1 /******************************************************************************* 2 * Copyright (C) 2012 Google Inc. 3 * Licensed to The Android Open Source Project. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 *******************************************************************************/ 17 18 package com.android.mail.ui; 19 20 /** 21 * Interface for classes that want to respond to changes in conversation sets. A conversation set 22 * is a list of conversations selected by the user to perform an action on. The user could select 23 * five conversations and delete them. The five conversations form a set. Constructing such a set 24 * involves many user actions: tapping on multiple checkboxes. This interface allows the class to 25 * listen to such user actions. 26 */ 27 public interface ConversationSetObserver { 28 // TODO(viki): Consider passing a mutable instance of ConversationCheckedSet. In the current 29 // implementation, the observers can wreck the selection set unknowingly!! 30 31 /** 32 * Called when the selection set becomes empty. 33 */ 34 void onSetEmpty(); 35 36 /** 37 * Handle when the selection set is populated with some items. The observer should not make any 38 * modifications to the set while handling this event. 39 */ 40 void onSetPopulated(ConversationCheckedSet set); 41 42 /** 43 * Handle when the selection set gets an element added or removed. The observer should not 44 * make any modifications to the set while handling this event. 45 */ 46 void onSetChanged(ConversationCheckedSet set); 47 } 48
