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.Context;
20 import android.util.MathUtils;
21 
22 import com.android.internal.annotations.VisibleForTesting;
23 import com.android.internal.policy.SystemBarUtils;
24 import com.android.systemui.R;
25 
26 /**
27  * Computes preferred position of clock by considering height of status bar and lock icon.
28  */
29 class SmallClockPosition {
30 
31     /**
32      * Dimensions used to determine preferred clock position.
33      */
34     private final int mStatusBarHeight;
35     private final int mKeyguardLockPadding;
36     private final int mKeyguardLockHeight;
37     private final int mBurnInOffsetY;
38 
39     /**
40      * Amount of transition between AOD and lock screen.
41      */
42     private float mDarkAmount;
43 
SmallClockPosition(Context context)44     SmallClockPosition(Context context) {
45         this(SystemBarUtils.getStatusBarHeight(context),
46                 context.getResources().getDimensionPixelSize(R.dimen.keyguard_lock_padding),
47                 context.getResources().getDimensionPixelSize(R.dimen.keyguard_lock_height),
48                 context.getResources().getDimensionPixelSize(R.dimen.burn_in_prevention_offset_y)
49         );
50     }
51 
52     @VisibleForTesting
SmallClockPosition(int statusBarHeight, int lockPadding, int lockHeight, int burnInY)53     SmallClockPosition(int statusBarHeight, int lockPadding, int lockHeight, int burnInY) {
54         mStatusBarHeight = statusBarHeight;
55         mKeyguardLockPadding = lockPadding;
56         mKeyguardLockHeight = lockHeight;
57         mBurnInOffsetY = burnInY;
58     }
59 
60     /**
61      * See {@link ClockPlugin#setDarkAmount}.
62      */
setDarkAmount(float darkAmount)63     void setDarkAmount(float darkAmount) {
64         mDarkAmount = darkAmount;
65     }
66 
67     /**
68      * Gets the preferred Y position accounting for status bar and lock icon heights.
69      */
getPreferredY()70     int getPreferredY() {
71         // On AOD, clock needs to appear below the status bar with enough room for pixel shifting
72         int aodY = mStatusBarHeight + mKeyguardLockHeight + 2 * mKeyguardLockPadding
73                 + mBurnInOffsetY;
74         // On lock screen, clock needs to appear below the lock icon
75         int lockY =  mStatusBarHeight + mKeyguardLockHeight + 2 * mKeyguardLockPadding;
76         return (int) MathUtils.lerp(lockY, aodY, mDarkAmount);
77     }
78 }
79