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      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 
     17 package android.text.style;
     18 
     19 import android.content.Context;
     20 import android.content.res.ColorStateList;
     21 import android.content.res.TypedArray;
     22 import android.graphics.Typeface;
     23 import android.os.Parcel;
     24 import android.text.ParcelableSpan;
     25 import android.text.TextPaint;
     26 import android.text.TextUtils;
     27 
     28 /**
     29  * Sets the text color, size, style, and typeface to match a TextAppearance
     30  * resource.
     31  */
     32 public 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_textColorDim</code>.
     55      */
     56     public TextAppearanceSpan(Context context, int appearance,
     57                               int colorList) {
     58         ColorStateList textColor;
     59 
     60         TypedArray a =
     61             context.obtainStyledAttributes(appearance,
     62                                            com.android.internal.R.styleable.TextAppearance);
     63 
     64         textColor = a.getColorStateList(com.android.internal.R.styleable.
     65                                         TextAppearance_textColor);
     66         mTextColorLink = a.getColorStateList(com.android.internal.R.styleable.
     67                                         TextAppearance_textColorLink);
     68         mTextSize = a.getDimensionPixelSize(com.android.internal.R.styleable.
     69                                         TextAppearance_textSize, -1);
     70 
     71         mStyle = a.getInt(com.android.internal.R.styleable.TextAppearance_textStyle, 0);
     72         int tf = a.getInt(com.android.internal.R.styleable.TextAppearance_typeface, 0);
     73 
     74         switch (tf) {
     75             case 1:
     76                 mTypeface = "sans";
     77                 break;
     78 
     79             case 2:
     80                 mTypeface = "serif";
     81                 break;
     82 
     83             case 3:
     84                 mTypeface = "monospace";
     85                 break;
     86 
     87             default:
     88                 mTypeface = null;
     89                 break;
     90         }
     91 
     92         a.recycle();
     93 
     94         if (colorList >= 0) {
     95             a = context.obtainStyledAttributes(com.android.internal.R.style.Theme,
     96                                             com.android.internal.R.styleable.Theme);
     97 
     98             textColor = a.getColorStateList(colorList);
     99             a.recycle();
    100         }
    101 
    102         mTextColor = textColor;
    103     }
    104 
    105     /**
    106      * Makes text be drawn with the specified typeface, size, style,
    107      * and colors.
    108      */
    109     public TextAppearanceSpan(String family, int style, int size,
    110                               ColorStateList color, ColorStateList linkColor) {
    111         mTypeface = family;
    112         mStyle = style;
    113         mTextSize = size;
    114         mTextColor = color;
    115         mTextColorLink = linkColor;
    116     }
    117 
    118     public TextAppearanceSpan(Parcel src) {
    119         mTypeface = src.readString();
    120         mStyle = src.readInt();
    121         mTextSize = src.readInt();
    122         if (src.readInt() != 0) {
    123             mTextColor = ColorStateList.CREATOR.createFromParcel(src);
    124         } else {
    125             mTextColor = null;
    126         }
    127         if (src.readInt() != 0) {
    128             mTextColorLink = ColorStateList.CREATOR.createFromParcel(src);
    129         } else {
    130             mTextColorLink = null;
    131         }
    132     }
    133 
    134     public int getSpanTypeId() {
    135         return TextUtils.TEXT_APPEARANCE_SPAN;
    136     }
    137 
    138     public int describeContents() {
    139         return 0;
    140     }
    141 
    142     public void writeToParcel(Parcel dest, int flags) {
    143         dest.writeString(mTypeface);
    144         dest.writeInt(mStyle);
    145         dest.writeInt(mTextSize);
    146         if (mTextColor != null) {
    147             dest.writeInt(1);
    148             mTextColor.writeToParcel(dest, flags);
    149         } else {
    150             dest.writeInt(0);
    151         }
    152         if (mTextColorLink != null) {
    153             dest.writeInt(1);
    154             mTextColorLink.writeToParcel(dest, flags);
    155         } else {
    156             dest.writeInt(0);
    157         }
    158     }
    159 
    160     /**
    161      * Returns the typeface family specified by this span, or <code>null</code>
    162      * if it does not specify one.
    163      */
    164     public String getFamily() {
    165         return mTypeface;
    166     }
    167 
    168     /**
    169      * Returns the text color specified by this span, or <code>null</code>
    170      * if it does not specify one.
    171      */
    172     public ColorStateList getTextColor() {
    173         return mTextColor;
    174     }
    175 
    176     /**
    177      * Returns the link color specified by this span, or <code>null</code>
    178      * if it does not specify one.
    179      */
    180     public ColorStateList getLinkTextColor() {
    181         return mTextColorLink;
    182     }
    183 
    184     /**
    185      * Returns the text size specified by this span, or <code>-1</code>
    186      * if it does not specify one.
    187      */
    188     public int getTextSize() {
    189         return mTextSize;
    190     }
    191 
    192     /**
    193      * Returns the text style specified by this span, or <code>0</code>
    194      * if it does not specify one.
    195      */
    196     public int getTextStyle() {
    197         return mStyle;
    198     }
    199 
    200     @Override
    201     public void updateDrawState(TextPaint ds) {
    202         updateMeasureState(ds);
    203 
    204         if (mTextColor != null) {
    205             ds.setColor(mTextColor.getColorForState(ds.drawableState, 0));
    206         }
    207 
    208         if (mTextColorLink != null) {
    209             ds.linkColor = mTextColor.getColorForState(ds.drawableState, 0);
    210         }
    211     }
    212 
    213     @Override
    214     public void updateMeasureState(TextPaint ds) {
    215         if (mTypeface != null || mStyle != 0) {
    216             Typeface tf = ds.getTypeface();
    217             int style = 0;
    218 
    219             if (tf != null) {
    220                 style = tf.getStyle();
    221             }
    222 
    223             style |= mStyle;
    224 
    225             if (mTypeface != null) {
    226                 tf = Typeface.create(mTypeface, style);
    227             } else if (tf == null) {
    228                 tf = Typeface.defaultFromStyle(style);
    229             } else {
    230                 tf = Typeface.create(tf, style);
    231             }
    232 
    233             int fake = style & ~tf.getStyle();
    234 
    235             if ((fake & Typeface.BOLD) != 0) {
    236                 ds.setFakeBoldText(true);
    237             }
    238 
    239             if ((fake & Typeface.ITALIC) != 0) {
    240                 ds.setTextSkewX(-0.25f);
    241             }
    242 
    243             ds.setTypeface(tf);
    244         }
    245 
    246         if (mTextSize > 0) {
    247             ds.setTextSize(mTextSize);
    248         }
    249     }
    250 }
    251