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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_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