1 /*
2  * Copyright (C) 2014 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 
17 package com.android.settings.notification;
18 
19 import android.content.Context;
20 import android.preference.Preference;
21 import android.util.AttributeSet;
22 import android.view.View;
23 import android.view.ViewGroup;
24 import android.widget.AdapterView;
25 import android.widget.ArrayAdapter;
26 import android.widget.Spinner;
27 import android.widget.AdapterView.OnItemSelectedListener;
28 
29 import java.util.ArrayList;
30 
31 public class DropDownPreference extends Preference {
32     private final Context mContext;
33     private final ArrayAdapter<String> mAdapter;
34     private final Spinner mSpinner;
35     private final ArrayList<Object> mValues = new ArrayList<Object>();
36 
37     private Callback mCallback;
38 
DropDownPreference(Context context)39     public DropDownPreference(Context context) {
40         this(context, null);
41     }
42 
DropDownPreference(Context context, AttributeSet attrs)43     public DropDownPreference(Context context, AttributeSet attrs) {
44         super(context, attrs);
45         mContext = context;
46         mAdapter = new ArrayAdapter<String>(mContext,
47                 android.R.layout.simple_spinner_dropdown_item);
48 
49         mSpinner = new Spinner(mContext);
50 
51         mSpinner.setVisibility(View.INVISIBLE);
52         mSpinner.setAdapter(mAdapter);
53         mSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
54             @Override
55             public void onItemSelected(AdapterView<?> parent, View v, int position, long id) {
56                 setSelectedItem(position);
57             }
58 
59             @Override
60             public void onNothingSelected(AdapterView<?> parent) {
61                 // noop
62             }
63         });
64         setPersistent(false);
65         setOnPreferenceClickListener(new OnPreferenceClickListener() {
66             @Override
67             public boolean onPreferenceClick(Preference preference) {
68                 mSpinner.performClick();
69                 return true;
70             }
71         });
72     }
73 
setDropDownWidth(int dimenResId)74     public void setDropDownWidth(int dimenResId) {
75         mSpinner.setDropDownWidth(mContext.getResources().getDimensionPixelSize(dimenResId));
76     }
77 
setCallback(Callback callback)78     public void setCallback(Callback callback) {
79         mCallback = callback;
80     }
81 
setSelectedItem(int position)82     public void setSelectedItem(int position) {
83         final Object value = mValues.get(position);
84         if (mCallback != null && !mCallback.onItemSelected(position, value)) {
85             return;
86         }
87         mSpinner.setSelection(position);
88         setSummary(mAdapter.getItem(position));
89         final boolean disableDependents = value == null;
90         notifyDependencyChange(disableDependents);
91     }
92 
setSelectedValue(Object value)93     public void setSelectedValue(Object value) {
94         final int i = mValues.indexOf(value);
95         if (i > -1) {
96             setSelectedItem(i);
97         }
98     }
99 
addItem(int captionResid, Object value)100     public void addItem(int captionResid, Object value) {
101         addItem(mContext.getResources().getString(captionResid), value);
102     }
103 
addItem(String caption, Object value)104     public void addItem(String caption, Object value) {
105         mAdapter.add(caption);
106         mValues.add(value);
107     }
108 
clearItems()109     public void clearItems(){
110         mAdapter.clear();
111         mValues.clear();
112     }
113 
114     @Override
onBindView(View view)115     protected void onBindView(View view) {
116         super.onBindView(view);
117         if (view.equals(mSpinner.getParent())) return;
118         if (mSpinner.getParent() != null) {
119             ((ViewGroup)mSpinner.getParent()).removeView(mSpinner);
120         }
121         final ViewGroup vg = (ViewGroup)view;
122         vg.addView(mSpinner, 0);
123         final ViewGroup.LayoutParams lp = mSpinner.getLayoutParams();
124         lp.width = 0;
125         mSpinner.setLayoutParams(lp);
126     }
127 
128     public interface Callback {
onItemSelected(int pos, Object value)129         boolean onItemSelected(int pos, Object value);
130     }
131 }
132