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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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* DropdownMenu 类用于创建一个下拉菜单，它将一个按钮与一个弹出菜单关联起来。
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* 当点击按钮时，会显示弹出菜单。
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*/
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public class DropdownMenu {
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// 用于触发弹出菜单的按钮
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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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// 弹出菜单的菜单对象
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private Menu mMenu;
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/**
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* 构造函数，用于初始化下拉菜单。
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*
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* @param context 上下文对象，用于创建弹出菜单
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* @param button 触发弹出菜单的按钮
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* @param menuId 菜单资源的 ID，用于指定弹出菜单的内容
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*/
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public DropdownMenu(Context context, Button button, int menuId) {
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// 保存传入的按钮对象
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mButton = button;
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// 设置按钮的背景资源为下拉图标
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mButton.setBackgroundResource(R.drawable.dropdown_icon);
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// 创建一个弹出菜单，将其关联到按钮上
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mPopupMenu = new PopupMenu(context, mButton);
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// 获取弹出菜单的菜单对象
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mMenu = mPopupMenu.getMenu();
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// 从指定的菜单资源 ID 中加载菜单内容到菜单对象中
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mPopupMenu.getMenuInflater().inflate(menuId, mMenu);
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// 为按钮设置点击监听器，当按钮被点击时显示弹出菜单
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mButton.setOnClickListener(new OnClickListener() {
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public void onClick(View v) {
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mPopupMenu.show();
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}
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});
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}
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/**
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* 设置下拉菜单中菜单项的点击监听器。
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*
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* @param listener 菜单项点击监听器对象
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*/
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public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
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// 检查弹出菜单是否为空
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if (mPopupMenu != null) {
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// 设置弹出菜单的菜单项点击监听器
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mPopupMenu.setOnMenuItemClickListener(listener);
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}
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}
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/**
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* 根据菜单项的 ID 查找对应的菜单项。
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*
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* @param id 菜单项的 ID
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* @return 找到的菜单项对象，如果未找到则返回 null
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*/
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public MenuItem findItem(int id) {
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// 在菜单对象中查找指定 ID 的菜单项
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return mMenu.findItem(id);
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}
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/**
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* 设置按钮的标题文本。
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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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// 设置按钮的文本为传入的标题文本
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mButton.setText(title);
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}
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} |
