/*
 * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
 *
 * 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 net.micode.notes.ui;

import android.content.Context;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.PopupMenu;
import android.widget.PopupMenu.OnMenuItemClickListener;

import net.micode.notes.R;
//引入类，和用到的工具
public class DropdownMenu {
    private Button mButton;//设置一个按钮
    private PopupMenu mPopupMenu;//声明下拉菜单
    private Menu mMenu;//菜单定义

    public DropdownMenu(Context context, Button button, int menuId) {
        mButton = button;
        mButton.setBackgroundResource(R.drawable.dropdown_icon);//实例按钮设置view的背景
        mPopupMenu = new PopupMenu(context, mButton);//弹出式菜单实例化实现
        mMenu = mPopupMenu.getMenu();
        //getMenuInflater：用以实例化menu目录下的menu布局文件并根据ID确定menu内容
        mPopupMenu.getMenuInflater().inflate(menuId, mMenu);//弹出式菜单视图
        mButton.setOnClickListener(new OnClickListener() {
            //设置监听
            public void onClick(View v) {
                mPopupMenu.show();
            }//下拉菜单，显示
        });
    }
    //首先是公有类DropdownMenu的私有数据成员申明,其中包括了对象按钮mButton,菜单对象mMenu和弹出菜单控件对象mPopupMenu

    public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
        if (mPopupMenu != null) {
            mPopupMenu.setOnMenuItemClickListener(listener);
        }//对菜单监听的设置
    }

    public MenuItem findItem(int id) {
        return mMenu.findItem(id);
    }//对于菜单选项的初始化，根据索引搜索菜单需要的选项

    public void setTitle(CharSequence title) {
        mButton.setText(title);
    }//设置标题
}