IconMarginSpan.java revision 4037d51b132a85dcfe37a95f9d2d91ad23d162fd 
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
17package android.text.style;
18
19import android.graphics.Bitmap;
20import android.graphics.Canvas;
21import android.graphics.Paint;
22import android.text.Layout;
23import android.text.Spanned;
24
25public class IconMarginSpan
26implements LeadingMarginSpan, LineHeightSpan
27{
28    public IconMarginSpan(Bitmap b) {
29        mBitmap = b;
30    }
31
32    public IconMarginSpan(Bitmap b, int pad) {
33        mBitmap = b;
34        mPad = pad;
35    }
36
37    public int getLeadingMargin(boolean first) {
38        return mBitmap.getWidth() + mPad;
39    }
40
41    public void drawLeadingMargin(Canvas c, Paint p, int x, int dir,
42                                  int top, int baseline, int bottom,
43                                  CharSequence text, int start, int end,
44                                  boolean first, Layout layout) {
45        int st = ((Spanned) text).getSpanStart(this);
46        int itop = layout.getLineTop(layout.getLineForOffset(st));
47
48        if (dir < 0)
49            x -= mBitmap.getWidth();
50
51        c.drawBitmap(mBitmap, x, itop, p);
52    }
53
54    public void chooseHeight(CharSequence text, int start, int end,
55                             int istartv, int v,
56                             Paint.FontMetricsInt fm) {
57        if (end == ((Spanned) text).getSpanEnd(this)) {
58            int ht = mBitmap.getHeight();
59
60            int need = ht - (v + fm.descent - fm.ascent - istartv);
61            if (need > 0)
62                fm.descent += need;
63
64            need = ht - (v + fm.bottom - fm.top - istartv);
65            if (need > 0)
66                fm.bottom += need;
67        }
68    }
69
70    private Bitmap mBitmap;
71    private int mPad;
72}
73