Editor: Add support for editing embeds inside a post

This adds a dialog to edit the embed URL, but doesn't add a preview of the new URL, so it doesn't fully implement [the design in #1729](https://user-images.githubusercontent.com/191598/28643536-23f2e318-7224-11e7-8fd1-9a889d53b594.png). It's a step in that direction, though, and a future PR will add the preview.

See #1729

client/components/tinymce/index.jsx

@@ -42,6 +42,7 @@ import afterTheDeadlinePlugin from './plugins/after-the-deadline/plugin';
 import wptextpatternPlugin from './plugins/wptextpattern/plugin';
 import toolbarPinPlugin from './plugins/toolbar-pin/plugin';
 import insertMenuPlugin from './plugins/insert-menu/plugin';
+import embedPlugin from './plugins/embed/plugin';
 import embedReversalPlugin from './plugins/embed-reversal/plugin';
 import EditorHtmlToolbar from 'post-editor/editor-html-toolbar';
 import mentionsPlugin from './plugins/mentions/plugin';
@@ -69,6 +70,7 @@ import wpEmojiPlugin from './plugins/wpemoji/plugin';
 	afterTheDeadlinePlugin,
 	wptextpatternPlugin,
 	toolbarPinPlugin,
+	embedPlugin,
 	embedReversalPlugin,
 	markdownPlugin,
 	wpEmojiPlugin,
@@ -115,6 +117,7 @@ const EVENTS = {
 
 const PLUGINS = [
 	'colorpicker',
+	'embed',
 	'hr',
 	'lists',
 	'media',

client/components/tinymce/plugins/embed/dialog.jsx

@@ -0,0 +1,109 @@
+/**
+ * External dependencies
+ */
+import PropTypes from 'prop-types';
+import React from 'react';
+import { localize } from 'i18n-calypso';
+
+/**
+ * Internal dependencies
+ */
+import Button from 'components/button';
+import Dialog from 'components/dialog';
+import FormTextInput from 'components/forms/form-text-input';
+
+/*
+ * Shows the URL of am embed and allows it to be edited.
+ */
+export class EmbedDialog extends React.Component {
+	static propTypes = {
+		embedUrl: PropTypes.string,
+		isVisible: PropTypes.bool,
+
+		// Event handlers
+		onCancel: PropTypes.func.isRequired,
+		onUpdate: PropTypes.func.isRequired,
+
+		// Inherited
+		translate: PropTypes.func.isRequired,
+	};
+
+	static defaultProps = {
+		embedUrl: '',
+		isVisible: false,
+	};
+
+	state = {
+		embedUrl: this.props.embedUrl,
+	};
+
+	/**
+	 * Reset `state.embedUrl` whenever the component's dialog is opened or closed.
+	 *
+	 * If this were not done, then switching back and forth between multiple embeds would result in
+	 * `state.embedUrl` being incorrect. For example, when the second embed was opened,
+	 * `state.embedUrl` would equal the value of the first embed, since it initially set the
+	 * state.
+	 *
+	 * @param {object} nextProps The properties that will be received.
+	 */
+	componentWillReceiveProps = ( nextProps ) => {
+		this.setState( {
+			embedUrl: nextProps.embedUrl,
+		} );
+	};
+
+	onChangeEmbedUrl = ( event ) => {
+		this.setState( { embedUrl: event.target.value } );
+	};
+
+	onUpdate = () => {
+		this.props.onUpdate( this.state.embedUrl );
+	};
+
+	onKeyDownEmbedUrl = ( event ) => {
+		if ( 'Enter' !== event.key ) {
+			return;
+		}
+
+		event.preventDefault();
+		this.onUpdate();
+	};
+
+	render() {
+		const { translate } = this.props;
+		const dialogButtons = [
+			<Button onClick={ this.props.onCancel }>
+				{ translate( 'Cancel' ) }
+			</Button>,
+			<Button primary onClick={ this.onUpdate }>
+				{ translate( 'Update' ) }
+			</Button>
+		];
+
+		return (
+			<Dialog
+				autoFocus={ false }
+				buttons={ dialogButtons }
+				additionalClassNames="embed__modal"
+				isVisible={ this.props.isVisible }
+				onCancel={ this.props.onCancel }
+				onClose={ this.props.onCancel }
+			>
+				<h3 className="embed__title">
+					{ translate( 'Embed URL' ) }
+				</h3>
+
+				<FormTextInput
+					autoFocus={ true }
+					className="embed__url"
+					defaultValue={ this.state.embedUrl }
+					onChange={ this.onChangeEmbedUrl }
+					onKeyDown={ this.onKeyDownEmbedUrl }
+				/>
+			</Dialog>
+		);
+	}
+}
+
+export default localize( EmbedDialog );

