/*
 * 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;

/**
 * 下拉菜单组件
 * 封装PopupMenu的自定义下拉菜单控件
 * 功能特点：
 * - 提供简洁的下拉菜单交互
 * - 支持自定义菜单项
 * - 支持菜单项点击事件监听
 * - 适配不同屏幕尺寸和布局
 *
 * 使用场景：
 * - 工具栏操作选项
 * - 上下文菜单
 * - 筛选条件选择
 */
public class DropdownMenu {
    // 触发下拉菜单的按钮
    private Button mButton;

    // 系统PopupMenu实例
    private PopupMenu mPopupMenu;

    // 菜单对象
    private Menu mMenu;

    /**
     * 构造函数
     * @param context 上下文
     * @param button 触发菜单的按钮
     * @param menuId 菜单资源ID
     */
    public DropdownMenu(Context context, Button button, int menuId) {
        mButton = button;

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

        // 初始化PopupMenu
        mPopupMenu = new PopupMenu(context, mButton);
        mMenu = mPopupMenu.getMenu();

        // 加载菜单资源
        mPopupMenu.getMenuInflater().inflate(menuId, mMenu);

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

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

    /**
     * 根据ID查找菜单项
     * @param id 菜单项ID
     * @return 对应的菜单项
     */
    public MenuItem findItem(int id) {
        return mMenu.findItem(id);
    }

    /**
     * 设置按钮标题
     * @param title 标题文本
     */
    public void setTitle(CharSequence title) {
        mButton.setText(title);
    }
}