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.databinding.InverseBindingListener;
22import android.databinding.InverseBindingMethod;
23import android.databinding.InverseBindingMethods;
24import android.view.View;
25import android.widget.AbsListView;
26import android.widget.AdapterView;
27import 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})
36public 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