Mercurial > dive4elements > river

comparison flys-client/src/main/java/de/intevation/flys/client/client/ui/chart/PanControl.java @ 551:13c7f90917fc

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Added a PanControl to pan charts. flys-client/trunk@2064 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 07 Jun 2011 13:07:27 +0000
parents
children c5fc3fa02edb
comparison
equal deleted inserted replaced
550:605debcbb6a0 551:13c7f90917fc
1 package de.intevation.flys.client.client.ui.chart;
2
3 import java.util.ArrayList;
4 import java.util.List;
5
6 import com.google.gwt.core.client.GWT;
7
8 import com.smartgwt.client.types.Overflow;
9 import com.smartgwt.client.types.SelectionType;
10 import com.smartgwt.client.widgets.Canvas;
11 import com.smartgwt.client.widgets.ImgButton;
12 import com.smartgwt.client.widgets.events.MouseDownEvent;
13 import com.smartgwt.client.widgets.events.MouseDownHandler;
14 import com.smartgwt.client.widgets.events.MouseMoveEvent;
15 import com.smartgwt.client.widgets.events.MouseMoveHandler;
16 import com.smartgwt.client.widgets.events.MouseOutEvent;
17 import com.smartgwt.client.widgets.events.MouseOutHandler;
18 import com.smartgwt.client.widgets.events.MouseUpEvent;
19 import com.smartgwt.client.widgets.events.MouseUpHandler;
20
21 import de.intevation.flys.client.client.event.HasPanHandlers;
22 import de.intevation.flys.client.client.event.PanEvent;
23 import de.intevation.flys.client.client.event.PanHandler;
24
25
26 /**
27 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
28 */
29 public class PanControl
30 extends ImgButton
31 implements MouseDownHandler, MouseMoveHandler, MouseUpHandler,
32 MouseOutHandler, HasPanHandlers
33 {
34 protected ChartOutputTab chartTab;
35
36 protected List<PanHandler> handlers;
37
38 protected int[] start;
39 protected int[] end;
40
41
42 public PanControl(ChartOutputTab chartTab, String imageUrl) {
43 super();
44
45 this.chartTab = chartTab;
46 this.handlers = new ArrayList<PanHandler>();
47 this.start = new int[] { -1, -1 };
48 this.end = new int[] { -1, -1 };
49
50 String baseUrl = GWT.getHostPageBaseURL();
51 setSrc(baseUrl + imageUrl);
52 setActionType(SelectionType.CHECKBOX);
53 setSize(20);
54 setShowRollOver(false);
55 setSelected(false);
56
57 chartTab.getChartPanel().addMouseDownHandler(this);
58 chartTab.getChartPanel().addMouseMoveHandler(this);
59 chartTab.getChartPanel().addMouseUpHandler(this);
60 chartTab.getChartPanel().addMouseOutHandler(this);
61 }
62
63
64 /**
65 * Method used to register a new PanHandler.
66 *
67 * @param handler A new PanHandler.
68 */
69 public void addPanHandler(PanHandler handler) {
70 if (handler != null) {
71 handlers.add(handler);
72 }
73 }
74
75
76 /**
77 * This event starts the dragging operation if the control is activated.
78 *
79 * @param event The mouse down event which contains the start coordinates.
80 */
81 public void onMouseDown(MouseDownEvent event) {
82 if (!isSelected()) {
83 return;
84 }
85
86 Canvas parent = chartTab.getChartPanel().getParentElement();
87 parent.setOverflow(Overflow.HIDDEN);
88
89 start[0] = event.getX();
90 start[1] = event.getY();
91
92 end[0] = start[0];
93 end[1] = start[1];
94 }
95
96
97 /**
98 * This event is used to reposition the chart image based on the current
99 * drag operation.
100 *
101 * @param event The move event which contains the new coordinates to update
102 * the chart image position.
103 */
104 public void onMouseMove(MouseMoveEvent event) {
105 if (!isSelected() || start[0] == -1 || start[1] == -1) {
106 return;
107 }
108
109 int x = event.getX() - end[0];
110 int y = event.getY() - end[1];
111
112 end[0] = end[0] + x;
113 end[1] = end[1] + y;
114
115 Canvas c = chartTab.getChartPanel();
116 c.moveBy(x, y);
117 }
118
119
120 /**
121 * This event stops the dragging operation and fires a DragEnd event to the
122 * registered listeners.
123 *
124 * @param event The mouse up event which contains the end coordinates.
125 */
126 public void onMouseUp(MouseUpEvent event) {
127 if (!isSelected()) {
128 return;
129 }
130
131 end[0] = event.getX();
132 end[1] = event.getY();
133
134 Canvas parent = chartTab.getChartPanel().getParentElement();
135 parent.setOverflow(Overflow.AUTO);
136
137 fireOnPan();
138
139 start[0] = -1;
140 start[1] = -1;
141 }
142
143
144 /**
145 * This event is used to cancel the current dragging operation.
146 *
147 * @param event The mouse out event.
148 */
149 public void onMouseOut(MouseOutEvent event) {
150 // TODO Cancel dragging if mouse pointer leaves chart area
151 }
152
153
154 /**
155 * A pan event is fired to inform the registered listeners about a pan
156 * operation has finished.
157 */
158 protected void fireOnPan() {
159 PanEvent event = new PanEvent(start, end);
160
161 for (PanHandler handler: handlers) {
162 handler.onPan(event);
163 }
164 }
165 }
166 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
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