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      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 
     39     public DropDownPreference(Context context) {
     40         this(context, null);
     41     }
     42 
     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 
     74     public void setDropDownWidth(int dimenResId) {
     75         mSpinner.setDropDownWidth(mContext.getResources().getDimensionPixelSize(dimenResId));
     76     }
     77 
     78     public void setCallback(Callback callback) {
     79         mCallback = callback;
     80     }
     81 
     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 
     93     public void setSelectedValue(Object value) {
     94         final int i = mValues.indexOf(value);
     95         if (i > -1) {
     96             setSelectedItem(i);
     97         }
     98     }
     99 
    100     public void addItem(int captionResid, Object value) {
    101         addItem(mContext.getResources().getString(captionResid), value);
    102     }
    103 
    104     public void addItem(String caption, Object value) {
    105         mAdapter.add(caption);
    106         mValues.add(value);
    107     }
    108 
    109     public void clearItems(){
    110         mAdapter.clear();
    111         mValues.clear();
    112     }
    113 
    114     @Override
    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 {
    129         boolean onItemSelected(int pos, Object value);
    130     }
    131 }
    132