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
17package android.text.style;
18
19import android.graphics.Paint;
20import android.graphics.Typeface;
21import android.os.Parcel;
22import android.text.ParcelableSpan;
23import android.text.TextPaint;
24import android.text.TextUtils;
25
26/**
27 * Changes the typeface family of the text to which the span is attached.
28 */
29public 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 TextUtils.TYPEFACE_SPAN;
46    }
47
48    public int describeContents() {
49        return 0;
50    }
51
52    public void writeToParcel(Parcel dest, int flags) {
53        dest.writeString(mFamily);
54    }
55
56    /**
57     * Returns the font family name.
58     */
59    public String getFamily() {
60        return mFamily;
61    }
62
63    @Override
64    public void updateDrawState(TextPaint ds) {
65        apply(ds, mFamily);
66    }
67
68    @Override
69    public void updateMeasureState(TextPaint paint) {
70        apply(paint, mFamily);
71    }
72
73    private static void apply(Paint paint, String family) {
74        int oldStyle;
75
76        Typeface old = paint.getTypeface();
77        if (old == null) {
78            oldStyle = 0;
79        } else {
80            oldStyle = old.getStyle();
81        }
82
83        Typeface tf = Typeface.create(family, oldStyle);
84        int fake = oldStyle & ~tf.getStyle();
85
86        if ((fake & Typeface.BOLD) != 0) {
87            paint.setFakeBoldText(true);
88        }
89
90        if ((fake & Typeface.ITALIC) != 0) {
91            paint.setTextSkewX(-0.25f);
92        }
93
94        paint.setTypeface(tf);
95    }
96}
97