1 /*
2  * Copyright (C) 2016 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.settings.widget;
18 
19 import android.content.Context;
20 import android.util.AttributeSet;
21 import android.widget.ProgressBar;
22 
23 import com.android.settings.R;
24 
25 /**
26  * A (determinate) progress bar in the form of a ring. The progress bar goes clockwise starting
27  * from the 12 o'clock position. This view maintain equal width and height using a strategy similar
28  * to "centerInside" for ImageView.
29  */
30 public class RingProgressBar extends ProgressBar {
31 
RingProgressBar(Context context)32     public RingProgressBar(Context context) {
33         this(context, null);
34     }
35 
RingProgressBar(Context context, AttributeSet attrs)36     public RingProgressBar(Context context, AttributeSet attrs) {
37         this(context, attrs, 0);
38     }
39 
RingProgressBar(Context context, AttributeSet attrs, int defStyleAttr)40     public RingProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
41         this(context, attrs, defStyleAttr, R.style.RingProgressBarStyle);
42     }
43 
RingProgressBar(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)44     public RingProgressBar(Context context, AttributeSet attrs, int defStyleAttr,
45             int defStyleRes) {
46         super(context, attrs, defStyleAttr, defStyleRes);
47     }
48 
49     @Override
onMeasure(int widthMeasureSpec, int heightMeasureSpec)50     protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
51         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
52         final int measuredHeight = getMeasuredHeight();
53         final int measuredWidth = getMeasuredWidth();
54         final int shortSide = Math.min(measuredHeight, measuredWidth);
55         setMeasuredDimension(shortSide, shortSide);
56     }
57 }
58