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      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 
     38   private ViewUtil() {}
     39 
     40   /** Similar to {@link Runnable} but takes a View parameter to operate on */
     41   public interface ViewRunnable {
     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    */
     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    */
     66   public static boolean isViewLayoutRtl(View view) {
     67     return view.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL;
     68   }
     69 
     70   public static boolean isRtl() {
     71     return TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()) == View.LAYOUT_DIRECTION_RTL;
     72   }
     73 
     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 */
     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 
    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 
    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    */
    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