/* Copyright 2015, 2016 OpenMarket Ltd Copyright 2018 New Vector Ltd 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, {CSSProperties, useRef, useState} from "react"; import ReactDOM from "react-dom"; import classNames from "classnames"; import {Key} from "../../Keyboard"; import AccessibleButton, { IAccessibleButtonProps, ButtonEvent } from "../views/elements/AccessibleButton"; import {Writeable} from "../../@types/common"; // Shamelessly ripped off Modal.js. There's probably a better way // of doing reusable widgets like dialog boxes & menus where we go and // pass in a custom control as the actual body. const ContextualMenuContainerId = "mx_ContextualMenu_Container"; function getOrCreateContainer(): HTMLDivElement { let container = document.getElementById(ContextualMenuContainerId) as HTMLDivElement; if (!container) { container = document.createElement("div"); container.id = ContextualMenuContainerId; document.body.appendChild(container); } return container; } const ARIA_MENU_ITEM_ROLES = new Set(["menuitem", "menuitemcheckbox", "menuitemradio"]); interface IPosition { top?: number; bottom?: number; left?: number; right?: number; } export enum ChevronFace { Top = "top", Bottom = "bottom", Left = "left", Right = "right", None = "none", } interface IProps extends IPosition { menuWidth?: number; menuHeight?: number; chevronOffset?: number; chevronFace?: ChevronFace; menuPaddingTop?: number; menuPaddingBottom?: number; menuPaddingLeft?: number; menuPaddingRight?: number; zIndex?: number; // If true, insert an invisible screen-sized element behind the menu that when clicked will close it. hasBackground?: boolean; // whether this context menu should be focus managed. If false it must handle itself managed?: boolean; // Function to be called on menu close onFinished(); // on resize callback windowResize?(); } interface IState { contextMenuElem: HTMLDivElement; } // Generic ContextMenu Portal wrapper // all options inside the menu should be of role=menuitem/menuitemcheckbox/menuitemradiobutton and have tabIndex={-1} // this will allow the ContextMenu to manage its own focus using arrow keys as per the ARIA guidelines. export class ContextMenu extends React.PureComponent { private initialFocus: HTMLElement; static defaultProps = { hasBackground: true, managed: true, }; constructor(props, context) { super(props, context); this.state = { contextMenuElem: null, }; // persist what had focus when we got initialized so we can return it after this.initialFocus = document.activeElement as HTMLElement; } componentWillUnmount() { // return focus to the thing which had it before us this.initialFocus.focus(); } collectContextMenuRect = (element) => { // We don't need to clean up when unmounting, so ignore if (!element) return; let first = element.querySelector('[role^="menuitem"]'); if (!first) { first = element.querySelector('[tab-index]'); } if (first) { first.focus(); } this.setState({ contextMenuElem: element, }); }; onContextMenu = (e) => { if (this.props.onFinished) { this.props.onFinished(); e.preventDefault(); e.stopPropagation(); const x = e.clientX; const y = e.clientY; // XXX: This isn't pretty but the only way to allow opening a different context menu on right click whilst // a context menu and its click-guard are up without completely rewriting how the context menus work. setImmediate(() => { const clickEvent = document.createEvent('MouseEvents'); clickEvent.initMouseEvent( 'contextmenu', true, true, window, 0, 0, 0, x, y, false, false, false, false, 0, null, ); document.elementFromPoint(x, y).dispatchEvent(clickEvent); }); } }; onContextMenuPreventBubbling = (e) => { // stop propagation so that any context menu handlers don't leak out of this context menu // but do not inhibit the default browser menu e.stopPropagation(); }; _onMoveFocus = (element, up) => { let descending = false; // are we currently descending or ascending through the DOM tree? do { const child = up ? element.lastElementChild : element.firstElementChild; const sibling = up ? element.previousElementSibling : element.nextElementSibling; if (descending) { if (child) { element = child; } else if (sibling) { element = sibling; } else { descending = false; element = element.parentElement; } } else { if (sibling) { element = sibling; descending = true; } else { element = element.parentElement; } } if (element) { if (element.classList.contains("mx_ContextualMenu")) { // we hit the top element = up ? element.lastElementChild : element.firstElementChild; descending = true; } } } while (element && !ARIA_MENU_ITEM_ROLES.has(element.getAttribute("role"))); if (element) { element.focus(); } }; _onMoveFocusHomeEnd = (element, up) => { let results = element.querySelectorAll('[role^="menuitem"]'); if (!results) { results = element.querySelectorAll('[tab-index]'); } if (results && results.length) { if (up) { results[0].focus(); } else { results[results.length - 1].focus(); } } }; _onKeyDown = (ev) => { if (!this.props.managed) { if (ev.key === Key.ESCAPE) { this.props.onFinished(); ev.stopPropagation(); ev.preventDefault(); } return; } let handled = true; switch (ev.key) { case Key.TAB: case Key.ESCAPE: this.props.onFinished(); break; case Key.ARROW_UP: this._onMoveFocus(ev.target, true); break; case Key.ARROW_DOWN: this._onMoveFocus(ev.target, false); break; case Key.HOME: this._onMoveFocusHomeEnd(this.state.contextMenuElem, true); break; case Key.END: this._onMoveFocusHomeEnd(this.state.contextMenuElem, false); break; default: handled = false; } if (handled) { // consume all other keys in context menu ev.stopPropagation(); ev.preventDefault(); } }; renderMenu(hasBackground = this.props.hasBackground) { const position: Partial> = {}; const props = this.props; if (props.top) { position.top = props.top; } else { position.bottom = props.bottom; } let chevronFace: IProps["chevronFace"]; if (props.left) { position.left = props.left; chevronFace = ChevronFace.Left; } else { position.right = props.right; chevronFace = ChevronFace.Right; } const contextMenuRect = this.state.contextMenuElem ? this.state.contextMenuElem.getBoundingClientRect() : null; const chevronOffset: CSSProperties = {}; if (props.chevronFace) { chevronFace = props.chevronFace; } const hasChevron = chevronFace && chevronFace !== ChevronFace.None; if (chevronFace === ChevronFace.Top || chevronFace === ChevronFace.Bottom) { chevronOffset.left = props.chevronOffset; } else if (position.top !== undefined) { const target = position.top; // By default, no adjustment is made let adjusted = target; // If we know the dimensions of the context menu, adjust its position // such that it does not leave the (padded) window. if (contextMenuRect) { const padding = 10; adjusted = Math.min(position.top, document.body.clientHeight - contextMenuRect.height + padding); } position.top = adjusted; chevronOffset.top = Math.max(props.chevronOffset, props.chevronOffset + target - adjusted); } let chevron; if (hasChevron) { chevron =
; } const menuClasses = classNames({ 'mx_ContextualMenu': true, 'mx_ContextualMenu_left': !hasChevron && position.left, 'mx_ContextualMenu_right': !hasChevron && position.right, 'mx_ContextualMenu_top': !hasChevron && position.top, 'mx_ContextualMenu_bottom': !hasChevron && position.bottom, 'mx_ContextualMenu_withChevron_left': chevronFace === ChevronFace.Left, 'mx_ContextualMenu_withChevron_right': chevronFace === ChevronFace.Right, 'mx_ContextualMenu_withChevron_top': chevronFace === ChevronFace.Top, 'mx_ContextualMenu_withChevron_bottom': chevronFace === ChevronFace.Bottom, }); const menuStyle: CSSProperties = {}; if (props.menuWidth) { menuStyle.width = props.menuWidth; } if (props.menuHeight) { menuStyle.height = props.menuHeight; } if (!isNaN(Number(props.menuPaddingTop))) { menuStyle["paddingTop"] = props.menuPaddingTop; } if (!isNaN(Number(props.menuPaddingLeft))) { menuStyle["paddingLeft"] = props.menuPaddingLeft; } if (!isNaN(Number(props.menuPaddingBottom))) { menuStyle["paddingBottom"] = props.menuPaddingBottom; } if (!isNaN(Number(props.menuPaddingRight))) { menuStyle["paddingRight"] = props.menuPaddingRight; } const wrapperStyle = {}; if (!isNaN(Number(props.zIndex))) { menuStyle["zIndex"] = props.zIndex + 1; wrapperStyle["zIndex"] = props.zIndex; } let background; if (hasBackground) { background = (
