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      1 /*
      2  * Copyright (C) 2016 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 
     17 package com.android.deskclock.uidata;
     18 
     19 import com.android.deskclock.uidata.UiDataModel.Tab;
     20 
     21 /**
     22  * The interface through which interested parties are notified of changes to the vertical scroll
     23  * position of the selected tab. Callbacks to listener occur when any of these events occur:
     24  *
     25  * <ul>
     26  *     <li>the vertical scroll position of the selected tab is now scrolled to the top</li>
     27  *     <li>the vertical scroll position of the selected tab is no longer scrolled to the top</li>
     28  *     <li>the selected tab changed and the new tab scroll state does not match the prior tab</li>
     29  * </ul>
     30  */
     31 public interface TabScrollListener {
     32 
     33     /**
     34      * @param selectedTab an enumerated value indicating the current selected tab
     35      * @param scrolledToTop indicates whether the current selected tab is scrolled to its top
     36      */
     37     void selectedTabScrollToTopChanged(Tab selectedTab, boolean scrolledToTop);
     38 }