1 /*
2  * Copyright (C) 2022 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 platform.test.screenshot
18 
19 import android.view.View
20 import android.view.ViewGroup
21 import android.view.WindowInsets
22 
23 /** [Sequence] that yields all of the direct children of this [ViewGroup] */
24 val ViewGroup.children
<lambda>null25     get() = sequence { for (i in 0 until childCount) yield(getChildAt(i)) }
26 
27 /** Returns the total number of child views below this view */
getChildCountRecursivelynull28 fun View.getChildCountRecursively(): Int {
29     return if (this is ViewGroup) {
30         var count = childCount
31         for (i in 0 until childCount) {
32             getChildAt(i)?.let { count += it.getChildCountRecursively() }
33         }
34         count
35     } else {
36         0
37     }
38 }
39 
40 /**
41  * Elevation/shadows is not deterministic when doing hardware rendering, this exentsion allows to
42  * disable it for any view in the hierarchy.
43  */
removeElevationRecursivelynull44 fun View.removeElevationRecursively() {
45     this.elevation = 0f
46     (this as? ViewGroup)?.children?.forEach(View::removeElevationRecursively)
47 }
48 
49 /**
50  * Different devices could have different insets (e.g. different height of the navigation bar or
51  * taskbar). This method dispatches empty insets to the whole view hierarchy and removes the
52  * original listener, so the views won't receive real insets.
53  */
removeInsetsRecursivelynull54 fun View.removeInsetsRecursively() {
55     this.dispatchApplyWindowInsets(WindowInsets.CONSUMED)
56     this.setOnApplyWindowInsetsListener(null)
57     (this as? ViewGroup)?.children?.forEach(View::removeInsetsRecursively)
58 }
59