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 com.android.systemui.util
18 
19 import android.content.res.TypedArray
20 import android.graphics.Color
21 import android.view.ContextThemeWrapper
22 import androidx.annotation.ColorInt
23 
24 /** Returns an ARGB color version of [color] at the given [alpha]. */
25 fun getColorWithAlpha(color: Int, alpha: Float): Int =
26     Color.argb(
27         (alpha * 255).toInt(),
28         Color.red(color),
29         Color.green(color),
30         Color.blue(color)
31     )
32 
33 
34 /**
35  * Returns the color provided at the specified {@param attrIndex} in {@param a} if it exists,
36  * otherwise, returns the color from the private attribute {@param privAttrId}.
37  */
38 fun getPrivateAttrColorIfUnset(
39     ctw: ContextThemeWrapper,
40     attrArray: TypedArray,
41     attrIndex: Int,
42     defColor: Int,
43     privAttrId: Int
44 ): Int {
45     // If the index is specified, use that value
46     var a = attrArray
47     if (a.hasValue(attrIndex)) {
48         return a.getColor(attrIndex, defColor)
49     }
50 
51     // Otherwise fallback to the value of the private attribute
52     val customAttrs = intArrayOf(privAttrId)
53     a = ctw.obtainStyledAttributes(customAttrs)
54     val color = a.getColor(0, defColor)
55     a.recycle()
56     return color
57 }
58 
59 /** Returns the color as a HTML hex color (or null) */
60 fun hexColorString(@ColorInt color: Int?): String = color
61     ?.let { String.format("#%08x", it) }
62     ?: "null"
63