| 1 | // License: GPL. Copyright 2007 by Immanuel Scholz and others
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| 2 | package org.openstreetmap.josm.gui;
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| 3 |
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| 4 | import static org.openstreetmap.josm.tools.I18n.tr;
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| 5 |
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| 6 | import java.awt.AWTEvent;
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| 7 | import java.awt.Cursor;
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| 8 | import java.awt.EventQueue;
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| 9 | import java.awt.Font;
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| 10 | import java.awt.GridBagLayout;
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| 11 | import java.awt.Point;
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| 12 | import java.awt.Toolkit;
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| 13 | import java.awt.event.AWTEventListener;
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| 14 | import java.awt.event.InputEvent;
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| 15 | import java.awt.event.MouseAdapter;
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| 16 | import java.awt.event.MouseEvent;
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| 17 | import java.awt.event.MouseMotionListener;
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| 18 | import java.lang.reflect.InvocationTargetException;
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| 19 | import java.util.Collection;
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| 20 | import java.util.ConcurrentModificationException;
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| 21 | import java.util.Map.Entry;
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| 22 |
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| 23 | import javax.swing.BorderFactory;
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| 24 | import javax.swing.BoxLayout;
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| 25 | import javax.swing.JLabel;
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| 26 | import javax.swing.JPanel;
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| 27 | import javax.swing.JTextField;
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| 28 | import javax.swing.Popup;
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| 29 | import javax.swing.PopupFactory;
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| 30 |
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| 31 | import org.openstreetmap.josm.Main;
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| 32 | import org.openstreetmap.josm.actions.HelpAction.Helpful;
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| 33 | import org.openstreetmap.josm.data.coor.LatLon;
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| 34 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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| 35 | import org.openstreetmap.josm.data.osm.visitor.NameVisitor;
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| 36 | import org.openstreetmap.josm.tools.GBC;
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| 37 |
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| 38 | /**
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| 39 | * A component that manages some status information display about the map.
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| 40 | * It keeps a status line below the map up to date and displays some tooltip
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| 41 | * information if the user hold the mouse long enough at some point.
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| 42 | *
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| 43 | * All this is done in background to not disturb other processes.
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| 44 | *
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| 45 | * The background thread does not alter any data of the map (read only thread).
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| 46 | * Also it is rather fail safe. In case of some error in the data, it just do
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| 47 | * nothing instead of whining and complaining.
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| 48 | *
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| 49 | * @author imi
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| 50 | */
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| 51 | public class MapStatus extends JPanel implements Helpful {
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| 52 |
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| 53 | /**
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| 54 | * The MapView this status belongs.
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| 55 | */
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| 56 | final MapView mv;
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| 57 | /**
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| 58 | * The position of the mouse cursor.
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| 59 | */
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| 60 | JTextField positionText = new JTextField("-000.00000000000000 -000.00000000000000".length());
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| 61 | /**
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| 62 | * The field holding the name of the object under the mouse.
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| 63 | */
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| 64 | JTextField nameText = new JTextField(30);
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| 65 |
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| 66 | /**
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| 67 | * The collector class that waits for notification and then update
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| 68 | * the display objects.
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| 69 | *
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| 70 | * @author imi
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| 71 | */
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| 72 | private final class Collector implements Runnable {
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| 73 | /**
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| 74 | * The last object displayed in status line.
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| 75 | */
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| 76 | Collection<OsmPrimitive> osmStatus;
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| 77 | /**
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| 78 | * The old modifiers, that was pressed the last time this collector ran.
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| 79 | */
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| 80 | private int oldModifiers;
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| 81 | /**
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| 82 | * The popup displayed to show additional information
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| 83 | */
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| 84 | private Popup popup;
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| 85 |
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| 86 | private MapFrame parent;
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| 87 |
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| 88 | public Collector(MapFrame parent) {
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| 89 | this.parent = parent;
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| 90 | }
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| 91 |
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| 92 | /**
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| 93 | * Execution function for the Collector.
