/*
 * 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;

//DropdownMenu类，用来创建和显示一个下拉菜单
public class DropdownMenu {
    private Button mButton;//按钮成员变量，用于触发下拉菜单
    private PopupMenu mPopupMenu;//弹出菜单的成员变量，用于显示菜单项
    private Menu mMenu;//菜单成员变量，包含了具体的菜单项


    public DropdownMenu(Context context, Button button, int menuId) {
        mButton = button;//将传入的按钮引用赋值给mButton
        mButton.setBackgroundResource(R.drawable.dropdown_icon);//设置这个按钮的背景为下拉图标
        mPopupMenu = new PopupMenu(context, mButton);//初始化PopupMenu
        mMenu = mPopupMenu.getMenu();//获取PopupMenu关联的Menu对象
        mPopupMenu.getMenuInflater().inflate(menuId, mMenu);//使用传入的menuId资源填充Menu
        mButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                mPopupMenu.show();
            }//显示菜单
        });
    }

    //设置菜单项点击监听器
    public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
        if (mPopupMenu != null) {
            mPopupMenu.setOnMenuItemClickListener(listener);
        }
    }

    //查找具体的菜单项
    public MenuItem findItem(int id) {
        return mMenu.findItem(id);
    }

    //设置按钮的标题文字
    public void setTitle(CharSequence title) {
        mButton.setText(title);
    }
}
