Merge pull request #29 from readium/fixes/RTL

RTL

r2-shared/src/main/java/org/readium/r2/shared/Metadata.kt

@@ -37,7 +37,7 @@ class Metadata : Serializable {
     var inkers: MutableList<Contributor> = mutableListOf()
     var narrators: MutableList<Contributor> = mutableListOf()
     var imprints: MutableList<Contributor> = mutableListOf()
-    var direction: String = "default"
+    var direction: String = PageProgressionDirection.default.name
     var subjects: MutableList<Subject> = mutableListOf()
     var publishers: MutableList<Contributor> = mutableListOf()
     var contributors: MutableList<Contributor> = mutableListOf()
@@ -84,6 +84,26 @@ class Metadata : Serializable {
         return obj
     }
 
+
+    fun contentLayoutStyle(langType: LangType, pageDirection: String?) : ContentLayoutStyle {
+
+        when(langType) {
+            LangType.afh -> return ContentLayoutStyle.rtl
+            LangType.cjk -> {
+                if (pageDirection == ContentLayoutStyle.rtl.name)
+                    return ContentLayoutStyle.cjkv
+                else
+                    return ContentLayoutStyle.cjkh
+            }
+            else -> {
+                if (pageDirection == ContentLayoutStyle.rtl.name)
+                    return ContentLayoutStyle.rtl
+                else
+                    return ContentLayoutStyle.ltr
+            }
+        }
+    }
+
 }
 
 fun parseMetadata(metadataDict: JSONObject): Metadata {
@@ -243,3 +263,19 @@ fun parseMetadata(metadataDict: JSONObject): Metadata {
 
     return m
 }
+
+enum class LangType {
+    cjk, afh, other
+}
+
+
+enum class PageProgressionDirection {
+    default,
+    ltr,
+    rtl
+}
+
+enum class ContentLayoutStyle {
+    ltr, rtl,
+    cjkv, cjkh
+}