xiaomi-note/week-01/ui/NotesListAdapter.java

/*
 * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.micode.notes.ui;

import android.content.Context;
import android.database.Cursor;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CursorAdapter;

import net.micode.notes.data.Notes;
import net.micode.notes.tool.SlideHelper;
import net.micode.notes.tool.onContentClickListener;

import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;

//链接前端后端，关联数据库
public class NotesListAdapter extends CursorAdapter {
    public static final SlideHelper slideHelper = new SlideHelper();
    private static final String TAG = "NotesListAdapter";
    private Context mContext;
    private HashMap<Integer, Boolean> mSelectedIndex;
    private int mNotesCount;
    private boolean mChoiceMode;
    //挂件包括挂件的id与类型
    private onContentClickListener mContentClick;

    //便签列表适配器
    public NotesListAdapter(Context context, onContentClickListener contentClick) {
        super(context, null);
        mSelectedIndex = new HashMap<Integer, Boolean>();
        mContext = context;
        mNotesCount = 0;
        mContentClick = contentClick;
    }

    //创建新的视图，参数为链接，游标（光标的类型），视图组件
    @Override
    public View newView(Context context, Cursor cursor, ViewGroup parent) {
        return new NotesListItem(mContext);
    }
    //点击事件
    @Override
    public void bindView(View view, Context context, Cursor cursor) {
        if (view instanceof NotesListItem) {
            NoteItemData itemData = new NoteItemData(context, cursor);
            ((NotesListItem) view).bind(context, itemData, mChoiceMode,
                    isSelectedItem(cursor.getPosition()));
            /*添加内容区域点击事件*/
            ((NotesListItem) view).setOnContentClick(mContentClick, cursor.getPosition());
        }
    }
    //部件布局
    public void setCheckedItem(final int position, final boolean checked) {
        mSelectedIndex.put(position, checked);
        notifyDataSetChanged();
    }
    //是否进行移动
    public boolean isInChoiceMode() {
        return mChoiceMode;
    }
    //改变移动
    public void setChoiceMode(boolean mode) {
        mSelectedIndex.clear();
        mChoiceMode = mode;
    }
    //在数据库搜索全部数据
    public void selectAll(boolean checked) {
        Cursor cursor = getCursor();//设置游标
        for (int i = 0; i < getCount(); i++) {//遍历所有数据
            if (cursor.moveToPosition(i)) { //移动游标
                if (NoteItemData.getNoteType(cursor) == Notes.TYPE_NOTE) {
                    setCheckedItem(i, checked);
                }
            }
        }
    }
    //批量搜寻数据id
    public HashSet<Long> getSelectedItemIds() {
        HashSet<Long> itemSet = new HashSet<Long>();
        for (Integer position : mSelectedIndex.keySet()) {
            if (mSelectedIndex.get(position) == true) {
                Long id = getItemId(position);
                if (id == Notes.ID_ROOT_FOLDER) {
                    Log.d(TAG, "Wrong item id, should not happen");//没有搜索到所需数据
                } else {
                    itemSet.add(id);
                }
            }
        }

        return itemSet;
    }
    //设置搜索数据部件
    public HashSet<AppWidgetAttribute> getSelectedWidget() {
        HashSet<AppWidgetAttribute> itemSet = new HashSet<AppWidgetAttribute>();//传递参数：键-值
        for (Integer position : mSelectedIndex.keySet()) {
            if (mSelectedIndex.get(position) == true) {//触发此时位置
                Cursor c = (Cursor) getItem(position);
                if (c != null) {
                    AppWidgetAttribute widget = new AppWidgetAttribute();
                    NoteItemData item = new NoteItemData(mContext, c);
                    widget.widgetId = item.getWidgetId();
                    widget.widgetType = item.getWidgetType();
                    itemSet.add(widget);
                    /**
                     * Don't close cursor here, only the adapter could close it不能关闭游标，只有适配器才能控制
                     */
                } else {
                    Log.e(TAG, "Invalid cursor");
                    return null;
                }
            }
        }
        return itemSet;
    }
    //搜索数据个数记录
    public int getSelectedCount() {
        Collection<Boolean> values = mSelectedIndex.values();//收集boolean类型的数据
        if (null == values) {
            return 0;
        }
        Iterator<Boolean> iter = values.iterator();
        int count = 0;
        while (iter.hasNext()) {
            if (true == iter.next()) {
                count++;
            }
        }
        return count;//技术
    }
    //是否搜索到指定位置项目
    public boolean isAllSelected() {
        int checkedCount = getSelectedCount();
        return (checkedCount != 0 && checkedCount == mNotesCount);
    }
    //判断是否所搜完毕
    public boolean isSelectedItem(final int position) {
        if (null == mSelectedIndex.get(position)) {
            return false;
        }
        return mSelectedIndex.get(position);
    }
    //关系发生变换
    @Override
    protected void onContentChanged() {
        super.onContentChanged();
        calcNotesCount();
    }
    //改变游标
    @Override
    public void changeCursor(Cursor cursor) {
        super.changeCursor(cursor);
        calcNotesCount();
    }
    //记录便签的数量
    private void calcNotesCount() {
        mNotesCount = 0;
        for (int i = 0; i < getCount(); i++) {
            Cursor c = (Cursor) getItem(i);
            if (c != null) {
                if (NoteItemData.getNoteType(c) == Notes.TYPE_NOTE) {
                    mNotesCount++;
                }
            } else {
                Log.e(TAG, "Invalid cursor");
                return;
            }
        }
    }

    public static class AppWidgetAttribute {
        public int widgetId;
        public int widgetType;
    }
}