001// License: GPL. For details, see LICENSE file. 002package org.openstreetmap.josm.gui; 003 004import static org.openstreetmap.josm.tools.I18n.tr; 005 006import java.awt.BasicStroke; 007import java.awt.Color; 008import java.awt.Component; 009import java.awt.Container; 010import java.awt.Dimension; 011import java.awt.Graphics; 012import java.awt.Graphics2D; 013import java.awt.Insets; 014import java.awt.Point; 015import java.awt.RenderingHints; 016import java.awt.Shape; 017import java.awt.event.ActionEvent; 018import java.awt.event.ActionListener; 019import java.awt.event.MouseAdapter; 020import java.awt.event.MouseEvent; 021import java.awt.event.MouseListener; 022import java.awt.geom.RoundRectangle2D; 023import java.util.LinkedList; 024import java.util.Queue; 025 026import javax.swing.AbstractAction; 027import javax.swing.BorderFactory; 028import javax.swing.GroupLayout; 029import javax.swing.JButton; 030import javax.swing.JFrame; 031import javax.swing.JLabel; 032import javax.swing.JLayeredPane; 033import javax.swing.JPanel; 034import javax.swing.JToolBar; 035import javax.swing.SwingUtilities; 036import javax.swing.Timer; 037 038import org.openstreetmap.josm.Main; 039import org.openstreetmap.josm.data.preferences.IntegerProperty; 040import org.openstreetmap.josm.gui.help.HelpBrowser; 041import org.openstreetmap.josm.gui.help.HelpUtil; 042import org.openstreetmap.josm.tools.ImageProvider; 043 044/** 045 * Manages {@link Notification}s, i.e. displays them on screen. 046 * 047 * Don't use this class directly, but use {@link Notification#show()}. 048 * 049 * If multiple messages are sent in a short period of time, they are put in 050 * a queue and displayed one after the other. 051 * 052 * The user can stop the timer (freeze the message) by moving the mouse cursor 053 * above the panel. As a visual cue, the background color changes from 054 * semi-transparent to opaque while the timer is frozen. 055 */ 056class NotificationManager { 057 058 private final Timer hideTimer; // started when message is shown, responsible for hiding the message 059 private final Timer pauseTimer; // makes sure, there is a small pause between two consecutive messages 060 private final Timer unfreezeDelayTimer; // tiny delay before resuming the timer when mouse cursor is moved off the panel 061 private boolean running; 062 063 private Notification currentNotification; 064 private NotificationPanel currentNotificationPanel; 065 private final Queue<Notification> queue; 066 067 private static IntegerProperty pauseTime = new IntegerProperty("notification-default-pause-time-ms", 300); // milliseconds 068 069 private long displayTimeStart; 070 private long elapsedTime; 071 072 private static NotificationManager instance; 073 074 private static final Color PANEL_SEMITRANSPARENT = new Color(224, 236, 249, 230); 075 private static final Color PANEL_OPAQUE = new Color(224, 236, 249); 076 077 NotificationManager() { 078 queue = new LinkedList<>(); 079 hideTimer = new Timer(Notification.TIME_DEFAULT, e -> this.stopHideTimer()); 080 hideTimer.setRepeats(false); 081 pauseTimer = new Timer(pauseTime.get(), new PauseFinishedEvent()); 082 pauseTimer.setRepeats(false); 083 unfreezeDelayTimer = new Timer(10, new UnfreezeEvent()); 084 unfreezeDelayTimer.setRepeats(false); 085 } 086 087 /** 088 * Show the given notification 089 * @param note The note to show. 090 * @see Notification#show() 091 */ 092 public void showNotification(Notification note) { 093 synchronized (queue) { 094 queue.add(note); 095 processQueue(); 096 } 097 } 098 099 private void processQueue() { 100 if (running) return; 101 102 currentNotification = queue.poll(); 103 if (currentNotification == null) return; 104 105 currentNotificationPanel = new NotificationPanel(currentNotification, new FreezeMouseListener(), e -> this.stopHideTimer()); 106 currentNotificationPanel.validate(); 107 108 int margin = 5; 109 JFrame parentWindow = (JFrame) Main.parent; 110 Dimension size = currentNotificationPanel.getPreferredSize(); 111 if (parentWindow != null) { 112 int x; 113 int y; 114 if (Main.isDisplayingMapView() && Main.map.mapView.getHeight() > 0) { 115 MapView mv = Main.map.mapView; 116 Point mapViewPos = SwingUtilities.convertPoint(mv.getParent(), mv.getX(), mv.getY(), Main.parent); 117 x = mapViewPos.x + margin; 118 y = mapViewPos.y + mv.getHeight() - Main.map.statusLine.getHeight() - size.height - margin; 119 } else { 120 x = margin; 121 y = parentWindow.getHeight() - Main.toolbar.control.getSize().height - size.height - margin; 122 } 123 parentWindow.getLayeredPane().add(currentNotificationPanel, JLayeredPane.POPUP_LAYER, 0); 124 125 currentNotificationPanel.setLocation(x, y); 126 } 127 currentNotificationPanel.setSize(size); 128 129 currentNotificationPanel.setVisible(true); 130 131 running = true; 132 elapsedTime = 0; 133 134 startHideTimer(); 135 } 136 137 private void startHideTimer() { 138 int remaining = (int) (currentNotification.getDuration() - elapsedTime); 139 if (remaining < 300) { 140 remaining = 300; 141 } 142 displayTimeStart = System.currentTimeMillis(); 143 hideTimer.setInitialDelay(remaining); 144 hideTimer.restart(); 145 } 146 147 private void stopHideTimer() { 148 hideTimer.stop(); 149 if (currentNotificationPanel != null) { 150 currentNotificationPanel.setVisible(false); 151 JFrame parent = (JFrame) Main.parent; 152 if (parent != null) { 153 parent.getLayeredPane().remove(currentNotificationPanel); 154 } 155 currentNotificationPanel = null; 156 } 157 pauseTimer.restart(); 158 } 159 160 private class PauseFinishedEvent implements ActionListener { 161 162 @Override 163 public void actionPerformed(ActionEvent e) { 164 synchronized (queue) { 165 running = false; 166 processQueue(); 167 } 168 } 169 } 170 171 private class UnfreezeEvent implements ActionListener { 172 173 @Override 174 public void actionPerformed(ActionEvent e) { 175 if (currentNotificationPanel != null) { 176 currentNotificationPanel.setNotificationBackground(PANEL_SEMITRANSPARENT); 177 currentNotificationPanel.repaint(); 178 } 179 startHideTimer(); 180 } 181 } 182 183 private static class NotificationPanel extends JPanel { 184 185 private JPanel innerPanel; 186 187 NotificationPanel(Notification note, MouseListener freeze, ActionListener hideListener) { 188 setVisible(false); 189 build(note, freeze, hideListener); 190 } 191 192 public void setNotificationBackground(Color c) { 193 innerPanel.setBackground(c); 194 } 195 196 private void build(final Notification note, MouseListener freeze, ActionListener hideListener) { 197 JButton btnClose = new JButton(); 198 btnClose.addActionListener(hideListener); 199 btnClose.setIcon(ImageProvider.get("misc", "grey_x")); 200 btnClose.setPreferredSize(new Dimension(50, 50)); 201 btnClose.setMargin(new Insets(0, 0, 1, 1)); 202 btnClose.setContentAreaFilled(false); 203 // put it in JToolBar to get a better appearance 204 JToolBar tbClose = new JToolBar(); 205 tbClose.setFloatable(false); 206 tbClose.setBorderPainted(false); 207 tbClose.setOpaque(false); 208 tbClose.add(btnClose); 209 210 JToolBar tbHelp = null; 211 if (note.getHelpTopic() != null) { 212 JButton btnHelp = new JButton(tr("Help")); 213 btnHelp.setIcon(ImageProvider.get("help")); 214 btnHelp.setToolTipText(tr("Show help information")); 215 HelpUtil.setHelpContext(btnHelp, note.getHelpTopic()); 216 btnHelp.addActionListener(new AbstractAction() { 217 @Override 218 public void actionPerformed(ActionEvent e) { 219 SwingUtilities.invokeLater(() -> HelpBrowser.setUrlForHelpTopic(note.getHelpTopic())); 220 } 221 }); 222 btnHelp.setOpaque(false); 223 tbHelp = new JToolBar(); 224 tbHelp.setFloatable(false); 225 tbHelp.setBorderPainted(false); 226 tbHelp.setOpaque(false); 227 tbHelp.add(btnHelp); 228 } 229 230 setOpaque(false); 231 innerPanel = new RoundedPanel(); 232 innerPanel.setBackground(PANEL_SEMITRANSPARENT); 