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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.content.res.Configuration;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.graphics.fonts.FontStyle;
import android.os.Parcel;
import android.text.ParcelableSpan;
import android.text.TextPaint;
import android.text.TextUtils;
/**
* Span that allows setting the style of the text it's attached to.
* Possible styles are: {@link Typeface#NORMAL}, {@link Typeface#BOLD}, {@link Typeface#ITALIC} and
* {@link Typeface#BOLD_ITALIC}.
* <p>
* Note that styles are cumulative -- if both bold and italic are set in
* separate spans, or if the base style is bold and a span calls for italic,
* you get bold italic. You can't turn off a style from the base style.
* <p>
* For example, the <code>StyleSpan</code> can be used like this:
* <pre>
* SpannableString string = new SpannableString("Bold and italic text");
* string.setSpan(new StyleSpan(Typeface.BOLD), 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
* string.setSpan(new StyleSpan(Typeface.ITALIC), 9, 15, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
* </pre>
* <img src="{@docRoot}reference/android/images/text/style/stylespan.png" />
* <figcaption>Text styled bold and italic with the <code>StyleSpan</code>.</figcaption>
*/
public class StyleSpan extends MetricAffectingSpan implements ParcelableSpan {
private final int mStyle;
private final int mFontWeightAdjustment;
/**
* Creates a {@link StyleSpan} from a style.
*
* @param style An integer constant describing the style for this span. Examples
* include bold, italic, and normal. Values are constants defined
* in {@link Typeface}.
*/
public StyleSpan(int style) {
this(style, Configuration.FONT_WEIGHT_ADJUSTMENT_UNDEFINED);
}
/**
* Creates a {@link StyleSpan} from a style and font weight adjustment.
*
* @param style An integer constant describing the style for this span. Examples
* include bold, italic, and normal. Values are constants defined
* in {@link Typeface}.
* @param fontWeightAdjustment An integer describing the adjustment to be made to the font
* weight. This is added to the value of the current weight returned by
* {@link Typeface#getWeight()}.
* @see Configuration#fontWeightAdjustment This is the adjustment in text font weight
* that is used to reflect the current user's preference for increasing font weight.
*/
public StyleSpan(@Typeface.Style int style, int fontWeightAdjustment) {
mStyle = style;
mFontWeightAdjustment = fontWeightAdjustment;
}
/**
* Creates a {@link StyleSpan} from a parcel.
*
* @param src the parcel
*/
public StyleSpan(@NonNull Parcel src) {
mStyle = src.readInt();
mFontWeightAdjustment = src.readInt();
}
@Override
public int getSpanTypeId() {
return getSpanTypeIdInternal();
}
/** @hide */
@Override
public int getSpanTypeIdInternal() {
return TextUtils.STYLE_SPAN;
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
writeToParcelInternal(dest, flags);
}
/** @hide */
@Override
public void writeToParcelInternal(@NonNull Parcel dest, int flags) {
dest.writeInt(mStyle);
dest.writeInt(mFontWeightAdjustment);
}
/**
* Returns the style constant defined in {@link Typeface}.
*/
public int getStyle() {
return mStyle;
}
/**
* Returns the font weight adjustment specified by this span.
* <p>
* This can be {@link Configuration#FONT_WEIGHT_ADJUSTMENT_UNDEFINED}. This is added to the
* value of the current weight returned by {@link Typeface#getWeight()}.
*/
public int getFontWeightAdjustment() {
return mFontWeightAdjustment;
}
@Override
public void updateDrawState(TextPaint ds) {
apply(ds, mStyle, mFontWeightAdjustment);
}
@Override
public void updateMeasureState(TextPaint paint) {
apply(paint, mStyle, mFontWeightAdjustment);
}
private static void apply(Paint paint, int style, int fontWeightAdjustment) {
int oldStyle;
Typeface old = paint.getTypeface();
if (old == null) {
oldStyle = 0;
} else {
oldStyle = old.getStyle();
}
int want = oldStyle | style;
Typeface tf;
if (old == null) {
tf = Typeface.defaultFromStyle(want);
} else {
tf = Typeface.create(old, want);
}
// Base typeface may already be bolded by auto bold. Bold further.
if ((style & Typeface.BOLD) != 0) {
if (fontWeightAdjustment != 0
&& fontWeightAdjustment != Configuration.FONT_WEIGHT_ADJUSTMENT_UNDEFINED) {
int newWeight = Math.min(
Math.max(tf.getWeight() + fontWeightAdjustment, FontStyle.FONT_WEIGHT_MIN),
FontStyle.FONT_WEIGHT_MAX);
boolean italic = (want & Typeface.ITALIC) != 0;
tf = Typeface.create(tf, newWeight, italic);
}
}
int fake = want & ~tf.getStyle();
if ((fake & Typeface.BOLD) != 0) {
paint.setFakeBoldText(true);
}
if ((fake & Typeface.ITALIC) != 0) {
paint.setTextSkewX(-0.25f);
}
paint.setTypeface(tf);
}
}
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