/*
 * 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;

/**
 * 封装 PopupMenu 的下拉菜单控件。
 *
 * 提供一个按钮触发的下拉菜单功能，用于简化菜单操作流程。
 */
public class DropdownMenu {

    // 下拉菜单绑定的按钮控件
    private Button mButton;

    // Android 原生 PopupMenu 实例
    private PopupMenu mPopupMenu;

    // 菜单对象，用于操作菜单项
    private Menu mMenu;


    /**
     * 构造函数：初始化下拉菜单。
     *
     * @param context 上下文环境
     * @param button  绑定的按钮控件，点击该按钮弹出菜单
     * @param menuId  菜单资源ID（如 R.menu.xxx）
     */
    public DropdownMenu(Context context, Button button, int menuId) {
        mButton = button;

        // 设置按钮背景为下拉图标
        mButton.setBackgroundResource(R.drawable.dropdown_icon);

        // 创建 PopupMenu 实例
        mPopupMenu = new PopupMenu(context, mButton);

        // 获取菜单对象
        mMenu = mPopupMenu.getMenu();

        // 使用菜单资源填充 PopupMenu
        mPopupMenu.getMenuInflater().inflate(menuId, mMenu);

        // 设置按钮点击事件，点击时显示菜单
        mButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                mPopupMenu.show();
            }
        });
    }

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

    /**
     * 根据菜单项 ID 查找对应的 MenuItem 对象。
     *
     * @param id 菜单项资源 ID
     * @return 返回找到的 MenuItem 对象
     */
    public MenuItem findItem(int id) {
        return mMenu.findItem(id);
    }

    /**
     * 设置按钮显示的文本标题。
     *
     * @param title 要设置的标题文本
     */
    public void setTitle(CharSequence title) {
        mButton.setText(title);
    }

}