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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* 文件: DropdownMenu.java
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* 描述: 下拉菜单组件
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* 作用: 提供一个基于按钮和弹出菜单的下拉菜单组件
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* 功能:
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* 1. 将按钮与弹出菜单关联，点击按钮显示菜单
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* 2. 支持设置菜单项点击监听器
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* 3. 支持查找特定菜单项
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* 4. 支持设置按钮标题
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*/
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package net.micode.notes.ui;
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import android.content.Context;
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import android.view.Menu;
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import android.view.MenuItem;
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import android.view.View;
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import android.view.View.OnClickListener;
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import android.widget.Button;
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import android.widget.PopupMenu;
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import android.widget.PopupMenu.OnMenuItemClickListener;
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import net.micode.notes.R;
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/**
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* 下拉菜单组件类
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*
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* 这个类封装了一个基于按钮和PopupMenu的下拉菜单组件。
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* 用户点击按钮时，会显示一个下拉菜单，用户可以从中选择选项。
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* 组件支持设置菜单项点击监听器，以及查找特定菜单项和设置按钮标题。
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*/
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public class DropdownMenu {
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/** 触发菜单显示的按钮 */
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private Button mButton;
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/** 弹出菜单对象 */
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private PopupMenu mPopupMenu;
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/** 菜单对象，用于管理菜单项 */
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private Menu mMenu;
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/**
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* 构造函数
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*
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* @param context 上下文环境
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* @param button 用于触发菜单显示的按钮
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* @param menuId 菜单资源ID
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*/
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public DropdownMenu(Context context, Button button, int menuId) {
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mButton = button;
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// 设置按钮的背景为下拉图标
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mButton.setBackgroundResource(R.drawable.dropdown_icon);
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// 创建弹出菜单，并与按钮关联
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mPopupMenu = new PopupMenu(context, mButton);
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// 获取菜单对象
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mMenu = mPopupMenu.getMenu();
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// 从资源文件中加载菜单项
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mPopupMenu.getMenuInflater().inflate(menuId, mMenu);
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// 设置按钮点击监听器，点击时显示菜单
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mButton.setOnClickListener(new OnClickListener() {
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public void onClick(View v) {
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// 显示弹出菜单
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mPopupMenu.show();
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}
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});
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}
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/**
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* 设置下拉菜单项点击监听器
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*
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* @param listener 菜单项点击监听器
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*/
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public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
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if (mPopupMenu != null) {
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mPopupMenu.setOnMenuItemClickListener(listener);
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}
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}
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/**
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* 查找指定ID的菜单项
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*
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* @param id 要查找的菜单项ID
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* @return 找到的菜单项，如果不存在则返回null
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*/
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public MenuItem findItem(int id) {
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return mMenu.findItem(id);
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}
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/**
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* 设置按钮标题文本
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*
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* @param title 要设置的标题文本
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*/
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public void setTitle(CharSequence title) {
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mButton.setText(title);
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}
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}
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