Major RTL fixes

src/contents.js

@@ -578,10 +578,10 @@ class Contents {
 			if(range) {
 				try {
 					if (!range.endContainer ||
-						(range.startContainer == range.endContainer 
+						(range.startContainer == range.endContainer
 						&& range.startOffset == range.endOffset)) {
 						// If the end for the range is not set, it results in collapsed becoming
-						// true. This in turn leads to inconsistent behaviour when calling 
+						// true. This in turn leads to inconsistent behaviour when calling
 						// getBoundingRect. Wrong bounds lead to the wrong page being displayed.
 						// https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/15684911/
 						let pos = range.startContainer.textContent.indexOf(" ", range.startOffset);
@@ -995,7 +995,7 @@ class Contents {
 	 * @param {number} columnWidth
 	 * @param {number} gap
 	 */
-	columns(width, height, columnWidth, gap){
+	columns(width, height, columnWidth, gap, dir){
 		let COLUMN_AXIS = prefixed("column-axis");
 		let COLUMN_GAP = prefixed("column-gap");
 		let COLUMN_WIDTH = prefixed("column-width");
@@ -1006,9 +1006,8 @@ class Contents {
 
 		this.layoutStyle("paginated");
 
-		// Fix body width issues if rtl is only set on body element
-		if (this.content.dir === "rtl") {
-			this.direction("rtl");
+        if (dir === "rtl") {
+		    this.direction(dir);
 		}
 
 		this.width(width);

src/layout.js

@@ -195,7 +195,7 @@ class Layout {
 		if (this.name === "pre-paginated") {
 			formating = contents.fit(this.columnWidth, this.height);
 		} else if (this._flow === "paginated") {
-			formating = contents.columns(this.width, this.height, this.columnWidth, this.gap);
+			formating = contents.columns(this.width, this.height, this.columnWidth, this.gap, this.settings.direction);
 		} else { // scrolled
 			formating = contents.size(this.width, null);
 		}

src/managers/continuous/index.js

@@ -265,20 +265,34 @@ class ContinuousViewManager extends DefaultViewManager {
 			}
 
 		};
+        //Horizontal negative scrooling
+        if (horizontal  && rtl && this.settings.rtlScrollType === "negative") {
 
-		if (offset + visibleLength + delta >= contentLength) {
-			if (horizontal && rtl) {
-				prepend();
-			} else {
-				append();
+			if (offset - delta <= (-1 * contentLength)) {
+					append();
 			}
-		}
 
-		if (offset - delta < 0 ) {
-			if (horizontal && rtl) {
-				append();
-			} else {
-				prepend();
+			if (offset  + delta > 0) {
+					prepend();
+			}
+
+		}
+        //default scrooling
+		else {
+			if (offset + visibleLength + delta >= contentLength) {
+				if (horizontal && rtl) {
+					prepend();
+				} else {
+					append();
+				}
+			}
+
+			if (offset - delta < 0) {
+				if (horizontal && rtl) {
+					append();
+				} else {
+					prepend();
+				}
 			}
 		}
 
@@ -355,7 +369,17 @@ class ContinuousViewManager extends DefaultViewManager {
 			if(this.settings.axis === "vertical") {
 				this.scrollTo(0, prevTop - bounds.height, true);
 			} else {
-				this.scrollTo(prevLeft - Math.floor(bounds.width), 0, true);
+                if(this.settings.direction === 'rtl') {
+					if (this.settings.rtlScrollType === "default") {
+					    this.scrollTo(prevLeft, 0, true);
+					}
+					else {
+						this.scrollTo(prevLeft + Math.floor(bounds.width), 0, true);
+					}
+				}
+				else {
+					this.scrollTo(prevLeft - Math.floor(bounds.width), 0, true);
+				}
 			}
 		}
 

src/managers/default/index.js

@@ -60,6 +60,29 @@ class DefaultViewManager {
 
 		this.settings.size = size;
 
