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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.app.ActionBar;
     20 import android.app.Activity;
     21 import android.content.Intent;
     22 import android.graphics.Color;
     23 import android.graphics.drawable.ColorDrawable;
     24 import android.os.Bundle;
     25 import android.preference.Preference;
     26 import android.preference.PreferenceActivity;
     27 import android.preference.PreferenceScreen;
     28 import android.view.Gravity;
     29 import android.view.Menu;
     30 import android.view.MenuInflater;
     31 import android.view.MenuItem;
     32 import android.view.View;
     33 import android.view.accessibility.AccessibilityEvent;
     34 import android.view.accessibility.AccessibilityManager;
     35 import android.widget.TextView;
     36 
     37 import com.android.settings.R;
     38 import com.android.settings.SettingsPreferenceFragment;
     39 
     40 public abstract class ToggleFeaturePreferenceFragment
     41         extends SettingsPreferenceFragment {
     42 
     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                 TextView summaryView = (TextView) view.findViewById(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         onInstallActionBarToggleSwitch();
     90         onProcessArguments(getArguments());
     91         // Set a transparent drawable to prevent use of the default one.
     92         getListView().setSelector(new ColorDrawable(Color.TRANSPARENT));
     93         getListView().setDivider(null);
     94     }
     95 
     96     @Override
     97     public void onDestroyView() {
     98         getActivity().getActionBar().setCustomView(null);
     99         mToggleSwitch.setOnBeforeCheckedChangeListener(null);
    100         super.onDestroyView();
    101     }
    102 
    103     protected abstract void onPreferenceToggled(String preferenceKey, boolean enabled);
    104 
    105     @Override
    106     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    107         super.onCreateOptionsMenu(menu, inflater);
    108         MenuItem menuItem = menu.add(mSettingsTitle);
    109         menuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
    110         menuItem.setIntent(mSettingsIntent);
    111     }
    112 
    113     protected void onInstallActionBarToggleSwitch() {
    114         mToggleSwitch = createAndAddActionBarToggleSwitch(getActivity());
    115     }
    116 
    117     private ToggleSwitch createAndAddActionBarToggleSwitch(Activity activity) {
    118         ToggleSwitch toggleSwitch = new ToggleSwitch(activity);
    119         final int padding = activity.getResources().getDimensionPixelSize(
    120                 R.dimen.action_bar_switch_padding);
    121         toggleSwitch.setPaddingRelative(0, 0, padding, 0);
    122         activity.getActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM,
    123                 ActionBar.DISPLAY_SHOW_CUSTOM);
    124         activity.getActionBar().setCustomView(toggleSwitch,
    125                 new ActionBar.LayoutParams(ActionBar.LayoutParams.WRAP_CONTENT,
    126                         ActionBar.LayoutParams.WRAP_CONTENT,
    127                                 Gravity.CENTER_VERTICAL | Gravity.END));
    128         return toggleSwitch;
    129     }
    130 
    131     protected void onProcessArguments(Bundle arguments) {
    132         // Key.
    133         mPreferenceKey = arguments.getString(AccessibilitySettings.EXTRA_PREFERENCE_KEY);
    134         // Enabled.
    135         final boolean enabled = arguments.getBoolean(AccessibilitySettings.EXTRA_CHECKED);
    136         mToggleSwitch.setCheckedInternal(enabled);
    137         // Title.
    138         PreferenceActivity activity = (PreferenceActivity) getActivity();
    139         if (!activity.onIsMultiPane() || activity.onIsHidingHeaders()) {
    140             String title = arguments.getString(AccessibilitySettings.EXTRA_TITLE);
    141             getActivity().setTitle(title);
    142         }
    143         // Summary.
    144         CharSequence summary = arguments.getCharSequence(AccessibilitySettings.EXTRA_SUMMARY);
    145         mSummaryPreference.setSummary(summary);
    146     }
    147 }
    148