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 java.awt.Color;
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5 | import java.awt.Graphics2D;
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6 | import java.awt.Point;
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7 | import java.awt.Polygon;
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8 | import java.awt.Rectangle;
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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.MouseListener;
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12 | import java.awt.event.MouseMotionListener;
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13 | import java.beans.PropertyChangeEvent;
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14 | import java.beans.PropertyChangeListener;
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15 | import java.util.Collection;
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16 | import java.util.LinkedList;
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17 |
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18 | import javax.swing.Action;
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19 |
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20 | import org.openstreetmap.josm.actions.SelectByInternalPointAction;
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21 | import org.openstreetmap.josm.data.Bounds;
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22 | import org.openstreetmap.josm.data.osm.DataSet;
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23 | import org.openstreetmap.josm.data.osm.Node;
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24 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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25 | import org.openstreetmap.josm.data.osm.Way;
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26 | import org.openstreetmap.josm.data.osm.visitor.paint.PaintColors;
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27 | import org.openstreetmap.josm.gui.layer.AbstractMapViewPaintable;
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28 | import org.openstreetmap.josm.tools.ColorHelper;
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29 |
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30 | /**
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31 | * Manages the selection of a rectangle or a lasso loop. Listening to left and right mouse button
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32 | * presses and to mouse motions and draw the rectangle accordingly.
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33 | *
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34 | * Left mouse button selects a rectangle from the press until release. Pressing
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35 | * right mouse button while left is still pressed enable the selection area to move
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36 | * around. Releasing the left button fires an action event to the listener given
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37 | * at constructor, except if the right is still pressed, which just remove the
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38 | * selection rectangle and does nothing.
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39 | *
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40 | * It is possible to switch between lasso selection and rectangle selection by using {@link #setLassoMode(boolean)}.
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41 | *
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42 | * The point where the left mouse button was pressed and the current mouse
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43 | * position are two opposite corners of the selection rectangle.
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44 | *
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45 | * For rectangle mode, it is possible to specify an aspect ratio (width per height) which the
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46 | * selection rectangle always must have. In this case, the selection rectangle
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47 | * will be the largest window with this aspect ratio, where the position the left
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48 | * mouse button was pressed and the corner of the current mouse position are at
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49 | * opposite sites (the mouse position corner is the corner nearest to the mouse
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50 | * cursor).
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51 | *
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52 | * When the left mouse button was released, an ActionEvent is send to the
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53 | * ActionListener given at constructor. The source of this event is this manager.
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54 | *
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55 | * @author imi
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56 | */
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57 | public class SelectionManager implements MouseListener, MouseMotionListener, PropertyChangeListener {
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58 |
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59 | /**
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60 | * This is the interface that an user of SelectionManager has to implement
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61 | * to get informed when a selection closes.
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62 | * @author imi
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63 | */
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64 | public interface SelectionEnded extends Action {
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65 | /**
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66 | * Called, when the left mouse button was released.
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67 | * @param r The rectangle that encloses the current selection.
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68 | * @param e The mouse event.
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69 | * @see InputEvent#getModifiersEx()
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70 | * @see SelectionManager#getSelectedObjects(boolean)
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71 | */
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72 | void selectionEnded(Rectangle r, MouseEvent e);
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73 | }
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74 |
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75 | /**
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76 | * This draws the selection hint (rectangle or lasso polygon) on the screen.
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77 | *
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78 | * @author Michael Zangl
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79 | */
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80 | private class SelectionHintLayer extends AbstractMapViewPaintable {
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81 | @Override
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82 | public void paint(Graphics2D g, MapView mv, Bounds bbox) {
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83 | if (mousePos == null || mousePosStart == null || mousePos == mousePosStart)
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84 | return;
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85 | Color color = ColorHelper.complement(PaintColors.getBackgroundColor());
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86 | g.setColor(color);
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87 | if (lassoMode) {
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88 | g.drawPolygon(lasso);
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89 |
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90 | g.setColor(new Color(color.getRed(), color.getGreen(), color.getBlue(), color.getAlpha() / 8));
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91 | g.fillPolygon(lasso);
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92 | } else {
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93 | Rectangle paintRect = getSelectionRectangle();
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94 | g.drawRect(paintRect.x, paintRect.y, paintRect.width, paintRect.height);
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95 | }
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96 | }
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97 | }
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98 |
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99 | /**
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100 | * The listener that receives the events after left mouse button is released.