+        //Detect RTL scroll type
+        var definer = document.createElement('div');
+        definer.style.position = "absolute";
+        definer.style.width = "1px";
+        definer.style.height = "1px";
+        definer.style.overflow = "scroll";
+        definer.dir="rtl";
+        definer.appendChild(document.createTextNode('A'));
+
+        document.body.appendChild(definer);
+        var type = 'reverse';
+
+        if (definer.scrollLeft > 0) {
+            type = 'default';
+        } else {
+            definer.scrollLeft = 1;
+            if (definer.scrollLeft === 0) {
+                type = 'negative';
+            }
+        }
+        document.body.removeChild(definer);
+        this.settings.rtlScrollType = type;
+
 		// Save the stage
 		this.stage = new Stage({
 			width: size.width,
@@ -423,13 +446,25 @@ class DefaultViewManager {
 
 			this.scrollLeft = this.container.scrollLeft;
 
-			left = this.container.scrollLeft;
+            if (this.settings.rtlScrollType === "default"){
+					left = this.container.scrollLeft;
 
-			if(left > 0) {
-				this.scrollBy(this.layout.delta, 0, true);
-			} else {
-				next = this.views.last().section.next();
-			}
+					if (left > 0) {
+						this.scrollBy(this.layout.delta, 0, true);
+					} else {
+						next = this.views.last().section.next();
+					}
+				}
+				else{
+					left = this.container.scrollLeft + ( this.layout.delta * -1 );
+					if (left > this.container.scrollWidth * -1){
+						this.scrollBy(this.layout.delta, 0, true);
+					}
+					else{
+						next = this.views.last().section.next();
+
+					}
+				}
 
 		} else if (this.isPaginated && this.settings.axis === "vertical") {
 
@@ -493,13 +528,25 @@ class DefaultViewManager {
 
 			this.scrollLeft = this.container.scrollLeft;
 
-			left = this.container.scrollLeft + this.container.offsetWidth + this.layout.delta;
+            if (this.settings.rtlScrollType === "default"){
+					left = this.container.scrollLeft + this.container.offsetWidth + this.layout.delta;
 
-			if(left <= this.container.scrollWidth) {
-				this.scrollBy(-this.layout.delta, 0, true);
-			} else {
-				prev = this.views.first().section.prev();
-			}
+					if (left <= this.container.scrollWidth) {
+						this.scrollBy(-this.layout.delta, 0, true);
+					} else {
+						prev = this.views.first().section.prev();
+					}
+				}
+				else{
+					left = this.container.scrollLeft;
+
+					if (left < 0) {
+						this.scrollBy(-this.layout.delta, 0, true);
+					} else {
+						prev = this.views.first().section.prev();
+					}
+
+				}
 
 		} else if (this.isPaginated && this.settings.axis === "vertical") {
 
@@ -537,7 +584,12 @@ class DefaultViewManager {
 				.then(function(){
 					if(this.isPaginated && this.settings.axis === "horizontal") {
 						if (this.settings.direction === "rtl") {
-							this.scrollTo(0, 0, true);
+                            if (this.settings.rtlScrollType === "default"){
+								this.scrollTo(0, 0, true);
+							}
+							else{
+								this.scrollTo((this.container.scrollWidth * -1) + this.layout.delta, 0, true);
+							}
 						} else {
 							this.scrollTo(this.container.scrollWidth - this.layout.delta, 0, true);
 						}

src/packaging.js

@@ -59,7 +59,21 @@ class Packaging {
 		this.uniqueIdentifier = this.findUniqueIdentifier(packageDocument);
 		this.metadata = this.parseMetadata(metadataNode);
 
-		this.metadata.direction = spineNode.getAttribute("page-progression-direction");
+        // Detect book direction - default ltr
+        //RTL detection
+        //1. spineNode attributes page-progression-direction
+        //2. Language metadata field check against rtl languages
+        this.metadata.direction = ( function() {
+    		var defaultDirection = "ltr";
+    		var rtlLanguages =
+    		["ar", "arc", "dv", "fa", "ha", "he", "khw", "ku", "ps", "ur", "yi"];
+
+    		var isRTLLanguage = rtlLanguages.indexOf(this.metadata.language.toLowerCase()) > -1;
+
+    		return  spineNode.getAttribute("page-progression-direction") ||
+    				isRTLLanguage ? "rtl" : ""							 ||
+    				defaultDirection;
+			}.bind(this))();
 
 
 		return {