95 lines
2.8 KiB
Java
95 lines
2.8 KiB
Java
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/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.text.style;
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import android.annotation.NonNull;
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import android.os.Parcel;
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import android.text.ParcelableSpan;
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import android.text.TextPaint;
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import android.text.TextUtils;
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/**
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* The span that moves the position of the text baseline lower.
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* <p>
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* The span can be used like this:
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* <pre>{@code
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* SpannableString string = new SpannableString("☕- C8H10N4O2\n");
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*string.setSpan(new SubscriptSpan(), 4, 5, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
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*string.setSpan(new SubscriptSpan(), 6, 8, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
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*string.setSpan(new SubscriptSpan(), 9, 10, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
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*string.setSpan(new SubscriptSpan(), 11, 12, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);}</pre>
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* <img src="{@docRoot}reference/android/images/text/style/subscriptspan.png" />
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* <figcaption>Text with <code>SubscriptSpan</code>.</figcaption>
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* Note: Since the span affects the position of the text, if the text is on the last line of a
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* TextView, it may appear cut.
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*/
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public class SubscriptSpan extends MetricAffectingSpan implements ParcelableSpan {
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/**
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* Creates a {@link SubscriptSpan}.
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*/
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public SubscriptSpan() {
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}
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/**
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* Creates a {@link SubscriptSpan} from a parcel.
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*/
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public SubscriptSpan(@NonNull Parcel src) {
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}
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@Override
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public int getSpanTypeId() {
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return getSpanTypeIdInternal();
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}
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/** @hide */
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@Override
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public int getSpanTypeIdInternal() {
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return TextUtils.SUBSCRIPT_SPAN;
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}
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@Override
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public int describeContents() {
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return 0;
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}
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@Override
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public void writeToParcel(Parcel dest, int flags) {
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writeToParcelInternal(dest, flags);
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}
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/** @hide */
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@Override
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public void writeToParcelInternal(Parcel dest, int flags) {
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}
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@Override
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public void updateDrawState(@NonNull TextPaint textPaint) {
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textPaint.baselineShift -= (int) (textPaint.ascent() / 2);
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}
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@Override
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public void updateMeasureState(@NonNull TextPaint textPaint) {
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textPaint.baselineShift -= (int) (textPaint.ascent() / 2);
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}
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@Override
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public String toString() {
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return "SubscriptSpan{}";
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}
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}
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