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.databinding.InverseBindingListener; 22 import android.databinding.InverseBindingMethod; 23 import android.databinding.InverseBindingMethods; 24 import android.view.View; 25 import android.widget.AbsListView; 26 import android.widget.AdapterView; 27 import android.widget.AdapterView.OnItemSelectedListener; 28 29 @BindingMethods({ 30 @BindingMethod(type = AdapterView.class, attribute = "android:onItemClick", method = "setOnItemClickListener"), 31 @BindingMethod(type = AdapterView.class, attribute = "android:onItemLongClick", method = "setOnItemLongClickListener"), 32 }) 33 @InverseBindingMethods({ 34 @InverseBindingMethod(type = AbsListView.class, attribute = "android:selectedItemPosition"), 35 }) 36 public class AdapterViewBindingAdapter { 37 38 @BindingAdapter("android:selectedItemPosition") 39 public static void setSelectedItemPosition(AdapterView view, int position) { 40 if (view.getSelectedItemPosition() != position) { 41 view.setSelection(position); 42 } 43 } 44 45 @BindingAdapter(value = {"android:onItemSelected", "android:onNothingSelected", 46 "android:selectedItemPositionAttrChanged"}, requireAll = false) 47 public static void setOnItemSelectedListener(AdapterView view, final OnItemSelected selected, 48 final OnNothingSelected nothingSelected, final InverseBindingListener attrChanged) { 49 if (selected == null && nothingSelected == null && attrChanged == null) { 50 view.setOnItemSelectedListener(null); 51 } else { 52 view.setOnItemSelectedListener( 53 new OnItemSelectedComponentListener(selected, nothingSelected, attrChanged)); 54 } 55 } 56 57 public static class OnItemSelectedComponentListener implements OnItemSelectedListener { 58 private final OnItemSelected mSelected; 59 private final OnNothingSelected mNothingSelected; 60 private final InverseBindingListener mAttrChanged; 61 62 public OnItemSelectedComponentListener(OnItemSelected selected, 63 OnNothingSelected nothingSelected, InverseBindingListener attrChanged) { 64 this.mSelected = selected; 65 this.mNothingSelected = nothingSelected; 66 this.mAttrChanged = attrChanged; 67 } 68 69 @Override 70 public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 71 if (mSelected != null) { 72 mSelected.onItemSelected(parent, view, position, id); 73 } 74 if (mAttrChanged != null) { 75 mAttrChanged.onChange(); 76 } 77 } 78 79 @Override 80 public void onNothingSelected(AdapterView<?> parent) { 81 if (mNothingSelected != null) { 82 mNothingSelected.onNothingSelected(parent); 83 } 84 if (mAttrChanged != null) { 85 mAttrChanged.onChange(); 86 } 87 } 88 } 89 90 public interface OnItemSelected { 91 void onItemSelected(AdapterView<?> parent, View view, int position, long id); 92 } 93 94 public interface OnNothingSelected { 95 void onNothingSelected(AdapterView<?> parent); 96 } 97 } 98
