java/com/android/dialer/util/ViewUtil.java

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.dialer.util;

import android.content.ContentResolver;
import android.content.Context;
import android.graphics.Paint;
import android.os.PowerManager;
import android.provider.Settings;
import android.provider.Settings.Global;
import android.support.annotation.NonNull;
import android.text.TextUtils;
import android.util.TypedValue;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.ViewTreeObserver.OnPreDrawListener;
import android.widget.TextView;
import java.util.Locale;

/** Provides static functions to work with views */
public class ViewUtil {

  private ViewUtil() {}

  /** Similar to {@link Runnable} but takes a View parameter to operate on */
  public interface ViewRunnable {
    void run(@NonNull View view);
  }

  /**
   * Returns the width as specified in the LayoutParams
   *
   * @throws IllegalStateException Thrown if the view's width is unknown before a layout pass s
   */
  public static int getConstantPreLayoutWidth(View view) {
    // We haven't been layed out yet, so get the size from the LayoutParams
    final ViewGroup.LayoutParams p = view.getLayoutParams();
    if (p.width < 0) {
      throw new IllegalStateException(
          "Expecting view's width to be a constant rather " + "than a result of the layout pass");
    }
    return p.width;
  }

  /**
   * Returns a boolean indicating whether or not the view's layout direction is RTL
   *
   * @param view - A valid view
   * @return True if the view's layout direction is RTL
   */
  public static boolean isViewLayoutRtl(View view) {
    return view.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL;
  }

  public static boolean isRtl() {
    return TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()) == View.LAYOUT_DIRECTION_RTL;
  }

  public static void resizeText(TextView textView, int originalTextSize, int minTextSize) {
    final Paint paint = textView.getPaint();
    final int width = textView.getWidth();
    if (width == 0) {
      return;
    }
    textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, originalTextSize);
    float ratio = width / paint.measureText(textView.getText().toString());
    if (ratio <= 1.0f) {
      textView.setTextSize(
          TypedValue.COMPLEX_UNIT_PX, Math.max(minTextSize, originalTextSize * ratio));
    }
  }

  /** Runs a piece of code just before the next draw, after layout and measurement */
  public static void doOnPreDraw(
      @NonNull final View view, final boolean drawNextFrame, final Runnable runnable) {
    view.getViewTreeObserver()
        .addOnPreDrawListener(
            new OnPreDrawListener() {
              @Override
              public boolean onPreDraw() {
                view.getViewTreeObserver().removeOnPreDrawListener(this);
                runnable.run();
                return drawNextFrame;
              }
            });
  }

  public static void doOnPreDraw(
      @NonNull final View view, final boolean drawNextFrame, final ViewRunnable runnable) {
    view.getViewTreeObserver()
        .addOnPreDrawListener(
            new OnPreDrawListener() {
              @Override
              public boolean onPreDraw() {
                view.getViewTreeObserver().removeOnPreDrawListener(this);
                runnable.run(view);
                return drawNextFrame;
              }
            });
  }

  public static void doOnGlobalLayout(@NonNull final View view, final ViewRunnable runnable) {
    view.getViewTreeObserver()
        .addOnGlobalLayoutListener(
            new OnGlobalLayoutListener() {
              @Override
              public void onGlobalLayout() {
                view.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                runnable.run(view);
              }
            });
  }

  /**
   * Returns {@code true} if animations should be disabled.
   *
   * <p>Animations should be disabled if {@link
   * android.provider.Settings.Global#ANIMATOR_DURATION_SCALE} is set to 0 through system settings
   * or the device is in power save mode.
   */
  public static boolean areAnimationsDisabled(Context context) {
    ContentResolver contentResolver = context.getContentResolver();
    PowerManager powerManager = context.getSystemService(PowerManager.class);
    return Settings.Global.getFloat(contentResolver, Global.ANIMATOR_DURATION_SCALE, 1.0f) == 0
        || powerManager.isPowerSaveMode();
  }
}