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.deskclock
18 
19 import android.content.Context
20 import android.util.AttributeSet
21 import android.widget.FrameLayout
22 
23 import kotlin.math.min
24 
25 /**
26  * A container that frames a timer circle of some sort. The circle is allowed to grow naturally
27  * according to its layout constraints up to the [largest][R.dimen.max_timer_circle_size]
28  * allowable size.
29  */
30 class TimerCircleFrameLayout : FrameLayout {
31     constructor(context: Context) : super(context)
32 
33     constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)
34 
35     constructor(
36         context: Context,
37         attrs: AttributeSet?,
38         defStyleAttr: Int
39     ) : super(context, attrs, defStyleAttr)
40 
41     /**
42      * Note: this method assumes the parent container will specify [exact][MeasureSpec.EXACTLY]
43      * width and height values.
44      *
45      * @param widthMeasureSpec horizontal space requirements as imposed by the parent
46      * @param heightMeasureSpec vertical space requirements as imposed by the parent
47      */
onMeasurenull48     override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
49         var variableWidthMeasureSpec = widthMeasureSpec
50         var variableHeightMeasureSpec = heightMeasureSpec
51         val paddingLeft = paddingLeft
52         val paddingRight = paddingRight
53 
54         val paddingTop = paddingTop
55         val paddingBottom = paddingBottom
56 
57         // Fetch the exact sizes imposed by the parent container.
58         val width = MeasureSpec.getSize(variableWidthMeasureSpec) - paddingLeft - paddingRight
59         val height = MeasureSpec.getSize(variableHeightMeasureSpec) - paddingTop - paddingBottom
60         val smallestDimension = min(width, height)
61 
62         // Fetch the absolute maximum circle size allowed.
63         val maxSize = resources.getDimensionPixelSize(R.dimen.max_timer_circle_size)
64         val size = min(smallestDimension, maxSize)
65 
66         // Set the size of this container.
67         variableWidthMeasureSpec = MeasureSpec.makeMeasureSpec(size + paddingLeft + paddingRight,
68                 MeasureSpec.EXACTLY)
69         variableHeightMeasureSpec = MeasureSpec.makeMeasureSpec(size + paddingTop + paddingBottom,
70                 MeasureSpec.EXACTLY)
71 
72         super.onMeasure(variableWidthMeasureSpec, variableHeightMeasureSpec)
73     }
74 }