content: /*
   * Copyright (C) 2006 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 android.text.style;
  
  import android.annotation.FloatRange;
  import android.annotation.NonNull;
  import android.os.Parcel;
  import android.text.ParcelableSpan;
  import android.text.TextPaint;
  import android.text.TextUtils;
  
  /**
   * Uniformly scales the size of the text to which it's attached by a certain proportion.
   * <p>
   * For example, a <code>RelativeSizeSpan</code> that increases the text size by 50% can be
   * constructed like this:
   * <pre>{@code
   *  SpannableString string = new SpannableString("Text with relative size span");
   *string.setSpan(new RelativeSizeSpan(1.5f), 10, 24, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);}</pre>
   * <img src="{@docRoot}reference/android/images/text/style/relativesizespan.png" />
   * <figcaption>Text increased by 50% with <code>RelativeSizeSpan</code>.</figcaption>
   */
  public class RelativeSizeSpan extends MetricAffectingSpan implements ParcelableSpan {
  
      private final float mProportion;
  
      /**
       * Creates a {@link RelativeSizeSpan} based on a proportion.
       *
       * @param proportion the proportion with which the text is scaled.
       */
      public RelativeSizeSpan(@FloatRange(from = 0) float proportion) {
          mProportion = proportion;
      }
  
      /**
       * Creates a {@link RelativeSizeSpan} from a parcel.
       */
      public RelativeSizeSpan(@NonNull Parcel src) {
          mProportion = src.readFloat();
      }
  
      @Override
      public int getSpanTypeId() {
          return getSpanTypeIdInternal();
      }
  
      /** @hide */
      @Override
      public int getSpanTypeIdInternal() {
          return TextUtils.RELATIVE_SIZE_SPAN;
      }
  
      @Override
      public int describeContents() {
          return 0;
      }
  
      @Override
      public void writeToParcel(@NonNull Parcel dest, int flags) {
          writeToParcelInternal(dest, flags);
      }
  
      /** @hide */
      @Override
      public void writeToParcelInternal(@NonNull Parcel dest, int flags) {
          dest.writeFloat(mProportion);
      }
  
      /**
       * @return the proportion with which the text size is changed.
       */
      public float getSizeChange() {
          return mProportion;
      }
  
      @Override
      public void updateDrawState(@NonNull TextPaint ds) {
          ds.setTextSize(ds.getTextSize() * mProportion);
      }
  
      @Override
      public void updateMeasureState(@NonNull TextPaint ds) {
          ds.setTextSize(ds.getTextSize() * mProportion);
      }
  }
  