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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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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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* 下拉菜单封装类
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* 将Button和PopupMenu组合封装，提供便捷的下拉菜单功能
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* 主要用于笔记列表界面的排序、筛选等操作菜单
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*/
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public class DropdownMenu {
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private Button mButton; // 显示下拉菜单的按钮
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private PopupMenu mPopupMenu; // Android原生弹出菜单
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private Menu mMenu; // 菜单项容器
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/**
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* 构造函数
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* @param context 上下文环境
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* @param button 触发下拉菜单的按钮
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* @param menuId 菜单资源ID（R.menu.xxx）
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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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// 设置按钮背景为下拉箭头图标
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mButton.setBackgroundResource(R.drawable.dropdown_icon);
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// 创建PopupMenu，绑定到指定按钮
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mPopupMenu = new PopupMenu(context, mButton);
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mMenu = mPopupMenu.getMenu();
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// 从菜单资源文件加载菜单项
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mPopupMenu.getMenuInflater().inflate(menuId, mMenu);
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// 设置按钮点击事件：显示下拉菜单
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mButton.setOnClickListener(new OnClickListener() {
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public void onClick(View v) {
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mPopupMenu.show(); // 显示下拉菜单
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}
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});
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}
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/**
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* 设置菜单项点击监听器
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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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* 根据ID查找菜单项
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* @param id 菜单项资源ID
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* @return 找到的菜单项，未找到返回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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* 设置按钮显示的标题文本
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* @param title 要显示的文本
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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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} |
