element-web/src/components/views/elements/ImageView.js

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/*
Copyright 2015, 2016 OpenMarket Ltd
Copyright 2019 Michael Telatynski <7t3chguy@gmail.com>
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, { createRef } from 'react';
import PropTypes from 'prop-types';
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import {MatrixClientPeg} from "../../../MatrixClientPeg";
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import { _t } from '../../../languageHandler';
import AccessibleTooltipButton from "./AccessibleTooltipButton";
import Modal from "../../../Modal";
import * as sdk from "../../../index";
import {Key} from "../../../Keyboard";
import FocusLock from "react-focus-lock";
import MemberAvatar from "../avatars/MemberAvatar";
import {ContextMenuTooltipButton} from "../../../accessibility/context_menu/ContextMenuTooltipButton";
import MessageContextMenu from "../context_menus/MessageContextMenu";
import {aboveLeftOf, ContextMenu} from '../../structures/ContextMenu';
import MessageTimestamp from "../messages/MessageTimestamp";
import SettingsStore from "../../../settings/SettingsStore";
export default class ImageView extends React.Component {
static propTypes = {
src: PropTypes.string.isRequired, // the source of the image being displayed
name: PropTypes.string, // the main title ('name') for the image
link: PropTypes.string, // the link (if any) applied to the name of the image
width: PropTypes.number, // width of the image src in pixels
height: PropTypes.number, // height of the image src in pixels
fileSize: PropTypes.number, // size of the image src in bytes
onFinished: PropTypes.func.isRequired, // callback when the lightbox is dismissed
// the event (if any) that the Image is displaying. Used for event-specific stuff like
// redactions, senders, timestamps etc. Other descriptors are taken from the explicit
// properties above, which let us use lightboxes to display images which aren't associated
// with events.
mxEvent: PropTypes.object,
permalinkCreator: PropTypes.object,
};
constructor(props) {
super(props);
this.state = {
rotation: 0,
zoom: 100,
translationX: 0,
translationY: 0,
moving: false,
contextMenuDisplay: false,
};
}
contextMenuButton = createRef();
initX = 0;
initY = 0;
lastX = 0;
lastY = 0;
minZoom = 100;
maxZoom = 300;
componentDidMount() {
/* We have to use addEventListener() because the listener
* needs to be passive in order to work with Chromium */
this.focusLock.addEventListener('wheel', this.onWheel, { passive: false });
}
componentWillUnmount() {
this.focusLock.removeEventListener('wheel', this.onWheel);
}
onKeyDown = (ev) => {
if (ev.key === Key.ESCAPE) {
ev.stopPropagation();
ev.preventDefault();
this.props.onFinished();
}
};
onWheel = (ev) => {
ev.stopPropagation();
ev.preventDefault();
const newZoom =this.state.zoom - ev.deltaY;
if (newZoom <= this.minZoom) {
this.setState({
zoom: this.minZoom,
translationX: 0,
translationY: 0,
});
return;
}
if (newZoom >= this.maxZoom) {
this.setState({zoom: this.maxZoom});
return;
}
this.setState({
zoom: newZoom,
});
}
onRedactClick = () => {
const ConfirmRedactDialog = sdk.getComponent("dialogs.ConfirmRedactDialog");
Modal.createTrackedDialog('Confirm Redact Dialog', 'Image View', ConfirmRedactDialog, {
onFinished: (proceed) => {
if (!proceed) return;
this.props.onFinished();
MatrixClientPeg.get().redactEvent(
this.props.mxEvent.getRoomId(), this.props.mxEvent.getId(),
).catch(function(e) {
const ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
// display error message stating you couldn't delete this.
