1 | // License: GPL. For details, see LICENSE file.
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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.Cursor;
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7 | import java.awt.Point;
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8 | import java.awt.event.ActionEvent;
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9 | import java.awt.event.KeyEvent;
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10 | import java.awt.event.MouseAdapter;
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11 | import java.awt.event.MouseEvent;
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12 | import java.awt.event.MouseWheelEvent;
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13 | import java.util.ArrayList;
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14 | import java.util.Optional;
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15 |
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16 | import javax.swing.AbstractAction;
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17 |
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18 | import org.openstreetmap.gui.jmapviewer.JMapViewer;
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19 | import org.openstreetmap.josm.Main;
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20 | import org.openstreetmap.josm.actions.mapmode.SelectAction;
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21 | import org.openstreetmap.josm.data.Preferences.PreferenceChangeEvent;
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22 | import org.openstreetmap.josm.data.Preferences.PreferenceChangedListener;
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23 | import org.openstreetmap.josm.data.coor.EastNorth;
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24 | import org.openstreetmap.josm.data.preferences.BooleanProperty;
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25 | import org.openstreetmap.josm.gui.MapViewState.MapViewPoint;
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26 | import org.openstreetmap.josm.tools.Destroyable;
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27 | import org.openstreetmap.josm.tools.Pair;
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28 | import org.openstreetmap.josm.tools.Shortcut;
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29 |
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30 | /**
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31 | * Enables moving of the map by holding down the right mouse button and drag
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32 | * the mouse. Also, enables zooming by the mouse wheel.
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33 | *
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34 | * @author imi
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35 | */
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36 | public class MapMover extends MouseAdapter implements Destroyable {
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37 |
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38 | /**
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39 | * Zoom wheel is reversed.
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40 | */
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41 | public static final BooleanProperty PROP_ZOOM_REVERSE_WHEEL = new BooleanProperty("zoom.reverse-wheel", false);
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42 |
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43 | static {
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44 | new JMapViewerUpdater();
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45 | }
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46 |
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47 | private static class JMapViewerUpdater implements PreferenceChangedListener {
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48 |
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49 | JMapViewerUpdater() {
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50 | Main.pref.addPreferenceChangeListener(this);
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51 | updateJMapViewer();
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52 | }
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53 |
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54 | @Override
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55 | public void preferenceChanged(PreferenceChangeEvent e) {
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56 | if (MapMover.PROP_ZOOM_REVERSE_WHEEL.getKey().equals(e.getKey())) {
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57 | updateJMapViewer();
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58 | }
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59 | }
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60 |
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61 | private static void updateJMapViewer() {
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62 | JMapViewer.zoomReverseWheel = MapMover.PROP_ZOOM_REVERSE_WHEEL.get();
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63 | }
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64 | }
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65 |
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66 | private final class ZoomerAction extends AbstractAction {
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67 | private final String action;
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68 |
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69 | ZoomerAction(String action) {
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70 | this(action, "MapMover.Zoomer." + action);
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71 | }
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72 |
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73 | ZoomerAction(String action, String name) {
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74 | this.action = action;
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75 | putValue(NAME, name);
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76 | }
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77 |
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78 | @Override
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79 | public void actionPerformed(ActionEvent e) {
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80 | if (".".equals(action) || ",".equals(action)) {
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81 | Point mouse = Optional.ofNullable(nc.getMousePosition()).orElseGet(
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82 | () -> new Point((int) nc.getBounds().getCenterX(), (int) nc.getBounds().getCenterY()));
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83 | mouseWheelMoved(new MouseWheelEvent(nc, e.getID(), e.getWhen(), e.getModifiers(), mouse.x, mouse.y, 0, false,
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84 | MouseWheelEvent.WHEEL_UNIT_SCROLL, 1, ",".equals(action) ? -1 : 1));
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85 | } else {
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86 | EastNorth center = nc.getCenter();
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87 | EastNorth newcenter = nc.getEastNorth(nc.getWidth()/2+nc.getWidth()/5, nc.getHeight()/2+nc.getHeight()/5);
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88 | switch(action) {
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89 | case "left":
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90 | nc.zoomTo(new EastNorth(2*center.east()-newcenter.east(), center.north()));
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91 | break;
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92 | case "right":
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93 | nc.zoomTo(new EastNorth(newcenter.east(), center.north()));
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94 | break;
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95 | case "up":
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96 | nc.zoomTo(new EastNorth(center.east(), 2*center.north()-newcenter.north()));
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97 | break;
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98 | case "down":
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99 | nc.zoomTo(new EastNorth(center.east(), newcenter.north()));
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100 | break;
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101 | default: // Do nothing
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102 | }
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103 | }
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104 | }
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105 | }
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106 |
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107 | /**
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108 | * The point in the map that was the under the mouse point
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109 | * when moving around started.
