add ToastContainer

src/components/structures/ToastContainer.js

@@ -0,0 +1,85 @@
+/*
+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 * as React from "react";
+import dis from "../../dispatcher";
+import { _t } from '../../languageHandler';
+import classNames from "classnames";
+
+export default class ToastContainer extends React.Component {
+    constructor() {
+        super();
+        this.state = {toasts: []};
+    }
+
+    componentDidMount() {
+        this._dispatcherRef = dis.register(this.onAction);
+    }
+
+    componentWillUnmount() {
+        dis.unregister(this._dispatcherRef);
+    }
+
+    onAction = (payload) => {
+        if (payload.action === "show_toast") {
+            this._addToast(payload.toast);
+        }
+    };
+
+    _addToast(toast) {
+        this.setState({toasts: this.state.toasts.concat(toast)});
+    }
+
+    dismissTopToast = () => {
+        const [, ...remaining] = this.state.toasts;
+        this.setState({toasts: remaining});
+    };
+
+    render() {
+        const totalCount = this.state.toasts.length;
+        if (totalCount === 0) {
+            return null;
+        }
+        const isStacked = totalCount > 1;
+        const topToast = this.state.toasts[0];
+        const {title, icon, key, component, props} = topToast;
+
+        const containerClasses = classNames("mx_ToastContainer", {
+            "mx_ToastContainer_stacked": isStacked,
+        });
+
+        const toastClasses = classNames("mx_Toast_toast", {
+            "mx_Toast_hasIcon": icon,
+            [`mx_Toast_icon_${icon}`]: icon,
+        });
+
+        const countIndicator = isStacked ? _t(" (1/%(totalCount)s)", {totalCount}) : null;
+
+        const toastProps = Object.assign({}, props, {
+            dismiss: this.dismissTopToast,
+            key,
+        });
+
+        return (
+            <div className={containerClasses}>
+                <div className={toastClasses}>
+                    <h2>{title}{countIndicator}</h2>
+                    <div className="mx_Toast_body">{React.createElement(component, toastProps)}</div>
+                </div>
+            </div>
+        );
+    }
+}