feat: 更详细的横竖屏单双页设置

app/src/main/java/io/legado/app/help/config/AppConfig.kt

@@ -312,8 +312,8 @@ object AppConfig : SharedPreferences.OnSharedPreferenceChangeListener {
 
     val loadCoverOnlyWifi = appCtx.getPrefBoolean(PreferKey.loadCoverOnlyWifi, false)
 
-    val doublePageHorizontal: Boolean
-        get() = appCtx.getPrefBoolean(PreferKey.doublePageHorizontal, true)
+    val doublePageHorizontal: String?
+        get() = appCtx.getPrefString(PreferKey.doublePageHorizontal)
 
     var searchGroup: String
         get() = appCtx.getPrefString("searchGroup") ?: ""

app/src/main/java/io/legado/app/ui/book/read/page/provider/ChapterProvider.kt

@@ -612,9 +612,15 @@ object ChapterProvider {
      * 更新绘制尺寸
      */
     fun upLayout() {
-        doublePage = (viewWidth > viewHeight || appCtx.isPad)
-                && ReadBook.pageAnim() != 3
-                && AppConfig.doublePageHorizontal
+        when(AppConfig.doublePageHorizontal){
+            "0" -> doublePage = false
+            "1" -> doublePage = true
+            "2" -> {
+                doublePage = (viewWidth > viewHeight)
+                    && ReadBook.pageAnim() != 3
+            }
+        }
+
         if (viewWidth > 0 && viewHeight > 0) {
             paddingLeft = ReadBookConfig.paddingLeft.dpToPx()
             paddingTop = ReadBookConfig.paddingTop.dpToPx()