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      1 /*
      2  * Copyright (C) 2015 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 package android.databinding.adapters;
     17 
     18 import android.databinding.BindingAdapter;
     19 import android.databinding.BindingMethod;
     20 import android.databinding.BindingMethods;
     21 import android.widget.AbsListView;
     22 import android.widget.AbsListView.OnScrollListener;
     23 
     24 @BindingMethods({
     25         @BindingMethod(type = AbsListView.class, attribute = "android:listSelector", method = "setSelector"),
     26         @BindingMethod(type = AbsListView.class, attribute = "android:scrollingCache", method = "setScrollingCacheEnabled"),
     27         @BindingMethod(type = AbsListView.class, attribute = "android:smoothScrollbar", method = "setSmoothScrollbarEnabled"),
     28         @BindingMethod(type = AbsListView.class, attribute = "android:onMovedToScrapHeap", method = "setRecyclerListener"),
     29 })
     30 public class AbsListViewBindingAdapter {
     31 
     32     @BindingAdapter(value = {"android:onScroll", "android:onScrollStateChanged"},
     33             requireAll = false)
     34     public static void setOnScroll(AbsListView view, final OnScroll scrollListener,
     35             final OnScrollStateChanged scrollStateListener) {
     36         view.setOnScrollListener(new OnScrollListener() {
     37             @Override
     38             public void onScrollStateChanged(AbsListView view, int scrollState) {
     39                 if (scrollStateListener != null) {
     40                     scrollStateListener.onScrollStateChanged(view, scrollState);
     41                 }
     42             }
     43 
     44             @Override
     45             public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
     46                     int totalItemCount) {
     47                 if (scrollListener != null) {
     48                     scrollListener
     49                             .onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
     50                 }
     51             }
     52         });
     53     }
     54 
     55     public interface OnScroll {
     56         void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
     57                 int totalItemCount);
     58     }
     59 
     60     public interface OnScrollStateChanged {
     61         void onScrollStateChanged(AbsListView view, int scrollState);
     62     }
     63 }
     64