Clone ContextualMenu to InteractiveTooltip

As part of reactions and editing work, we're adding a new style of tooltip that
allows interacting with the content of the tooltip.  `ContextualMenu` is closest
out of the things we have today, but it doesn't position in quite the way we
want and it's already quite complex.

To get started, let's first clone that to a new `InteractiveTooltip`.

Part of https://github.com/vector-im/riot-web/issues/9753
Part of https://github.com/vector-im/riot-web/issues/9716

res/css/_components.scss

@@ -86,6 +86,7 @@
 @import "./views/elements/_Field.scss";
 @import "./views/elements/_ImageView.scss";
 @import "./views/elements/_InlineSpinner.scss";
+@import "./views/elements/_InteractiveTooltip.scss";
 @import "./views/elements/_ManageIntegsButton.scss";
 @import "./views/elements/_MemberEventListSummary.scss";
 @import "./views/elements/_MessageEditor.scss";

res/css/views/elements/_InteractiveTooltip.scss

@@ -0,0 +1,164 @@
+/*
+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.
+*/
+
+.mx_InteractiveTooltip_wrapper {
+    position: fixed;
+    z-index: 5000;
+}
+
+.mx_InteractiveTooltip_background {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    opacity: 1.0;
+    z-index: 5000;
+}
+
+.mx_InteractiveTooltip {
+    border-radius: 4px;
+    box-shadow: 4px 4px 12px 0 $menu-box-shadow-color;
+    background-color: $menu-bg-color;
+    color: $primary-fg-color;
+    position: absolute;
+    font-size: 14px;
+    z-index: 5001;
+}
+
+.mx_InteractiveTooltip_right {
+    right: 0;
+}
+
+.mx_InteractiveTooltip.mx_InteractiveTooltip_withChevron_right {
+    right: 8px;
+}
+
+.mx_InteractiveTooltip_chevron_right {
+    position: absolute;
+    right: -8px;
+    top: 0px;
+    width: 0;
+    height: 0;
+    border-top: 8px solid transparent;
+    border-left: 8px solid $menu-bg-color;
+    border-bottom: 8px solid transparent;
+}
+
+.mx_InteractiveTooltip_chevron_right::after {
+    content: '';
+    width: 0;
+    height: 0;
+    border-top: 7px solid transparent;
+    border-left: 7px solid $menu-bg-color;
+    border-bottom: 7px solid transparent;
+    position: absolute;
+    top: -7px;
+    right: 1px;
+}
+
+.mx_InteractiveTooltip_left {
+    left: 0;
+}
+
+.mx_InteractiveTooltip.mx_InteractiveTooltip_withChevron_left {
+    left: 8px;
+}
+
+.mx_InteractiveTooltip_chevron_left {
+    position: absolute;
+    left: -8px;
+    top: 0px;
+    width: 0;
+    height: 0;
+    border-top: 8px solid transparent;
+    border-right: 8px solid $menu-bg-color;
+    border-bottom: 8px solid transparent;
+}
+
+.mx_InteractiveTooltip_chevron_left::after {
+    content: '';
+    width: 0;
+    height: 0;
+    border-top: 7px solid transparent;
+    border-right: 7px solid $menu-bg-color;
+    border-bottom: 7px solid transparent;
+    position: absolute;
+    top: -7px;
+    left: 1px;
+}
+
+.mx_InteractiveTooltip_top {
+    top: 0;
+}
+
+.mx_InteractiveTooltip.mx_InteractiveTooltip_withChevron_top {
+    top: 8px;
+}
+
+.mx_InteractiveTooltip_chevron_top {
+    position: absolute;
+    left: 0px;
+    top: -8px;
+    width: 0;
+    height: 0;
+    border-left: 8px solid transparent;
+    border-bottom: 8px solid $menu-bg-color;
+    border-right: 8px solid transparent;
+}
+
+.mx_InteractiveTooltip_chevron_top::after {
+    content: '';
+    width: 0;
+    height: 0;
+    border-left: 7px solid transparent;
+    border-bottom: 7px solid $menu-bg-color;
+    border-right: 7px solid transparent;
+    position: absolute;
+    left: -7px;
+    top: 1px;
+}
+
+.mx_InteractiveTooltip_bottom {
+    bottom: 0;
+}
+
+.mx_InteractiveTooltip.mx_InteractiveTooltip_withChevron_bottom {
+    bottom: 8px;
+}
+
+.mx_InteractiveTooltip_chevron_bottom {
+    position: absolute;
+    left: 0px;
+    bottom: -8px;
+    width: 0;
+    height: 0;
+    border-left: 8px solid transparent;
+    border-top: 8px solid $menu-bg-color;
+    border-right: 8px solid transparent;
+}
+
+.mx_InteractiveTooltip_chevron_bottom::after {
+    content: '';
+    width: 0;
+    height: 0;
+    border-left: 7px solid transparent;
+    border-top: 7px solid $menu-bg-color;
+    border-right: 7px solid transparent;
+    position: absolute;
+    left: -7px;
+    bottom: 1px;
+}