); } return (
{ chevron } { props.children }
{ background }
); } render(): React.ReactChild { return ReactDOM.createPortal(this.renderMenu(), getOrCreateContainer()); } } interface IContextMenuButtonProps extends IAccessibleButtonProps { label?: string; // whether or not the context menu is currently open isExpanded: boolean; } // Semantic component for representing the AccessibleButton which launches a export const ContextMenuButton: React.FC = ({ label, isExpanded, children, onClick, onContextMenu, ...props }) => { return ( { children } ); }; interface IMenuItemProps extends IAccessibleButtonProps { label?: string; className?: string; onClick(ev: ButtonEvent); } // Semantic component for representing a role=menuitem export const MenuItem: React.FC = ({children, label, ...props}) => { return ( { children } ); }; interface IMenuGroupProps extends React.HTMLAttributes { label: string; className?: string; } // Semantic component for representing a role=group for grouping menu radios/checkboxes export const MenuGroup: React.FC = ({children, label, ...props}) => { return
{ children }
; }; interface IMenuItemCheckboxProps extends IAccessibleButtonProps { label?: string; active: boolean; disabled?: boolean; className?: string; onClick(ev: ButtonEvent); } // Semantic component for representing a role=menuitemcheckbox export const MenuItemCheckbox: React.FC = ({children, label, active = false, disabled = false, ...props}) => { return ( { children } ); }; interface IMenuItemRadioProps extends IAccessibleButtonProps { label?: string; active: boolean; disabled?: boolean; className?: string; onClick(ev: ButtonEvent); } // Semantic component for representing a role=menuitemradio export const MenuItemRadio: React.FC = ({children, label, active = false, disabled = false, ...props}) => { return ( { children } ); }; // Placement method for to position context menu to right of elementRect with chevronOffset export const toRightOf = (elementRect: DOMRect, chevronOffset = 12) => { const left = elementRect.right + window.pageXOffset + 3; let top = elementRect.top + (elementRect.height / 2) + window.pageYOffset; top -= chevronOffset + 8; // where 8 is half the height of the chevron return {left, top, chevronOffset}; }; // Placement method for to position context menu right-aligned and flowing to the left of elementRect export const aboveLeftOf = (elementRect: DOMRect, chevronFace = ChevronFace.None) => { const menuOptions: IPosition & { chevronFace: ChevronFace } = { chevronFace }; const buttonRight = elementRect.right + window.pageXOffset; const buttonBottom = elementRect.bottom + window.pageYOffset; const buttonTop = elementRect.top + window.pageYOffset; // Align the right edge of the menu to the right edge of the button menuOptions.right = window.innerWidth - buttonRight; // Align the menu vertically on whichever side of the button has more space available. if (buttonBottom < window.innerHeight / 2) { menuOptions.top = buttonBottom; } else { menuOptions.bottom = window.innerHeight - buttonTop; } return menuOptions; }; export const useContextMenu = () => { const button = useRef(null); const [isOpen, setIsOpen] = useState(false); const open = () => { setIsOpen(true); }; const close = () => { setIsOpen(false); }; return [isOpen, button, open, close, setIsOpen]; }; export default class LegacyContextMenu extends ContextMenu { render() { return this.renderMenu(false); } } // XXX: Deprecated, used only for dynamic Tooltips. Avoid using at all costs. export function createMenu(ElementClass, props) { const onFinished = function(...args) { ReactDOM.unmountComponentAtNode(getOrCreateContainer()); if (props && props.onFinished) { props.onFinished.apply(null, args); } }; const menu = ; ReactDOM.render(menu, getOrCreateContainer()); return {close: onFinished}; }