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        String family = a.getString(com.android.internal.R.styleable.TextAppearance_fontFamily);
72        if (family != null) {
73            mTypeface = family;
74        } else {
75            int tf = a.getInt(com.android.internal.R.styleable.TextAppearance_typeface, 0);
76
77            switch (tf) {
78                case 1:
79                    mTypeface = "sans";
80                    break;
81
82                case 2:
83                    mTypeface = "serif";
84                    break;
85
86                case 3:
87                    mTypeface = "monospace";
88                    break;
89
90                default:
91                    mTypeface = null;
92                    break;
93            }
94        }
95
96        a.recycle();
97
98        if (colorList >= 0) {
99            a = context.obtainStyledAttributes(com.android.internal.R.style.Theme,
100                                            com.android.internal.R.styleable.Theme);
101
102            textColor = a.getColorStateList(colorList);
103            a.recycle();
104        }
105
106        mTextColor = textColor;
107    }
108
109    /**
110     * Makes text be drawn with the specified typeface, size, style,
111     * and colors.
112     */
113    public TextAppearanceSpan(String family, int style, int size,
114                              ColorStateList color, ColorStateList linkColor) {
115        mTypeface = family;
116        mStyle = style;
117        mTextSize = size;
118        mTextColor = color;
119        mTextColorLink = linkColor;
120    }
121
122    public TextAppearanceSpan(Parcel src) {
123        mTypeface = src.readString();
124        mStyle = src.readInt();
125        mTextSize = src.readInt();
126        if (src.readInt() != 0) {
127            mTextColor = ColorStateList.CREATOR.createFromParcel(src);
128        } else {
129            mTextColor = null;
130        }
131        if (src.readInt() != 0) {
132            mTextColorLink = ColorStateList.CREATOR.createFromParcel(src);
133        } else {
134            mTextColorLink = null;
135        }
136    }
137
138    public int getSpanTypeId() {
139        return TextUtils.TEXT_APPEARANCE_SPAN;
140    }
141
142    public int describeContents() {
143        return 0;
144    }
145
146    public void writeToParcel(Parcel dest, int flags) {
147        dest.writeString(mTypeface);
148        dest.writeInt(mStyle);
149        dest.writeInt(mTextSize);
150        if (mTextColor != null) {
151            dest.writeInt(1);
152            mTextColor.writeToParcel(dest, flags);
153        } else {
154            dest.writeInt(0);
155        }
156        if (mTextColorLink != null) {
157            dest.writeInt(1);
158            mTextColorLink.writeToParcel(dest, flags);
159        } else {
160            dest.writeInt(0);
161        }
162    }
163
164    /**
165     * Returns the typeface family specified by this span, or <code>null</code>
166     * if it does not specify one.
167     */
168    public String getFamily() {
169        return mTypeface;
170    }
171
172    /**
173     * Returns the text color specified by this span, or <code>null</code>
174     * if it does not specify one.
175     */
176    public ColorStateList getTextColor() {
177        return mTextColor;
178    }
179
180    /**
181     * Returns the link color specified by this span, or <code>null</code>
182     * if it does not specify one.
183     */
184    public ColorStateList getLinkTextColor() {
185        return mTextColorLink;
186    }
187
188    /**
189     * Returns the text size specified by this span, or <code>-1</code>
190     * if it does not specify one.
191     */
192    public int getTextSize() {
193        return mTextSize;
194    }
195
196    /**
197     * Returns the text style specified by this span, or <code>0</code>
198     * if it does not specify one.
199     */
200    public int getTextStyle() {
201        return mStyle;
202    }
203
204    @Override
205    public void updateDrawState(TextPaint ds) {
206        updateMeasureState(ds);
207
208        if (mTextColor != null) {
209            ds.setColor(mTextColor.getColorForState(ds.drawableState, 0));
210        }
211
212        if (mTextColorLink != null) {
213            ds.linkColor = mTextColorLink.getColorForState(ds.drawableState, 0);
214        }
215    }
216
217    @Override
218    public void updateMeasureState(TextPaint ds) {
219        if (mTypeface != null || mStyle != 0) {
220            Typeface tf = ds.getTypeface();
221            int style = 0;
222
223            if (tf != null) {
224                style = tf.getStyle();
225            }
226
227            style |= mStyle;
228
229            if (mTypeface != null) {
230                tf = Typeface.create(mTypeface, style);
231            } else if (tf == null) {
232                tf = Typeface.defaultFromStyle(style);
233            } else {
234                tf = Typeface.create(tf, style);
235            }
236
237            int fake = style & ~tf.getStyle();
238
239            if ((fake & Typeface.BOLD) != 0) {
240                ds.setFakeBoldText(true);
241            }
242
243            if ((fake & Typeface.ITALIC) != 0) {
244                ds.setTextSkewX(-0.25f);
245            }
246
247            ds.setTypeface(tf);
248        }
249
250        if (mTextSize > 0) {
251            ds.setTextSize(mTextSize);
252        }
253    }
254}
255