Add RTL support to Controls

Add RTL support to Controls

css/reveal.css

@@ -198,6 +198,28 @@ body {
     -webkit-transform: translateX(-5px);
             transform: translateX(-5px); } }
 
+@-webkit-keyframes bounce-left {
+  0%, 10%, 25%, 40%, 50% {
+    -webkit-transform: translateX(0);
+            transform: translateX(0); }
+  20% {
+    -webkit-transform: translateX(-10px);
+            transform: translateX(-10px); }
+  30% {
+    -webkit-transform: translateX(5px);
+            transform: translateX(5px); } }
+
+@keyframes bounce-left {
+  0%, 10%, 25%, 40%, 50% {
+    -webkit-transform: translateX(0);
+            transform: translateX(0); }
+  20% {
+    -webkit-transform: translateX(-10px);
+            transform: translateX(-10px); }
+  30% {
+    -webkit-transform: translateX(5px);
+            transform: translateX(5px); } }
+
 @-webkit-keyframes bounce-down {
   0%, 10%, 25%, 40%, 50% {
     -webkit-transform: translateY(0);
@@ -291,6 +313,9 @@ body {
     bottom: 3.2em;
     -webkit-transform: translateX(-10px);
             transform: translateX(-10px); }
+    .reveal .controls .navigate-left.highlight {
+      -webkit-animation: bounce-left 2s 50 both ease-out;
+              animation: bounce-left 2s 50 both ease-out; }
   .reveal .controls .navigate-right {
     right: 0;
     bottom: 3.2em;
@@ -322,13 +347,10 @@ body {
     .reveal .controls .navigate-down.highlight {
       -webkit-animation: bounce-down 2s 50 both ease-out;
               animation: bounce-down 2s 50 both ease-out; }
-  .reveal .controls[data-controls-back-arrows="faded"] .navigate-left.enabled,
   .reveal .controls[data-controls-back-arrows="faded"] .navigate-up.enabled {
     opacity: 0.3; }
-    .reveal .controls[data-controls-back-arrows="faded"] .navigate-left.enabled:hover,
     .reveal .controls[data-controls-back-arrows="faded"] .navigate-up.enabled:hover {
       opacity: 1; }
-  .reveal .controls[data-controls-back-arrows="hidden"] .navigate-left.enabled,
   .reveal .controls[data-controls-back-arrows="hidden"] .navigate-up.enabled {
     opacity: 0;
     visibility: hidden; }
@@ -344,6 +366,24 @@ body {
   .reveal .controls .enabled.fragmented:hover {
     opacity: 1; }
 
+.reveal:not(.rtl) .controls[data-controls-back-arrows="faded"] .navigate-left.enabled {
+  opacity: 0.3; }
+  .reveal:not(.rtl) .controls[data-controls-back-arrows="faded"] .navigate-left.enabled:hover {
+    opacity: 1; }
+
+.reveal:not(.rtl) .controls[data-controls-back-arrows="hidden"] .navigate-left.enabled {
+  opacity: 0;
+  visibility: hidden; }
+
+.reveal.rtl .controls[data-controls-back-arrows="faded"] .navigate-right.enabled {
+  opacity: 0.3; }
+  .reveal.rtl .controls[data-controls-back-arrows="faded"] .navigate-right.enabled:hover {
+    opacity: 1; }
+
+.reveal.rtl .controls[data-controls-back-arrows="hidden"] .navigate-right.enabled {
+  opacity: 0;
+  visibility: hidden; }
+
 .reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-up,
 .reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-down {
   display: none; }

css/reveal.scss

@@ -230,6 +230,12 @@ body {
 	30% {transform: translateX(-5px);}
 }
 
+@keyframes bounce-left {
+	0%, 10%, 25%, 40%, 50% {transform: translateX(0);}
+	20% {transform: translateX(-10px);}
+	30% {transform: translateX(5px);}
+}
+
 @keyframes bounce-down {
 	0%, 10%, 25%, 40%, 50% {transform: translateY(0);}
 	20% {transform: translateY(10px);}
@@ -327,6 +333,10 @@ $controlsArrowAngleActive: 36deg;
 		right: $controlArrowSize + $controlArrowSpacing*2;
 		bottom: $controlArrowSpacing + $controlArrowSize/2;
 		transform: translateX( -10px );
+
+		&.highlight {
+			animation: bounce-left 2s 50 both ease-out;
+		}
 	}
 
 	.navigate-right {
@@ -371,7 +381,6 @@ $controlsArrowAngleActive: 36deg;
 	// Back arrow style: "faded":
 	// Deemphasize backwards navigation arrows in favor of drawing
 	// attention to forwards navigation
-	&[data-controls-back-arrows="faded"] .navigate-left.enabled,
 	&[data-controls-back-arrows="faded"] .navigate-up.enabled {
 		opacity: 0.3;
 
@@ -382,7 +391,6 @@ $controlsArrowAngleActive: 36deg;
 
