1 /*
2  * Copyright (C) 2015 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.tv.guide;
18 
19 import java.util.concurrent.TimeUnit;
20 
21 public class GuideUtils {
22     private static int sWidthPerHour = 0;
23 
24     /**
25      * Sets the width in pixels that corresponds to an hour in program guide.
26      * Assume that this is called from main thread only, so, no synchronization.
27      */
setWidthPerHour(int widthPerHour)28     public static void setWidthPerHour(int widthPerHour) {
29         sWidthPerHour = widthPerHour;
30     }
31 
32     /**
33      * Gets the number of pixels in program guide table that corresponds to the given milliseconds.
34      */
convertMillisToPixel(long millis)35     public static int convertMillisToPixel(long millis) {
36         return (int) (millis * sWidthPerHour / TimeUnit.HOURS.toMillis(1));
37     }
38 
39     /**
40      * Gets the number of pixels in program guide table that corresponds to the given range.
41      */
convertMillisToPixel(long startMillis, long endMillis)42     public static int convertMillisToPixel(long startMillis, long endMillis) {
43         // Convert to pixels first to avoid accumulation of rounding errors.
44         return GuideUtils.convertMillisToPixel(endMillis)
45                 - GuideUtils.convertMillisToPixel(startMillis);
46     }
47 
48     /**
49      * Gets the time in millis that corresponds to the given pixels in the program guide.
50      */
convertPixelToMillis(int pixel)51     public static long convertPixelToMillis(int pixel) {
52         return pixel * TimeUnit.HOURS.toMillis(1) / sWidthPerHour;
53     }
54 
GuideUtils()55     private GuideUtils() { }
56 }
57