1 package com.android.ex.chips.recipientchip; 2 3 import android.graphics.Canvas; 4 import android.graphics.Paint; 5 import android.graphics.Rect; 6 import android.graphics.drawable.Drawable; 7 import android.text.style.ReplacementSpan; 8 9 /** 10 * ReplacementSpan that properly draws the drawable that is centered around the text 11 * without changing the default text size or layout. 12 */ 13 public class ReplacementDrawableSpan extends ReplacementSpan { 14 protected static final Paint sWorkPaint = new Paint(); 15 16 protected Drawable mDrawable; 17 private float mExtraMargin; 18 19 public ReplacementDrawableSpan(Drawable drawable) { 20 super(); 21 mDrawable = drawable; 22 } 23 24 public void setExtraMargin(float margin) { 25 mExtraMargin = margin; 26 } 27 28 private void setupFontMetrics(Paint.FontMetricsInt fm, Paint paint) { 29 sWorkPaint.set(paint); 30 if (fm != null) { 31 sWorkPaint.getFontMetricsInt(fm); 32 33 final Rect bounds = getBounds(); 34 final int textHeight = fm.descent - fm.ascent; 35 final int halfMargin = (int) mExtraMargin / 2; 36 fm.ascent = Math.min(fm.top, fm.top + (textHeight - bounds.bottom) / 2) - halfMargin; 37 fm.descent = Math.max(fm.bottom, fm.bottom + (bounds.bottom - textHeight) / 2) 38 + halfMargin; 39 fm.top = fm.ascent; 40 fm.bottom = fm.descent; 41 } 42 } 43 44 @Override 45 public int getSize(Paint paint, CharSequence text, int i, int i2, Paint.FontMetricsInt fm) { 46 setupFontMetrics(fm, paint); 47 return getBounds().right; 48 } 49 50 @Override 51 public void draw(Canvas canvas, CharSequence charSequence, int start, int end, float x, int top, 52 int y, int bottom, Paint paint) { 53 canvas.save(); 54 int transY = (bottom - mDrawable.getBounds().bottom + top) / 2; 55 canvas.translate(x, transY); 56 mDrawable.draw(canvas); 57 canvas.restore(); 58 } 59 60 protected Rect getBounds() { 61 return mDrawable.getBounds(); 62 } 63 } 64
