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 */ 16package android.databinding.adapters; 17 18import android.databinding.BindingAdapter; 19import android.databinding.BindingMethod; 20import android.databinding.BindingMethods; 21import android.view.View; 22import android.widget.AdapterView; 23import android.widget.AdapterView.OnItemSelectedListener; 24 25@BindingMethods({ 26 @BindingMethod(type = AdapterView.class, attribute = "android:onItemClick", method = "setOnItemClickListener"), 27 @BindingMethod(type = AdapterView.class, attribute = "android:onItemLongClick", method = "setOnItemLongClickListener"), 28}) 29public class AdapterViewBindingAdapter { 30 31 @BindingAdapter("android:onItemSelected") 32 public static void setListener(AdapterView view, OnItemSelected listener) { 33 setListener(view, listener, null); 34 } 35 36 @BindingAdapter("android:onNothingSelected") 37 public static void setListener(AdapterView view, OnNothingSelected listener) { 38 setListener(view, null, listener); 39 } 40 41 @BindingAdapter({"android:onItemSelected", "android:onNothingSelected"}) 42 public static void setListener(AdapterView view, final OnItemSelected selected, 43 final OnNothingSelected nothingSelected) { 44 if (selected == null && nothingSelected == null) { 45 view.setOnItemSelectedListener(null); 46 } else { 47 view.setOnItemSelectedListener( 48 new OnItemSelectedComponentListener(selected, nothingSelected)); 49 } 50 } 51 52 public static class OnItemSelectedComponentListener implements OnItemSelectedListener { 53 private final OnItemSelected mSelected; 54 private final OnNothingSelected mNothingSelected; 55 56 public OnItemSelectedComponentListener(OnItemSelected selected, 57 OnNothingSelected nothingSelected) { 58 this.mSelected = selected; 59 this.mNothingSelected = nothingSelected; 60 } 61 @Override 62 public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 63 if (mSelected != null) { 64 mSelected.onItemSelected(parent, view, position, id); 65 } 66 } 67 68 @Override 69 public void onNothingSelected(AdapterView<?> parent) { 70 if (mNothingSelected != null) { 71 mNothingSelected.onNothingSelected(parent); 72 } 73 } 74 } 75 76 public interface OnItemSelected { 77 void onItemSelected(AdapterView<?> parent, View view, int position, long id); 78 } 79 80 public interface OnNothingSelected { 81 void onNothingSelected(AdapterView<?> parent); 82 } 83} 84