1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2013 Eric Lafortune (eric@graphics.cornell.edu)
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21package proguard.gui.splash;
22
23/**
24 * This VariableString produces a String that grows linearly with respect to its
25 * Timing, as if it is being written on a typewriter. A cursor at the end
26 * precedes the typed characters.
27 *
28 * @author Eric Lafortune
29 */
30public class TypeWriterString implements VariableString
31{
32    private final String string;
33    private final Timing timing;
34
35    private int    cachedLength = -1;
36    private String cachedString;
37
38
39    /**
40     * Creates a new TypeWriterString.
41     * @param string the basic String.
42     * @param timing the applied timing.
43     */
44    public TypeWriterString(String string, Timing timing)
45    {
46        this.string = string;
47        this.timing = timing;
48    }
49
50
51    // Implementation for VariableString.
52
53    public String getString(long time)
54    {
55        double t = timing.getTiming(time);
56
57        int stringLength = string.length();
58        int length = (int)(stringLength * t + 0.5);
59        if (length != cachedLength)
60        {
61            cachedLength = length;
62            cachedString = string.substring(0, length);
63            if (t > 0.0 && length < stringLength)
64            {
65                cachedString += "_";
66            }
67        }
68
69        return cachedString;
70    }
71}
72