element-web/src/components/views/messages/ReactionsRowButton.js

/*
Copyright 2019 New Vector Ltd

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import React from 'react';
import PropTypes from 'prop-types';
import classNames from 'classnames';

import MatrixClientPeg from '../../../MatrixClientPeg';
import sdk from '../../../index';

export default class ReactionsRowButton extends React.PureComponent {
    static propTypes = {
        // The event we're displaying reactions for
        mxEvent: PropTypes.object.isRequired,
        // The reaction content / key / emoji
        content: PropTypes.string.isRequired,
        // A Set of Martix reaction events for this key
        reactionEvents: PropTypes.object.isRequired,
        // A possible Matrix event if the current user has voted for this type
        myReactionEvent: PropTypes.object,
    }

    constructor(props) {
        super(props);

        this.state = {
            tooltipVisible: false,
        };
    }

    onClick = (ev) => {
        const { mxEvent, myReactionEvent, content } = this.props;
        if (myReactionEvent) {
            MatrixClientPeg.get().redactEvent(
                mxEvent.getRoomId(),
                myReactionEvent.getId(),
            );
        } else {
            MatrixClientPeg.get().sendEvent(mxEvent.getRoomId(), "m.reaction", {
                "m.relates_to": {
                    "rel_type": "m.annotation",
                    "event_id": mxEvent.getId(),
                    "key": content,
                },
            });
        }
    };

    onMouseOver = () => {
        this.setState({
            // To avoid littering the DOM with a tooltip for every reaction,
            // only render it on first use.
            tooltipRendered: true,
            tooltipVisible: true,
        });
    }

    onMouseOut = () => {
        this.setState({
            tooltipVisible: false,
        });
    }

    render() {
        const ReactionsRowButtonTooltip =
            sdk.getComponent('messages.ReactionsRowButtonTooltip');
        const { content, reactionEvents, myReactionEvent } = this.props;

        const count = reactionEvents.size;
        if (!count) {
            return null;
        }

        const classes = classNames({
            mx_ReactionsRowButton: true,
            mx_ReactionsRowButton_selected: !!myReactionEvent,
        });

        let tooltip;
        if (this.state.tooltipRendered) {
            tooltip = <ReactionsRowButtonTooltip
                mxEvent={this.props.mxEvent}
                content={content}
                reactionEvents={reactionEvents}
                visible={this.state.tooltipVisible}
            />;
        }

        return <span className={classes}
            onClick={this.onClick}
            onMouseOver={this.onMouseOver}
            onMouseOut={this.onMouseOut}
        >
            {content} {count}
            {tooltip}
        </span>;
    }
}