Initial Modal Widget work tweaks MSC2790

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/views/dialogs/ModalWidgetDialog.tsx

@@ -0,0 +1,138 @@
+/*
+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 * as React from 'react';
+import BaseDialog from './BaseDialog';
+import { _t } from '../../../languageHandler';
+import WidgetMessaging from "../../../WidgetMessaging";
+import {ButtonKind, IButton, KnownWidgetActions} from "../../../widgets/WidgetApi";
+import AccessibleButton from "../elements/AccessibleButton";
+
+interface IModalWidget {
+    type: string;
+    url: string;
+    name: string;
+    data: any;
+    waitForIframeLoad?: boolean;
+    buttons?: IButton[];
+}
+
+interface IProps {
+    widgetDefinition: IModalWidget;
+    sourceWidgetId: string;
+    onFinished(success: boolean, data?: any): void;
+}
+
+interface IState {
+    messaging?: WidgetMessaging;
+}
+
+const MAX_BUTTONS = 3;
+
+export default class ModalWidgetDialog extends React.PureComponent<IProps, IState> {
+    private appFrame: React.RefObject<HTMLIFrameElement> = React.createRef();
+
+    state: IState = {};
+
+    private getWidgetId() {
+        return `modal_${this.props.sourceWidgetId}`;
+    }
+
+    public componentDidMount() {
+        // TODO: Don't violate every principle of widget creation
+        const messaging = new WidgetMessaging(
+            this.getWidgetId(),
+            this.props.widgetDefinition.url,
+            this.props.widgetDefinition.url, // TODO templating and such
+            true,
+            this.appFrame.current.contentWindow,
+        );
+        this.setState({messaging});
+    }
+
+    public componentWillUnmount() {
+        this.state.messaging.fromWidget.removeListener(KnownWidgetActions.CloseModalWidget, this.onWidgetClose);
+        this.state.messaging.stop();
+    }
+
+    private onLoad = () => {
+        this.state.messaging.getCapabilities().then(caps => {
+            console.log("Requested capabilities: ", caps);
+            this.state.messaging.sendWidgetConfig(this.props.widgetDefinition.data);
+        });
+        this.state.messaging.fromWidget.addListener(KnownWidgetActions.CloseModalWidget, this.onWidgetClose);
+    };
+
+    private onWidgetClose = (req) => {
+        this.props.onFinished(true, req.data);
+    }
+
+    public render() {
+        // TODO: Don't violate every single security principle
+
+        const widgetUrl = this.props.widgetDefinition.url
+            + `?widgetId=${this.getWidgetId()}&parentUrl=${encodeURIComponent(window.location.href)}`;
+
+        let buttons;
+        if (this.props.widgetDefinition.buttons) {
+            // show first button rightmost for a more natural specification
+            buttons = this.props.widgetDefinition.buttons.slice(0, MAX_BUTTONS).reverse().map(def => {
+                let kind = "secondary";
+                switch (def.kind) {
+                    case ButtonKind.Primary:
+                        kind = "primary";
+                        break;
+                    case ButtonKind.Secondary:
+                        kind = "primary_outline";
+                        break
+                    case ButtonKind.Danger:
+                        kind = "danger";
+                        break;
+                }
+
+                const onClick = () => {
+                    this.state.messaging.sendModalButtonClicked(def.id);
+                };
+
+                return <AccessibleButton key={def.id} kind={kind} onClick={onClick}>
+                    { def.label }
+                </AccessibleButton>;
+            });
+        }
+
+        return <BaseDialog
+            title={this.props.widgetDefinition.name || _t("Modal Widget")}
+            className="mx_ModalWidgetDialog"
+            contentId="mx_Dialog_content"
+            onFinished={this.props.onFinished}
+            hasCancel={false}
+        >
+            <div>
+                <iframe
+                    ref={this.appFrame}
+                    sandbox="allow-forms allow-scripts"
+                    width={700} // TODO
+                    height={450} // TODO
+                    src={widgetUrl}
+                    onLoad={this.onLoad}
+                />
+            </div>
+            <div className="mx_ModalWidgetDialog_buttons" style={{float: "right"}}>
+                { buttons }
+            </div>
+        </BaseDialog>;
+    }
+}