1 /*
2  * Copyright (C) 2019 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.keyguard.clock;
18 
19 import android.content.res.Resources;
20 import android.util.MathUtils;
21 
22 import com.android.internal.annotations.VisibleForTesting;
23 
24 /**
25  * Computes preferred position of clock by considering height of status bar and lock icon.
26  */
27 class SmallClockPosition {
28 
29     /**
30      * Dimensions used to determine preferred clock position.
31      */
32     private final int mStatusBarHeight;
33     private final int mKeyguardLockPadding;
34     private final int mKeyguardLockHeight;
35     private final int mBurnInOffsetY;
36 
37     /**
38      * Amount of transition between AOD and lock screen.
39      */
40     private float mDarkAmount;
41 
SmallClockPosition(Resources res)42     SmallClockPosition(Resources res) {
43         this(res.getDimensionPixelSize(com.android.keyguard.R.dimen.status_bar_height),
44                 res.getDimensionPixelSize(com.android.keyguard.R.dimen.keyguard_lock_padding),
45                 res.getDimensionPixelSize(com.android.keyguard.R.dimen.keyguard_lock_height),
46                 res.getDimensionPixelSize(com.android.keyguard.R.dimen.burn_in_prevention_offset_y)
47         );
48     }
49 
50     @VisibleForTesting
SmallClockPosition(int statusBarHeight, int lockPadding, int lockHeight, int burnInY)51     SmallClockPosition(int statusBarHeight, int lockPadding, int lockHeight, int burnInY) {
52         mStatusBarHeight = statusBarHeight;
53         mKeyguardLockPadding = lockPadding;
54         mKeyguardLockHeight = lockHeight;
55         mBurnInOffsetY = burnInY;
56     }
57 
58     /**
59      * See {@link ClockPlugin#setDarkAmount}.
60      */
setDarkAmount(float darkAmount)61     void setDarkAmount(float darkAmount) {
62         mDarkAmount = darkAmount;
63     }
64 
65     /**
66      * Gets the preferred Y position accounting for status bar and lock icon heights.
67      */
getPreferredY()68     int getPreferredY() {
69         // On AOD, clock needs to appear below the status bar with enough room for pixel shifting
70         int aodY = mStatusBarHeight + mKeyguardLockPadding + mBurnInOffsetY;
71         // On lock screen, clock needs to appear below the lock icon
72         int lockY =  mStatusBarHeight + mKeyguardLockHeight + 2 * mKeyguardLockPadding;
73         return (int) MathUtils.lerp(lockY, aodY, mDarkAmount);
74     }
75 }
76