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110 | *
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111 | * This is <code>null</code> if movement is not active
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112 | */
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113 | private MapViewPoint mousePosMoveStart;
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114 |
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115 | /**
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116 | * The map to move around.
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117 | */
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118 | private final NavigatableComponent nc;
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119 |
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120 | private final ArrayList<Pair<ZoomerAction, Shortcut>> registeredShortcuts = new ArrayList<>();
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121 |
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122 | /**
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123 | * Constructs a new {@code MapMover}.
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124 | * @param navComp the navigatable component
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125 | * @since 11713
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126 | */
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127 | public MapMover(NavigatableComponent navComp) {
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128 | this.nc = navComp;
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129 | nc.addMouseListener(this);
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130 | nc.addMouseMotionListener(this);
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131 | nc.addMouseWheelListener(this);
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132 |
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133 | registerActionShortcut(new ZoomerAction("right"),
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134 | Shortcut.registerShortcut("system:movefocusright", tr("Map: {0}", tr("Move right")), KeyEvent.VK_RIGHT, Shortcut.CTRL));
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135 |
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136 | registerActionShortcut(new ZoomerAction("left"),
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137 | Shortcut.registerShortcut("system:movefocusleft", tr("Map: {0}", tr("Move left")), KeyEvent.VK_LEFT, Shortcut.CTRL));
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138 |
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139 | registerActionShortcut(new ZoomerAction("up"),
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140 | Shortcut.registerShortcut("system:movefocusup", tr("Map: {0}", tr("Move up")), KeyEvent.VK_UP, Shortcut.CTRL));
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141 | registerActionShortcut(new ZoomerAction("down"),
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142 | Shortcut.registerShortcut("system:movefocusdown", tr("Map: {0}", tr("Move down")), KeyEvent.VK_DOWN, Shortcut.CTRL));
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143 |
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144 | // see #10592 - Disable these alternate shortcuts on OS X because of conflict with system shortcut
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145 | if (!Main.isPlatformOsx()) {
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146 | registerActionShortcut(new ZoomerAction(",", "MapMover.Zoomer.in"),
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147 | Shortcut.registerShortcut("view:zoominalternate", tr("Map: {0}", tr("Zoom in")), KeyEvent.VK_COMMA, Shortcut.CTRL));
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148 |
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149 | registerActionShortcut(new ZoomerAction(".", "MapMover.Zoomer.out"),
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150 | Shortcut.registerShortcut("view:zoomoutalternate", tr("Map: {0}", tr("Zoom out")), KeyEvent.VK_PERIOD, Shortcut.CTRL));
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151 | }
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152 | }
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153 |
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154 | private void registerActionShortcut(ZoomerAction action, Shortcut shortcut) {
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155 | MainApplication.registerActionShortcut(action, shortcut);
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156 | registeredShortcuts.add(new Pair<>(action, shortcut));
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157 | }
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158 |
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159 | private boolean movementInProgress() {
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160 | return mousePosMoveStart != null;
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161 | }
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162 |
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163 | /**
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164 | * If the right (and only the right) mouse button is pressed, move the map.
