01: /*
02: * ProGuard -- shrinking, optimization, obfuscation, and preverification
03: * of Java bytecode.
04: *
05: * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
06: *
07: * This program is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU General Public License as published by the Free
09: * 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: */
21: package 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: */
30: public class TypeWriterString implements VariableString {
31: private final String string;
32: private final Timing timing;
33:
34: private int cachedLength = -1;
35: private String cachedString;
36:
37: /**
38: * Creates a new TypeWriterString.
39: * @param string the basic String.
40: * @param timing the applied timing.
41: */
42: public TypeWriterString(String string, Timing timing) {
43: this .string = string;
44: this .timing = timing;
45: }
46:
47: // Implementation for VariableString.
48:
49: public String getString(long time) {
50: double t = timing.getTiming(time);
51:
52: int stringLength = string.length();
53: int length = (int) (stringLength * t + 0.5);
54: if (length != cachedLength) {
55: cachedLength = length;
56: cachedString = string.substring(0, length);
57: if (t > 0.0 && length < stringLength) {
58: cachedString += "_";
59: }
60: }
61:
62: return cachedString;
63: }
64: }
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