src/components/views/elements/InteractiveTooltip.js

@@ -0,0 +1,141 @@
+/*
+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 ReactDOM from 'react-dom';
+import PropTypes from 'prop-types';
+import classNames from 'classnames';
+
+const InteractiveTooltipContainerId = "mx_InteractiveTooltip_Container";
+
+function getOrCreateContainer() {
+    let container = document.getElementById(InteractiveTooltipContainerId);
+
+    if (!container) {
+        container = document.createElement("div");
+        container.id = InteractiveTooltipContainerId;
+        document.body.appendChild(container);
+    }
+
+    return container;
+}
+
+export default class InteractiveTooltip extends React.Component {
+    propTypes: {
+        top: PropTypes.number,
+        bottom: PropTypes.number,
+        left: PropTypes.number,
+        right: PropTypes.number,
+        chevronOffset: PropTypes.number,
+        chevronFace: PropTypes.string, // top, bottom, left, right or none
+        // Function to be called on menu close
+        onFinished: PropTypes.func,
+
+        // If true, insert an invisible screen-sized element behind the
+        // menu that when clicked will close it.
+        hasBackground: PropTypes.bool,
+
+        // The component to render as the context menu
+        elementClass: PropTypes.element.isRequired,
+        // on resize callback
+        windowResize: PropTypes.func,
+        // method to close menu
+        closeTooltip: PropTypes.func,
+    };
+
+    render() {
+        const position = {};
+        let chevronFace = null;
+        const props = this.props;
+
+        if (props.top) {
+            position.top = props.top;
+        } else {
+            position.bottom = props.bottom;
+        }
+
+        if (props.left) {
+            position.left = props.left;
+            chevronFace = 'left';
+        } else {
+            position.right = props.right;
+            chevronFace = 'right';
+        }
+
+        const chevronOffset = {};
+        if (props.chevronFace) {
+            chevronFace = props.chevronFace;
+        }
+        const hasChevron = chevronFace && chevronFace !== "none";
+
+        if (chevronFace === 'top' || chevronFace === 'bottom') {
+            chevronOffset.left = props.chevronOffset;
+        } else {
+            chevronOffset.top = props.chevronOffset;
+        }
+
+        const chevron = hasChevron ?
+            <div style={chevronOffset} className={"mx_InteractiveTooltip_chevron_" + chevronFace} /> :
+            undefined;
+        const className = 'mx_InteractiveTooltip_wrapper';
+
+        const menuClasses = classNames({
+            'mx_InteractiveTooltip': true,
+            'mx_InteractiveTooltip_left': !hasChevron && position.left,
+            'mx_InteractiveTooltip_right': !hasChevron && position.right,
+            'mx_InteractiveTooltip_top': !hasChevron && position.top,
+            'mx_InteractiveTooltip_bottom': !hasChevron && position.bottom,
+            'mx_InteractiveTooltip_withChevron_left': chevronFace === 'left',
+            'mx_InteractiveTooltip_withChevron_right': chevronFace === 'right',
+            'mx_InteractiveTooltip_withChevron_top': chevronFace === 'top',
+            'mx_InteractiveTooltip_withChevron_bottom': chevronFace === 'bottom',
+        });
+
+        const ElementClass = props.elementClass;
+
+        return <div className={className} style={{...position}}>
+            <div className={menuClasses}>
+                { chevron }
+                <ElementClass {...props} onFinished={props.closeTooltip} onResize={props.windowResize} />
+            </div>
+            { props.hasBackground && <div className="mx_InteractiveTooltip_background"
+                                          onClick={props.closeTooltip} /> }
+        </div>;
+    }
+}
+
+export function createTooltip(ElementClass, props, hasBackground=true) {
+    const closeTooltip = function(...args) {
+        ReactDOM.unmountComponentAtNode(getOrCreateContainer());
+
+        if (props && props.onFinished) {
+            props.onFinished.apply(null, args);
+        }
+    };
+
+    // We only reference closeTooltip once per call to createTooltip
+    const menu = <InteractiveTooltip
+        hasBackground={hasBackground}
+        {...props}
+        elementClass={ElementClass}
+        closeTooltip={closeTooltip} // eslint-disable-line react/jsx-no-bind
+        windowResize={closeTooltip} // eslint-disable-line react/jsx-no-bind
+    />;
+
+    ReactDOM.render(menu, getOrCreateContainer());
+
+    return {close: closeTooltip};
+}