 	// Back arrow style: "hidden":
 	// Never show arrows for backwards navigation
-	&[data-controls-back-arrows="hidden"] .navigate-left.enabled,
 	&[data-controls-back-arrows="hidden"] .navigate-up.enabled {
 		opacity: 0;
 		visibility: hidden;
@@ -408,6 +416,44 @@ $controlsArrowAngleActive: 36deg;
 	}
 }
 
+.reveal:not(.rtl) .controls {
+	// Back arrow style: "faded":
+	// Deemphasize left arrow
+	&[data-controls-back-arrows="faded"] .navigate-left.enabled {
+		opacity: 0.3;
+
+		&:hover {
+			opacity: 1;
+		}
+	}
+
+	// Back arrow style: "hidden":
+	// Never show left arrow
+	&[data-controls-back-arrows="hidden"] .navigate-left.enabled {
+		opacity: 0;
+		visibility: hidden;
+	}
+}
+
+.reveal.rtl .controls {
+	// Back arrow style: "faded":
+	// Deemphasize right arrow in RTL mode
+	&[data-controls-back-arrows="faded"] .navigate-right.enabled  {
+		opacity: 0.3;
+
+		&:hover {
+			opacity: 1;
+		}
+	}
+
+	// Back arrow style: "hidden":
+	// Never show right arrow in RTL mode
+	&[data-controls-back-arrows="hidden"] .navigate-right.enabled {
+		opacity: 0;
+		visibility: hidden;
+	}
+}
+
 .reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-up,
 .reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-down {
 	display: none;

js/reveal.js

@@ -336,6 +336,7 @@
 
 		// Remember which directions that the user has navigated towards
 		hasNavigatedRight = false,
+		hasNavigatedLeft = false,
 		hasNavigatedDown = false,
 
 		// Slides may hold a data-state attribute which we pick up and apply
@@ -760,9 +761,12 @@
 		dom.progressbar = dom.progress.querySelector( 'span' );
 
 		// Arrow controls
+		var leftArrowLabel = config.rtl ? "next slide" : "previous slide";
+		var rightArrowLabel = config.rtl ? "previous slide" : "next slide";
+
 		dom.controls = createSingletonNode( dom.wrapper, 'aside', 'controls',
-			'<button class="navigate-left" aria-label="previous slide"><div class="controls-arrow"></div></button>' +
+			'<button class="navigate-left" aria-label="' + leftArrowLabel + '"><div class="controls-arrow"></div></button>' +
-			'<button class="navigate-right" aria-label="next slide"><div class="controls-arrow"></div></button>' +
+			'<button class="navigate-right" aria-label="' + rightArrowLabel + '"><div class="controls-arrow"></div></button>' +
 			'<button class="navigate-up" aria-label="above slide"><div class="controls-arrow"></div></button>' +
 			'<button class="navigate-down" aria-label="below slide"><div class="controls-arrow"></div></button>' );
 
@@ -787,8 +791,9 @@
 		dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
 		dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
 
-		// The right and down arrows in the standard reveal.js controls
+		// The left, right and down arrows in the standard reveal.js controls
 		dom.controlsRightArrow = dom.controls.querySelector( '.navigate-right' );
+		dom.controlsLeftArrow = dom.controls.querySelector( '.navigate-left' );
 		dom.controlsDownArrow = dom.controls.querySelector( '.navigate-down' );
 
 		dom.statusDiv = createStatusDiv();
@@ -3606,6 +3611,7 @@
 
 		}
 
+
 		if( config.controlsTutorial ) {
 
 			// Highlight control arrows with an animation to ensure
@@ -3616,6 +3622,17 @@
 			else {
 				dom.controlsDownArrow.classList.remove( 'highlight' );
 
+				if (config.rtl) {
+
+					if( !hasNavigatedLeft && routes.left && indexv === 0 ) {
+						dom.controlsLeftArrow.classList.add( 'highlight' );
+					}
+					else {
+						dom.controlsLeftArrow.classList.remove( 'highlight' );
+					}
+
+				} else {
+
 					if( !hasNavigatedRight && routes.right && indexv === 0 ) {
 						dom.controlsRightArrow.classList.add( 'highlight' );
 					}
@@ -3623,9 +3640,8 @@
 						dom.controlsRightArrow.classList.remove( 'highlight' );
 					}
 				}
-
 			}
-
+		}
 	}
 
 	/**
@@ -5210,6 +5226,8 @@
 
 	function navigateLeft() {
 
+		hasNavigatedLeft = true;
+
 		// Reverse for RTL
 		if( config.rtl ) {
 			if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
@@ -5299,7 +5317,12 @@
 	 */
 	function navigateNext() {
 
+		if (!config.rtl) {
 			hasNavigatedRight = true;
+		} else {
+			hasNavigatedLeft = true;
+		}
+
 		hasNavigatedDown = true;
 
 		// Prioritize revealing fragments