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/*
* 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);
}
}
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