MessagesAdapter.java revision 31d9acbf0623872f9d4a2b3210b5970854b654c7 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.email.activity;
18
19import com.android.email.Email;
20import com.android.email.ResourceHelper;
21import com.android.email.data.ThrottlingCursorLoader;
22import com.android.emailcommon.Logging;
23import com.android.emailcommon.provider.EmailContent;
24import com.android.emailcommon.provider.EmailContent.Message;
25import com.android.emailcommon.provider.EmailContent.MessageColumns;
26import com.android.emailcommon.utility.Utility;
27
28import android.content.Context;
29import android.content.Loader;
30import android.database.Cursor;
31import android.os.Bundle;
32import android.util.Log;
33import android.view.View;
34import android.view.ViewGroup;
35import android.widget.CursorAdapter;
36
37import java.util.HashSet;
38import java.util.Set;
39
40
41/**
42 * This class implements the adapter for displaying messages based on cursors.
43 */
44/* package */ class MessagesAdapter extends CursorAdapter {
45    private static final String STATE_CHECKED_ITEMS =
46            "com.android.email.activity.MessagesAdapter.checkedItems";
47
48    /* package */ static final String[] MESSAGE_PROJECTION = new String[] {
49        EmailContent.RECORD_ID, MessageColumns.MAILBOX_KEY, MessageColumns.ACCOUNT_KEY,
50        MessageColumns.DISPLAY_NAME, MessageColumns.SUBJECT, MessageColumns.TIMESTAMP,
51        MessageColumns.FLAG_READ, MessageColumns.FLAG_FAVORITE, MessageColumns.FLAG_ATTACHMENT,
52        MessageColumns.FLAGS, MessageColumns.SNIPPET
53    };
54
55    public static final int COLUMN_ID = 0;
56    public static final int COLUMN_MAILBOX_KEY = 1;
57    public static final int COLUMN_ACCOUNT_KEY = 2;
58    public static final int COLUMN_DISPLAY_NAME = 3;
59    public static final int COLUMN_SUBJECT = 4;
60    public static final int COLUMN_DATE = 5;
61    public static final int COLUMN_READ = 6;
62    public static final int COLUMN_FAVORITE = 7;
63    public static final int COLUMN_ATTACHMENTS = 8;
64    public static final int COLUMN_FLAGS = 9;
65    public static final int COLUMN_SNIPPET = 10;
66
67    private final ResourceHelper mResourceHelper;
68
69    /** If true, show color chips. */
70    private boolean mShowColorChips;
71
72    /**
73     * Set of seleced message IDs.
74     */
75    private final HashSet<Long> mSelectedSet = new HashSet<Long>();
76
77    /**
78     * Callback from MessageListAdapter.  All methods are called on the UI thread.
79     */
80    public interface Callback {
81        /** Called when the use starts/unstars a message */
82        void onAdapterFavoriteChanged(MessageListItem itemView, boolean newFavorite);
83        /** Called when the user selects/unselects a message */
84        void onAdapterSelectedChanged(MessageListItem itemView, boolean newSelected,
85                int mSelectedCount);
86    }
87
88    private final Callback mCallback;
89
90    public MessagesAdapter(Context context, Callback callback) {
91        super(context.getApplicationContext(), null, 0 /* no auto requery */);
92        mResourceHelper = ResourceHelper.getInstance(context);
93        mCallback = callback;
94    }
95
96    public void onSaveInstanceState(Bundle outState) {
97        Set<Long> checkedset = getSelectedSet();
98        long[] checkedarray = new long[checkedset.size()];
99        int i = 0;
100        for (Long l : checkedset) {
101            checkedarray[i] = l;
102            i++;
103        }
104        outState.putLongArray(STATE_CHECKED_ITEMS, checkedarray);
105    }
106
107    public void loadState(Bundle savedInstanceState) {
108        Set<Long> checkedset = getSelectedSet();
109        for (long l: savedInstanceState.getLongArray(STATE_CHECKED_ITEMS)) {
110            checkedset.add(l);
111        }
112    }
113
114    /**
115     * Set true for combined mailboxes.