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101 | */
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102 | private final SelectionEnded selectionEndedListener;
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103 | /**
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104 | * Position of the map when the mouse button was pressed.
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105 | * If this is not <code>null</code>, a rectangle/lasso line is drawn on screen.
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106 | * If this is <code>null</code>, no selection is active.
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107 | */
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108 | private Point mousePosStart;
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109 | /**
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110 | * The last position of the mouse while the mouse button was pressed.
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111 | */
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112 | private Point mousePos;
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113 | /**
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114 | * The Component that provides us with OSM data and the aspect is taken from.
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115 | */
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116 | private final NavigatableComponent nc;
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117 | /**
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118 | * Whether the selection rectangle must obtain the aspect ratio of the drawComponent.
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119 | */
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120 | private final boolean aspectRatio;
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121 |
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122 | /**
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123 | * <code>true</code> if we should paint a lasso instead of a rectangle.
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124 | */
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125 | private boolean lassoMode;
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126 | /**
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127 | * The polygon to store the selection outline if {@link #lassoMode} is used.
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128 | */
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129 | private final Polygon lasso = new Polygon();
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130 |
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131 | /**
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132 | * The result of the last selection.
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133 | */
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134 | private Polygon selectionResult = new Polygon();
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135 |
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136 | private final SelectionHintLayer selectionHintLayer = new SelectionHintLayer();
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137 |
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138 | /**
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139 | * Create a new SelectionManager.
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140 | *
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141 | * @param selectionEndedListener The action listener that receives the event when
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142 | * the left button is released.
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143 | * @param aspectRatio If true, the selection window must obtain the aspect
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144 | * ratio of the drawComponent.
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145 | * @param navComp The component that provides us with OSM data and the aspect is taken from.
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146 | */
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147 | public SelectionManager(SelectionEnded selectionEndedListener, boolean aspectRatio, NavigatableComponent navComp) {
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148 | this.selectionEndedListener = selectionEndedListener;
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149 | this.aspectRatio = aspectRatio;
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150 | this.nc = navComp;
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151 | }
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152 |
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153 | /**
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154 | * Register itself at the given event source and add a hint layer.
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155 | * @param eventSource The emitter of the mouse events.
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156 | * @param lassoMode {@code true} to enable lasso mode, {@code false} to disable it.
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157 | */
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158 | public void register(MapView eventSource, boolean lassoMode) {
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159 | this.lassoMode = lassoMode;
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160 | eventSource.addMouseListener(this);
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161 | eventSource.addMouseMotionListener(this);
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162 | selectionEndedListener.addPropertyChangeListener(this);
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163 | eventSource.addPropertyChangeListener("scale", evt -> abortSelecting());
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164 | eventSource.addTemporaryLayer(selectionHintLayer);
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165 | }
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166 |
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167 | /**
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168 | * Unregister itself from the given event source and hide the selection hint layer.
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169 | *
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170 | * @param eventSource The emitter of the mouse events.
