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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.drawable.Drawable;
     20 import android.graphics.Paint;
     21 import android.graphics.Canvas;
     22 import android.graphics.RectF;
     23 import android.text.Spanned;
     24 import android.text.Layout;
     25 
     26 public class DrawableMarginSpan
     27 implements LeadingMarginSpan, LineHeightSpan
     28 {
     29     public DrawableMarginSpan(Drawable b) {
     30         mDrawable = b;
     31     }
     32 
     33     public DrawableMarginSpan(Drawable b, int pad) {
     34         mDrawable = b;
     35         mPad = pad;
     36     }
     37 
     38     public int getLeadingMargin(boolean first) {
     39         return mDrawable.getIntrinsicWidth() + mPad;
     40     }
     41 
     42     public void drawLeadingMargin(Canvas c, Paint p, int x, int dir,
     43                                   int top, int baseline, int bottom,
     44                                   CharSequence text, int start, int end,
     45                                   boolean first, Layout layout) {
     46         int st = ((Spanned) text).getSpanStart(this);
     47         int ix = (int)x;
     48         int itop = (int)layout.getLineTop(layout.getLineForOffset(st));
     49 
     50         int dw = mDrawable.getIntrinsicWidth();
     51         int dh = mDrawable.getIntrinsicHeight();
     52 
     53         if (dir < 0)
     54             x -= dw;
     55 
     56         // XXX What to do about Paint?
     57         mDrawable.setBounds(ix, itop, ix+dw, itop+dh);
     58         mDrawable.draw(c);
     59     }
     60 
     61     public void chooseHeight(CharSequence text, int start, int end,
     62                              int istartv, int v,
     63                              Paint.FontMetricsInt fm) {
     64         if (end == ((Spanned) text).getSpanEnd(this)) {
     65             int ht = mDrawable.getIntrinsicHeight();
     66 
     67             int need = ht - (v + fm.descent - fm.ascent - istartv);
     68             if (need > 0)
     69                 fm.descent += need;
     70 
     71             need = ht - (v + fm.bottom - fm.top - istartv);
     72             if (need > 0)
     73                 fm.bottom += need;
     74         }
     75     }
     76 
     77     private Drawable mDrawable;
     78     private int mPad;
     79 }
     80