const code = e.errcode || e.statusCode;
Modal.createTrackedDialog('You cannot delete this image.', '', ErrorDialog, {
title: _t('Error'),
description: _t('You cannot delete this image. (%(code)s)', {code: code}),
});
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});
},
});
};
onRotateCounterClockwiseClick = (ev) => {
const cur = this.state.rotation;
const rotationDegrees = (cur - 90) % 360;
this.setState({ rotation: rotationDegrees });
};
onRotateClockwiseClick = (ev) => {
const cur = this.state.rotation;
const rotationDegrees = (cur + 90) % 360;
this.setState({ rotation: rotationDegrees });
};
onZoomInClick = (ev) => {
if (this.state.zoom >= this.maxZoom) {
this.setState({zoom: this.maxZoom});
return;
}
this.setState({
zoom: this.state.zoom + 10,
});
};
onZoomOutClick = (ev) => {
if (this.state.zoom <= this.minZoom) {
this.setState({
zoom: this.minZoom,
translationX: 0,
translationY: 0,
});
return;
}
this.setState({
zoom: this.state.zoom - 10,
});
}
onDownloadClick = (ev) => {
const a = document.createElement("a");
a.href = this.props.src;
a.download = this.props.name;
a.click();
}
onOpenContextMenu = (ev) => {
this.setState({
contextMenuDisplay: true,
});
}
onCloseContextMenu = () => {
this.setState({
contextMenuDisplay: false,
});
}
onStartMoving = ev => {
ev.stopPropagation();
ev.preventDefault();
this.setState({moving: true});
this.initX = ev.pageX - this.lastX;
this.initY = ev.pageY - this.lastY;
}
onMoving = ev => {
ev.stopPropagation();
ev.preventDefault();
if (!this.state.moving) return false;
this.lastX = ev.pageX - this.initX;
this.lastY = ev.pageY - this.initY;
this.setState({
translationX: this.lastX,
translationY: this.lastY,
});
}
onEndMoving = ev => {
this.setState({moving: false});
}
renderContextMenu() {
let contextMenu = null;
if (this.state.contextMenuDisplay) {
contextMenu = (
<ContextMenu
{...aboveLeftOf(this.contextMenuButton.current.getBoundingClientRect())}
onFinished={this.onCloseContextMenu}
>
<MessageContextMenu
mxEvent={this.props.mxEvent}
permalinkCreator={this.props.permalinkCreator}
onFinished={this.onCloseContextMenu}
/>
</ContextMenu>
);
}
return (
<React.Fragment>
{ contextMenu }
</React.Fragment>
);
}
render() {
const showEventMeta = !!this.props.mxEvent;
const rotationDegrees = this.state.rotation + "deg";
const zoomPercentage = this.state.zoom/100;
const translatePixelsX = this.state.translationX + "px";
const translatePixelsY = this.state.translationY + "px";
/* The order of the values is important!
* First, we translate and only then we rotate, otherwise
* we would apply the translation to an already rotated
* image causing it translate in the wrong direction. */
const style = {
transform: `translateX(${translatePixelsX})
translateY(${translatePixelsY})
scale(${zoomPercentage})
rotate(${rotationDegrees})`,
};
let info;
if (showEventMeta) {
const mxEvent = this.props.mxEvent;
const showTwelveHour = SettingsStore.getValue("showTwelveHourTimestamps");
const senderName = mxEvent.sender ? mxEvent.sender.name : mxEvent.getSender();
const messageTimestamp = (
<MessageTimestamp showTwelveHour={showTwelveHour} ts={mxEvent.getTs()} />
);
const avatar = (
<MemberAvatar
member={mxEvent.sender}
width={32} height={32}
viewUserOnClick={true}
/>
);
info = (
<div className="mx_ImageView_info_wrapper">
{avatar}
<div className="mx_ImageView_info">
{senderName}
{messageTimestamp}
</div>
</div>
);
} else {
// If there is no event - we're viewing an avatar, we set
// an empty div here, since the panel uses space-between
// and we want the same placement of elements
info = (
<div></div>
);
}
return (
<FocusLock
returnFocus={true}
lockProps={{
onKeyDown: this.onKeyDown,
role: "dialog",
}}
className="mx_ImageView"
ref={ref => this.focusLock = ref}
>
<div className="mx_ImageView_content">
<div className="mx_ImageView_panel">
{info}
<div className="mx_ImageView_toolbar">
<div className="mx_ImageView_toolbar_buttons">
<AccessibleTooltipButton
className="mx_ImageView_button mx_ImageView_button_rotateCW"
title={_t("Rotate Right")}
onClick={this.onRotateClockwiseClick}>
</AccessibleTooltipButton>
<AccessibleTooltipButton
className="mx_ImageView_button mx_ImageView_button_rotateCCW"
title={_t("Rotate Left")}
onClick={ this.onRotateCounterClockwiseClick }>
</AccessibleTooltipButton>
<AccessibleTooltipButton
className="mx_ImageView_button mx_ImageView_button_zoomOut"
title={_t("Zoom out")}
onClick={ this.onZoomOutClick }>
</AccessibleTooltipButton>
<AccessibleTooltipButton
className="mx_ImageView_button mx_ImageView_button_zoomIn"
title={_t("Zoom in")}
onClick={ this.onZoomInClick }>
</AccessibleTooltipButton>
<AccessibleTooltipButton
className="mx_ImageView_button mx_ImageView_button_download"
title={_t("Download")}
onClick={ this.onDownloadClick }>
</AccessibleTooltipButton>
<ContextMenuTooltipButton
className="mx_ImageView_button mx_ImageView_button_more"
title={_t("Options")}
onClick={this.onOpenContextMenu}
inputRef={this.contextMenuButton}
/>
<AccessibleTooltipButton
className="mx_ImageView_button mx_ImageView_button_close"
title={_t("Close")}
onClick={ this.props.onFinished }>
</AccessibleTooltipButton>
{this.renderContextMenu()}
</div>
</div>
</div>
<div className="mx_ImageView_image_wrapper">
<img
src={this.props.src}
title={this.props.name}
style={style}
className="mx_ImageView_image"
draggable={true}
onMouseDown={this.onStartMoving}
onMouseMove={this.onMoving}
onMouseUp={this.onEndMoving}
onMouseLeave={this.onEndMoving}
/>
</div>
</div>
</FocusLock>
);
}
}