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 
18 package com.android.systemui.keyguard.ui.binder
19 
20 import android.content.res.ColorStateList
21 import android.widget.ImageView
22 import androidx.lifecycle.Lifecycle
23 import androidx.lifecycle.repeatOnLifecycle
24 import com.android.systemui.keyguard.ui.viewmodel.BackgroundViewModel
25 import com.android.systemui.lifecycle.repeatWhenAttached
26 import kotlinx.coroutines.ExperimentalCoroutinesApi
27 import kotlinx.coroutines.launch
28 
29 @ExperimentalCoroutinesApi
30 object UdfpsBackgroundViewBinder {
31 
32     /**
33      * Drives UI for the udfps background view. See [UdfpsAodFingerprintViewBinder] and
34      * [UdfpsFingerprintViewBinder].
35      */
36     @JvmStatic
37     fun bind(
38         view: ImageView,
39         viewModel: BackgroundViewModel,
40     ) {
41         view.alpha = 0f
42         view.repeatWhenAttached {
43             repeatOnLifecycle(Lifecycle.State.STARTED) {
44                 launch {
45                     viewModel.transition.collect {
46                         view.alpha = it.alpha
47                         view.scaleX = it.scale
48                         view.scaleY = it.scale
49                         view.imageTintList = ColorStateList.valueOf(it.color)
50                     }
51                 }
52             }
53         }
54     }
55 }
56