| /* |
| * 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); |
| } |
| } |