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| 94 | */
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| 95 | public void run() {
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| 96 | for (;;) {
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| 97 | MouseState ms = new MouseState();
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| 98 | synchronized (this) {
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| 99 | try {wait();} catch (InterruptedException e) {}
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| 100 | ms.modifiers = mouseState.modifiers;
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| 101 | ms.mousePos = mouseState.mousePos;
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| 102 | }
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| 103 | if (parent != Main.map)
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| 104 | return; // exit, if new parent.
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| 105 | if ((ms.modifiers & MouseEvent.CTRL_DOWN_MASK) != 0 || ms.mousePos == null)
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| 106 | continue; // freeze display when holding down ctrl
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| 107 |
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| 108 | if (mv.center == null)
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| 109 | continue;
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| 110 |
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| 111 | // This try/catch is a hack to stop the flooding bug reports about this.
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| 112 | // The exception needed to handle with in the first place, means that this
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| 113 | // access to the data need to be restarted, if the main thread modifies
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| 114 | // the data.
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| 115 | try {
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| 116 | Collection<OsmPrimitive> osms = mv.getAllNearest(ms.mousePos);
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| 117 |
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| 118 | if (osms == null && osmStatus == null && ms.modifiers == oldModifiers)
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| 119 | continue;
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| 120 | if (osms != null && osms.equals(osmStatus) && ms.modifiers == oldModifiers)
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| 121 | continue;
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| 122 |
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| 123 | osmStatus = osms;
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| 124 | oldModifiers = ms.modifiers;
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| 125 |
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| 126 | OsmPrimitive osmNearest = null;
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| 127 | // Set the text label in the bottom status bar
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| 128 | osmNearest = mv.getNearest(ms.mousePos, (ms.modifiers & MouseEvent.ALT_DOWN_MASK) != 0);
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| 129 | if (osmNearest != null) {
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| 130 | NameVisitor visitor = new NameVisitor();
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| 131 | osmNearest.visit(visitor);
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| 132 | nameText.setText(visitor.name);
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| 133 | } else
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| 134 | nameText.setText("");
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| 135 |
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| 136 | // Popup Information
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| 137 | if ((ms.modifiers & MouseEvent.BUTTON2_DOWN_MASK) != 0 && osms != null) {
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| 138 | if (popup != null) {
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| 139 | try {
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| 140 | EventQueue.invokeAndWait(new Runnable() {
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| 141 | public void run() {
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| 142 | popup.hide();
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| 143 | }
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| 144 | });
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| 145 | } catch (InterruptedException e) {
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| 146 | } catch (InvocationTargetException e) {
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| 147 | throw new RuntimeException(e);
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| 148 | }
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| 149 | }
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| 150 |
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| 151 | JPanel c = new JPanel(new GridBagLayout());
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| 152 | for (final OsmPrimitive osm : osms) {
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| 153 | NameVisitor visitor = new NameVisitor();
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| 154 | osm.visit(visitor);
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| 155 | final StringBuilder text = new StringBuilder();
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| 156 | if (osm.id == 0 || osm.modified)
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| 157 | visitor.name = "<i><b>"+visitor.name+"*</b></i>";
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| 158 | text.append(visitor.name);
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| 159 | if (osm.id != 0)
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| 160 | text.append("<br>id="+osm.id);
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| 161 | for (Entry<String, String> e : osm.entrySet())
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| 162 | text.append("<br>"+e.getKey()+"="+e.getValue());
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| 163 | final JLabel l = new JLabel("<html>"+text.toString()+"</html>", visitor.icon, JLabel.HORIZONTAL);
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| 164 | l.setFont(l.getFont().deriveFont(Font.PLAIN));
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| 165 | l.setVerticalTextPosition(JLabel.TOP);
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| 166 | l.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
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| 167 | l.addMouseListener(new MouseAdapter(){
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| 168 | @Override public void mouseEntered(MouseEvent e) {
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| 169 | l.setText("<html><u color='blue'>"+text.toString()+"</u></html>");
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| 170 | }
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| 171 | @Override public void mouseExited(MouseEvent e) {
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| 172 | l.setText("<html>"+text.toString()+"</html>");
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| 173 | }
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| 174 | @Override public void mouseClicked(MouseEvent e) {
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| 175 | Main.ds.setSelected(osm);
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| 176 | mv.repaint();
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| 177 | }
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| 178 | });
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| 179 | c.add(l, GBC.eol());
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| 180 | }
