01: /*
02: * The Unified Mapping Platform (JUMP) is an extensible, interactive GUI
03: * for visualizing and manipulating spatial features with geometry and attributes.
04: *
05: * Copyright (C) 2003 Vivid Solutions
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License
09: * as published by the Free Software Foundation; either version 2
10: * of the License, or (at your option) any later version.
11: *
12: * This program is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: * GNU General Public License for more details.
16: *
17: * You should have received a copy of the GNU General Public License
18: * along with this program; if not, write to the Free Software
19: * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20: *
21: * For more information, contact:
22: *
23: * Vivid Solutions
24: * Suite #1A
25: * 2328 Government Street
26: * Victoria BC V8T 5G5
27: * Canada
28: *
29: * (250)385-6040
30: * www.vividsolutions.com
31: */
32:
33: package com.vividsolutions.jump.workbench.ui;
34:
35: import java.util.ArrayList;
36:
37: import com.vividsolutions.jts.geom.Envelope;
38:
39: public class ZoomHistory {
40: private LayerViewPanel layerViewPanel;
41: private ArrayList envelopes = new ArrayList();
42: private int currentIndex = -1;
43: private boolean adding = true;
44:
45: public ZoomHistory(LayerViewPanel layerViewPanel) {
46: this .layerViewPanel = layerViewPanel;
47: }
48:
49: public void setAdding(boolean adding) {
50: this .adding = adding;
51: }
52:
53: public void add(Envelope envelope) {
54: if (!adding) {
55: return;
56: }
57:
58: envelopes.subList(currentIndex + 1, envelopes.size()).clear();
59: envelopes.add(envelope);
60: currentIndex = envelopes.size() - 1;
61: }
62:
63: public Envelope next() {
64: currentIndex++;
65:
66: return getCurrentEnvelope();
67: }
68:
69: public Envelope prev() {
70: currentIndex--;
71:
72: return getCurrentEnvelope();
73: }
74:
75: private Envelope getCurrentEnvelope() {
76: return (Envelope) envelopes.get(currentIndex);
77: }
78:
79: public boolean hasPrev() {
80: return currentIndex > 0;
81: }
82:
83: public boolean hasNext() {
84: return currentIndex < (envelopes.size() - 1);
85: }
86: }
|