Merge pull request #3144 from matrix-org/bwindels/edit-history

Edit history dialog

src/components/views/dialogs/MessageEditHistoryDialog.js

@@ -0,0 +1,108 @@
+/*
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+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 MatrixClientPeg from "../../../MatrixClientPeg";
+import { _t } from '../../../languageHandler';
+import sdk from "../../../index";
+import {wantsDateSeparator} from '../../../DateUtils';
+import SettingsStore from '../../../settings/SettingsStore';
+
+export default class MessageEditHistoryDialog extends React.PureComponent {
+    static propTypes = {
+        mxEvent: PropTypes.object.isRequired,
+    };
+
+    constructor(props) {
+        super(props);
+        this.state = {
+            events: [],
+            nextBatch: null,
+            isLoading: true,
+            isTwelveHour: SettingsStore.getValue("showTwelveHourTimestamps"),
+        };
+    }
+
+    loadMoreEdits = async (backwards) => {
+        if (backwards || (!this.state.nextBatch && !this.state.isLoading)) {
+            // bail out on backwards as we only paginate in one direction
+            return false;
+        }
+        const opts = {from: this.state.nextBatch};
+        const roomId = this.props.mxEvent.getRoomId();
+        const eventId = this.props.mxEvent.getId();
+        const result = await MatrixClientPeg.get().relations(
+            roomId, eventId, "m.replace", "m.room.message", opts);
+        let resolve;
+        const promise = new Promise(r => resolve = r);
+        this.setState({
+            events: this.state.events.concat(result.events),
+            nextBatch: result.nextBatch,
+            isLoading: false,
+        }, () => {
+            const hasMoreResults = !!this.state.nextBatch;
+            resolve(hasMoreResults);
+        });
+        return promise;
+    }
+
+    componentDidMount() {
+        this.loadMoreEdits();
+    }
+
+    _renderEdits() {
+        const EditHistoryMessage = sdk.getComponent('messages.EditHistoryMessage');
+        const DateSeparator = sdk.getComponent('messages.DateSeparator');
+        const nodes = [];
+        let lastEvent;
+        this.state.events.forEach(e => {
+            if (!lastEvent || wantsDateSeparator(lastEvent.getDate(), e.getDate())) {
+                nodes.push(<li key={e.getTs() + "~"}><DateSeparator ts={e.getTs()} /></li>);
+            }
+            nodes.push(<EditHistoryMessage key={e.getId()} mxEvent={e} isTwelveHour={this.state.isTwelveHour} />);
+            lastEvent = e;
+        });
+        return nodes;
+    }
+
+    render() {
+        let content;
+        if (this.state.error) {
+            content = this.state.error;
+        } else if (this.state.isLoading) {
+            const Spinner = sdk.getComponent("elements.Spinner");
+            content = <Spinner />;
+        } else {
+            const ScrollPanel = sdk.getComponent("structures.ScrollPanel");
+            content = (<ScrollPanel
+                className="mx_MessageEditHistoryDialog_scrollPanel"
+                onFillRequest={ this.loadMoreEdits }
+                stickyBottom={false}
+                startAtBottom={false}
+            >
+                <ul className="mx_MessageEditHistoryDialog_edits mx_MessagePanel_alwaysShowTimestamps">{this._renderEdits()}</ul>
+            </ScrollPanel>);
+        }
+        const BaseDialog = sdk.getComponent('views.dialogs.BaseDialog');
+        return (
+            <BaseDialog className='mx_MessageEditHistoryDialog' hasCancel={true}
+                        onFinished={this.props.onFinished} title={_t("Message edits")}>
+                {content}
+            </BaseDialog>
+        );
+    }
+}