LetterSpacingSpan.java
/*
* Copyright 2021 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 androidx.wear.tiles.renderer.internal;
import android.text.TextPaint;
import android.text.style.MetricAffectingSpan;
import androidx.annotation.NonNull;
/** LetterSpacingSpan class used to apply custom spacing between letters. */
public class LetterSpacingSpan extends MetricAffectingSpan {
private final float mLetterSpacingEm;
/** @param letterSpacingEm letter-spacing for text. */
public LetterSpacingSpan(float letterSpacingEm) {
this.mLetterSpacingEm = letterSpacingEm;
}
@Override
public void updateDrawState(@NonNull TextPaint textPaint) {
updateTextPaint(textPaint);
}
@Override
public void updateMeasureState(@NonNull TextPaint textPaint) {
updateTextPaint(textPaint);
}
private void updateTextPaint(@NonNull TextPaint textPaint) {
textPaint.setLetterSpacing(mLetterSpacingEm);
}
}