Implement IRC draggable display name width

src/components/views/elements/IRCTimelineProfileResizer.tsx

@@ -0,0 +1,86 @@
+/*
+Copyright 2020 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 SettingsStore, {SettingLevel} from "../../../settings/SettingsStore";
+import Draggable, {ILocationState} from './Draggable';
+
+interface IProps {
+    // Current room
+    roomId: string,
+    minWidth: number,
+    maxWidth: number,
+};
+
+interface IState {
+    width: number,
+    IRCLayoutRoot: HTMLElement,
+};
+
+export default class IRCTimelineProfileResizer extends React.Component<IProps, IState> {
+    constructor(props: IProps) {
+        super(props);
+
+        this.state = {
+            width: SettingsStore.getValue("ircDisplayNameWidth", this.props.roomId),
+            IRCLayoutRoot: null,
+        }
+    };
+
+    componentDidMount() {
+        this.setState({
+            IRCLayoutRoot: document.querySelector(".mx_IRCLayout") as HTMLElement,
+        }, () => this.updateCSSWidth(this.state.width))
+    }
+
+    private dragFunc = (location: ILocationState, event: React.MouseEvent<Element, MouseEvent>): ILocationState => {
+        const offset = event.clientX - location.currentX;
+        const newWidth = this.state.width + offset;
+
+        console.log({offset})
+        // If we're trying to go smaller than min width, don't.
+        if (this.state.width <= this.props.minWidth && offset <= 0) {
+            return location;
+        }
+
+        if (this.state.width >= this.props.maxWidth && offset >= 0) {
+            return location;
+        }
+
+        this.setState({
+            width: newWidth,
+        });
+
+        this.updateCSSWidth.bind(this)(newWidth);
+
+        return {
+            currentX: event.clientX,
+            currentY: location.currentY,
+        }
+    }
+
+    private updateCSSWidth(newWidth: number) {
+        this.state.IRCLayoutRoot.style.setProperty("--name-width", newWidth + "px");
+    }
+
+    private onMoueUp(event: MouseEvent) {
+        SettingsStore.setValue("ircDisplayNameWidth", this.props.roomId, SettingLevel.ROOM_DEVICE, this.state.width);
+    }
+
+    render() {
+        return <Draggable className="mx_ProfileResizer" dragFunc={this.dragFunc.bind(this)} onMouseUp={this.onMoueUp.bind(this)}/>
+    }
+};