add: scroll lyrics change position and can select text

app/src/main/java/com/ztftrue/music/utils/TextActionModeCallback.kt

@@ -0,0 +1,103 @@
+package com.ztftrue.music.utils;
+
+import android.view.ActionMode
+import android.view.Menu
+import android.view.MenuItem
+import androidx.annotation.VisibleForTesting
+import androidx.compose.ui.geometry.Rect
+
+internal class TextActionModeCallback(
+    val onActionModeDestroy: (() -> Unit)? = null,
+    var rect: Rect = Rect.Zero,
+    var onCopyRequested: (() -> Unit)? = null,
+    var onPasteRequested: (() -> Unit)? = null,
+    var onCutRequested: (() -> Unit)? = null,
+    var onSelectAllRequested: (() -> Unit)? = null
+) {
+    fun onCreateActionMode(mode: ActionMode?, menu: Menu?): Boolean {
+        requireNotNull(menu)
+        requireNotNull(mode)
+
+        onCopyRequested?.let {
+            addMenuItem(menu, MenuItemOption.Copy)
+        }
+        onPasteRequested?.let {
+            addMenuItem(menu, MenuItemOption.Paste)
+        }
+        onCutRequested?.let {
+            addMenuItem(menu, MenuItemOption.Cut)
+        }
+        onSelectAllRequested?.let {
+            addMenuItem(menu, MenuItemOption.SelectAll)
+        }
+        return true
+    }
+
+    // this method is called to populate new menu items when the actionMode was invalidated
+    fun onPrepareActionMode(mode: ActionMode?, menu: Menu?): Boolean {
+        if (mode == null || menu == null) return false
+        updateMenuItems(menu)
+        // should return true so that new menu items are populated
+        return true
+    }
+
+    fun onActionItemClicked(mode: ActionMode?, item: MenuItem?): Boolean {
+        when (item!!.itemId) {
+            MenuItemOption.Copy.id -> onCopyRequested?.invoke()
+            MenuItemOption.Paste.id -> onPasteRequested?.invoke()
+            MenuItemOption.Cut.id -> onCutRequested?.invoke()
+            MenuItemOption.SelectAll.id -> onSelectAllRequested?.invoke()
+            else -> return false
+        }
+        mode?.finish()
+        return true
+    }
+
+    fun onDestroyActionMode() {
+        onActionModeDestroy?.invoke()
+    }
+
+    @VisibleForTesting
+    internal fun updateMenuItems(menu: Menu) {
+        addOrRemoveMenuItem(menu, MenuItemOption.Copy, onCopyRequested)
+        addOrRemoveMenuItem(menu, MenuItemOption.Paste, onPasteRequested)
+        addOrRemoveMenuItem(menu, MenuItemOption.Cut, onCutRequested)
+        addOrRemoveMenuItem(menu, MenuItemOption.SelectAll, onSelectAllRequested)
+    }
+
+    internal fun addMenuItem(menu: Menu, item: MenuItemOption) {
+        menu.add(0, item.id, item.order, item.titleResource)
+            .setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM)
+    }
+
+    private fun addOrRemoveMenuItem(
+        menu: Menu,
+        item: MenuItemOption,
+        callback: (() -> Unit)?
+    ) {
+        when {
+            callback != null && menu.findItem(item.id) == null -> addMenuItem(menu, item)
+            callback == null && menu.findItem(item.id) != null -> menu.removeItem(item.id)
+        }
+    }
+}
+
+internal enum class MenuItemOption(val id: Int) {
+    Copy(0),
+    Paste(1),
+    Cut(2),
+    SelectAll(3);
+
+    val titleResource: Int
+        get() = when (this) {
+            Copy -> android.R.string.copy
+            Paste -> android.R.string.paste
+            Cut -> android.R.string.cut
+            SelectAll -> android.R.string.selectAll
+        }
+
+    /**
+     * This item will be shown before all items that have order greater than this value.
+     */
+    val order = id
+}