StandardLineHeightSpan.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.graphics.Paint.FontMetricsInt;
import android.text.style.LineHeightSpan;
import androidx.annotation.Px;
// LineHeightSpan.Standard is only available on API 29+, but the implementation is trivial. Just //
// re-implement it here.
class StandardLineHeightSpan implements LineHeightSpan {
@Px private final int mLineHeightPx;
StandardLineHeightSpan(int lineHeightPx) {
this.mLineHeightPx = lineHeightPx;
}
@Override
public void chooseHeight(
CharSequence text,
int start,
int end,
int spanstartv,
int lineHeight,
FontMetricsInt fm) {
final int originHeight = fm.descent - fm.ascent;
// If original height is not positive, do nothing.
if (originHeight <= 0) {
return;
}
final float ratio = mLineHeightPx * 1.0f / originHeight;
fm.descent = Math.round(fm.descent * ratio);
fm.ascent = fm.descent - mLineHeightPx;
}
public int getLineHeight() {
return mLineHeightPx;
}
}