Implemented large screen mode

Enact-DCO-1.0-Signed-off-by: Hyelyn Kim (myelyn.kim@lge.com)

packages/ui/resolution/ResolutionDecorator.js

@@ -9,7 +9,15 @@ import ReactDOM from 'react-dom';
 import PropTypes from 'prop-types';
 import hoc from '@enact/core/hoc';
 
-import {init, config as riConfig, defineScreenTypes, getResolutionClasses} from './resolution';
+import {
+	init, 
+	calculateFontSize,
+	config as riConfig,
+	defineScreenTypes,
+	getResolutionClasses,
+	updateBaseFontSize,
+	updateScreenScale
+} from './resolution';
 
 /**
  * Default config for `ResolutionDecorator`.
@@ -97,13 +105,29 @@ const ResolutionDecorator = hoc(defaultConfig, (config, Wrapped) => {
 		static displayName = 'ResolutionDecorator';
 
 		static propTypes = /** @lends ui/resolution.ResolutionDecorator.prototype */ {
-			className: PropTypes.string
+			className: PropTypes.string,
+
+			/**
+			 * Screen Scale value for the large screen mode.
+	 		 * Use this value to set the scale of the base font.
+	 		 * This is the value that will be multiplied by pxPerRem, which is determined by the resolution.
+			 *
+			 * @type {Number}
+			 * @default 1
+			 * @public
+			 */
+			screenScale: PropTypes.number
+		};
+
+		static defaultProps = {
+			screenScale: 1
 		};
 
 		constructor (props) {
 			super(props);
 			riConfig.intermediateScreenHandling = config.intermediateScreenHandling;
 			riConfig.matchSmallerScreenType = config.matchSmallerScreenType;
+			updateScreenScale(this.props.screenScale);
 			init({measurementNode: (typeof window !== 'undefined' && window)});
 			this.state = {
 				resolutionClasses: ''
@@ -116,6 +140,10 @@ const ResolutionDecorator = hoc(defaultConfig, (config, Wrapped) => {
 			this.rootNode = ReactDOM.findDOMNode(this);
 		}
 
+		componentDidUpdate (prevProps) {
+			if (prevProps.screenScale !== this.props.screenScale) updateBaseFontSize(calculateFontSize());
+		}
+
 		componentWillUnmount () {
 			if (config.dynamic) window.removeEventListener('resize', this.handleResize);
 		}
@@ -145,11 +173,17 @@ const ResolutionDecorator = hoc(defaultConfig, (config, Wrapped) => {
 		}
 
 		render () {
+			const {...rest} = this.props;
+
+			delete rest.screenScale;
+
+			if (this.props.screenScale) updateScreenScale(this.props.screenScale);
+
 			// Check if the classes are different from our previous classes
 			let classes = getResolutionClasses();
 
 			if (this.props.className) classes += (classes ? ' ' : '') + this.props.className;
-			return <Wrapped {...this.props} className={classes} />;
+			return <Wrapped {...rest} className={classes} />;
 		}
 	};
 });

packages/ui/resolution/resolution.js

@@ -1,6 +1,7 @@
 let baseScreen,
 	orientation,
 	riRatio,
+	screenScale = 1,
 	screenType,
 	workspaceBounds = {
 		width: (typeof window === 'object') ? window.innerWidth : 1920,
@@ -201,11 +202,11 @@ function calculateFontSize (type) {
 	let size;
 
 	if (orientation === 'portrait' && config.orientationHandling === 'scale') {
-		size = scrObj.height / scrObj.width * scrObj.pxPerRem;
+		size = scrObj.height / (scrObj.width * scrObj.pxPerRem * screenScale);
 	} else {
-		size = scrObj.pxPerRem;
+		size = scrObj.pxPerRem * screenScale;
 		if (orientation === 'landscape' && shouldScaleFontSize) {
-			size = parseInt(workspaceBounds.height * scrObj.pxPerRem / scrObj.height);
+			size = parseInt(workspaceBounds.height * scrObj.pxPerRem * screenScale / scrObj.height);
 		}
 	}
 	return size + 'px';
@@ -224,6 +225,17 @@ function updateBaseFontSize (size) {
 	}
 }
 
+/**
+ * @function
+ * @memberof ui/resolution
+ * @param {Number}    screenScaleValue     A value that adjusts the screen scaling.
+ * @returns {undefined}
+ * @private
+ */
+function updateScreenScale (screenScaleValue) {
+	screenScale = screenScaleValue;
+}
+
 /**
  * Returns the CSS classes for the given `type`.
  *
@@ -332,7 +344,7 @@ function getAspectRatioName (type) {
  * @public
  */
 function scale (px) {
-	return (riRatio || getRiRatio()) * px;
+	return (riRatio || getRiRatio()) * px * screenScale;
 }
 
 /**
@@ -366,7 +378,7 @@ function unit (pixels, toUnit) {
 	if (typeof pixels === 'string' && pixels.substr(-2) === 'px') pixels = parseInt(pixels.substr(0, pixels.length - 2));
 	if (typeof pixels !== 'number') return;
 
-	return (pixels / unitToPixelFactors[toUnit]) + '' + toUnit;
+	return (pixels / (screenScale * unitToPixelFactors[toUnit])) + '' + toUnit;
 }
 
 /**
@@ -494,5 +506,7 @@ export {
 	scaleToRem,
 	selectSrc,
 	unit,
-	unitToPixelFactors
+	unitToPixelFactors,
+	updateBaseFontSize,
+	updateScreenScale
 };