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

/*
Copyright 2018 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.
*/

'use strict';

import MImageBody from './MImageBody';
import sdk from '../../../index';
import TintableSVG from '../elements/TintableSvg';

export default class MStickerBody extends MImageBody {
    displayName: 'MStickerBody'

    constructor(props) {
      super(props);

      this._onMouseEnter = this._onMouseEnter.bind(this);
      this._onMouseLeave = this._onMouseLeave.bind(this);
      this._onImageLoad = this._onImageLoad.bind(this);
    }

    _onMouseEnter() {
        this.setState({showTooltip: true});
    }

    _onMouseLeave() {
        this.setState({showTooltip: false});
    }

    _onImageLoad() {
        this.setState({
            placeholderClasses: 'mx_MStickerBody_placeholder_invisible',
        });
        const hidePlaceholderTimer = setTimeout(() => {
            this.setState({
                placeholderVisible: false,
                imageClasses: 'mx_MStickerBody_image_visible',
            });
        }, 500);
        this.setState({hidePlaceholderTimer});
        if (this.props.onWidgetLoad) {
            this.props.onWidgetLoad();
        }
    }

    _afterComponentDidMount() {
        if (this.refs.image.complete) {
            // Image already loaded
            this.setState({
                placeholderVisible: false,
                placeholderClasses: '.mx_MStickerBody_placeholder_invisible',
                imageClasses: 'mx_MStickerBody_image_visible',
            });
        } else {
            // Image not already loaded
            this.setState({
                placeholderVisible: true,
                placeholderClasses: '',
                imageClasses: '',
            });
        }
    }

    _afterComponentWillUnmount() {
        if (this.state.hidePlaceholderTimer) {
            clearTimeout(this.state.hidePlaceholderTimer);
            this.setState({hidePlaceholderTimer: null});
        }
    }

    _messageContent(contentUrl, thumbUrl, content) {
        let tooltip;
        const tooltipBody = (
            this.props.mxEvent &&
            this.props.mxEvent.getContent() &&
            this.props.mxEvent.getContent().body) ?
            this.props.mxEvent.getContent().body : null;
        if (this.state.showTooltip && tooltipBody) {
            const RoomTooltip = sdk.getComponent('rooms.RoomTooltip');
            tooltip = <RoomTooltip
                className='mx_RoleButton_tooltip'
                label={tooltipBody} />;
        }

        const gutterSize = 0;
        let placeholderSize = 75;
        let placeholderFixupHeight = '100px';
        let placeholderTop = 0;
        let placeholderLeft = 0;

        if (content.info) {
            placeholderTop = Math.floor((content.info.h/2) - (placeholderSize/2)) + 'px';
            placeholderLeft = Math.floor((content.info.w/2) - (placeholderSize/2) + gutterSize) + 'px';
            placeholderFixupHeight = content.info.h + 'px';
        }

        // The pixel size of sticker images is generally larger than their intended display
        // size so they render at native reolution on HiDPI displays. We therefore need to
        // explicity set the size so they render at the intended size.
        // XXX: This will be clobberred when we run fixupHeight(), but we need to do it
        // here otherwise the stickers are momentarily displayed at the pixel size.
        const imageStyle = {
            height: content.info.h,
            // leave the browser the calculate the width automatically
        };

        placeholderSize = placeholderSize + 'px';

        // Body 'ref' required by MImageBody
        return (
            <span className='mx_MStickerBody' ref='body'
                style={{
                    height: placeholderFixupHeight,
                }}>
                <div className={'mx_MStickerBody_image_container'}>
                  { this.state.placeholderVisible &&
                    <div
                        className={'mx_MStickerBody_placeholder ' + this.state.placeholderClasses}
                        style={{
                            top: placeholderTop,
                            left: placeholderLeft,
                        }}
                    >
                        <TintableSVG
                            src={'img/icons-show-stickers.svg'}
                            width={placeholderSize}
                            height={placeholderSize} />
                    </div> }
                    <img
                        className={'mx_MStickerBody_image ' + this.state.imageClasses}
                        src={contentUrl}
                        style={imageStyle}
                        ref='image'
                        alt={content.body}
                        onLoad={this._onImageLoad}
                        onMouseEnter={this._onMouseEnter}
                        onMouseLeave={this._onMouseLeave}
                    />
                    { tooltip }
                </div>
            </span>
        );
    }

    // Empty to prevent default behaviour of MImageBody
    onClick() {
    }
}