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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.view.View;
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import android.view.ViewGroup;
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import android.widget.CursorAdapter;
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import android.widget.ListView;
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import net.micode.notes.data.Notes;
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import net.micode.notes.data.Notes.NoteColumns;
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import net.micode.notes.ui.NotesListItem.NoteItemData;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Map;
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import java.util.Set;
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// ... existing code ...
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/**
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* 笔记列表适配器
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*
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* 【功能说明】
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* 1. 继承CursorAdapter，用于在ListView中显示笔记列表
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* 2. 支持多选模式，可批量操作笔记
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* 3. 管理选中状态和桌面小部件信息
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* 4. 自动统计笔记和文件夹数量
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*/
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public class NotesListAdapter extends CursorAdapter {
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private Context mContext;
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private Map<Long, Boolean> mSelectedIndex;
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private int mChoiceMode;
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private int mCount;
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/**
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* 桌面小部件属性类
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* 用于存储小部件的ID和类型信息
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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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// 这里的索引顺序必须和 PROJECTION 数组完全一致
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private static final int ID = 0;
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private static final int SNIPPET = 1;
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private static final int TYPE = 2;
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private static final int MODIFIED_DATE = 3;
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private static final int ALERT_DATE = 4;
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private static final int BG_COLOR_ID = 5;
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private static final int PARENT_ID = 7;
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// 查询投影：包含笔记列表显示所需的所有字段
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public static final String[] PROJECTION = {
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NoteColumns.ID,
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NoteColumns.SNIPPET,
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NoteColumns.TYPE,
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NoteColumns.MODIFIED_DATE,
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NoteColumns.ALERTED_DATE,
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NoteColumns.BG_COLOR_ID,
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NoteColumns.HAS_ATTACHMENT,
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NoteColumns.PARENT_ID
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};
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/**
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* 构造函数
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* @param context 上下文对象
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*/
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public NotesListAdapter(Context context) {
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super(context, null);
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mSelectedIndex = new HashMap<>();
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mContext = context;
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mChoiceMode = 0;
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}
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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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mCount = 0;
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if (cursor != null) {
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mCount = cursor.getCount();
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}
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// 切换游标时清空选中状态
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mSelectedIndex.clear();
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}
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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(mContext);
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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) {
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NoteItemData itemData = new NoteItemData(context, cursor);
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((NotesListItem) view).bind(context, itemData, mChoiceMode == ListView.CHOICE_MODE_MULTIPLE,
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mSelectedIndex.containsKey(itemData.getId()) ? mSelectedIndex.get(itemData.getId()) : false);
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}
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}
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/**
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* 设置指定位置的笔记为选中或非选中状态
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* @param position 列表位置
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* @param checked true表示选中，false表示取消选中
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*/
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public void setCheckedItem(final int position, final boolean checked) {
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Cursor c = getCursor();
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if (c.moveToPosition(position)) {
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long id = c.getLong(ID);
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if (id >= 0) {
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mSelectedIndex.put(id, checked);
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}
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}
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notifyDataSetChanged();
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}
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/**
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* 设置选择模式
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* @param mode 选择模式（单选/多选/无）
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*/
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public void setChoiceMode(int mode) {
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mChoiceMode = mode;
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// 如果不是多选模式，清空选中状态
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if (mChoiceMode != ListView.CHOICE_MODE_MULTIPLE) {
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mSelectedIndex.clear();
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}
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}
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/**
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* 判断是否所有笔记都被选中
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* @return true表示全部选中
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*/
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public boolean isAllSelected() {
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int selectedCount = mSelectedIndex.size();
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return selectedCount == mCount && selectedCount > 0;
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}
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/**
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* 全选或全不选
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* @param checked true表示全选，false表示全不选
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*/
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public void selectAll(boolean checked) {
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Cursor c = getCursor();
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mSelectedIndex.clear();
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if (c != null) {
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for (int i = 0; i < c.getCount(); i++) {
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if (c.moveToPosition(i)) {
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long id = c.getLong(ID);
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if (id >= 0) {
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mSelectedIndex.put(id, checked);
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}
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}
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}
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}
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notifyDataSetChanged();
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}
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/**
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* 获取已选中的笔记数量
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* @return 选中数量
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*/
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public int getSelectedCount() {
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return mSelectedIndex.size();
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}
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/**
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* 获取所有已选中笔记的ID集合
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* @return 笔记ID集合
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*/
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public HashSet<Long> getSelectedItemIds() {
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HashSet<Long> ids = new HashSet<>();
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for (Map.Entry<Long, Boolean> entry : mSelectedIndex.entrySet()) {
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if (entry.getValue()) {
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ids.add(entry.getKey());
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}
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}
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return ids;
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}
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/**
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* 获取所有已选中笔记关联的桌面小部件信息
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* @return 小部件属性集合
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*/
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public HashSet<AppWidgetAttribute> getSelectedWidget() {
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HashSet<AppWidgetAttribute> widgets = new HashSet<>();
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Cursor c = getCursor();
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if (c != null) {
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int widgetIdIdx = c.getColumnIndex(NoteColumns.WIDGET_ID);
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int widgetTypeIdx = c.getColumnIndex(NoteColumns.TYPE);
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for (int i = 0; i < c.getCount(); i++) {
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if (c.moveToPosition(i)) {
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long id = c.getLong(ID);
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if (mSelectedIndex.containsKey(id) && mSelectedIndex.get(id)) {
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AppWidgetAttribute widget = new AppWidgetAttribute();
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if (widgetIdIdx >= 0) widget.widgetId = c.getInt(widgetIdIdx);
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if (widgetTypeIdx >= 0) widget.widgetType = c.getInt(widgetTypeIdx);
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widgets.add(widget);
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}
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}
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}
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}
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return widgets;
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}
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@Override
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public NoteItemData getItem(int position) {
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Cursor c = getCursor();
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if (c.moveToPosition(position)) {
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return new NoteItemData(mContext, c);
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}
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return null;
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}
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}
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