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| 181 |
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| 182 | Point p = mv.getLocationOnScreen();
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| 183 | popup = PopupFactory.getSharedInstance().getPopup(mv, c, p.x+ms.mousePos.x+16, p.y+ms.mousePos.y+16);
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| 184 | final Popup staticPopup = popup;
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| 185 | EventQueue.invokeLater(new Runnable(){
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| 186 | public void run() {
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| 187 | staticPopup.show();
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| 188 | }
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| 189 | });
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| 190 | } else if (popup != null) {
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| 191 | final Popup staticPopup = popup;
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| 192 | popup = null;
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| 193 | EventQueue.invokeLater(new Runnable(){
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| 194 | public void run() {
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| 195 | staticPopup.hide();
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| 196 | }
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| 197 | });
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| 198 | }
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| 199 | } catch (ConcurrentModificationException x) {
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| 200 | } catch (NullPointerException x) {
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| 201 | }
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| 202 | }
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| 203 | }
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| 204 | }
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| 205 |
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| 206 | /**
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| 207 | * Everything, the collector is interested of. Access must be synchronized.
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| 208 | * @author imi
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| 209 | */
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| 210 | class MouseState {
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| 211 | Point mousePos;
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| 212 | int modifiers;
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| 213 | }
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| 214 | /**
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| 215 | * The last sent mouse movement event.
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| 216 | */
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| 217 | MouseState mouseState = new MouseState();
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| 218 |
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| 219 | /**
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| 220 | * Construct a new MapStatus and attach it to the map view.
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| 221 | * @param mv The MapView the status line is part of.
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| 222 | */
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| 223 | public MapStatus(final MapFrame mapFrame) {
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| 224 | this.mv = mapFrame.mapView;
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| 225 |
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| 226 | // Listen for mouse movements and set the position text field
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| 227 | mv.addMouseMotionListener(new MouseMotionListener(){
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| 228 | public void mouseDragged(MouseEvent e) {
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| 229 | mouseMoved(e);
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| 230 | }
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| 231 | public void mouseMoved(MouseEvent e) {
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| 232 | if (mv.center == null)
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| 233 | return;
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| 234 | // Do not update the view, if ctrl is pressed.
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| 235 | if ((e.getModifiersEx() & MouseEvent.CTRL_DOWN_MASK) == 0) {
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| 236 | LatLon p = mv.getLatLon(e.getX(),e.getY());
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| 237 | positionText.setText(p.lat()+" "+p.lon());
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| 238 | }
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| 239 | }
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| 240 | });
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| 241 |
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| 242 | positionText.setEditable(false);
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| 243 | nameText.setEditable(false);
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| 244 | setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
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| 245 | setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
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| 246 | add(new JLabel(tr("Lat/Lon")+" "));
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| 247 | add(positionText);
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| 248 | add(new JLabel(" "+tr("Object")+" "));
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| 249 | add(nameText);
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| 250 |
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| 251 | // The background thread
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| 252 | final Collector collector = new Collector(mapFrame);
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| 253 | new Thread(collector).start();
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| 254 |
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| 255 | // Listen to keyboard/mouse events for pressing/releasing alt key and
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| 256 | // inform the collector.
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| 257 | Toolkit.getDefaultToolkit().addAWTEventListener(new AWTEventListener(){
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| 258 | public void eventDispatched(AWTEvent event) {
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| 259 | synchronized (collector) {
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| 260 | mouseState.modifiers = ((InputEvent)event).getModifiersEx();
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| 261 | if (event instanceof MouseEvent)
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| 262 | mouseState.mousePos = ((MouseEvent)event).getPoint();
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| 263 | collector.notify();
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| 264 | }
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| 265 | }
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| 266 | }, AWTEvent.KEY_EVENT_MASK | AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK);
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| 267 | }
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| 268 |
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| 269 | public String helpTopic() {
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| 270 | return "Statusline";
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| 271 | }
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| 272 | }
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