TextActionModeCallback.android.kt
/*
* Copyright 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.compose.ui.platform.actionmodecallback
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
}