Try using snackbar notices instead of prominent ones for saving/failure notices

assets/stylesheets/_z-index.scss

@@ -76,6 +76,10 @@ $z-layers: (
 	// .edit-post-header { z-index: 30 }
 	".components-notice-list": 29,
 
+
+	// Show snackbars above everything (similar to popovers)
+	".components-snackbar-list": 100000,
+
 	// Show modal under the wp-admin menus and the popover
 	".components-modal__screen-overlay": 100000,
 

docs/manifest-devhub.json

@@ -857,6 +857,12 @@
 		"markdown_source": "../packages/components/src/slot-fill/README.md",
 		"parent": "components"
 	},
+	{
+		"title": "Snackbar",
+		"slug": "snackbar",
+		"markdown_source": "../packages/components/src/snackbar/README.md",
+		"parent": "components"
+	},
 	{
 		"title": "Spinner",
 		"slug": "spinner",

docs/manifest.json

@@ -881,6 +881,12 @@
 		"markdown_source": "https://raw.githubusercontent.com/WordPress/gutenberg/master/packages/components/src/slot-fill/README.md",
 		"parent": "components"
 	},
+	{
+		"title": "Snackbar",
+		"slug": "snackbar",
+		"markdown_source": "https://raw.githubusercontent.com/WordPress/gutenberg/master/packages/components/src/snackbar/README.md",
+		"parent": "components"
+	},
 	{
 		"title": "Spinner",
 		"slug": "spinner",

packages/components/CHANGELOG.md

@@ -3,6 +3,7 @@
 ### New Features
 
 - Added a new `HorizontalRule` component.
+- Added a new `Snackbar` component.
 
 ### Bug Fixes
 

packages/components/src/index.js

@@ -50,6 +50,8 @@ export { default as ResizableBox } from './resizable-box';
 export { default as ResponsiveWrapper } from './responsive-wrapper';
 export { default as SandBox } from './sandbox';
 export { default as SelectControl } from './select-control';
+export { default as Snackbar } from './snackbar';
+export { default as SnackbarList } from './snackbar/list';
 export { default as Spinner } from './spinner';
 export { default as ServerSideRender } from './server-side-render';
 export { default as TabPanel } from './tab-panel';

packages/components/src/snackbar/README.md

@@ -0,0 +1,48 @@
+# Snackbar
+
+Use Snackbars to communicate low priority, non-interruptive messages to the user.
+
+## Table of contents
+
+1. [Design guidelines](#design-guidelines)
+2. [Development guidelines](#development-guidelines)
+3. [Related components](#related-components)
+
+## Design guidelines
+
+A Snackbar displays a succinct message that is cleared out after a small delay. It can also offer the user options, like viewing a published post but these options should also be available elsewhere in the UI.
+
+## Development guidelines
+
+### Usage
+
+To display a plain snackbar, pass the message as a `children` prop:
+
+```jsx
+const MySnackbarNotice = () => (
+	<Snackbar>
+		Post published successfully.
+	</Snackbar>
+);
+```
+
+For more complex markup, you can pass any JSX element:
+
+```jsx
+const MySnackbarNotice = () => (
+	<Snackbar>
+		<p>An error occurred: <code>{ errorDetails }</code>.</p>
+	</Snackbar>
+);
+```
+
+#### Props
+
+The following props are used to control the display of the component.
+
+* `onRemove`: function called when dismissing the notice.
+* `actions`: (array) an array of action objects. Each member object should contain a `label` and either a `url` link string or `onClick` callback function. A `className` property can be used to add custom classes to the button styles.
+
+## Related components
+
+- To create a prominent message that requires a higher-level of attention, use a Notice.

