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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.micode.notes.ui; // 定义类所在的包路径
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import android.content.Context; // 引入Context类，用于访问应用程序的上下文
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import android.view.Menu; // 引入Menu类，用于操作菜单
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import android.view.MenuItem; // 引入MenuItem类，用于菜单项的处理
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import android.view.View; // 引入View类，用于视图的操作
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import android.view.View.OnClickListener; // 引入OnClickListener接口，用于处理点击事件
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import android.widget.Button; // 引入Button类，用于显示按钮
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import android.widget.PopupMenu; // 引入PopupMenu类，用于显示弹出菜单
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import android.widget.PopupMenu.OnMenuItemClickListener; // 引入PopupMenu的菜单项点击监听器
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public class DropdownMenu {
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private Button mButton; // 用于显示的按钮，点击后弹出菜单
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private PopupMenu mPopupMenu; // 弹出菜单的实例
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private Menu mMenu; // 菜单项的集合
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// 构造函数，初始化DropdownMenu，设置按钮及其弹出菜单
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public DropdownMenu(Context context, Button button, int menuId) {
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mButton = button; // 获取传入的按钮对象
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mButton.setBackgroundResource(R.drawable.dropdown_icon); // 设置按钮的背景图标为下拉菜单图标
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mPopupMenu = new PopupMenu(context, mButton); // 初始化PopupMenu，指定按钮作为弹出菜单的锚点
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mMenu = mPopupMenu.getMenu(); // 获取PopupMenu中的Menu对象
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mPopupMenu.getMenuInflater().inflate(menuId, mMenu); // 使用传入的menuId加载菜单资源
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mButton.setOnClickListener(new OnClickListener() { // 为按钮设置点击事件监听器
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public void onClick(View v) {
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mPopupMenu.show(); // 当按钮被点击时，显示弹出菜单
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}
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});
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}
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// 设置菜单项点击事件监听器
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public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
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if (mPopupMenu != null) {
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mPopupMenu.setOnMenuItemClickListener(listener); // 设置PopupMenu的菜单项点击监听器
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}
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}
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// 根据菜单项的ID查找菜单项
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public MenuItem findItem(int id) {
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return mMenu.findItem(id); // 在菜单中查找具有指定ID的菜单项
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}
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// 设置按钮的文本
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public void setTitle(CharSequence title) {
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mButton.setText(title); // 设置按钮的文本为传入的title
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}
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}
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