/*
 * 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 是一个封装了下拉菜单功能的组件，结合 Button 和 PopupMenu 实现。
 * 用于在 UI 中提供点击按钮弹出菜单的功能，常用于操作菜单或选项选择。
 */
public class DropdownMenu {
/** 触发菜单显示的按钮对象 */
private Button mButton;

/** 弹出菜单实例 */
private PopupMenu mPopupMenu;

/** 菜单对象，用于管理菜单项 */
private Menu mMenu;
/**
 * 创建并初始化一个下拉菜单。
 *
 * @param context 上下文对象
 * @param button  关联的按钮控件
 * @param menuId  菜单资源 ID
 */
    public DropdownMenu(Context context, Button button, int menuId) {
        mButton = button;
        mButton.setBackgroundResource(R.drawable.dropdown_icon);
        mPopupMenu = new PopupMenu(context, mButton);
        mMenu = mPopupMenu.getMenu();
        mPopupMenu.getMenuInflater().inflate(menuId, mMenu);
        mButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                mPopupMenu.show();
            }
        });
    }
/**
 * 设置菜单项点击事件监听器。
 *
 * @param listener 菜单项点击监听器
 */
    public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
        if (mPopupMenu != null) {
            mPopupMenu.setOnMenuItemClickListener(listener);
        }
    }
/**
 * 根据菜单项 ID 查找对应的 MenuItem。
 *
 * @param id 菜单项 ID
 * @return 找到的 MenuItem 对象
 */
    public MenuItem findItem(int id) {
        return mMenu.findItem(id);
    }
/**
 * 设置触发按钮的显示文本（即菜单标题）。
 *
 * @param title 要设置的标题
 */
    public void setTitle(CharSequence title) {
        mButton.setText(title);
    }
}