client/components/tinymce/plugins/embed/docs/example.jsx

@@ -0,0 +1,49 @@
+/**
+ * External dependencies
+ */
+import React, { PureComponent } from 'react';
+import { noop } from 'lodash';
+
+/**
+ * Internal dependencies
+ */
+import Button from 'components/button';
+import Card from 'components/card';
+import EmbedDialog from '../dialog';
+
+export default class EmbedDialogExample extends PureComponent {
+	state = {
+		embedUrl: 'https://www.youtube.com/watch?v=R54QEvTyqO4',
+		showDialog: false,
+	};
+
+	openDialog = () => this.setState( { showDialog: true } );
+
+	onCancel = () => {
+		this.setState( { showDialog: false } );
+	};
+
+	onUpdate = ( newUrl ) => {
+		this.setState( {
+			embedUrl: newUrl,
+			showDialog: false,
+		} );
+	};
+
+	render() {
+		return (
+			<Card>
+				<Button onClick={ this.openDialog }>
+					Open Embed Dialog
+				</Button>
+
+				<EmbedDialog
+					embedUrl={ this.state.embedUrl }
+					isVisible={ this.state.showDialog }
+					onCancel={ this.onCancel }
+					onUpdate={ this.onUpdate }
+				/>
+			</Card>
+		);
+	}
+};

client/components/tinymce/plugins/embed/plugin.js

@@ -0,0 +1,64 @@
+/**
+ * External dependencies
+ */
+import React from 'react';
+import ReactDom from 'react-dom';
+import tinymce from 'tinymce/tinymce';
+
+/**
+ * Internal dependencies
+ */
+import EmbedDialog from './dialog';
+
+/**
+ * Manages an EmbedDialog to allow editing the URL of an embed inside the editor.
+ *
+ * @param {object} editor An instance of TinyMCE
+ */
+const embed = ( editor ) => {
+	let embedDialogContainer;
+
+	/**
+	 * Open or close the EmbedDialog
+	 *
+	 * @param {boolean} visible `true` makes the dialog visible; `false` hides it.
+	 */
+	const render = ( visible = true ) => {
+		const selectedEmbedNode = editor.selection.getNode();
+		const embedDialogProps = {
+			embedUrl: selectedEmbedNode.innerText || selectedEmbedNode.textContent,
+			isVisible: visible,
+			onCancel: () => render( false ),
+			onUpdate: ( newUrl ) => {
+				editor.execCommand( 'mceInsertContent', false, newUrl );
+				render( false );
+			},
+		};
+
+		ReactDom.render( React.createElement( EmbedDialog, embedDialogProps ), embedDialogContainer );
+
+		// Focus on the editor when closing the dialog, so that the user can start typing right away
+		// instead of having to tab back to the editor.
+		if ( ! visible ) {
+			editor.focus();
+		}
+	};
+
+	editor.addCommand( 'embedDialog', () => render() );
+
+	editor.on( 'init', () => {
+		embedDialogContainer = editor.getContainer().appendChild(
+			document.createElement( 'div' )
+		);
+	} );
+
+	editor.on( 'remove', () => {
+		ReactDom.unmountComponentAtNode( embedDialogContainer );
+		embedDialogContainer.parentNode.removeChild( embedDialogContainer );
+		embedDialogContainer = null;
+	} );
+};
+
+export default () => {
+	tinymce.PluginManager.add( 'embed', embed );
+};

client/components/tinymce/plugins/embed/style.scss

@@ -0,0 +1,17 @@
+.dialog.card.embed__modal {
+	width: 80%;
+	max-width: 600px;
+}
+
+.embed__modal .dialog__action-buttons:before {
+	background: none;
+}
+
+.embed__title {
+	color: #4b6476;
+	font-weight: bold;
+}
+
+input[type="text"].embed__url {
+	margin-top: 1em;
+}

