书架整理增加滑动选择

app/src/main/assets/updateLog.md

@@ -5,6 +5,7 @@
 
 **2020/10/13**
 * 更新android studio 到 4.1
+* 书架整理增加滑动选择
 
 **2020/10/12**
 * 优化预下载,防止同时下载太多卡顿

app/src/main/java/io/legado/app/ui/book/arrange/ArrangeBookActivity.kt

@@ -21,6 +21,7 @@ import io.legado.app.lib.theme.ATH
 import io.legado.app.ui.book.group.GroupManageDialog
 import io.legado.app.ui.book.group.GroupSelectDialog
 import io.legado.app.ui.widget.SelectActionBar
+import io.legado.app.ui.widget.recycler.DragSelectTouchHelper
 import io.legado.app.ui.widget.recycler.ItemTouchCallback
 import io.legado.app.ui.widget.recycler.VerticalDivider
 import io.legado.app.utils.applyTint
@@ -71,6 +72,12 @@ class ArrangeBookActivity : VMBaseActivity<ArrangeBookViewModel>(R.layout.activi
         val itemTouchCallback = ItemTouchCallback()
         itemTouchCallback.onItemTouchCallbackListener = adapter
         itemTouchCallback.isCanDrag = getPrefInt(PreferKey.bookshelfSort) == 3
+        val dragSelectTouchHelper: DragSelectTouchHelper =
+            DragSelectTouchHelper(adapter.initDragSelectTouchHelperCallback()).setSlideArea(16, 50)
+        dragSelectTouchHelper.attachToRecyclerView(recycler_view)
+        // When this page is opened, it is in selection mode
+        dragSelectTouchHelper.activeSlideSelect()
+        // Note: need judge selection first, so add ItemTouchHelper after it.
         ItemTouchHelper(itemTouchCallback).attachToRecyclerView(recycler_view)
         select_action_bar.setMainActionText(R.string.move_to_group)
         select_action_bar.inflateMenu(R.menu.arrange_book_sel)

app/src/main/java/io/legado/app/ui/book/arrange/ArrangeBookAdapter.kt

@@ -2,6 +2,7 @@ package io.legado.app.ui.book.arrange
 
 import android.content.Context
 import android.view.View
+import androidx.core.os.bundleOf
 import androidx.recyclerview.widget.RecyclerView
 import io.legado.app.R
 import io.legado.app.base.adapter.ItemViewHolder
@@ -9,6 +10,7 @@ import io.legado.app.base.adapter.SimpleRecyclerAdapter
 import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.BookGroup
 import io.legado.app.lib.theme.backgroundColor
+import io.legado.app.ui.widget.recycler.DragSelectTouchHelper
 import io.legado.app.ui.widget.recycler.ItemTouchCallback
 import kotlinx.android.synthetic.main.item_arrange_book.view.*
 import org.jetbrains.anko.backgroundColor
@@ -154,6 +156,32 @@ class ArrangeBookAdapter(context: Context, val callBack: CallBack) :
         isMoved = false
     }
 
+    fun initDragSelectTouchHelperCallback(): DragSelectTouchHelper.Callback {
+        return object : DragSelectTouchHelper.AdvanceCallback<Book>(Mode.ToggleAndReverse) {
+            override fun currentSelectedId(): MutableSet<Book> {
+                return selectedBooks
+            }
+
+            override fun getItemId(position: Int): Book {
+                return getItem(position)!!
+            }
+
+            override fun updateSelectState(position: Int, isSelected: Boolean): Boolean {
+                getItem(position)?.let {
+                    if (isSelected) {
+                        selectedBooks.add(it)
+                    } else {
+                        selectedBooks.remove(it)
+                    }
+                    notifyItemChanged(position, bundleOf(Pair("selected", null)))
+                    callBack.upSelectCount()
+                    return true
+                }
+                return false
+            }
+        }
+    }
+
     interface CallBack {
         val groupList: List<BookGroup>
         fun upSelectCount()

app/src/main/java/io/legado/app/ui/book/source/manage/BookSourceActivity.kt

@@ -174,7 +174,6 @@ class BookSourceActivity : VMBaseActivity<BookSourceViewModel>(R.layout.activity
         dragSelectTouchHelper.attachToRecyclerView(recycler_view)
         // When this page is opened, it is in selection mode
         dragSelectTouchHelper.activeSlideSelect()
-
         // Note: need judge selection first, so add ItemTouchHelper after it.
         ItemTouchHelper(itemTouchCallback).attachToRecyclerView(recycler_view)
     }