From a7bec0367961040fce38ba89f1e5bcf9446df462 Mon Sep 17 00:00:00 2001
From: iseulde <ella@iseulde.com>
Date: Wed, 10 May 2017 19:05:09 +0200
Subject: [PATCH] Add Editable placeholders

---
 blocks/editable/index.js   | 30 +++++++++++++++++++++++++++---
 blocks/editable/style.scss | 15 +++++++++++++++
 blocks/editable/tinymce.js | 13 +++++++++++--
 3 files changed, 53 insertions(+), 5 deletions(-)

diff --git a/blocks/editable/index.js b/blocks/editable/index.js
index 0cde867ff9871..443df10c21a99 100644
--- a/blocks/editable/index.js
+++ b/blocks/editable/index.js
@@ -62,7 +62,7 @@ function createElement( type, props, ...children ) {
 }
 
 export default class Editable extends wp.element.Component {
-	constructor() {
+	constructor( props ) {
 		super( ...arguments );
 
 		this.onInit = this.onInit.bind( this );
@@ -73,10 +73,13 @@ export default class Editable extends wp.element.Component {
 		this.onNodeChange = this.onNodeChange.bind( this );
 		this.onKeyDown = this.onKeyDown.bind( this );
 		this.changeFormats = this.changeFormats.bind( this );
+		this.onSelectionChange = this.onSelectionChange.bind( this );
+
 		this.state = {
 			formats: {},
 			alignment: null,
-			bookmark: null
+			bookmark: null,
+			empty: ! props.value || ! props.value.length
 		};
 	}
 
@@ -88,6 +91,7 @@ export default class Editable extends wp.element.Component {
 		editor.on( 'focusin', this.onFocus );
 		editor.on( 'nodechange', this.onNodeChange );
 		editor.on( 'keydown', this.onKeyDown );
+		editor.on( 'selectionChange', this.onSelectionChange );
 	}
 
 	onInit() {
@@ -103,6 +107,23 @@ export default class Editable extends wp.element.Component {
 		this.props.onFocus();
 	}
 
+	isActive() {
+		return document.activeElement === this.editor.getBody();
+	}
+
+	onSelectionChange() {
+		// We must check this because selectionChange is a global event.
+		if ( ! this.isActive() ) {
+			return;
+		}
+
+		const content = this.getContent();
+
+		this.setState( {
+			empty: ! content || ! content.length
+		} );
+	}
+
 	onChange() {
 		if ( ! this.editor.isDirty() ) {
 			return;
@@ -349,7 +370,8 @@ export default class Editable extends wp.element.Component {
 			showAlignments = false,
 			inlineToolbar = false,
 			inline,
-			formattingControls
+			formattingControls,
+			placeholder
 		} = this.props;
 
 		// Generating a key that includes `tagName` ensures that if the tag
@@ -397,6 +419,8 @@ export default class Editable extends wp.element.Component {
 					settings={ {
 						forced_root_block: inline ? false : 'p'
 					} }
+					isEmpty={ this.state.empty }
+					placeholder={ placeholder }
 					key={ key } />
 			</div>
 		);
diff --git a/blocks/editable/style.scss b/blocks/editable/style.scss
index 706d697f6c3e7..42c2583ff5087 100644
--- a/blocks/editable/style.scss
+++ b/blocks/editable/style.scss
@@ -40,6 +40,16 @@
 		background: $light-gray-400;
 	}
 
+	&[data-is-empty="true"] {
+		position: relative;
+	}
+
+	&[data-is-empty="true"]:before {
+		content: attr( data-placeholder );
+		opacity: 0.5;
+		pointer-events: none;
+		position: absolute;
+	}
 }
 
 .block-editable__inline-toolbar {
@@ -57,6 +67,11 @@ figcaption.blocks-editable__tinymce {
 	color: $dark-gray-100;
 	text-align: center;
 	font-size: $default-font-size;
+
+	&:before {
+		left: 50%;
+		transform: translateX( -50% );
+	}
 }
 
 
diff --git a/blocks/editable/tinymce.js b/blocks/editable/tinymce.js
index d718f7a5abbc1..531f215fb6c46 100644
--- a/blocks/editable/tinymce.js
+++ b/blocks/editable/tinymce.js
@@ -11,6 +11,14 @@ export default class TinyMCE extends wp.element.Component {
 		return false;
 	}
 
+	componentWillReceiveProps( nextProps ) {
+		const isEmpty = String( nextProps.isEmpty );
+
+		if ( this.editorNode.getAttribute( 'data-is-empty' ) !== isEmpty ) {
+			this.editorNode.setAttribute( 'data-is-empty', isEmpty );
+		}
+	}
+
 	componentWillUnmount() {
 		if ( ! this.editor ) {
 			return;
@@ -47,7 +55,7 @@ export default class TinyMCE extends wp.element.Component {
 	}
 
 	render() {
-		const { tagName = 'div', style, defaultValue } = this.props;
+		const { tagName = 'div', style, defaultValue, placeholder } = this.props;
 
 		// If a default value is provided, render it into the DOM even before
 		// TinyMCE finishes initializing. This avoids a short delay by allowing
@@ -62,7 +70,8 @@ export default class TinyMCE extends wp.element.Component {
 			contentEditable: true,
 			suppressContentEditableWarning: true,
 			className: 'blocks-editable__tinymce',
-			style
+			style,
+			'data-placeholder': placeholder
 		}, children );
 	}
 }