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
17package com.android.settings.accessibility;
18
19import android.app.ActionBar;
20import android.app.Activity;
21import android.content.Intent;
22import android.graphics.Color;
23import android.graphics.drawable.ColorDrawable;
24import android.os.Bundle;
25import android.preference.Preference;
26import android.preference.PreferenceActivity;
27import android.preference.PreferenceScreen;
28import android.view.Gravity;
29import android.view.Menu;
30import android.view.MenuInflater;
31import android.view.MenuItem;
32import android.view.View;
33import android.view.accessibility.AccessibilityEvent;
34import android.view.accessibility.AccessibilityManager;
35import android.widget.TextView;
36
37import com.android.settings.R;
38import com.android.settings.SettingsPreferenceFragment;
39
40public 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