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.LeakyTypefaceStorage;
23import android.graphics.Typeface;
24import android.os.Parcel;
25import android.text.ParcelableSpan;
26import android.text.TextPaint;
27import android.text.TextUtils;
28
29/**
30 * Sets the text color, size, style, and typeface to match a TextAppearance
31 * resource.
32 */
33public class TextAppearanceSpan extends MetricAffectingSpan implements ParcelableSpan {
34    private final String mFamilyName;
35    private final int mStyle;
36    private final int mTextSize;
37    private final ColorStateList mTextColor;
38    private final ColorStateList mTextColorLink;
39    private final Typeface mTypeface;
40
41    /**
42     * Uses the specified TextAppearance resource to determine the
43     * text appearance.  The <code>appearance</code> should be, for example,
44     * <code>android.R.style.TextAppearance_Small</code>.
45     */
46    public TextAppearanceSpan(Context context, int appearance) {
47        this(context, appearance, -1);
48    }
49
50    /**
51     * Uses the specified TextAppearance resource to determine the
52     * text appearance, and the specified text color resource
53     * to determine the color.  The <code>appearance</code> should be,
54     * for example, <code>android.R.style.TextAppearance_Small</code>,
55     * and the <code>colorList</code> should be, for example,
56     * <code>android.R.styleable.Theme_textColorPrimary</code>.
57     */
58    public TextAppearanceSpan(Context context, int appearance, int colorList) {
59        ColorStateList textColor;
60
61        TypedArray a =
62            context.obtainStyledAttributes(appearance,
63                                           com.android.internal.R.styleable.TextAppearance);
64
65        textColor = a.getColorStateList(com.android.internal.R.styleable.
66                                        TextAppearance_textColor);
67        mTextColorLink = a.getColorStateList(com.android.internal.R.styleable.
68                                        TextAppearance_textColorLink);
69        mTextSize = a.getDimensionPixelSize(com.android.internal.R.styleable.
70                                        TextAppearance_textSize, -1);
71
72        mStyle = a.getInt(com.android.internal.R.styleable.TextAppearance_textStyle, 0);
73        if (!context.isRestricted() && context.canLoadUnsafeResources()) {
74            mTypeface = a.getFont(com.android.internal.R.styleable.TextAppearance_fontFamily);
75        } else {
76            mTypeface = null;
77        }
78        if (mTypeface != null) {
79            mFamilyName = null;
80        } else {
81            String family = a.getString(com.android.internal.R.styleable.TextAppearance_fontFamily);
82            if (family != null) {
83                mFamilyName = family;
84            } else {
85                int tf = a.getInt(com.android.internal.R.styleable.TextAppearance_typeface, 0);
86
87                switch (tf) {
88                    case 1:
89                        mFamilyName = "sans";
90                        break;
91
92                    case 2:
93                        mFamilyName = "serif";
94                        break;
95
96                    case 3:
97                        mFamilyName = "monospace";
98                        break;
99
100                    default:
101                        mFamilyName = null;
102                        break;
103                }
104            }
105        }
106
107        a.recycle();
108
109        if (colorList >= 0) {
110            a = context.obtainStyledAttributes(com.android.internal.R.style.Theme,
111                                            com.android.internal.R.styleable.Theme);
112
113            textColor = a.getColorStateList(colorList);
114            a.recycle();
115        }
116
117        mTextColor = textColor;
118    }
119
120    /**
121     * Makes text be drawn with the specified typeface, size, style,
122     * and colors.
