1 /*
2  * Copyright (C) 2023 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 static com.android.settings.accessibility.FlashNotificationsUtil.ACTION_FLASH_NOTIFICATION_START_PREVIEW;
20 import static com.android.settings.accessibility.FlashNotificationsUtil.ACTION_FLASH_NOTIFICATION_STOP_PREVIEW;
21 import static com.android.settings.accessibility.FlashNotificationsUtil.DEFAULT_SCREEN_FLASH_COLOR;
22 import static com.android.settings.accessibility.FlashNotificationsUtil.EXTRA_FLASH_NOTIFICATION_PREVIEW_COLOR;
23 import static com.android.settings.accessibility.FlashNotificationsUtil.EXTRA_FLASH_NOTIFICATION_PREVIEW_TYPE;
24 import static com.android.settings.accessibility.FlashNotificationsUtil.TYPE_LONG_PREVIEW;
25 
26 import android.app.Dialog;
27 import android.content.Intent;
28 import android.graphics.Color;
29 import android.os.Bundle;
30 import android.os.UserHandle;
31 import android.view.View;
32 
33 import androidx.annotation.ColorInt;
34 import androidx.annotation.NonNull;
35 import androidx.annotation.Nullable;
36 import androidx.appcompat.app.AlertDialog;
37 import androidx.fragment.app.DialogFragment;
38 
39 import com.android.settings.R;
40 
41 import java.util.Timer;
42 import java.util.TimerTask;
43 import java.util.function.Consumer;
44 
45 
46 /**
47  * DialogFragment for Screen flash notification color picker.
48  */
49 public class ScreenFlashNotificationColorDialogFragment extends DialogFragment implements
50         ColorSelectorLayout.OnCheckedChangeListener {
51 
52     private static final int PREVIEW_LONG_TIME_MS = 5000;
53     private static final int BETWEEN_STOP_AND_START_DELAY_MS = 250;
54     private static final int MARGIN_FOR_STOP_DELAY_MS = 100;
55 
56     @ColorInt
57     private int mCurrentColor = Color.TRANSPARENT;
58     private Consumer<Integer> mConsumer;
59 
60     private Timer mTimer = null;
61     private Boolean mIsPreview = false;
62 
getInstance(int initialColor, Consumer<Integer> colorConsumer)63     static ScreenFlashNotificationColorDialogFragment getInstance(int initialColor,
64             Consumer<Integer> colorConsumer) {
65         final ScreenFlashNotificationColorDialogFragment result =
66                 new ScreenFlashNotificationColorDialogFragment();
67         result.mCurrentColor = initialColor;
68         result.mConsumer = colorConsumer != null ? colorConsumer : i -> {
69         };
70         return result;
71     }
72 
73     @NonNull
74     @Override
onCreateDialog(@ullable Bundle savedInstanceState)75     public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
76         final View dialogView = getLayoutInflater().inflate(R.layout.layout_color_selector_dialog,
77                 null);
78 
79         final ColorSelectorLayout colorSelectorLayout = dialogView.findViewById(
80                 R.id.color_selector_preference);
81         if (colorSelectorLayout != null) {
82             colorSelectorLayout.setOnCheckedChangeListener(this);
83             colorSelectorLayout.setCheckedColor(mCurrentColor);
84         }
85 
86         final AlertDialog createdDialog = new AlertDialog.Builder(getContext())
87                 .setView(dialogView)
88                 .setTitle(R.string.screen_flash_notification_color_title)
89                 .setNeutralButton(R.string.flash_notifications_preview, null)
90                 .setNegativeButton(R.string.color_selector_dialog_cancel, (dialog, which) -> {
91                 })
92                 .setPositiveButton(R.string.color_selector_dialog_done, (dialog, which) -> {
93                     mCurrentColor = colorSelectorLayout.getCheckedColor(DEFAULT_SCREEN_FLASH_COLOR);
94                     mConsumer.accept(mCurrentColor);
95                 })
96                 .create();
97         createdDialog.setOnShowListener(
98                 dialogInterface -> createdDialog.getButton(AlertDialog.BUTTON_NEUTRAL)
99                         .setOnClickListener(v -> showColor()));
100 
101         return createdDialog;
102     }
103 
104     @Override
onPause()105     public void onPause() {
106         super.onPause();
107         cancelPreviewTask();
108     }
109 
110     @Override
onCheckedChanged(ColorSelectorLayout group)111     public void onCheckedChanged(ColorSelectorLayout group) {
112         mCurrentColor = group.getCheckedColor(DEFAULT_SCREEN_FLASH_COLOR);
113         if (mIsPreview) {
114             showColor();
115         }
116     }
117 
showColor()118     private void showColor() {
119         int startDelay = 0;
120 
121         synchronized (this) {
122             if (mTimer != null) mTimer.cancel();
123 
124             mTimer = createTimer();
125             if (mIsPreview) {
126                 mTimer.schedule(getStopTask(), 0);
127                 startDelay = BETWEEN_STOP_AND_START_DELAY_MS;
128             }
129             mTimer.schedule(getStartTask(), startDelay);
130             mTimer.schedule(getStopTask(),
131                     startDelay + PREVIEW_LONG_TIME_MS + MARGIN_FOR_STOP_DELAY_MS);
132         }
133     }
134 
getStartTask()135     private TimerTask getStartTask() {
136         return new TimerTask() {
137             @Override
138             public void run() {
139                 synchronized (this) {
140                     startPreviewLocked();
141                 }
142             }
143         };
144     }
145 
146     private TimerTask getStopTask() {
147         return new TimerTask() {
148             @Override
149             public void run() {
150                 synchronized (this) {
151                     stopPreviewLocked();
152                 }
153             }
154         };
155     }
156 
157     private void cancelPreviewTask() {
158         synchronized (this) {
159             if (mTimer != null) mTimer.cancel();
160             stopPreviewLocked();
161         }
162     }
163 
164     private void startPreviewLocked() {
165         if (getContext() == null) return;
166 
167         mIsPreview = true;
168         Intent intent = new Intent(ACTION_FLASH_NOTIFICATION_START_PREVIEW);
169         intent.putExtra(EXTRA_FLASH_NOTIFICATION_PREVIEW_TYPE, TYPE_LONG_PREVIEW);
170         intent.putExtra(EXTRA_FLASH_NOTIFICATION_PREVIEW_COLOR, mCurrentColor);
171         getContext().sendBroadcastAsUser(intent, UserHandle.SYSTEM);
172     }
173 
174     private void stopPreviewLocked() {
175         if (getContext() == null) return;
176 
177         Intent stopIntent = new Intent(ACTION_FLASH_NOTIFICATION_STOP_PREVIEW);
178         getContext().sendBroadcastAsUser(stopIntent, UserHandle.SYSTEM);
179         mIsPreview = false;
180     }
181 
182     Timer createTimer() {
183         return new Timer();
184     }
185 }
186