TextAppearanceSpan.java revision b8503eb8ac26c4801b565fcfc655fca02f9bb726 
1/*
2 * Copyright (C) 2008 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.content.Context;
20import android.content.res.ColorStateList;
21import android.content.res.TypedArray;
22import android.graphics.Typeface;
23import android.os.Parcel;
24import android.text.ParcelableSpan;
25import android.text.TextPaint;
26import android.text.TextUtils;
27
28/**
29 * Sets the text color, size, style, and typeface to match a TextAppearance
30 * resource.
31 */
32public class TextAppearanceSpan extends MetricAffectingSpan implements ParcelableSpan {
33    private final String mTypeface;
34    private final int mStyle;
35    private final int mTextSize;
36    private final ColorStateList mTextColor;
37    private final ColorStateList mTextColorLink;
38
39    /**
40     * Uses the specified TextAppearance resource to determine the
41     * text appearance.  The <code>appearance</code> should be, for example,
42     * <code>android.R.style.TextAppearance_Small</code>.
43     */
44    public TextAppearanceSpan(Context context, int appearance) {
45        this(context, appearance, -1);
46    }
47
48    /**
49     * Uses the specified TextAppearance resource to determine the
50     * text appearance, and the specified text color resource
51     * to determine the color.  The <code>appearance</code> should be,
52     * for example, <code>android.R.style.TextAppearance_Small</code>,
53     * and the <code>colorList</code> should be, for example,
54     * <code>android.R.styleable.Theme_textColorPrimary</code>.
55     */
56    public TextAppearanceSpan(Context context, int appearance, int colorList) {
57        ColorStateList textColor;
58
59        TypedArray a =
60            context.obtainStyledAttributes(appearance,
61                                           com.android.internal.R.styleable.TextAppearance);
62
63        textColor = a.getColorStateList(com.android.internal.R.styleable.
64                                        TextAppearance_textColor);
65        mTextColorLink = a.getColorStateList(com.android.internal.R.styleable.
66                                        TextAppearance_textColorLink);
67        mTextSize = a.getDimensionPixelSize(com.android.internal.R.styleable.
68                                        TextAppearance_textSize, -1);
69
70        mStyle = a.getInt(com.android.internal.R.styleable.TextAppearance_textStyle, 0);
71        int tf = a.getInt(com.android.internal.R.styleable.TextAppearance_typeface, 0);
72
73        switch (tf) {
74            case 1:
75                mTypeface = "sans";
76                break;
77
78            case 2:
79                mTypeface = "serif";
80                break;
81
82            case 3:
83                mTypeface = "monospace";
84                break;
85
86            default:
87                mTypeface = null;
88                break;
89        }
90
91        a.recycle();
92
93        if (colorList >= 0) {
94            a = context.obtainStyledAttributes(com.android.internal.R.style.Theme,
95                                            com.android.internal.R.styleable.Theme);
96
97            textColor = a.getColorStateList(colorList);
98            a.recycle();
99        }
100
101        mTextColor = textColor;
102    }
103
104    /**
105     * Makes text be drawn with the specified typeface, size, style,
106     * and colors.
107     */
108    public TextAppearanceSpan(String family, int style, int size,
109                              ColorStateList color, ColorStateList linkColor) {
110        mTypeface = family;
111        mStyle = style;
112        mTextSize = size;
113        mTextColor = color;
114        mTextColorLink = linkColor;
115    }
116
117    public TextAppearanceSpan(Parcel src) {
118        mTypeface = src.readString();
119        mStyle = src.readInt();
120        mTextSize = src.readInt();
121        if (src.readInt() != 0) {
122            mTextColor = ColorStateList.CREATOR.createFromParcel(src);
123        } else {
124            mTextColor = null;
125        }
126        if (src.readInt() != 0) {
127            mTextColorLink = ColorStateList.CREATOR.createFromParcel(src);
128        } else {
129            mTextColorLink = null;
130        }
131    }
132
133    public int getSpanTypeId() {
134        return TextUtils.TEXT_APPEARANCE_SPAN;
135    }
136
137    public int describeContents() {
138        return 0;
139    }
140
141    public void writeToParcel(Parcel dest, int flags) {
142        dest.writeString(mTypeface);
143        dest.writeInt(mStyle);
144        dest.writeInt(mTextSize);
145        if (mTextColor != null) {
146            dest.writeInt(1);
147            mTextColor.writeToParcel(dest, flags);
148        } else {
149            dest.writeInt(0);
150        }
151        if (mTextColorLink != null) {
152            dest.writeInt(1);
153            mTextColorLink.writeToParcel(dest, flags);
154        } else {
155            dest.writeInt(0);
156        }
157    }
158
159    /**
160     * Returns the typeface family specified by this span, or <code>null</code>
161     * if it does not specify one.
162     */
163    public String getFamily() {
164        return mTypeface;
165    }
166
167    /**
168     * Returns the text color specified by this span, or <code>null</code>
169     * if it does not specify one.
170     */
171    public ColorStateList getTextColor() {
172        return mTextColor;
173    }
174
175    /**
176     * Returns the link color specified by this span, or <code>null</code>
177     * if it does not specify one.
178     */
179    public ColorStateList getLinkTextColor() {
180        return mTextColorLink;
181    }
182
183    /**
184     * Returns the text size specified by this span, or <code>-1</code>
185     * if it does not specify one.
186     */
187    public int getTextSize() {
188        return mTextSize;
189    }
190
191    /**
192     * Returns the text style specified by this span, or <code>0</code>
193     * if it does not specify one.
194     */
195    public int getTextStyle() {
196        return mStyle;
197    }
198
199    @Override
200    public void updateDrawState(TextPaint ds) {
201        updateMeasureState(ds);
202
203        if (mTextColor != null) {
204            ds.setColor(mTextColor.getColorForState(ds.drawableState, 0));
205        }
206
207        if (mTextColorLink != null) {
208            ds.linkColor = mTextColorLink.getColorForState(ds.drawableState, 0);
209        }
210    }
211
212    @Override
213    public void updateMeasureState(TextPaint ds) {
214        if (mTypeface != null || mStyle != 0) {
215            Typeface tf = ds.getTypeface();
216            int style = 0;
217
218            if (tf != null) {
219                style = tf.getStyle();
220            }
221
222            style |= mStyle;
223
224            if (mTypeface != null) {
225                tf = Typeface.create(mTypeface, style);
226            } else if (tf == null) {
227                tf = Typeface.defaultFromStyle(style);
228            } else {
229                tf = Typeface.create(tf, style);
230            }
231
232            int fake = style & ~tf.getStyle();
233
234            if ((fake & Typeface.BOLD) != 0) {
235                ds.setFakeBoldText(true);
236            }
237
238            if ((fake & Typeface.ITALIC) != 0) {
239                ds.setTextSkewX(-0.25f);
240            }
241
242            ds.setTypeface(tf);
243        }
244
245        if (mTextSize > 0) {
246            ds.setTextSize(mTextSize);
247        }
248    }
249}
250