packages/components/src/snackbar/index.js

@@ -0,0 +1,80 @@
+/**
+ * External dependencies
+ */
+import { flow, noop } from 'lodash';
+import classnames from 'classnames';
+
+/**
+ * WordPress dependencies
+ */
+import { useEffect } from '@wordpress/element';
+
+/**
+ * Internal dependencies
+ */
+import { Button } from '../';
+
+const stopPropagation = ( event ) => event.stopPropagation();
+const NOTICE_TIMEOUT = 10000;
+
+function Snackbar( {
+	className,
+	children,
+	actions = [],
+	onRemove = noop,
+} ) {
+	useEffect( () => {
+		// This rule doesn't account yet for React Hooks
+		// eslint-disable-next-line @wordpress/react-no-unsafe-timeout
+		const timeoutHandle = setTimeout( () => {
+			onRemove();
+		}, NOTICE_TIMEOUT );
+
+		return () => clearTimeout( timeoutHandle );
+	}, [] );
+
+	const classes = classnames( className, 'components-snackbar' );
+
+	return (
+		<div
+			className={ classes }
+			onClick={ onRemove }
+			tabIndex="0"
+			role="button"
+			onKeyPress={ onRemove }
+		>
+			<div className="components-snackbar__content">
+				{ children }
+				{ actions.map(
+					(
+						{
+							className: buttonCustomClasses,
+							label,
+							onClick,
+							url,
+						},
+						index
+					) => {
+						return (
+							<Button
+								key={ index }
+								href={ url }
+								isTertiary
+								onClick={ url ? stopPropagation : flow( stopPropagation, onClick ) }
+								className={ classnames(
+									'components-snackbar__action',
+									buttonCustomClasses
+								) }
+							>
+								{ label }
+							</Button>
+						);
+					}
+
+				) }
+			</div>
+		</div>
+	);
+}
+
+export default Snackbar;

packages/components/src/snackbar/list.js

@@ -0,0 +1,42 @@
+/**
+ * External dependencies
+ */
+import classnames from 'classnames';
+import { omit, noop } from 'lodash';
+
+/**
+ * Internal dependencies
+ */
+import Snackbar from './';
+
+/**
+* Renders a list of notices.
+*
+* @param  {Object}   $0           Props passed to the component.
+* @param  {Array}    $0.notices   Array of notices to render.
+* @param  {Function} $0.onRemove  Function called when a notice should be removed / dismissed.
+* @param  {Object}   $0.className Name of the class used by the component.
+* @param  {Object}   $0.children  Array of children to be rendered inside the notice list.
+* @return {Object}                The rendered notices list.
+*/
+function SnackbarList( { notices, className, children, onRemove = noop } ) {
+	className = classnames( 'components-snackbar-list', className );
+	const removeNotice = ( id ) => () => onRemove( id );
+
+	return (
+		<div className={ className }>
+			{ children }
+			{ [ ...notices ].reverse().map( ( notice ) => (
+				<Snackbar
+					{ ...omit( notice, [ 'content' ] ) }
+					key={ notice.id }
+					onRemove={ removeNotice( notice.id ) }
+				>
+					{ notice.content }
+				</Snackbar>
+			) ) }
+		</div>
+	);
+}
+
+export default SnackbarList;

packages/components/src/snackbar/style.scss

@@ -0,0 +1,50 @@
+.components-snackbar {
+	font-family: $default-font;
+	font-size: $default-font-size;
+	background-color: $dark-gray-700;
+	border-radius: $radius-round-rectangle;
+	box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
+	color: $white;
+	padding: 10px;
+	min-width: 200px;
+	max-width: 400px;
+
+	&:hover {
+		background-color: $dark-gray-900;
+	}
+
+	&:focus {
+		background-color: $dark-gray-900;
+		box-shadow:
+			0 0 0 1px $white,
+			0 0 0 3px $blue-medium-focus;
+	}
+}
+
+.components-snackbar__action.components-button {
+	margin-left: 20px;
+	color: $white;
+
+	&:not(:disabled):not([aria-disabled="true"]):not(.is-default) {
+		text-decoration: underline;
+
+		&:hover {
+			color: $white;
+			text-decoration: none;
+		}
+	}
+}
+
+.components-snackbar__content {
+	display: flex;
+	align-items: center;
+}
+
+.components-snackbar-list {
+	position: absolute;
+	z-index: z-index(".components-snackbar-list");
+
+	.components-snackbar {
+		margin-top: 10px;
+	}
+}

packages/components/src/style.scss

@@ -35,6 +35,7 @@
 @import "./sandbox/style.scss";
 @import "./scroll-lock/style.scss";
 @import "./select-control/style.scss";
+@import "./snackbar/style.scss";
 @import "./spinner/style.scss";
 @import "./text-control/style.scss";
 @import "./textarea-control/style.scss";

packages/e2e-test-utils/src/publish-post-with-pre-publish-checks-disabled.js

@@ -6,5 +6,5 @@
  */
 export async function publishPostWithPrePublishChecksDisabled() {
 	await page.click( '.editor-post-publish-button' );
-	return page.waitForSelector( '.components-notice.is-success' );
+	return page.waitForSelector( '.components-snackbar' );
 }

packages/e2e-test-utils/src/publish-post.js

@@ -16,5 +16,5 @@ export async function publishPost() {
 	await page.click( '.editor-post-publish-button' );
 
