1 /*
2  * Copyright (C) 2021 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 package com.android.systemui.biometrics
17 
18 import android.content.Context
19 import android.graphics.ColorFilter
20 import android.graphics.Paint
21 import android.graphics.Rect
22 import android.graphics.RectF
23 import android.graphics.drawable.Drawable
24 import android.graphics.drawable.ShapeDrawable
25 import android.graphics.drawable.shapes.PathShape
26 import android.util.PathParser
27 import com.android.systemui.R
28 
29 private const val DEFAULT_STROKE_WIDTH = 3f
30 
31 /**
32  * Abstract base class for drawable displayed when the finger is not touching the
33  * sensor area.
34  */
35 abstract class UdfpsDrawable(
36     protected val context: Context,
37     drawableFactory: (Context) -> ShapeDrawable
38 ) : Drawable() {
39 
40     constructor(context: Context) : this(context, defaultFactory)
41 
42     /** Fingerprint affordance. */
43     val fingerprintDrawable: ShapeDrawable = drawableFactory(context)
44 
45     private var _alpha: Int = 255 // 0 - 255
46 
47     var strokeWidth: Float = fingerprintDrawable.paint.strokeWidth
48         set(value) {
49             field = value
50             fingerprintDrawable.paint.strokeWidth = value
51             invalidateSelf()
52         }
53 
54     var isDisplayConfigured: Boolean = false
55         set(showing) {
56             if (field == showing) {
57                 return
58             }
59             field = showing
60             invalidateSelf()
61         }
62 
63     /** The [sensorRect] coordinates for the sensor area. */
64     open fun onSensorRectUpdated(sensorRect: RectF) {
65         val margin = sensorRect.height().toInt() / 8
66         val bounds = Rect(
67             sensorRect.left.toInt() + margin,
68             sensorRect.top.toInt() + margin,
69             sensorRect.right.toInt() - margin,
70             sensorRect.bottom.toInt() - margin
71         )
72         updateFingerprintIconBounds(bounds)
73     }
74 
75     /** Bounds for the fingerprint icon. */
76     protected open fun updateFingerprintIconBounds(bounds: Rect) {
77         fingerprintDrawable.bounds = bounds
78         invalidateSelf()
79     }
80 
81     override fun getAlpha(): Int = _alpha
82 
83     override fun setAlpha(alpha: Int) {
84         _alpha = alpha
85         fingerprintDrawable.alpha = alpha
86         invalidateSelf()
87     }
88 
89     override fun setColorFilter(colorFilter: ColorFilter?) {}
90 
91     override fun getOpacity(): Int = 0
92 }
93 
94 private val defaultFactory = { context: Context ->
95     val fpPath = context.resources.getString(R.string.config_udfpsIcon)
96     val drawable = ShapeDrawable(
97         PathShape(PathParser.createPathFromPathData(fpPath), 72f, 72f)
98     )
99     drawable.mutate()
100     drawable.paint.style = Paint.Style.STROKE
101     drawable.paint.strokeCap = Paint.Cap.ROUND
102     drawable.paint.strokeWidth = DEFAULT_STROKE_WIDTH
103     drawable
104 }
105