move non-Riot-specific components over from riot-web

src/components/views/context_menus/GenericElementContextMenu.js

@@ -0,0 +1,60 @@
+/*
+Copyright 2017 New Vector Ltd
+
+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.
+*/
+
+'use strict';
+
+import React from 'react';
+import PropTypes from 'prop-types';
+
+/*
+ * This component can be used to display generic HTML content in a contextual
+ * menu.
+ */
+
+
+export default class GenericElementContextMenu extends React.Component {
+    static PropTypes = {
+        element: PropTypes.element.isRequired,
+        // Function to be called when the parent window is resized
+        // This can be used to reposition or close the menu on resize and
+        // ensure that it is not displayed in a stale position.
+        onResize: PropTypes.func,
+    };
+
+    constructor(props) {
+        super(props);
+        this.resize = this.resize.bind(this);
+    }
+
+    componentDidMount() {
+        this.resize = this.resize.bind(this);
+        window.addEventListener("resize", this.resize);
+    }
+
+    componentWillUnmount() {
+        window.removeEventListener("resize", this.resize);
+    }
+
+    resize() {
+        if (this.props.onResize) {
+            this.props.onResize();
+        }
+    }
+
+    render() {
+        return <div>{ this.props.element }</div>;
+    }
+}