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171 | */
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172 | public void unregister(MapView eventSource) {
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173 | abortSelecting();
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174 | eventSource.removeTemporaryLayer(selectionHintLayer);
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175 | eventSource.removeMouseListener(this);
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176 | eventSource.removeMouseMotionListener(this);
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177 | selectionEndedListener.removePropertyChangeListener(this);
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178 | }
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179 |
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180 | /**
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181 | * If the correct button, from the "drawing rectangle" mode
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182 | */
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183 | @Override
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184 | public void mousePressed(MouseEvent e) {
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185 | if (e.getButton() == MouseEvent.BUTTON1 && e.getClickCount() > 1 && MainApplication.getLayerManager().getActiveDataSet() != null) {
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186 | SelectByInternalPointAction.performSelection(MainApplication.getMap().mapView.getEastNorth(e.getX(), e.getY()),
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187 | (e.getModifiersEx() & MouseEvent.SHIFT_DOWN_MASK) != 0,
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188 | (e.getModifiersEx() & MouseEvent.CTRL_DOWN_MASK) != 0);
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189 | } else if (e.getButton() == MouseEvent.BUTTON1) {
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190 | mousePosStart = mousePos = e.getPoint();
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191 |
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192 | lasso.reset();
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193 | lasso.addPoint(mousePosStart.x, mousePosStart.y);
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194 | }
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195 | }
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196 |
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197 | /**
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198 | * If the correct button is hold, draw the rectangle.
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199 | */
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200 | @Override
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201 | public void mouseDragged(MouseEvent e) {
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202 | int buttonPressed = e.getModifiersEx() & (MouseEvent.BUTTON1_DOWN_MASK | MouseEvent.BUTTON3_DOWN_MASK);
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203 |
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204 | if (buttonPressed != 0) {
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205 | if (mousePosStart == null) {
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206 | mousePosStart = mousePos = e.getPoint();
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207 | }
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208 | selectionAreaChanged();
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209 | }
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210 |
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211 | if (buttonPressed == MouseEvent.BUTTON1_DOWN_MASK) {
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212 | mousePos = e.getPoint();
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213 | addLassoPoint(e.getPoint());
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214 | selectionAreaChanged();
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215 | } else if (buttonPressed == (MouseEvent.BUTTON1_DOWN_MASK | MouseEvent.BUTTON3_DOWN_MASK)) {
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216 | moveSelection(e.getX()-mousePos.x, e.getY()-mousePos.y);
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217 | mousePos = e.getPoint();
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218 | selectionAreaChanged();
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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 | * Moves the current selection by some pixels.
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224 | * @param dx How much to move it in x direction.
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225 | * @param dy How much to move it in y direction.
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226 | */
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227 | private void moveSelection(int dx, int dy) {
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228 | mousePosStart.x += dx;
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229 | mousePosStart.y += dy;
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230 | lasso.translate(dx, dy);
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231 | }
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232 |
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233 | /**
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234 | * Check the state of the keys and buttons and set the selection accordingly.
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235 | */
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236 | @Override
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237 | public void mouseReleased(MouseEvent e) {
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238 | if (e.getButton() == MouseEvent.BUTTON1) {
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239 | endSelecting(e);
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240 | }
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241 | }
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242 |
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243 | /**
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244 | * Ends the selection of the current area. This simulates a release of mouse button 1.
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245 | * @param e A mouse event that caused this. Needed for backward compatibility.
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246 | */
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247 | public void endSelecting(MouseEvent e) {
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248 | mousePos = e.getPoint();
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249 | if (lassoMode) {
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250 | addLassoPoint(e.getPoint());
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251 | }
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252 |
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253 | // Left mouse was released while right is still pressed.
