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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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/*
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直译为便签表连接器，继承了CursorAdapter，它为cursor和ListView提供了连接的桥梁，
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所以NotesListAdapter实现的是鼠标和编辑便签链接的桥梁。
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*/
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public class NotesListAdapter extends CursorAdapter {
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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;//便签数
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private boolean mChoiceMode;//选择模式标记
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/*
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桌面widget的属性，包括编号和类型
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*/
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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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/*
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函数功能：初始化便签链接器（根据传进来的内容设置相关变量）
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*/
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public NotesListAdapter(Context context) {
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super(context, null);//父类对象置空
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mSelectedIndex = new HashMap<Integer, Boolean>();//新建选项下标的hash表
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mContext = context;
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mNotesCount = 0;
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}
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@Override
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/*
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函数功能：新建一个视图来存储光标所指向的数据（使用兄弟类NotesListItem新建一个项目选项）
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*/
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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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}
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/*
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函数功能：将已经存在的视图和鼠标指向的数据进行捆绑
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*/
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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) {//若view是NotesListItem的一个实例
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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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//则新建一个项目选项并且用bind跟将view和鼠标、内容、便签数据捆绑在一起
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}
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}
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/*
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函数功能：设置勾选框
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*/
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public void setCheckedItem(final int position, final boolean checked) {
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mSelectedIndex.put(position, checked);//根据定位和是否勾选设置下标
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notifyDataSetChanged();//在修改后刷新activity
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}
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/*
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函数功能：判断单选按钮是否勾选
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*/
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public boolean isInChoiceMode() {
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return mChoiceMode;
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}
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/*
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函数功能：设置单项选项框（重置下标并且根据参数mode设置选项）
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*/
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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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}
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/*
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函数功能：选择全部选项
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*/
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public void selectAll(boolean checked) {
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Cursor cursor = getCursor();//获取光标位置
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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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}
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}
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}
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//遍历所有光标可用的位置在判断为便签类型之后勾选单项框
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}
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/*
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建立选择项的下标列表
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*/
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public HashSet<Long> getSelectedItemIds() {
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HashSet<Long> itemSet = new HashSet<Long>();//建立hash表
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for (Integer position : mSelectedIndex.keySet()) {//遍历所有的关键
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if (mSelectedIndex.get(position) == true) {//若光标位置可用
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Long id = getItemId(position);
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if (id == Notes.ID_ROOT_FOLDER) {
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Log.d(TAG, "Wrong item id, should not happen");//原文件不需要添加
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} else {
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itemSet.add(id);
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}
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//则将id下标加入选项集合中
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}
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}
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return itemSet;
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}
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/*
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函数功能：建立桌面widget的选项表
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*/
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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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//以上4句和getSelectedItemIds一样
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if (c != null) {//若光标位置可用就建立新的widget属性并编辑下表和类型，最后添加到选项集中
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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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} else {
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Log.e(TAG, "Invalid cursor");
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return null;
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}
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}
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}
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return itemSet;
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}
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/*
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函数功能：获取选项个数
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*/
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public int getSelectedCount() {
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Collection<Boolean> values = mSelectedIndex.values();//首先获取选项下标的值
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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();//初始化叠加器
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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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//若value值为真，计数+1
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count++;
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}
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}
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return count;
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}
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/*
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函数功能：判断是否全部选中
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*/
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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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//获取选项数看是否等于便签的个数
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}
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/*
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函数功能：判断是否为选项表（通过传递的下标来确定）
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*/
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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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}
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@Override
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/*
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函数功能：在activity内容发生局部变动的时候回调该函数计算便签的数量
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*/
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protected void onContentChanged() {
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super.onContentChanged();
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//执行基类函数
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calcNotesCount();
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}
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@Override
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/*
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函数功能：在activity光标发生局部变动的时候回调该函数计算便签的数量
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*/
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public void changeCursor(Cursor cursor) {
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super.changeCursor(cursor);
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//执行基类函数
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calcNotesCount();
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}
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/*
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函数功能：计算便签数量
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*/
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private void calcNotesCount() {
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mNotesCount = 0;
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for (int i = 0; i < getCount(); i++) {//获取总数同时遍历
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Cursor c = (Cursor) getItem(i);
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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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//若该位置不为空并且文本类型为便签就+1
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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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}
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//否则报错
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}
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}
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}
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