source: josm/src/org/openstreetmap/josm/gui/MapStatus.java@ 56

Last change on this file since 56 was 56, checked in by imi, 19 years ago

hacked the ConcurrentModificationException again by widen the range of the try statement.
File size: 7.9 KB
Line 
1package org.openstreetmap.josm.gui;
2
3import java.awt.AWTEvent;
4import java.awt.Cursor;
5import java.awt.Font;
6import java.awt.GridBagLayout;
7import java.awt.Point;
8import java.awt.Toolkit;
9import java.awt.event.AWTEventListener;
10import java.awt.event.InputEvent;
11import java.awt.event.MouseAdapter;
12import java.awt.event.MouseEvent;
13import java.awt.event.MouseMotionListener;
14import java.beans.PropertyChangeEvent;
15import java.beans.PropertyChangeListener;
16import java.util.Collection;
17import java.util.ConcurrentModificationException;
18import java.util.Map.Entry;
19
20import javax.swing.BorderFactory;
21import javax.swing.BoxLayout;
22import javax.swing.JLabel;
23import javax.swing.JPanel;
24import javax.swing.JTextField;
25import javax.swing.Popup;
26import javax.swing.PopupFactory;
27
28import org.openstreetmap.josm.Main;
29import org.openstreetmap.josm.data.GeoPoint;
30import org.openstreetmap.josm.data.osm.Key;
31import org.openstreetmap.josm.data.osm.OsmPrimitive;
32import org.openstreetmap.josm.data.osm.visitor.SelectionComponentVisitor;
33
34/**
35 * A component that manages some status information display about the map.
36 * It keeps a status line below the map up to date and displays some tooltip
37 * information if the user hold the mouse long enough at some point.
38 *
39 * All this is done in background to not disturb other processes.
40 *
41 * The background thread does not alter any data of the map (read only thread).
42 * Also it is rather fail safe. In case of some error in the data, it just do
43 * nothing instead of whining and complaining.
44 *
45 * @author imi
46 */
47public class MapStatus extends JPanel {
48
49 /**
50 * The MapView this status belongs.
51 */
52 final MapView mv;
53 /**
54 * The position of the mouse cursor.
55 */
56 JTextField positionText = new JTextField("-000.00000000000000 -000.00000000000000".length());
57 /**
58 * The field holding the name of the object under the mouse.
59 */
60 JTextField nameText = new JTextField(30);
61
62 /**
63 * The collector class that waits for notification and then update
64 * the display objects.
65 *
66 * @author imi
67 */
68 private final class Collector implements Runnable {
69 /**
70 * The last object displayed in status line.
71 */
72 Collection<OsmPrimitive> osmStatus;
73 /**
74 * The old modifiers, that was pressed the last time this collector ran.
75 */
76 private int oldModifiers;
77 /**
78 * The popup displayed to show additional information
79 */
80 private Popup popup;
81 /**
82 * Signals the collector to shut down on next event.
83 */
84 boolean exitCollector = false;
85
86 /**
87 * Execution function for the Collector.
88 */
89 public void run() {
90 for (;;) {
91 MouseState ms = new MouseState();
92 synchronized (this) {
93 try {wait();} catch (InterruptedException e) {}
94 ms.modifiers = mouseState.modifiers;
95 ms.mousePos = mouseState.mousePos;
96 }
97 if (exitCollector)
98 return;
99 if ((ms.modifiers & MouseEvent.CTRL_DOWN_MASK) != 0 || ms.mousePos == null)
100 continue; // freeze display when holding down ctrl
101
102 // This try/catch is a hack to stop the flooding bug reports about this.
103 // The exception needed to handle with in the first place, means that this
104 // access to the data need to be restarted, if the main thread modifies
105 // the data.
