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      1 /*
      2  * Copyright (C) 2006 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.graphics.Canvas;
     20 import android.graphics.Paint;
     21 import android.graphics.Path;
     22 import android.graphics.Path.Direction;
     23 import android.os.Parcel;
     24 import android.text.Layout;
     25 import android.text.ParcelableSpan;
     26 import android.text.Spanned;
     27 import android.text.TextUtils;
     28 
     29 public class BulletSpan implements LeadingMarginSpan, ParcelableSpan {
     30     private final int mGapWidth;
     31     private final boolean mWantColor;
     32     private final int mColor;
     33 
     34     private static final int BULLET_RADIUS = 3;
     35     private static Path sBulletPath = null;
     36     public static final int STANDARD_GAP_WIDTH = 2;
     37 
     38     public BulletSpan() {
     39         mGapWidth = STANDARD_GAP_WIDTH;
     40         mWantColor = false;
     41         mColor = 0;
     42     }
     43 
     44     public BulletSpan(int gapWidth) {
     45         mGapWidth = gapWidth;
     46         mWantColor = false;
     47         mColor = 0;
     48     }
     49 
     50     public BulletSpan(int gapWidth, int color) {
     51         mGapWidth = gapWidth;
     52         mWantColor = true;
     53         mColor = color;
     54     }
     55 
     56     public BulletSpan(Parcel src) {
     57         mGapWidth = src.readInt();
     58         mWantColor = src.readInt() != 0;
     59         mColor = src.readInt();
     60     }
     61 
     62     public int getSpanTypeId() {
     63         return TextUtils.BULLET_SPAN;
     64     }
     65 
     66     public int describeContents() {
     67         return 0;
     68     }
     69 
     70     public void writeToParcel(Parcel dest, int flags) {
     71         dest.writeInt(mGapWidth);
     72         dest.writeInt(mWantColor ? 1 : 0);
     73         dest.writeInt(mColor);
     74     }
     75 
     76     public int getLeadingMargin(boolean first) {
     77         return 2 * BULLET_RADIUS + mGapWidth;
     78     }
     79 
     80     public void drawLeadingMargin(Canvas c, Paint p, int x, int dir,
     81                                   int top, int baseline, int bottom,
     82                                   CharSequence text, int start, int end,
     83                                   boolean first, Layout l) {
     84         if (((Spanned) text).getSpanStart(this) == start) {
     85             Paint.Style style = p.getStyle();
     86             int oldcolor = 0;
     87 
     88             if (mWantColor) {
     89                 oldcolor = p.getColor();
     90                 p.setColor(mColor);
     91             }
     92 
     93             p.setStyle(Paint.Style.FILL);
     94 
     95             if (c.isHardwareAccelerated()) {
     96                 if (sBulletPath == null) {
     97                     sBulletPath = new Path();
     98                     // Bullet is slightly better to avoid aliasing artifacts on mdpi devices.
     99                     sBulletPath.addCircle(0.0f, 0.0f, 1.2f * BULLET_RADIUS, Direction.CW);
    100                 }
    101 
    102                 c.save();
    103                 c.translate(x + dir * BULLET_RADIUS, (top + bottom) / 2.0f);
    104                 c.drawPath(sBulletPath, p);
    105                 c.restore();
    106             } else {
    107                 c.drawCircle(x + dir * BULLET_RADIUS, (top + bottom) / 2.0f, BULLET_RADIUS, p);
    108             }
    109 
    110             if (mWantColor) {
    111                 p.setColor(oldcolor);
    112             }
    113 
    114             p.setStyle(style);
    115         }
    116     }
    117 }
    118