233 innerPanel.setForeground(Color.BLACK); 234 235 GroupLayout layout = new GroupLayout(innerPanel); 236 innerPanel.setLayout(layout); 237 layout.setAutoCreateGaps(true); 238 layout.setAutoCreateContainerGaps(true); 239 240 innerPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5)); 241 add(innerPanel); 242 243 JLabel icon = null; 244 if (note.getIcon() != null) { 245 icon = new JLabel(note.getIcon()); 246 } 247 Component content = note.getContent(); 248 GroupLayout.SequentialGroup hgroup = layout.createSequentialGroup(); 249 if (icon != null) { 250 hgroup.addComponent(icon); 251 } 252 if (tbHelp != null) { 253 hgroup.addGroup(layout.createParallelGroup(GroupLayout.Alignment.TRAILING) 254 .addComponent(content) 255 .addComponent(tbHelp) 256 ); 257 } else { 258 hgroup.addComponent(content); 259 } 260 hgroup.addComponent(tbClose); 261 GroupLayout.ParallelGroup vgroup = layout.createParallelGroup(); 262 if (icon != null) { 263 vgroup.addComponent(icon); 264 } 265 vgroup.addComponent(content); 266 vgroup.addComponent(tbClose); 267 layout.setHorizontalGroup(hgroup); 268 269 if (tbHelp != null) { 270 layout.setVerticalGroup(layout.createSequentialGroup() 271 .addGroup(vgroup) 272 .addComponent(tbHelp) 273 ); 274 } else { 275 layout.setVerticalGroup(vgroup); 276 } 277 278 /* 279 * The timer stops when the mouse cursor is above the panel. 280 * 281 * This is not straightforward, because the JPanel will get a 282 * mouseExited event when the cursor moves on top of the JButton 283 * inside the panel. 284 * 285 * The current hacky solution is to register the freeze MouseListener 286 * not only to the panel, but to all the components inside the panel. 287 * 288 * Moving the mouse cursor from one component to the next would 289 * cause some flickering (timer is started and stopped for a fraction 290 * of a second, background color is switched twice), so there is 291 * a tiny delay before the timer really resumes. 292 */ 293 addMouseListenerToAllChildComponents(this, freeze); 294 } 295 296 private static void addMouseListenerToAllChildComponents(Component comp, MouseListener listener) { 297 comp.addMouseListener(listener); 298 if (comp instanceof Container) { 299 for (Component c: ((Container) comp).getComponents()) { 300 addMouseListenerToAllChildComponents(c, listener); 301 } 302 } 303 } 304 } 305 306 class FreezeMouseListener extends MouseAdapter { 307 @Override 308 public void mouseEntered(MouseEvent e) { 309 if (unfreezeDelayTimer.isRunning()) { 310 unfreezeDelayTimer.stop(); 311 } else { 312 hideTimer.stop(); 313 elapsedTime += System.currentTimeMillis() - displayTimeStart; 314 currentNotificationPanel.setNotificationBackground(PANEL_OPAQUE); 315 currentNotificationPanel.repaint(); 316 } 317 } 318 319 @Override 320 public void mouseExited(MouseEvent e) { 321 unfreezeDelayTimer.restart(); 322 } 323 } 324 325 /** 326 * A panel with rounded edges and line border. 327 */ 328 public static class RoundedPanel extends JPanel { 329 330 RoundedPanel() { 331 super(); 332 setOpaque(false); 333 } 334 335 @Override 336 protected void paintComponent(Graphics graphics) { 337 Graphics2D g = (Graphics2D) graphics; 338 g.setRenderingHint( 339 RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); 340 g.setColor(getBackground()); 341 float lineWidth = 1.4f; 342 Shape rect = new RoundRectangle2D.Double( 343 lineWidth/2d + getInsets().left, 344 lineWidth/2d + getInsets().top, 345 getWidth() - lineWidth/2d - getInsets().left - getInsets().right, 346 getHeight() - lineWidth/2d - getInsets().top - getInsets().bottom, 347 20, 20); 348 349 g.fill(rect); 350 g.setColor(getForeground()); 351 g.setStroke(new BasicStroke(lineWidth)); 352 g.draw(rect); 353 super.paintComponent(graphics); 354 } 355 } 356 357 public static synchronized NotificationManager getInstance() { 358 if (instance == null) { 359 instance = new NotificationManager(); 360 } 361 return instance; 362 } 363}