Chapters range selection

app/src/main/java/org/koitharu/kotatsu/details/ui/ChaptersFragment.kt

@@ -135,6 +135,26 @@ class ChaptersFragment :
 				mode.finish()
 				true
 			}
+			R.id.action_select_range -> {
+				val controller = selectionController ?: return false
+				val items = chaptersAdapter?.items ?: return false
+				val ids = HashSet(controller.peekCheckedIds())
+				val buffer = HashSet<Long>()
+				var isAdding = false
+				for (x in items) {
+					if (x.chapter.id in ids) {
+						isAdding = true
+						if (buffer.isNotEmpty()) {
+							ids.addAll(buffer)
+							buffer.clear()
+						}
+					} else if (isAdding) {
+						buffer.add(x.chapter.id)
+					}
+				}
+				controller.addAll(ids)
+				true
+			}
 			R.id.action_select_all -> {
 				val ids = chaptersAdapter?.items?.map { it.chapter.id } ?: return false
 				selectionController?.addAll(ids)
@@ -158,14 +178,24 @@ class ChaptersFragment :
 
 	override fun onPrepareActionMode(mode: ActionMode, menu: Menu): Boolean {
 		val selectedIds = selectionController?.peekCheckedIds() ?: return false
-		val items = chaptersAdapter?.items?.filter { x -> x.chapter.id in selectedIds }.orEmpty()
-		menu.findItem(R.id.action_save).isVisible = items.none { x ->
+		val allItems = chaptersAdapter?.items.orEmpty()
+		val items = allItems.withIndex().filter { (_, x) -> x.chapter.id in selectedIds }
+		menu.findItem(R.id.action_save).isVisible = items.none { (_, x) ->
 			x.chapter.source == MangaSource.LOCAL
 		}
-		menu.findItem(R.id.action_delete).isVisible = items.all { x ->
+		menu.findItem(R.id.action_delete).isVisible = items.all { (_, x) ->
 			x.chapter.source == MangaSource.LOCAL
 		}
+		menu.findItem(R.id.action_select_all).isVisible = items.size < allItems.size
 		mode.title = items.size.toString()
+		var hasGap = false
+		for (i in 0 until items.size - 1) {
+			if (items[i].index + 1 != items[i + 1].index) {
+				hasGap = true
+				break
+			}
+		}
+		menu.findItem(R.id.action_select_range).isVisible = hasGap
 		return true
 	}
 

app/src/main/res/drawable/ic_select_range.xml

@@ -0,0 +1,15 @@
+<vector
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	android:width="24dp"
+	android:height="24dp"
+	android:tint="?attr/colorControlNormal"
+	android:viewportWidth="24"
+	android:viewportHeight="24">
+	<path
+		android:fillColor="#FF000000"
+		android:pathData="M4,3H5V5H3V4A1,1 0,0 1,4 3M20,3A1,1 0,0 1,21 4V5H19V3H20M15,5V3H17V5H15M11,5V3H13V5H11M7,5V3H9V5H7M21,20A1,1 0,0 1,20 21H19V19H21V20M15,21V19H17V21H15M11,21V19H13V21H11M7,21V19H9V21H7M4,21A1,1 0,0 1,3 20V19H5V21H4M3,15H5V17H3V15M21,15V17H19V15H21M3,11H5V13H3V11M21,11V13H19V11H21M3,7H5V9H3V7M21,7V9H19V7H21Z" />
+	<path
+		android:fillColor="#FF000000"
+		android:pathData="M8.687,5.585L8.687,9.514L6.201,9.514L9.514,12.828 12.828,9.514L10.345,9.514L10.345,5.585ZM14.486,11.172 L11.172,14.486h2.483v3.929h1.658v-3.929h2.486z"
+		android:strokeWidth="0.828309" />
+</vector>

app/src/main/res/menu/mode_chapters.xml

@@ -15,6 +15,12 @@
 		android:title="@string/delete"
 		app:showAsAction="ifRoom|withText" />
 
+	<item
+		android:id="@+id/action_select_range"
+		android:icon="@drawable/ic_select_range"
+		android:title="@string/select_range"
+		app:showAsAction="ifRoom|withText" />
+
 	<item
 		android:id="@+id/action_select_all"
 		android:icon="?actionModeSelectAllDrawable"

app/src/main/res/values/strings.xml

@@ -321,4 +321,5 @@
 	<string name="clear_cookies_summary">Can help in case of some issues. All authorizations will be invalidated</string>
 	<string name="show_all">Show all</string>
 	<string name="invalid_domain_message">Invalid domain</string>
+	<string name="select_range">Select range</string>
 </resources>