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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.graphics.Color;
     21 import android.graphics.drawable.ColorDrawable;
     22 import android.os.Bundle;
     23 import android.preference.Preference;
     24 import android.preference.PreferenceScreen;
     25 import android.view.Menu;
     26 import android.view.MenuInflater;
     27 import android.view.MenuItem;
     28 import android.view.View;
     29 import android.view.accessibility.AccessibilityEvent;
     30 import android.view.accessibility.AccessibilityManager;
     31 import android.widget.TextView;
     32 
     33 import com.android.settings.R;
     34 import com.android.settings.SettingsActivity;
     35 import com.android.settings.SettingsPreferenceFragment;
     36 import com.android.settings.widget.SwitchBar;
     37 import com.android.settings.widget.ToggleSwitch;
     38 
     39 public abstract class ToggleFeaturePreferenceFragment
     40         extends SettingsPreferenceFragment {
     41 
     42     protected SwitchBar mSwitchBar;
     43     protected ToggleSwitch mToggleSwitch;
     44 
     45     protected String mPreferenceKey;
     46     protected Preference mSummaryPreference;
     47 
     48     protected CharSequence mSettingsTitle;
     49     protected Intent mSettingsIntent;
     50 
     51     @Override
     52     public void onCreate(Bundle savedInstanceState) {
     53         super.onCreate(savedInstanceState);
     54         PreferenceScreen preferenceScreen = getPreferenceManager().createPreferenceScreen(
     55                 getActivity());
     56         setPreferenceScreen(preferenceScreen);
     57         mSummaryPreference = new Preference(getActivity()) {
     58             @Override
     59             protected void onBindView(View view) {
     60                 super.onBindView(view);
     61                 final TextView summaryView = (TextView) view.findViewById(android.R.id.summary);
     62                 summaryView.setText(getSummary());
     63                 sendAccessibilityEvent(summaryView);
     64             }
     65 
     66             private void sendAccessibilityEvent(View view) {
     67                 // Since the view is still not attached we create, populate,
     68                 // and send the event directly since we do not know when it
     69                 // will be attached and posting commands is not as clean.
     70                 AccessibilityManager accessibilityManager =
     71                         AccessibilityManager.getInstance(getActivity());
     72                 if (accessibilityManager.isEnabled()) {
     73                     AccessibilityEvent event = AccessibilityEvent.obtain();
     74                     event.setEventType(AccessibilityEvent.TYPE_VIEW_FOCUSED);
     75                     view.onInitializeAccessibilityEvent(event);
     76                     view.dispatchPopulateAccessibilityEvent(event);
     77                     accessibilityManager.sendAccessibilityEvent(event);
     78                 }
     79             }
     80         };
     81         mSummaryPreference.setPersistent(false);
     82         mSummaryPreference.setLayoutResource(R.layout.text_description_preference);
     83         preferenceScreen.addPreference(mSummaryPreference);
     84     }
     85 
     86     @Override
     87     public void onViewCreated(View view, Bundle savedInstanceState) {
     88         super.onViewCreated(view, savedInstanceState);
     89 
     90         SettingsActivity activity = (SettingsActivity) getActivity();
     91         mSwitchBar = activity.getSwitchBar();
     92         mToggleSwitch = mSwitchBar.getSwitch();
     93 
     94         onProcessArguments(getArguments());
     95     }
     96 
     97     @Override
     98     public void onActivityCreated(Bundle savedInstanceState) {
     99         super.onActivityCreated(savedInstanceState);
    100 
    101         installActionBarToggleSwitch();
    102     }
    103 
    104     @Override
    105     public void onDestroyView() {
    106         super.onDestroyView();
    107 
    108         removeActionBarToggleSwitch();
    109     }
    110 
    111     protected abstract void onPreferenceToggled(String preferenceKey, boolean enabled);
    112 
    113     @Override
    114     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    115         super.onCreateOptionsMenu(menu, inflater);
    116         MenuItem menuItem = menu.add(mSettingsTitle);
    117         menuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
    118         menuItem.setIntent(mSettingsIntent);
    119     }
    120 
    121     protected void onInstallSwitchBarToggleSwitch() {
    122         // Implement this to set a checked listener.
    123     }
    124 
    125     protected void onRemoveSwitchBarToggleSwitch() {
    126         // Implement this to reset a checked listener.
    127     }
    128 
    129     private void installActionBarToggleSwitch() {
    130         mSwitchBar.show();
    131         onInstallSwitchBarToggleSwitch();
    132     }
    133 
    134     private void removeActionBarToggleSwitch() {
    135         mToggleSwitch.setOnBeforeCheckedChangeListener(null);
    136         onRemoveSwitchBarToggleSwitch();
    137         mSwitchBar.hide();
    138     }
    139 
    140     public void setTitle(String title) {
    141         getActivity().setTitle(title);
    142     }
    143 
    144     protected void onProcessArguments(Bundle arguments) {
    145         if (arguments == null) {
    146             getPreferenceScreen().removePreference(mSummaryPreference);
    147             return;
    148         }
    149 
    150         // Key.
    151         mPreferenceKey = arguments.getString(AccessibilitySettings.EXTRA_PREFERENCE_KEY);
    152 
    153         // Enabled.
    154         if (arguments.containsKey(AccessibilitySettings.EXTRA_CHECKED)) {
    155             final boolean enabled = arguments.getBoolean(AccessibilitySettings.EXTRA_CHECKED);
    156             mSwitchBar.setCheckedInternal(enabled);
    157         }
    158 
    159         // Title.
    160         if (arguments.containsKey(AccessibilitySettings.EXTRA_TITLE)) {
    161             setTitle(arguments.getString(AccessibilitySettings.EXTRA_TITLE));
    162         }
    163 
    164         // Summary.
    165         if (arguments.containsKey(AccessibilitySettings.EXTRA_SUMMARY)) {
    166             final CharSequence summary = arguments.getCharSequence(
    167                     AccessibilitySettings.EXTRA_SUMMARY);
    168             mSummaryPreference.setSummary(summary);
    169 
    170             // Set a transparent drawable to prevent use of the default one.
    171             getListView().setSelector(new ColorDrawable(Color.TRANSPARENT));
    172             getListView().setDivider(null);
    173         } else {
    174             getPreferenceScreen().removePreference(mSummaryPreference);
    175         }
    176     }
    177 }
    178