| /* |
| * 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.NonNull; |
| import android.os.Parcel; |
| import android.text.ParcelableSpan; |
| import android.text.TextPaint; |
| import android.text.TextUtils; |
| |
| /** |
| * The span that moves the position of the text baseline lower. |
| * <p> |
| * The span can be used like this: |
| * <pre>{@code |
| * SpannableString string = new SpannableString("☕- C8H10N4O2\n"); |
| *string.setSpan(new SubscriptSpan(), 4, 5, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); |
| *string.setSpan(new SubscriptSpan(), 6, 8, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); |
| *string.setSpan(new SubscriptSpan(), 9, 10, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); |
| *string.setSpan(new SubscriptSpan(), 11, 12, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);}</pre> |
| * <img src="{@docRoot}reference/android/images/text/style/subscriptspan.png" /> |
| * <figcaption>Text with <code>SubscriptSpan</code>.</figcaption> |
| * Note: Since the span affects the position of the text, if the text is on the last line of a |
| * TextView, it may appear cut. |
| */ |
| public class SubscriptSpan extends MetricAffectingSpan implements ParcelableSpan { |
| |
| /** |
| * Creates a {@link SubscriptSpan}. |
| */ |
| public SubscriptSpan() { |
| } |
| |
| /** |
| * Creates a {@link SubscriptSpan} from a parcel. |
| */ |
| public SubscriptSpan(@NonNull Parcel src) { |
| } |
| |
| @Override |
| public int getSpanTypeId() { |
| return getSpanTypeIdInternal(); |
| } |
| |
| /** @hide */ |
| @Override |
| public int getSpanTypeIdInternal() { |
| return TextUtils.SUBSCRIPT_SPAN; |
| } |
| |
| @Override |
| public int describeContents() { |
| return 0; |
| } |
| |
| @Override |
| public void writeToParcel(Parcel dest, int flags) { |
| writeToParcelInternal(dest, flags); |
| } |
| |
| /** @hide */ |
| @Override |
| public void writeToParcelInternal(Parcel dest, int flags) { |
| } |
| |
| @Override |
| public void updateDrawState(@NonNull TextPaint textPaint) { |
| textPaint.baselineShift -= (int) (textPaint.ascent() / 2); |
| } |
| |
| @Override |
| public void updateMeasureState(@NonNull TextPaint textPaint) { |
| textPaint.baselineShift -= (int) (textPaint.ascent() / 2); |
| } |
| } |