client/components/tinymce/plugins/embed/test/dialog.js

@@ -0,0 +1,118 @@
+/**
+ * External dependencies
+ */
+import React from 'react';
+import { assert } from 'chai';
+import { shallow } from 'enzyme';
+import { identity, noop } from 'lodash';
+import { spy } from 'sinon';
+
+/**
+ * Internal dependencies
+ */
+import Dialog from 'components/dialog';
+import FormTextInput from 'components/forms/form-text-input';
+import { EmbedDialog } from '../dialog';
+
+describe( 'EmbedDialog', function() {
+	it( 'should render', function() {
+		const url = 'https://www.youtube.com/watch?v=JkOIhs2mHpc';
+		const wrapper = shallow(
+			<EmbedDialog
+				embedUrl={ url }
+				onCancel={ noop }
+				onUpdate={ noop }
+				translate={ identity }
+			/>
+		);
+
+		assert.isFalse( wrapper.instance().props.isVisible );
+		assert.strictEqual( wrapper.find( '.embed__title' ).length, 1 );
+		assert.strictEqual( wrapper.find( FormTextInput ).length, 1 );
+		assert.strictEqual( wrapper.find( FormTextInput ).get( 0 ).props.defaultValue, url );
+	} );
+
+	it( "should update the input field's value when input changes", function() {
+		const originalUrl = 'https://www.youtube.com/watch?v=ghrL82cc-ss';
+		const newUrl = 'https://videopress.com/v/DNgJlco8';
+		const wrapper = shallow(
+			<EmbedDialog
+				embedUrl={ originalUrl }
+				onCancel={ noop }
+				onUpdate={ noop }
+				translate={ identity }
+			/>
+		);
+		const mockChangeEvent = {
+			target: {
+				value: newUrl,
+				focus: noop,
+			}
+		};
+		let inputField = wrapper.find( FormTextInput ).get( 0 );
+
+		assert.strictEqual( inputField.props.defaultValue, originalUrl );
+		wrapper.find( FormTextInput ).simulate( 'change', mockChangeEvent );
+		inputField = wrapper.find( FormTextInput ).get( 0 );
+		assert.strictEqual( inputField.props.defaultValue, newUrl );
+	} );
+
+	it( 'should return the new url to onUpdate when updating', function() {
+		const originalUrl = 'https://www.youtube.com/watch?v=R54QEvTyqO4';
+		const newUrl = 'https://videopress.com/v/x4IYthy7';
+		const mockChangeEvent = {
+			target: {
+				value: newUrl,
+				focus: noop,
+			}
+		};
+		let currentUrl = originalUrl;
+		const onUpdate = ( url ) => {
+			currentUrl = url;
+		};
+		const wrapper = shallow(
+			<EmbedDialog
+				embedUrl={ originalUrl }
+				onCancel={ noop }
+				onUpdate={ onUpdate }
+				translate={ identity }
+			/>
+		);
+
+		assert.strictEqual( currentUrl, originalUrl );
+		wrapper.find( FormTextInput ).simulate( 'change', mockChangeEvent );
+		wrapper.instance().onUpdate();
+		assert.strictEqual( currentUrl, newUrl );
+	} );
+
+	it( 'should not return the new url to onUpdate when canceling', function() {
+		const originalUrl = 'https://www.youtube.com/watch?v=JkOIhs2mHpc';
+		const newUrl = 'https://videopress.com/v/GtWYbzhZ';
+		const mockChangeEvent = {
+			target: {
+				value: newUrl,
+				focus: noop,
+			}
+		};
+		const noopSpy = spy( noop );
+		let currentUrl = originalUrl;
+		const onUpdate = ( url ) => {
+			currentUrl = url;
+		};
+		const wrapper = shallow(
+			<EmbedDialog
+				embedUrl={ originalUrl }
+				onCancel={ noopSpy }
+				onUpdate={ onUpdate }
+				translate={ identity }
+			/>
+		);
+
+		assert.strictEqual( currentUrl, originalUrl );
+		wrapper.find( FormTextInput ).simulate( 'change', mockChangeEvent );
+		assert.isFalse( noopSpy.called );
+		wrapper.find( Dialog ).simulate( 'cancel' );
+		assert.isTrue( noopSpy.called );
+		assert.strictEqual( currentUrl, originalUrl );
+	} );
+} );