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