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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.database.Cursor;
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import android.util.Log;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.CursorAdapter;
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import net.micode.notes.data.Notes;
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Iterator;
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public class NotesListAdapter extends CursorAdapter {
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// 日志标签
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private static final String TAG = "NotesListAdapter";
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private Context mContext;
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private HashMap<Integer, Boolean> mSelectedIndex;
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private int mNotesCount;
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private boolean mChoiceMode;
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private Context mContext; // 上下文对象
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private HashMap<Integer, Boolean> mSelectedIndex; // 存储选中位置的映射表（位置 -> 选中状态）
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private int mNotesCount; // 普通笔记总数（排除文件夹）
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private boolean mChoiceMode; // 是否处于多选模式
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// 小部件属性封装类
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public static class AppWidgetAttribute {
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public int widgetId;
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public int widgetType;
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};
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public int widgetId; // 小部件ID
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public int widgetType; // 小部件类型
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}
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// 构造函数
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public NotesListAdapter(Context context) {
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super(context, null);
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mSelectedIndex = new HashMap<Integer, Boolean>();
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mContext = context;
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mNotesCount = 0;
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super(context, null); // 初始化CursorAdapter
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mSelectedIndex = new HashMap<Integer, Boolean>(); // 初始化选中状态容器
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mContext = context; // 保存上下文引用
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mNotesCount = 0; // 初始化笔记数量
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}
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// 创建新列表项视图
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@Override
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public View newView(Context context, Cursor cursor, ViewGroup parent) {
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return new NotesListItem(context);
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return new NotesListItem(context); // 实例化自定义列表项视图
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}
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// 绑定数据到列表项视图
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@Override
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public void bindView(View view, Context context, Cursor cursor) {
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if (view instanceof NotesListItem) {
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NoteItemData itemData = new NoteItemData(context, cursor);
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((NotesListItem) view).bind(context, itemData, mChoiceMode,
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isSelectedItem(cursor.getPosition()));
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if (view instanceof NotesListItem) { // 类型安全检查
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NoteItemData itemData = new NoteItemData(context, cursor); // 创建数据包装对象
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// 绑定数据到视图，传递多选模式和选中状态
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((NotesListItem) view).bind(context, itemData, mChoiceMode, isSelectedItem(cursor.getPosition()));
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}
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}
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// 设置指定位置选中状态
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public void setCheckedItem(final int position, final boolean checked) {
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mSelectedIndex.put(position, checked);
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notifyDataSetChanged();
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mSelectedIndex.put(position, checked); // 更新选中状态映射表
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notifyDataSetChanged(); // 触发视图刷新
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}
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// 检查是否处于多选模式
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public boolean isInChoiceMode() {
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return mChoiceMode;
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return mChoiceMode; // 返回当前多选模式状态
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}
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// 切换多选模式
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public void setChoiceMode(boolean mode) {
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mSelectedIndex.clear();
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mChoiceMode = mode;
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mSelectedIndex.clear(); // 清空选中记录
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mChoiceMode = mode; // 更新多选模式状态
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}
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// 全选/取消全选操作
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public void selectAll(boolean checked) {
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Cursor cursor = getCursor();
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for (int i = 0; i < getCount(); i++) {
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if (cursor.moveToPosition(i)) {
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if (NoteItemData.getNoteType(cursor) == Notes.TYPE_NOTE) {
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setCheckedItem(i, checked);
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Cursor cursor = getCursor(); // 获取数据游标
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for (int i = 0; i < getCount(); i++) { // 遍历所有数据项
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if (cursor.moveToPosition(i)) { // 移动游标到指定位置
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if (NoteItemData.getNoteType(cursor) == Notes.TYPE_NOTE) { // 仅处理普通笔记类型
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setCheckedItem(i, checked); // 设置选中状态
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}
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}
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}
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}
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// 获取选中项ID集合
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public HashSet<Long> getSelectedItemIds() {
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HashSet<Long> itemSet = new HashSet<Long>();
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for (Integer position : mSelectedIndex.keySet()) {
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if (mSelectedIndex.get(position) == true) {
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Long id = getItemId(position);
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if (id == Notes.ID_ROOT_FOLDER) {
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HashSet<Long> itemSet = new HashSet<Long>(); // 创建ID集合
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for (Integer position : mSelectedIndex.keySet()) { // 遍历选中项
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if (mSelectedIndex.get(position)) { // 检查选中状态
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Long id = getItemId(position); // 获取数据库ID
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if (id == Notes.ID_ROOT_FOLDER) { // 过滤根文件夹ID
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Log.d(TAG, "Wrong item id, should not happen");
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} else {
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itemSet.add(id);
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itemSet.add(id); // 添加有效ID到集合
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}
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}
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}
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return itemSet;
