TextAppearanceSpan.java revision 54b6cfa9a9e5b861a9930af873580d6dc20f773c 
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.Paint;
23import android.graphics.Typeface;
24import android.text.TextPaint;
25
26/**
27 * Sets the text color, size, style, and typeface to match a TextAppearance
28 * resource.
29 */
30public class TextAppearanceSpan extends MetricAffectingSpan {
31    private String mTypeface;
32    private int mStyle;
33    private int mTextSize;
34    private ColorStateList mTextColor;
35    private ColorStateList mTextColorLink;
36
37    /**
38     * Uses the specified TextAppearance resource to determine the
39     * text appearance.  The <code>appearance</code> should be, for example,
40     * <code>android.R.style.TextAppearance_Small</code>.
41     */
42    public TextAppearanceSpan(Context context, int appearance) {
43        this(context, appearance, -1);
44    }
45
46    /**
47     * Uses the specified TextAppearance resource to determine the
48     * text appearance, and the specified text color resource
49     * to determine the color.  The <code>appearance</code> should be,
50     * for example, <code>android.R.style.TextAppearance_Small</code>,
51     * and the <code>colorList</code> should be, for example,
52     * <code>android.R.styleable.Theme_textColorDim</code>.
53     */
54    public TextAppearanceSpan(Context context, int appearance,
55                              int colorList) {
56        TypedArray a =
57            context.obtainStyledAttributes(appearance,
58                                           com.android.internal.R.styleable.TextAppearance);
59
60        mTextColor = a.getColorStateList(com.android.internal.R.styleable.
61                                        TextAppearance_textColor);
62        mTextColorLink = a.getColorStateList(com.android.internal.R.styleable.
63                                        TextAppearance_textColorLink);
64        mTextSize = a.getDimensionPixelSize(com.android.internal.R.styleable.
65                                        TextAppearance_textSize, -1);
66
67        mStyle = a.getInt(com.android.internal.R.styleable.TextAppearance_textStyle, 0);
68        int tf = a.getInt(com.android.internal.R.styleable.TextAppearance_typeface, 0);
69
70        switch (tf) {
71            case 1:
72                mTypeface = "sans";
73                break;
74
75            case 2:
76                mTypeface = "serif";
77                break;
78
79            case 3:
80                mTypeface = "monospace";
81                break;
82        }
83
84        a.recycle();
85
86        if (colorList >= 0) {
87            a = context.obtainStyledAttributes(com.android.internal.R.style.Theme,
88                                            com.android.internal.R.styleable.Theme);
89
90            mTextColor = a.getColorStateList(colorList);
91            a.recycle();
92        }
93    }
94
95    /**
96     * Makes text be drawn with the specified typeface, size, style,
97     * and colors.
98     */
99    public TextAppearanceSpan(String family, int style, int size,
100                              ColorStateList color, ColorStateList linkColor) {
101        mTypeface = family;
102        mStyle = style;
103        mTextSize = size;
104        mTextColor = color;
105        mTextColorLink = linkColor;
106    }
107
108    /**
109     * Returns the typeface family specified by this span, or <code>null</code>
110     * if it does not specify one.
111     */
112    public String getFamily() {
113        return mTypeface;
114    }
115
116    /**
117     * Returns the text color specified by this span, or <code>null</code>
118     * if it does not specify one.
119     */
120    public ColorStateList getTextColor() {
121        return mTextColor;
122    }
123
124    /**
125     * Returns the link color specified by this span, or <code>null</code>
126     * if it does not specify one.
127     */
128    public ColorStateList getLinkTextColor() {
129        return mTextColorLink;
130    }
131
132    /**
133     * Returns the text size specified by this span, or <code>-1</code>
134     * if it does not specify one.
135     */
136    public int getTextSize() {
137        return mTextSize;
138    }
139
140    /**
141     * Returns the text style specified by this span, or <code>0</code>
142     * if it does not specify one.
143     */
144    public int getTextStyle() {
145        return mStyle;
146    }
147
148    @Override
149    public void updateDrawState(TextPaint ds) {
150        updateMeasureState(ds);
151
152        if (mTextColor != null) {
153            ds.setColor(mTextColor.getColorForState(ds.drawableState, 0));
154        }
155
156        if (mTextColorLink != null) {
157            ds.linkColor = mTextColor.getColorForState(ds.drawableState, 0);
158        }
159    }
160
161    @Override
162    public void updateMeasureState(TextPaint ds) {
163        if (mTypeface != null || mStyle != 0) {
164            Typeface tf = ds.getTypeface();
165            int style = 0;
166
167            if (tf != null) {
168                style = tf.getStyle();
169            }
170
171            style |= mStyle;
172
173            if (mTypeface != null) {
174                tf = Typeface.create(mTypeface, style);
175            } else if (tf == null) {
176                tf = Typeface.defaultFromStyle(style);
177            } else {
178                tf = Typeface.create(tf, style);
179            }
180
181            int fake = style & ~tf.getStyle();
182
183            if ((fake & Typeface.BOLD) != 0) {
184                ds.setFakeBoldText(true);
185            }
186
187            if ((fake & Typeface.ITALIC) != 0) {
188                ds.setTextSkewX(-0.25f);
189            }
190
191            ds.setTypeface(tf);
192        }
193
194        if (mTextSize > 0) {
195            ds.setTextSize(mTextSize);
196        }
197    }
198}
199