggestion - 1, 0) }); } break; case 'Enter': case 'Tab': // Select suggestion if (this.state.lastToken !== null && suggestions.size > 0 && !suggestionsHidden) { e.preventDefault(); e.stopPropagation(); this.props.onSuggestionSelected(this.state.tokenStart, this.state.lastToken, suggestions.get(selectedSuggestion)); } break; } if (e.defaultPrevented || !this.props.onKeyDown) { return; } this.props.onKeyDown(e); } onBlur () { // If we hide the suggestions immediately, then this will prevent the // onClick for the suggestions themselves from firing. // Setting a short window for that to take place before hiding the // suggestions ensures that can't happen. setTimeout(() => { this.setState({ suggestionsHidden: true }); }, 100); } onSuggestionClick (suggestion, e) { e.preventDefault(); this.props.onSuggestionSelected(this.state.tokenStart, this.state.lastToken, suggestion); this.textarea.focus(); } componentWillReceiveProps (nextProps) { if (nextProps.suggestions !== this.props.suggestions && nextProps.suggestions.size > 0 && this.state.suggestionsHidden) { this.setState({ suggestionsHidden: false }); } } setTextarea (c) { this.textarea = c; } onPaste (e) { if (e.clipboardData && e.clipboardData.files.length === 1) { this.props.onPaste(e.clipboardData.files) e.preventDefault(); } } reset () { this.textarea.style.height = 'auto'; } render () { const { value, suggestions, disabled, placeholder, onKeyUp } = this.props; const { suggestionsHidden, selectedSuggestion } = this.state; const style = { direction: 'ltr' }; if (isRtl(value)) { style.direction = 'rtl'; } return ( <div className='autosuggest-textarea'> <textarea ref={this.setTextarea} className='autosuggest-textarea__textarea' disabled={disabled} placeholder={placeholder} autoFocus={true} value={value} onChange={this.onChange} onKeyDown={this.onKeyDown} onKeyUp={onKeyUp} onBlur={this.onBlur} onPaste={this.onPaste} style={style} /> <div style={{ display: (suggestions.size > 0 && !suggestionsHidden) ? 'block' : 'none' }} className='autosuggest-textarea__suggestions'> {suggestions.map((suggestion, i) => ( <div role='button' tabIndex='0' key={suggestion} className={`autosuggest-textarea__suggestions__item ${i === selectedSuggestion ? 'selected' : ''}`} onClick={this.onSuggestionClick.bind(this, suggestion)}> <AutosuggestAccountContainer id={suggestion} /> </div> ))} </div> </div> ); } }; AutosuggestTextarea.propTypes = { value: PropTypes.string, suggestions: ImmutablePropTypes.list, disabled: PropTypes.bool, placeholder: PropTypes.string, onSuggestionSelected: PropTypes.func.isRequired, onSuggestionsClearRequested: PropTypes.func.isRequired, onSuggestionsFetchRequested: PropTypes.func.isRequired, onChange: PropTypes.func.isRequired, onKeyUp: PropTypes.func, onKeyDown: PropTypes.func, onPaste: PropTypes.func.isRequired, }; export default AutosuggestTextarea;