AdapterViewBindingAdapter.java revision 716ba89e7f459f49ea85070d4710c1d79d715298 
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