 	// A success notice should show up
-	return page.waitForSelector( '.components-notice.is-success' );
+	return page.waitForSelector( '.components-snackbar' );
 }

packages/e2e-tests/specs/reusable-blocks.test.js

@@ -42,7 +42,7 @@ describe( 'Reusable Blocks', () => {
 
 		// Wait for creation to finish
 		await page.waitForXPath(
-			'//*[contains(@class, "components-notice") and contains(@class, "is-success")]/*[text()="Block created."]'
+			'//*[contains(@class, "components-snackbar")]/*[text()="Block created."]'
 		);
 
 		// Select all of the text in the title field by triple-clicking on it. We
@@ -84,7 +84,7 @@ describe( 'Reusable Blocks', () => {
 
 		// Wait for creation to finish
 		await page.waitForXPath(
-			'//*[contains(@class, "components-notice") and contains(@class, "is-success")]/*[text()="Block created."]'
+			'//*[contains(@class, "components-snackbar")]/*[text()="Block created."]'
 		);
 
 		// Save the reusable block
@@ -184,7 +184,7 @@ describe( 'Reusable Blocks', () => {
 
 		// Wait for deletion to finish
 		await page.waitForXPath(
-			'//*[contains(@class, "components-notice") and contains(@class, "is-success")]/*[text()="Block deleted."]'
+			'//*[contains(@class, "components-snackbar")]/*[text()="Block deleted."]'
 		);
 
 		// Check that we have an empty post again
@@ -221,7 +221,7 @@ describe( 'Reusable Blocks', () => {
 
 		// Wait for creation to finish
 		await page.waitForXPath(
-			'//*[contains(@class, "components-notice") and contains(@class, "is-success")]/*[text()="Block created."]'
+			'//*[contains(@class, "components-snackbar")]/*[text()="Block created."]'
 		);
 
 		// Select all of the text in the title field by triple-clicking on it. We

packages/edit-post/src/components/layout/index.js

@@ -84,8 +84,7 @@ function Layout( {
 				aria-label={ __( 'Editor content' ) }
 				tabIndex="-1"
 			>
-				<EditorNotices dismissible={ false } className="is-pinned" />
-				<EditorNotices dismissible={ true } />
+				<EditorNotices />
 				<PreserveScrollInReorder />
 				<EditorModeKeyboardShortcuts />
 				<KeyboardShortcutHelpModal />

packages/edit-post/src/components/layout/style.scss

@@ -6,34 +6,6 @@
 .edit-post-layout {
 	position: relative;
 
-	.components-notice-list {
-		position: sticky;
-		top: $header-height;
-		right: 0;
-		color: $dark-gray-900;
-
-		@include break-small {
-			top: 0;
-		}
-
-		// Non-dismissible notices.
-		&.is-pinned {
-			position: relative;
-			left: 0;
-			top: 0;
-		}
-	}
-
-	.components-notice {
-		margin: 0 0 5px;
-		padding: 6px 12px;
-		min-height: $panel-header-height;
-
-		.components-notice__dismiss {
-			margin: 10px 5px;
-		}
-	}
-
 	// Beyond the mobile breakpoint, the editor bar is fixed, so make room for it eabove the layout content.
 	@include break-small {
 		padding-top: $header-height;
@@ -54,6 +26,13 @@
 	}
 }
 
+// Adjust the position of the notices
+@include editor-left(".edit-post-layout__content .components-editor-notices__snackbar");
+.edit-post-layout__content .components-editor-notices__snackbar {
+	position: fixed;
+	padding-left: 20px;
+}
+
 .edit-post-layout__content {
 	display: flex;
 	flex-direction: column;