1 /*
2  * Copyright (C) 2012 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.dialer.util;
18 
19 import android.content.ContentResolver;
20 import android.content.Context;
21 import android.graphics.Paint;
22 import android.os.PowerManager;
23 import android.provider.Settings;
24 import android.provider.Settings.Global;
25 import android.support.annotation.NonNull;
26 import android.text.TextUtils;
27 import android.util.TypedValue;
28 import android.view.View;
29 import android.view.ViewGroup;
30 import android.view.ViewTreeObserver.OnGlobalLayoutListener;
31 import android.view.ViewTreeObserver.OnPreDrawListener;
32 import android.widget.TextView;
33 import java.util.Locale;
34 
35 /** Provides static functions to work with views */
36 public class ViewUtil {
37 
ViewUtil()38   private ViewUtil() {}
39 
40   /** Similar to {@link Runnable} but takes a View parameter to operate on */
41   public interface ViewRunnable {
run(@onNull View view)42     void run(@NonNull View view);
43   }
44 
45   /**
46    * Returns the width as specified in the LayoutParams
47    *
48    * @throws IllegalStateException Thrown if the view's width is unknown before a layout pass s
49    */
getConstantPreLayoutWidth(View view)50   public static int getConstantPreLayoutWidth(View view) {
51     // We haven't been layed out yet, so get the size from the LayoutParams
52     final ViewGroup.LayoutParams p = view.getLayoutParams();
53     if (p.width < 0) {
54       throw new IllegalStateException(
55           "Expecting view's width to be a constant rather " + "than a result of the layout pass");
56     }
57     return p.width;
58   }
59 
60   /**
61    * Returns a boolean indicating whether or not the view's layout direction is RTL
62    *
63    * @param view - A valid view
64    * @return True if the view's layout direction is RTL
65    */
isViewLayoutRtl(View view)66   public static boolean isViewLayoutRtl(View view) {
67     return view.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL;
68   }
69 
isRtl()70   public static boolean isRtl() {
71     return TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()) == View.LAYOUT_DIRECTION_RTL;
72   }
73 
resizeText(TextView textView, int originalTextSize, int minTextSize)74   public static void resizeText(TextView textView, int originalTextSize, int minTextSize) {
75     final Paint paint = textView.getPaint();
76     final int width = textView.getWidth();
77     if (width == 0) {
78       return;
79     }
80     textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, originalTextSize);
81     float ratio = width / paint.measureText(textView.getText().toString());
82     if (ratio <= 1.0f) {
83       textView.setTextSize(
84           TypedValue.COMPLEX_UNIT_PX, Math.max(minTextSize, originalTextSize * ratio));
85     }
86   }
87 
88   /** Runs a piece of code just before the next draw, after layout and measurement */
doOnPreDraw( @onNull final View view, final boolean drawNextFrame, final Runnable runnable)89   public static void doOnPreDraw(
90       @NonNull final View view, final boolean drawNextFrame, final Runnable runnable) {
91     view.getViewTreeObserver()
92         .addOnPreDrawListener(
93             new OnPreDrawListener() {
94               @Override
95               public boolean onPreDraw() {
96                 view.getViewTreeObserver().removeOnPreDrawListener(this);
97                 runnable.run();
98                 return drawNextFrame;
99               }
100             });
101   }
102 
doOnPreDraw( @onNull final View view, final boolean drawNextFrame, final ViewRunnable runnable)103   public static void doOnPreDraw(
104       @NonNull final View view, final boolean drawNextFrame, final ViewRunnable runnable) {
105     view.getViewTreeObserver()
106         .addOnPreDrawListener(
107             new OnPreDrawListener() {
108               @Override
109               public boolean onPreDraw() {
110                 view.getViewTreeObserver().removeOnPreDrawListener(this);
111                 runnable.run(view);
112                 return drawNextFrame;
113               }
114             });
115   }
116 
doOnGlobalLayout(@onNull final View view, final ViewRunnable runnable)117   public static void doOnGlobalLayout(@NonNull final View view, final ViewRunnable runnable) {
118     view.getViewTreeObserver()
119         .addOnGlobalLayoutListener(
120             new OnGlobalLayoutListener() {
121               @Override
122               public void onGlobalLayout() {
123                 view.getViewTreeObserver().removeOnGlobalLayoutListener(this);
124                 runnable.run(view);
125               }
126             });
127   }
128 
129   /**
130    * Returns {@code true} if animations should be disabled.
131    *
132    * <p>Animations should be disabled if {@link
133    * android.provider.Settings.Global#ANIMATOR_DURATION_SCALE} is set to 0 through system settings
134    * or the device is in power save mode.
135    */
areAnimationsDisabled(Context context)136   public static boolean areAnimationsDisabled(Context context) {
137     ContentResolver contentResolver = context.getContentResolver();
138     PowerManager powerManager = context.getSystemService(PowerManager.class);
139     return Settings.Global.getFloat(contentResolver, Global.ANIMATOR_DURATION_SCALE, 1.0f) == 0
140         || powerManager.isPowerSaveMode();
141   }
142 }
143