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      1 /*
      2  * Copyright (C) 2006 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.text.style;
     18 
     19 import android.graphics.Paint;
     20 import android.graphics.Typeface;
     21 import android.os.Parcel;
     22 import android.text.ParcelableSpan;
     23 import android.text.TextPaint;
     24 import android.text.TextUtils;
     25 
     26 /**
     27  * Changes the typeface family of the text to which the span is attached.
     28  */
     29 public class TypefaceSpan extends MetricAffectingSpan implements ParcelableSpan {
     30     private final String mFamily;
     31 
     32     /**
     33      * @param family The font family for this typeface.  Examples include
     34      * "monospace", "serif", and "sans-serif".
     35      */
     36     public TypefaceSpan(String family) {
     37         mFamily = family;
     38     }
     39 
     40     public TypefaceSpan(Parcel src) {
     41         mFamily = src.readString();
     42     }
     43 
     44     public int getSpanTypeId() {
     45         return getSpanTypeIdInternal();
     46     }
     47 
     48     /** @hide */
     49     public int getSpanTypeIdInternal() {
     50         return TextUtils.TYPEFACE_SPAN;
     51     }
     52 
     53     public int describeContents() {
     54         return 0;
     55     }
     56 
     57     public void writeToParcel(Parcel dest, int flags) {
     58         writeToParcelInternal(dest, flags);
     59     }
     60 
     61     /** @hide */
     62     public void writeToParcelInternal(Parcel dest, int flags) {
     63         dest.writeString(mFamily);
     64     }
     65 
     66     /**
     67      * Returns the font family name.
     68      */
     69     public String getFamily() {
     70         return mFamily;
     71     }
     72 
     73     @Override
     74     public void updateDrawState(TextPaint ds) {
     75         apply(ds, mFamily);
     76     }
     77 
     78     @Override
     79     public void updateMeasureState(TextPaint paint) {
     80         apply(paint, mFamily);
     81     }
     82 
     83     private static void apply(Paint paint, String family) {
     84         int oldStyle;
     85 
     86         Typeface old = paint.getTypeface();
     87         if (old == null) {
     88             oldStyle = 0;
     89         } else {
     90             oldStyle = old.getStyle();
     91         }
     92 
     93         Typeface tf = Typeface.create(family, oldStyle);
     94         int fake = oldStyle & ~tf.getStyle();
     95 
     96         if ((fake & Typeface.BOLD) != 0) {
     97             paint.setFakeBoldText(true);
     98         }
     99 
    100         if ((fake & Typeface.ITALIC) != 0) {
    101             paint.setTextSkewX(-0.25f);
    102         }
    103 
    104         paint.setTypeface(tf);
    105     }
    106 }
    107