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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.FloatRange;
import android.annotation.NonNull;
import android.os.Parcel;
import android.text.ParcelableSpan;
import android.text.TextPaint;
import android.text.TextUtils;
/**
* Scales horizontally the size of the text to which it's attached by a certain factor.
* <p>
* Values > 1.0 will stretch the text wider. Values < 1.0 will stretch the text narrower.
* <p>
* For example, a <code>ScaleXSpan</code> that stretches the text size by 100% can be
* constructed like this:
* <pre>{@code
* SpannableString string = new SpannableString("Text with ScaleX span");
*string.setSpan(new ScaleXSpan(2f), 10, 16, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);}</pre>
* <img src="{@docRoot}reference/android/images/text/style/scalexspan.png" />
* <figcaption>Text scaled by 100% with <code>ScaleXSpan</code>.</figcaption>
*/
public class ScaleXSpan extends MetricAffectingSpan implements ParcelableSpan {
private final float mProportion;
/**
* Creates a {@link ScaleXSpan} based on a proportion. Values > 1.0 will stretch the text wider.
* Values < 1.0 will stretch the text narrower.
*
* @param proportion the horizontal scale factor.
*/
public ScaleXSpan(@FloatRange(from = 0) float proportion) {
mProportion = proportion;
}
/**
* Creates a {@link ScaleXSpan} from a parcel.
*/
public ScaleXSpan(@NonNull Parcel src) {
mProportion = src.readFloat();
}
@Override
public int getSpanTypeId() {
return getSpanTypeIdInternal();
}
/** @hide */
@Override
public int getSpanTypeIdInternal() {
return TextUtils.SCALE_X_SPAN;
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(@NonNull Parcel dest, int flags) {
writeToParcelInternal(dest, flags);
}
/** @hide */
@Override
public void writeToParcelInternal(@NonNull Parcel dest, int flags) {
dest.writeFloat(mProportion);
}
/**
* Get the horizontal scale factor for the text.
*
* @return the horizontal scale factor.
*/
public float getScaleX() {
return mProportion;
}
@Override
public void updateDrawState(TextPaint ds) {
ds.setTextScaleX(ds.getTextScaleX() * mProportion);
}
@Override
public void updateMeasureState(TextPaint ds) {
ds.setTextScaleX(ds.getTextScaleX() * mProportion);
}
}
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