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return itemSet; // 返回结果集合
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}
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// 获取选中项的小部件属性
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public HashSet<AppWidgetAttribute> getSelectedWidget() {
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HashSet<AppWidgetAttribute> itemSet = new HashSet<AppWidgetAttribute>();
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for (Integer position : mSelectedIndex.keySet()) {
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if (mSelectedIndex.get(position) == true) {
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Cursor c = (Cursor) getItem(position);
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for (Integer position : mSelectedIndex.keySet()) { // 遍历选中位置
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if (mSelectedIndex.get(position)) { // 检查选中状态
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Cursor c = (Cursor) getItem(position); // 获取对应游标
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if (c != null) {
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AppWidgetAttribute widget = new AppWidgetAttribute();
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NoteItemData item = new NoteItemData(mContext, c);
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widget.widgetId = item.getWidgetId();
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widget.widgetType = item.getWidgetType();
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itemSet.add(widget);
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/**
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* Don't close cursor here, only the adapter could close it
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*/
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AppWidgetAttribute widget = new AppWidgetAttribute(); // 创建属性对象
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NoteItemData item = new NoteItemData(mContext, c); // 包装数据
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widget.widgetId = item.getWidgetId(); // 设置小部件ID
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widget.widgetType = item.getWidgetType(); // 设置小部件类型
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itemSet.add(widget); // 添加到集合
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} else {
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Log.e(TAG, "Invalid cursor");
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return null;
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Log.e(TAG, "Invalid cursor"); // 错误日志记录
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return null; // 返回空值
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}
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}
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}
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return itemSet;
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return itemSet; // 返回结果集合
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}
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// 统计选中项数量
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public int getSelectedCount() {
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Collection<Boolean> values = mSelectedIndex.values();
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if (null == values) {
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return 0;
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}
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Iterator<Boolean> iter = values.iterator();
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int count = 0;
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while (iter.hasNext()) {
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if (true == iter.next()) {
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count++;
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}
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Collection<Boolean> values = mSelectedIndex.values(); // 获取所有状态值
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if (values == null) return 0; // 空值保护
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Iterator<Boolean> iter = values.iterator(); // 创建迭代器
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int count = 0; // 计数器初始化
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while (iter.hasNext()) { // 遍历状态集合
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if (iter.next()) count++; // 统计选中状态数量
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}
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return count;
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return count; // 返回总数
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}
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// 检查是否全选
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public boolean isAllSelected() {
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int checkedCount = getSelectedCount();
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return (checkedCount != 0 && checkedCount == mNotesCount);
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int checkedCount = getSelectedCount(); // 获取当前选中数
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return (checkedCount != 0 && checkedCount == mNotesCount); // 比较总数
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}
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// 检查指定位置是否选中
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public boolean isSelectedItem(final int position) {
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if (null == mSelectedIndex.get(position)) {
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return false;
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}
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return mSelectedIndex.get(position);
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Boolean result = mSelectedIndex.get(position); // 获取选中状态
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return result != null ? result : false; // 空值安全处理
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}
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// 数据变更回调
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@Override
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protected void onContentChanged() {
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super.onContentChanged();
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calcNotesCount();
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super.onContentChanged(); // 调用父类方法
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calcNotesCount(); // 重新计算笔记数量
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}
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// 切换数据游标
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@Override
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public void changeCursor(Cursor cursor) {
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super.changeCursor(cursor);
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calcNotesCount();
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super.changeCursor(cursor); // 调用父类方法
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calcNotesCount(); // 重新计算笔记数量
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}
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// 计算普通笔记数量
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private void calcNotesCount() {
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mNotesCount = 0;
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for (int i = 0; i < getCount(); i++) {
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Cursor c = (Cursor) getItem(i);
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mNotesCount = 0; // 重置计数器
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for (int i = 0; i < getCount(); i++) { // 遍历所有数据项
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Cursor c = (Cursor) getItem(i); // 获取游标对象
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if (c != null) {
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if (NoteItemData.getNoteType(c) == Notes.TYPE_NOTE) {
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mNotesCount++;
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if (NoteItemData.getNoteType(c) == Notes.TYPE_NOTE) { // 类型检查
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mNotesCount++; // 计数普通笔记
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}
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} else {
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Log.e(TAG, "Invalid cursor");
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return;
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Log.e(TAG, "Invalid cursor"); // 错误日志
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return; // 提前退出
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}
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}
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}
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}
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