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