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165 | */
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166 | @Override
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167 | public void mouseDragged(MouseEvent e) {
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168 | int offMask = MouseEvent.BUTTON1_DOWN_MASK | MouseEvent.BUTTON2_DOWN_MASK;
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169 | boolean allowMovement = (e.getModifiersEx() & (MouseEvent.BUTTON3_DOWN_MASK | offMask)) == MouseEvent.BUTTON3_DOWN_MASK;
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170 | if (Main.isPlatformOsx()) {
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171 | MapFrame map = MainApplication.getMap();
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172 | int macMouseMask = MouseEvent.CTRL_DOWN_MASK | MouseEvent.BUTTON1_DOWN_MASK;
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173 | boolean macMovement = e.getModifiersEx() == macMouseMask;
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174 | boolean allowedMode = !map.mapModeSelect.equals(map.mapMode)
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175 | || SelectAction.Mode.SELECT.equals(map.mapModeSelect.getMode());
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176 | allowMovement |= macMovement && allowedMode;
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177 | }
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178 | if (allowMovement) {
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179 | doMoveForDrag(e);
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180 | } else {
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181 | endMovement();
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182 | }
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183 | }
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184 |
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185 | private void doMoveForDrag(MouseEvent e) {
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186 | if (!movementInProgress()) {
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187 | startMovement(e);
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188 | }
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189 | EastNorth center = nc.getCenter();
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190 | EastNorth mouseCenter = nc.getEastNorth(e.getX(), e.getY());
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191 | nc.zoomTo(mousePosMoveStart.getEastNorth().add(center).subtract(mouseCenter));
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192 | }
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193 |
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194 | /**
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195 | * Start the movement, if it was the 3rd button (right button).
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196 | */
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197 | @Override
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198 | public void mousePressed(MouseEvent e) {
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199 | int offMask = MouseEvent.BUTTON1_DOWN_MASK | MouseEvent.BUTTON2_DOWN_MASK;
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200 | int macMouseMask = MouseEvent.CTRL_DOWN_MASK | MouseEvent.BUTTON1_DOWN_MASK;
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201 | if ((e.getButton() == MouseEvent.BUTTON3 && (e.getModifiersEx() & offMask) == 0) ||
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202 | (Main.isPlatformOsx() && e.getModifiersEx() == macMouseMask)) {
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203 | startMovement(e);
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204 | }
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205 | }
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206 |
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207 | /**
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208 | * Change the cursor back to it's pre-move cursor.
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209 | */
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210 | @Override
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211 | public void mouseReleased(MouseEvent e) {
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212 | if (e.getButton() == MouseEvent.BUTTON3 || (Main.isPlatformOsx() && e.getButton() == MouseEvent.BUTTON1)) {
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213 | endMovement();
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214 | }
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215 | }
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216 |
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217 | /**
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218 | * Start movement by setting a new cursor and remember the current mouse
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219 | * position.
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220 | * @param e The mouse event that leat to the movement from.
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221 | */
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222 | private void startMovement(MouseEvent e) {
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223 | if (movementInProgress()) {
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224 | return;
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225 | }
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226 | mousePosMoveStart = nc.getState().getForView(e.getX(), e.getY());
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227 | nc.setNewCursor(Cursor.MOVE_CURSOR, this);
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228 | }
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229 |
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230 | /**
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231 | * End the movement. Setting back the cursor and clear the movement variables
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232 | */
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233 | private void endMovement() {
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234 | if (!movementInProgress()) {
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235 | return;
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236 | }
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237 | nc.resetCursor(this);
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238 | mousePosMoveStart = null;
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239 | }
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240 |
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241 | /**
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242 | * Zoom the map by 1/5th of current zoom per wheel-delta.
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243 | * @param e The wheel event.
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244 | */
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245 | @Override
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246 | public void mouseWheelMoved(MouseWheelEvent e) {
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247 | int rotation = PROP_ZOOM_REVERSE_WHEEL.get() ? -e.getWheelRotation() : e.getWheelRotation();
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248 | nc.zoomManyTimes(e.getX(), e.getY(), rotation);
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249 | }
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250 |
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251 | /**
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252 | * Emulates dragging on Mac OSX.
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253 | */
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254 | @Override
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255 | public void mouseMoved(MouseEvent e) {
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256 | if (!movementInProgress()) {
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257 | return;
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258 | }
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259 | // Mac OSX simulates with ctrl + mouse 1 the second mouse button hence no dragging events get fired.
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260 | // Is only the selected mouse button pressed?
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261 | if (Main.isPlatformOsx()) {
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262 | if (e.getModifiersEx() == MouseEvent.CTRL_DOWN_MASK) {
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263 | doMoveForDrag(e);
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264 | } else {
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265 | endMovement();
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266 | }
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267 | }
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268 | }
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269 |
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270 | @Override
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271 | public void destroy() {
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272 | for (Pair<ZoomerAction, Shortcut> shortcut : registeredShortcuts) {
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273 | MainApplication.unregisterActionShortcut(shortcut.a, shortcut.b);
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274 | }
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275 | }
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276 | }
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