Squashed commit of the following:

commit 4ebd12b631
Author: Jason Yao <h11129@gmail.com>
Date:   Mon Aug 2 00:35:58 2021 -0400

    top source and bottom source

app/src/main/java/io/legado/app/data/dao/SearchBookDao.kt

@@ -1,9 +1,6 @@
 package io.legado.app.data.dao
 
-import androidx.room.Dao
-import androidx.room.Insert
-import androidx.room.OnConflictStrategy
-import androidx.room.Query
+import androidx.room.*
 import io.legado.app.data.entities.SearchBook
 
 @Dao
@@ -65,4 +62,9 @@ interface SearchBookDao {
     @Query("delete from searchBooks where time < :time")
     fun clearExpired(time: Long)
 
+    @Update
+    fun update(vararg searchBook: SearchBook)
+
+    @Delete
+    fun delete(vararg searchBook: SearchBook)
 }

app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceAdapter.kt

@@ -88,6 +88,16 @@ class ChangeSourceAdapter(
                 R.id.menu_disable_book_source -> {
                     callBack.disableSource(searchBook)
                 }
+                R.id.menu_top_source -> {
+                    callBack.topSource(searchBook)
+                }
+                R.id.menu_bottom_source -> {
+                    callBack.bottomSource(searchBook)
+                }
+                R.id.menu_delete_book_source -> {
+                    callBack.deleteSource(searchBook)
+                    updateItems(0, itemCount, listOf<Int>())
+                }
             }
             true
         }
@@ -98,5 +108,8 @@ class ChangeSourceAdapter(
         val bookUrl: String?
         fun changeTo(searchBook: SearchBook)
         fun disableSource(searchBook: SearchBook)
+        fun topSource(searchBook: SearchBook)
+        fun bottomSource(searchBook: SearchBook)
+        fun deleteSource(searchBook: SearchBook)
     }
 }

app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceDialog.kt

@@ -198,9 +198,7 @@ class ChangeSourceDialog : BaseDialogFragment(),
     }
 
     override fun changeTo(searchBook: SearchBook) {
-        val book = searchBook.toBook()
-        book.upInfoFromOld(callBack?.oldBook)
-        callBack?.changeTo(book)
+        changeSource(searchBook)
         dismissAllowingStateLoss()
     }
 
@@ -211,6 +209,31 @@ class ChangeSourceDialog : BaseDialogFragment(),
         viewModel.disableSource(searchBook)
     }
 
+    override fun topSource(searchBook: SearchBook) {
+        viewModel.topSource(searchBook)
+    }
+
+    override fun bottomSource(searchBook: SearchBook) {
+        viewModel.bottomSource(searchBook)
+    }
+
+    override fun deleteSource(searchBook: SearchBook) {
+        if (bookUrl == searchBook.bookUrl) {
+            viewModel.firstSourceOrNull(searchBook)?.let {
+                changeSource(it)
+            }
+        }
+        viewModel.del(searchBook)
+    }
+
+    private fun changeSource(searchBook: SearchBook) {
+        val book = searchBook.toBook()
+        book.upInfoFromOld(callBack?.oldBook)
+        callBack?.changeTo(book)
+        searchBook.time = System.currentTimeMillis()
+        viewModel.updateSource(searchBook)
+    }
+
     /**
      * 更新分组菜单
      */

app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceViewModel.kt

@@ -242,4 +242,49 @@ class ChangeSourceViewModel(application: Application) : BaseViewModel(applicatio
         }
     }
 
+    fun topSource(searchBook: SearchBook) {
+        execute {
+            appDb.bookSourceDao.getBookSource(searchBook.origin)?.let { source ->
+                val minOrder = appDb.bookSourceDao.minOrder - 1
+                source.customOrder = minOrder
+                searchBook.originOrder = source.customOrder
+                appDb.bookSourceDao.update(source)
+                updateSource(searchBook)
+            }
+            upAdapter()
+        }
+    }
+
+    fun bottomSource(searchBook: SearchBook) {
+        execute {
+            appDb.bookSourceDao.getBookSource(searchBook.origin)?.let { source ->
+                val maxOrder = appDb.bookSourceDao.maxOrder + 1
+                source.customOrder = maxOrder
+                searchBook.originOrder = source.customOrder
+                appDb.bookSourceDao.update(source)
+                updateSource(searchBook)
+            }
+            upAdapter()
+        }
+    }
+
+    fun updateSource(searchBook: SearchBook) {
+        appDb.searchBookDao.update(searchBook)
+    }
+
+    fun del(searchBook: SearchBook) {
+        execute {
+            appDb.bookSourceDao.getBookSource(searchBook.origin)?.let { source ->
+                appDb.bookSourceDao.delete(source)
+                appDb.searchBookDao.delete(searchBook)
+            }
+        }
+        searchBooks.remove(searchBook)
+        upAdapter()
+    }
+
+    fun firstSourceOrNull(searchBook: SearchBook): SearchBook? {
+        return searchBooks.firstOrNull { it.bookUrl != searchBook.bookUrl }
+    }
+
 }

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

@@ -1,8 +1,20 @@
 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android">
 
+    <item
+        android:id="@+id/menu_top_source"
+        android:title="@string/to_top" />
+
+    <item
+        android:id="@+id/menu_bottom_source"
+        android:title="@string/to_bottom" />
+
     <item
         android:id="@+id/menu_disable_book_source"
         android:title="@string/disable_book_source" />
 
+    <item
+        android:id="@+id/menu_delete_book_source"
+        android:title="@string/delete" />
+
 </menu>