1 /*
2  * Copyright (C) 2020 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.systemui.util
18 
19 import android.content.Context
20 import android.util.AttributeSet
21 import android.widget.LinearLayout
22 
23 /**
24  * Basically a normal linear layout but doesn't grow its children with weight 1 even when its
25  * measured with exactly.
26  */
27 class NeverExactlyLinearLayout @JvmOverloads constructor(
28     context: Context,
29     attrs: AttributeSet? = null,
30     defStyleAttr: Int = 0
31 ) : LinearLayout(context, attrs, defStyleAttr) {
onMeasurenull32     override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
33 
34         val (widthExactly, usedWidthSpec, width) = getNonExactlyMeasureSpec(widthMeasureSpec)
35         val (heightExactly, usedHeightSpec, height) = getNonExactlyMeasureSpec(heightMeasureSpec)
36 
37         super.onMeasure(usedWidthSpec, usedHeightSpec)
38         if (widthExactly || heightExactly) {
39             val newWidth = if (widthExactly) width else measuredWidth
40             val newHeight = if (heightExactly) height else measuredHeight
41             setMeasuredDimension(newWidth, newHeight)
42         }
43     }
44 
45     /**
46      * Obtain a measurespec that's not exactly
47      *
48      * @return a triple, where we return 1. if this was exactly, 2. the new measurespec, 3. the size
49      *         of the measurespec
50      */
getNonExactlyMeasureSpecnull51     private fun getNonExactlyMeasureSpec(measureSpec: Int): Triple<Boolean, Int, Int> {
52         var newSpec = measureSpec
53         val isExactly = MeasureSpec.getMode(measureSpec) == MeasureSpec.EXACTLY
54         val size = MeasureSpec.getSize(measureSpec)
55         if (isExactly) {
56             newSpec = MeasureSpec.makeMeasureSpec(size, MeasureSpec.AT_MOST)
57         }
58         return Triple(isExactly, newSpec, size)
59     }
60 }