123     */
124    public TextAppearanceSpan(String family, int style, int size,
125                              ColorStateList color, ColorStateList linkColor) {
126        mFamilyName = family;
127        mStyle = style;
128        mTextSize = size;
129        mTextColor = color;
130        mTextColorLink = linkColor;
131        mTypeface = null;
132    }
133
134    public TextAppearanceSpan(Parcel src) {
135        mFamilyName = src.readString();
136        mStyle = src.readInt();
137        mTextSize = src.readInt();
138        if (src.readInt() != 0) {
139            mTextColor = ColorStateList.CREATOR.createFromParcel(src);
140        } else {
141            mTextColor = null;
142        }
143        if (src.readInt() != 0) {
144            mTextColorLink = ColorStateList.CREATOR.createFromParcel(src);
145        } else {
146            mTextColorLink = null;
147        }
148        mTypeface = LeakyTypefaceStorage.readTypefaceFromParcel(src);
149    }
150
151    public int getSpanTypeId() {
152        return getSpanTypeIdInternal();
153    }
154
155    /** @hide */
156    public int getSpanTypeIdInternal() {
157        return TextUtils.TEXT_APPEARANCE_SPAN;
158    }
159
160    public int describeContents() {
161        return 0;
162    }
163
164    public void writeToParcel(Parcel dest, int flags) {
165        writeToParcelInternal(dest, flags);
166    }
167
168    /** @hide */
169    public void writeToParcelInternal(Parcel dest, int flags) {
170        dest.writeString(mFamilyName);
171        dest.writeInt(mStyle);
172        dest.writeInt(mTextSize);
173        if (mTextColor != null) {
174            dest.writeInt(1);
175            mTextColor.writeToParcel(dest, flags);
176        } else {
177            dest.writeInt(0);
178        }
179        if (mTextColorLink != null) {
180            dest.writeInt(1);
181            mTextColorLink.writeToParcel(dest, flags);
182        } else {
183            dest.writeInt(0);
184        }
185        LeakyTypefaceStorage.writeTypefaceToParcel(mTypeface, dest);
186    }
187
188    /**
189     * Returns the typeface family specified by this span, or <code>null</code>
190     * if it does not specify one.
191     */
192    public String getFamily() {
193        return mFamilyName;
194    }
195
196    /**
197     * Returns the text color specified by this span, or <code>null</code>
198     * if it does not specify one.
199     */
200    public ColorStateList getTextColor() {
201        return mTextColor;
202    }
203
204    /**
205     * Returns the link color specified by this span, or <code>null</code>
206     * if it does not specify one.
207     */
208    public ColorStateList getLinkTextColor() {
209        return mTextColorLink;
210    }
211
212    /**
213     * Returns the text size specified by this span, or <code>-1</code>
214     * if it does not specify one.
215     */
216    public int getTextSize() {
217        return mTextSize;
218    }
219
220    /**
221     * Returns the text style specified by this span, or <code>0</code>
222     * if it does not specify one.
223     */
224    public int getTextStyle() {
225        return mStyle;
226    }
227
228    @Override
229    public void updateDrawState(TextPaint ds) {
230        updateMeasureState(ds);
231
232        if (mTextColor != null) {
233            ds.setColor(mTextColor.getColorForState(ds.drawableState, 0));
234        }
235
236        if (mTextColorLink != null) {
237            ds.linkColor = mTextColorLink.getColorForState(ds.drawableState, 0);
238        }
239    }
240
241    @Override
242    public void updateMeasureState(TextPaint ds) {
243        final Typeface styledTypeface;
244        int style = 0;
245
246        if (mTypeface != null) {
247            style = mStyle;
248            styledTypeface = Typeface.create(mTypeface, style);
249        } else if (mFamilyName != null || mStyle != 0) {
250            Typeface tf = ds.getTypeface();
251
252            if (tf != null) {
253                style = tf.getStyle();
254            }
255
256            style |= mStyle;
257
258            if (mFamilyName != null) {
259                styledTypeface = Typeface.create(mFamilyName, style);
260            } else if (tf == null) {
261                styledTypeface = Typeface.defaultFromStyle(style);
262            } else {
263                styledTypeface = Typeface.create(tf, style);
264            }
265        } else {
266            styledTypeface = null;
267        }
268
269        if (styledTypeface != null) {
270            int fake = style & ~styledTypeface.getStyle();
271
272            if ((fake & Typeface.BOLD) != 0) {
273                ds.setFakeBoldText(true);
274            }
275
276            if ((fake & Typeface.ITALIC) != 0) {
277                ds.setTextSkewX(-0.25f);
278            }
279
280            ds.setTypeface(styledTypeface);
281        }
282
283        if (mTextSize > 0) {
284            ds.setTextSize(mTextSize);
285        }
286    }
287}
288