From 481208f43fda7270a6ac628a412b32120bfc9018 Mon Sep 17 00:00:00 2001
From: Hakim El Hattab <hakim.elhattab@gmail.com>
Date: Wed, 23 Jan 2019 10:30:29 +0100
Subject: [PATCH] hide vertical arrows when navigationMode is 'linear' #2307

---
 css/reveal.css  |  6 ++++++
 css/reveal.scss |  7 +++++++
 js/reveal.js    | 12 ++++++++++--
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/css/reveal.css b/css/reveal.css
index d7442d6..4a9f030 100644
--- a/css/reveal.css
+++ b/css/reveal.css
@@ -343,10 +343,16 @@ body {
   .reveal .controls .enabled.fragmented:hover {
     opacity: 1; }
 
+.reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-up,
+.reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-down {
+  display: none; }
+
+.reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-left,
 .reveal:not(.has-vertical-slides) .controls .navigate-left {
   bottom: 1.4em;
   right: 5.5em; }
 
+.reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-right,
 .reveal:not(.has-vertical-slides) .controls .navigate-right {
   bottom: 1.4em;
   right: 0.5em; }
diff --git a/css/reveal.scss b/css/reveal.scss
index c93276f..c79a562 100644
--- a/css/reveal.scss
+++ b/css/reveal.scss
@@ -407,12 +407,19 @@ $controlsArrowAngleActive: 36deg;
 	}
 }
 
+.reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-up,
+.reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-down {
+	display: none;
+}
+
 // Adjust the layout when there are no vertical slides
+.reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-left,
 .reveal:not(.has-vertical-slides) .controls .navigate-left {
 	bottom: $controlArrowSpacing;
 	right: 0.5em + $controlArrowSpacing + $controlArrowSize;
 }
 
+.reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-right,
 .reveal:not(.has-vertical-slides) .controls .navigate-right {
 	bottom: $controlArrowSpacing;
 	right: 0.5em;
diff --git a/js/reveal.js b/js/reveal.js
index ba69d1a..cee39e2 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -1362,6 +1362,14 @@
 
 		dom.slideNumber.style.display = slideNumberDisplay;
 
+		// Add the navigation mode to the DOM so we can adjust styling
+		if( config.navigationMode !== 'default' ) {
+			dom.wrapper.setAttribute( 'data-navigation-mode', config.navigationMode );
+		}
+		else {
+			dom.wrapper.removeAttribute( 'data-navigation-mode' );
+		}
+
 		sync();
 
 	}
@@ -5316,8 +5324,8 @@
 	/**
 	 * Event handler for navigation control buttons.
 	 */
-	function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); }
-	function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); }
+	function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigatePrev() : navigateLeft(); }
+	function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigateNext() : navigateRight(); }
 	function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
 	function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
 	function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }