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      1 /*
      2  * Copyright (C) 2013 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.accessibility;
     18 
     19 import android.content.Intent;
     20 import android.os.Bundle;
     21 import android.support.v7.preference.Preference;
     22 import android.support.v7.preference.PreferenceScreen;
     23 import android.support.v7.preference.PreferenceViewHolder;
     24 import android.view.Menu;
     25 import android.view.MenuInflater;
     26 import android.view.MenuItem;
     27 import android.view.View;
     28 import android.view.accessibility.AccessibilityEvent;
     29 import android.view.accessibility.AccessibilityManager;
     30 import android.widget.TextView;
     31 
     32 import com.android.settings.R;
     33 import com.android.settings.SettingsActivity;
     34 import com.android.settings.SettingsPreferenceFragment;
     35 import com.android.settings.widget.SwitchBar;
     36 import com.android.settings.widget.ToggleSwitch;
     37 
     38 public abstract class ToggleFeaturePreferenceFragment
     39         extends SettingsPreferenceFragment {
     40 
     41     protected SwitchBar mSwitchBar;
     42     protected ToggleSwitch mToggleSwitch;
     43 
     44     protected String mPreferenceKey;
     45     protected Preference mSummaryPreference;
     46 
     47     protected CharSequence mSettingsTitle;
     48     protected Intent mSettingsIntent;
     49 
     50     @Override
     51     public void onCreate(Bundle savedInstanceState) {
     52         super.onCreate(savedInstanceState);
     53         PreferenceScreen preferenceScreen = getPreferenceManager().createPreferenceScreen(
     54                 getActivity());
     55         setPreferenceScreen(preferenceScreen);
     56         mSummaryPreference = new Preference(getPrefContext()) {
     57             @Override
     58             public void onBindViewHolder(PreferenceViewHolder view) {
     59                 super.onBindViewHolder(view);
     60                 view.setDividerAllowedAbove(false);
     61                 view.setDividerAllowedBelow(false);
     62                 final TextView summaryView = (TextView) view.findViewById(android.R.id.summary);
     63                 summaryView.setText(getSummary());
     64                 sendAccessibilityEvent(summaryView);
     65             }
     66 
     67             private void sendAccessibilityEvent(View view) {
     68                 // Since the view is still not attached we create, populate,
     69                 // and send the event directly since we do not know when it
     70                 // will be attached and posting commands is not as clean.
     71                 AccessibilityManager accessibilityManager =
     72                         AccessibilityManager.getInstance(getActivity());
     73                 if (accessibilityManager.isEnabled()) {
     74                     AccessibilityEvent event = AccessibilityEvent.obtain();
     75                     event.setEventType(AccessibilityEvent.TYPE_VIEW_FOCUSED);
     76                     view.onInitializeAccessibilityEvent(event);
     77                     view.dispatchPopulateAccessibilityEvent(event);
     78                     accessibilityManager.sendAccessibilityEvent(event);
     79                 }
     80             }
     81         };
     82         mSummaryPreference.setSelectable(false);
     83         mSummaryPreference.setPersistent(false);
     84         mSummaryPreference.setLayoutResource(R.layout.text_description_preference);
     85         preferenceScreen.addPreference(mSummaryPreference);
     86     }
     87 
     88     @Override
     89     public void onViewCreated(View view, Bundle savedInstanceState) {
     90         super.onViewCreated(view, savedInstanceState);
     91 
     92         SettingsActivity activity = (SettingsActivity) getActivity();
     93         mSwitchBar = activity.getSwitchBar();
     94         mToggleSwitch = mSwitchBar.getSwitch();
     95 
     96         onProcessArguments(getArguments());
     97     }
     98 
     99     @Override
    100     public void onActivityCreated(Bundle savedInstanceState) {
    101         super.onActivityCreated(savedInstanceState);
    102         installActionBarToggleSwitch();
    103     }
    104 
    105     @Override
    106     public void onDestroyView() {
    107         super.onDestroyView();
    108 
    109         removeActionBarToggleSwitch();
    110     }
    111 
    112     protected abstract void onPreferenceToggled(String preferenceKey, boolean enabled);
    113 
    114     @Override
    115     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    116         super.onCreateOptionsMenu(menu, inflater);
    117         if (mSettingsTitle != null && mSettingsIntent != null) {
    118             MenuItem menuItem = menu.add(mSettingsTitle);
    119             menuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
    120             menuItem.setIntent(mSettingsIntent);
    121         }
    122     }
    123 
    124     protected void onInstallSwitchBarToggleSwitch() {
    125         // Implement this to set a checked listener.
    126     }
    127 
    128     protected void onRemoveSwitchBarToggleSwitch() {
    129         // Implement this to reset a checked listener.
    130     }
    131 
    132     private void installActionBarToggleSwitch() {
    133         mSwitchBar.show();
    134         onInstallSwitchBarToggleSwitch();
    135     }
    136 
    137     private void removeActionBarToggleSwitch() {
    138         mToggleSwitch.setOnBeforeCheckedChangeListener(null);
    139         onRemoveSwitchBarToggleSwitch();
    140         mSwitchBar.hide();
    141     }
    142 
    143     public void setTitle(String title) {
    144         getActivity().setTitle(title);
    145     }
    146 
    147     protected void onProcessArguments(Bundle arguments) {
    148         if (arguments == null) {
    149             getPreferenceScreen().removePreference(mSummaryPreference);
    150             return;
    151         }
    152 
    153         // Key.
    154         mPreferenceKey = arguments.getString(AccessibilitySettings.EXTRA_PREFERENCE_KEY);
    155 
    156         // Enabled.
    157         if (arguments.containsKey(AccessibilitySettings.EXTRA_CHECKED)) {
    158             final boolean enabled = arguments.getBoolean(AccessibilitySettings.EXTRA_CHECKED);
    159             mSwitchBar.setCheckedInternal(enabled);
    160         }
    161 
    162         // Title.
    163         if (arguments.containsKey(AccessibilitySettings.EXTRA_TITLE)) {
    164             setTitle(arguments.getString(AccessibilitySettings.EXTRA_TITLE));
    165         }
    166 
    167         // Summary.
    168         if (arguments.containsKey(AccessibilitySettings.EXTRA_SUMMARY)) {
    169             final CharSequence summary = arguments.getCharSequence(
    170                     AccessibilitySettings.EXTRA_SUMMARY);
    171             mSummaryPreference.setSummary(summary);
    172         } else {
    173             getPreferenceScreen().removePreference(mSummaryPreference);
    174         }
    175     }
    176 }
    177