116     */
117    public void setShowColorChips(boolean show) {
118        mShowColorChips = show;
119    }
120
121    public Set<Long> getSelectedSet() {
122        return mSelectedSet;
123    }
124
125    public boolean isSelected(MessageListItem itemView) {
126        return mSelectedSet.contains(itemView.mMessageId);
127    }
128
129    @Override
130    public void bindView(View view, Context context, Cursor cursor) {
131        // Reset the view (in case it was recycled) and prepare for binding
132        MessageListItem itemView = (MessageListItem) view;
133        itemView.bindViewInit(this);
134
135        // Load the public fields in the view (for later use)
136        itemView.mMessageId = cursor.getLong(COLUMN_ID);
137        itemView.mMailboxId = cursor.getLong(COLUMN_MAILBOX_KEY);
138        final long accountId = cursor.getLong(COLUMN_ACCOUNT_KEY);
139        itemView.mAccountId = accountId;
140        itemView.mRead = cursor.getInt(COLUMN_READ) != 0;
141        itemView.mIsFavorite = cursor.getInt(COLUMN_FAVORITE) != 0;
142        itemView.mHasInvite =
143            (cursor.getInt(COLUMN_FLAGS) & Message.FLAG_INCOMING_MEETING_INVITE) != 0;
144        itemView.mHasAttachment = cursor.getInt(COLUMN_ATTACHMENTS) != 0;
145        itemView.mTimestamp = cursor.getLong(COLUMN_DATE);
146        itemView.mSender = cursor.getString(COLUMN_DISPLAY_NAME);
147        itemView.mSnippet = cursor.getString(COLUMN_SNIPPET);
148        itemView.mSubject = cursor.getString(COLUMN_SUBJECT);
149        itemView.mSnippetLineCount = MessageListItem.NEEDS_LAYOUT;
150        itemView.mColorChipPaint =
151            mShowColorChips ? mResourceHelper.getAccountColorPaint(accountId) : null;
152    }
153
154    @Override
155    public View newView(Context context, Cursor cursor, ViewGroup parent) {
156        //return mInflater.inflate(R.layout.message_list_item, parent, false);
157        MessageListItem item = new MessageListItem(context);
158        item.setVisibility(View.VISIBLE);
159        return item;
160    }
161
162    public void toggleSelected(MessageListItem itemView) {
163        updateSelected(itemView, !isSelected(itemView));
164    }
165
166    /**
167     * This is used as a callback from the list items, to set the selected state
168     *
169     * <p>Must be called on the UI thread.
170     *
171     * @param itemView the item being changed
172     * @param newSelected the new value of the selected flag (checkbox state)
173     */
174    private void updateSelected(MessageListItem itemView, boolean newSelected) {
175        if (newSelected) {
176            mSelectedSet.add(itemView.mMessageId);
177        } else {
178            mSelectedSet.remove(itemView.mMessageId);
179        }
180        if (mCallback != null) {
181            mCallback.onAdapterSelectedChanged(itemView, newSelected, mSelectedSet.size());
182        }
183    }
184
185    /**
186     * This is used as a callback from the list items, to set the favorite state
187     *
188     * <p>Must be called on the UI thread.
189     *
190     * @param itemView the item being changed
191     * @param newFavorite the new value of the favorite flag (star state)
192     */
193    public void updateFavorite(MessageListItem itemView, boolean newFavorite) {
194        changeFavoriteIcon(itemView, newFavorite);
195        if (mCallback != null) {
196            mCallback.onAdapterFavoriteChanged(itemView, newFavorite);
197        }
198    }
199
200    private void changeFavoriteIcon(MessageListItem view, boolean isFavorite) {
201        view.invalidate();
202    }
203
204    public static Loader<Cursor> createLoader(Context context, long mailboxId) {
205        if (Email.DEBUG_LIFECYCLE && Email.DEBUG) {
206            Log.d(Logging.LOG_TAG, "MessagesAdapter createLoader mailboxId=" + mailboxId);
207        }
208        return new MessagesCursorLoader(context, mailboxId);
209
210    }
211
212    private static class MessagesCursorLoader extends ThrottlingCursorLoader {
213        private final Context mContext;
214        private final long mMailboxId;
215
216        public MessagesCursorLoader(Context context, long mailboxId) {
217            // Initialize with no where clause.  We'll set it later.
218            super(context, EmailContent.Message.CONTENT_URI,
219                    MESSAGE_PROJECTION, null, null,
220                    EmailContent.MessageColumns.TIMESTAMP + " DESC");
221            mContext = context;
222            mMailboxId = mailboxId;
223        }
224
225        @Override
226        public Cursor loadInBackground() {
227            // Determine the where clause.  (Can't do this on the UI thread.)
228            setSelection(Utility.buildMailboxIdSelection(mContext, mMailboxId));
229
230            // Then do a query.
231            return Utility.CloseTraceCursorWrapper.get(super.loadInBackground());
232        }
233    }
234}
235