106 try {
107 Collection<OsmPrimitive> osms = mv.getAllNearest(ms.mousePos);
108
109 if (osms == null && osmStatus == null && ms.modifiers == oldModifiers)
110 continue;
111 if (osms != null && osms.equals(osmStatus) && ms.modifiers == oldModifiers)
112 continue;
113
114 osmStatus = osms;
115 oldModifiers = ms.modifiers;
116
117 OsmPrimitive osmNearest = null;
118 // Set the text label in the bottom status bar
119 osmNearest = mv.getNearest(ms.mousePos, (ms.modifiers & MouseEvent.ALT_DOWN_MASK) != 0);
120 if (osmNearest != null) {
121 SelectionComponentVisitor visitor = new SelectionComponentVisitor();
122 osmNearest.visit(visitor);
123 nameText.setText(visitor.name);
124 } else
125 nameText.setText("");
126
127 // Popup Information
128 if ((ms.modifiers & MouseEvent.BUTTON2_DOWN_MASK) != 0 && osms != null) {
129 if (popup != null)
130 popup.hide();
131
132 JPanel c = new JPanel(new GridBagLayout());
133 for (final OsmPrimitive osm : osms) {
134 SelectionComponentVisitor visitor = new SelectionComponentVisitor();
135 osm.visit(visitor);
136 final StringBuilder text = new StringBuilder();
137 if (osm.id == 0 || osm.modified || osm.modifiedProperties)
138 visitor.name = "<i><b>"+visitor.name+"*</b></i>";
139 text.append(visitor.name);
140 if (osm.id != 0)
141 text.append("<br>id="+osm.id);
142 if (osm.keys != null)
143 for (Entry<Key, String> e : osm.keys.entrySet())
144 text.append("<br>"+e.getKey().name+"="+e.getValue());
145 final JLabel l = new JLabel("<html>"+text.toString()+"</html>", visitor.icon, JLabel.HORIZONTAL);
146 l.setFont(l.getFont().deriveFont(Font.PLAIN));
147 l.setVerticalTextPosition(JLabel.TOP);
148 l.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
149 l.addMouseListener(new MouseAdapter(){
150 @Override
151 public void mouseEntered(MouseEvent e) {
152 l.setText("<html><u color='blue'>"+text.toString()+"</u></html>");
153 }
154 @Override
155 public void mouseExited(MouseEvent e) {
156 l.setText("<html>"+text.toString()+"</html>");
157 }
158 @Override
159 public void mouseClicked(MouseEvent e) {
160 Main.main.ds.clearSelection();
161 osm.setSelected(true);
162 mv.repaint();
163 }
164 });
165 c.add(l, GBC.eol());
166 }
167
168 Point p = mv.getLocationOnScreen();
169 popup = PopupFactory.getSharedInstance().getPopup(mv, c, p.x+ms.mousePos.x+16, p.y+ms.mousePos.y+16);
170 popup.show();
171 } else if (popup != null) {
172 popup.hide();
173 popup = null;
174 }
175 } catch (ConcurrentModificationException x) {
176 }
177 }
178 }
179 }
180
181 /**
182 * Everything, the collector is interested of. Access must be synchronized.
183 * @author imi
184 */
185 class MouseState {
186 Point mousePos;
187 int modifiers;
188 }
189 /**
190 * The last sent mouse movement event.
191 */
192 MouseState mouseState = new MouseState();
193
194 /**
195 * Construct a new MapStatus and attach it to the map view.
196 * @param mv The MapView the status line is part of.
197 */
198 public MapStatus(final MapFrame mapFrame) {
199 this.mv = mapFrame.mapView;
200
201 // Listen for mouse movements and set the position text field
202 mv.addMouseMotionListener(new MouseMotionListener(){
203 public void mouseDragged(MouseEvent e) {
204 mouseMoved(e);
205 }
206 public void mouseMoved(MouseEvent e) {
207 // Do not update the view, if ctrl is pressed.
208 if ((e.getModifiersEx() & MouseEvent.CTRL_DOWN_MASK) == 0) {
209 GeoPoint p = mv.getPoint(e.getX(),e.getY(),true);
210 positionText.setText(p.lat+" "+p.lon);
211 }
212 }
213 });
214
215 positionText.setEditable(false);
216 nameText.setEditable(false);
217 setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
218 setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
219 add(new JLabel("Lat/Lon "));
220 add(positionText);
221 add(new JLabel(" Object "));
222 add(nameText);
223
224 // The background thread
225 final Collector collector = new Collector();
226 new Thread(collector).start();
227
228 // Listen to keyboard/mouse events for pressing/releasing alt key and
229 // inform the collector.
230 Toolkit.getDefaultToolkit().addAWTEventListener(new AWTEventListener(){
231 public void eventDispatched(AWTEvent event) {
232 synchronized (collector) {
233 mouseState.modifiers = ((InputEvent)event).getModifiersEx();
234 if (event instanceof MouseEvent)
235 mouseState.mousePos = ((MouseEvent)event).getPoint();
236 collector.notify();
237 }
238 }
239 }, AWTEvent.KEY_EVENT_MASK | AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK);
240
241 // listen for shutdowns to cancel the background thread
242 mapFrame.addPropertyChangeListener("visible", new PropertyChangeListener(){
243 public void propertyChange(PropertyChangeEvent evt) {
244 if (evt.getNewValue() == Boolean.FALSE) {
245 collector.exitCollector = true;
246 synchronized (collector) {
247 collector.notify();
248 }
249 }
250 }
251 });
252 }
253}
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