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254 | boolean rightMouseStillPressed = (e.getModifiersEx() & MouseEvent.BUTTON3_DOWN_MASK) != 0;
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255 |
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256 | if (!rightMouseStillPressed) {
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257 | selectingDone(e);
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258 | }
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259 | abortSelecting();
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260 | }
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261 |
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262 | private void addLassoPoint(Point point) {
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263 | if (isNoSelection()) {
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264 | return;
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265 | }
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266 | lasso.addPoint(point.x, point.y);
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267 | }
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268 |
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269 | private boolean isNoSelection() {
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270 | return mousePos == null || mousePosStart == null || mousePos == mousePosStart;
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271 | }
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272 |
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273 | /**
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274 | * Calculate and return the current selection rectangle
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275 | * @return A rectangle that spans from mousePos to mouseStartPos
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276 | */
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277 | private Rectangle getSelectionRectangle() {
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278 | int x = mousePosStart.x;
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279 | int y = mousePosStart.y;
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280 | int w = mousePos.x - mousePosStart.x;
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281 | int h = mousePos.y - mousePosStart.y;
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282 | if (w < 0) {
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283 | x += w;
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284 | w = -w;
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285 | }
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286 | if (h < 0) {
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287 | y += h;
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288 | h = -h;
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289 | }
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290 |
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291 | if (aspectRatio) {
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292 | /* Keep the aspect ratio by growing the rectangle; the
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293 | * rectangle is always under the cursor. */
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294 | double aspectRatio = (double) nc.getWidth()/nc.getHeight();
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295 | if ((double) w/h < aspectRatio) {
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296 | int neww = (int) (h*aspectRatio);
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297 | if (mousePos.x < mousePosStart.x) {
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298 | x += w - neww;
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299 | }
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300 | w = neww;
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301 | } else {
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302 | int newh = (int) (w/aspectRatio);
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303 | if (mousePos.y < mousePosStart.y) {
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304 | y += h - newh;
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305 | }
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306 | h = newh;
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307 | }
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308 | }
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309 |
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310 | return new Rectangle(x, y, w, h);
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311 | }
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312 |
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313 | /**
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314 | * If the action goes inactive, remove the selection rectangle from screen
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315 | */
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316 | @Override
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317 | public void propertyChange(PropertyChangeEvent evt) {
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318 | if ("active".equals(evt.getPropertyName()) && !(Boolean) evt.getNewValue()) {
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319 | abortSelecting();
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320 | }
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321 | }
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322 |
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323 | /**
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324 | * Stores the current selection and stores the result in {@link #selectionResult} to be retrieved by
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325 | * {@link #getSelectedObjects(boolean)} later.
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326 | * @param e The mouse event that caused the selection to be finished.
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327 | */
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328 | private void selectingDone(MouseEvent e) {
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329 | if (isNoSelection()) {
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330 | // Nothing selected.
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331 | return;
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332 | }
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333 | Rectangle r;
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334 | if (lassoMode) {
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335 | r = lasso.getBounds();
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336 |
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337 | selectionResult = new Polygon(lasso.xpoints, lasso.ypoints, lasso.npoints);
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338 | } else {
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339 | r = getSelectionRectangle();
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340 |
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341 | selectionResult = rectToPolygon(r);
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342 | }
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343 | selectionEndedListener.selectionEnded(r, e);
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344 | }
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345 |
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346 | private void abortSelecting() {
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347 | if (mousePosStart != null) {
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348 | mousePos = mousePosStart = null;
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349 | lasso.reset();
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350 | selectionAreaChanged();
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351 | }
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352 | }
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353 |
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354 | private void selectionAreaChanged() {
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355 | selectionHintLayer.invalidate();
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356 | }
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357 |
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358 | /**
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359 | * Return a list of all objects in the active/last selection, respecting the different
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360 | * modifier.
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361 | *
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362 | * @param alt Whether the alt key was pressed, which means select all
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363 | * objects that are touched, instead those which are completely covered.
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364 | * @return The collection of selected objects.
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365 | */
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366 | public Collection<OsmPrimitive> getSelectedObjects(boolean alt) {
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367 | Collection<OsmPrimitive> selection = new LinkedList<>();
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368 |
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369 | // whether user only clicked, not dragged.
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370 | boolean clicked = false;
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371 | Rectangle bounding = selectionResult.getBounds();
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372 | if (bounding.height <= 2 && bounding.width <= 2) {
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373 | clicked = true;
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374 | }
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375 |
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376 | DataSet ds = MainApplication.getLayerManager().getActiveDataSet();
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377 | if (clicked) {
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378 | Point center = new Point(selectionResult.xpoints[0], selectionResult.ypoints[0]);
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379 | OsmPrimitive osm = nc.getNearestNodeOrWay(center, OsmPrimitive::isSelectable, false);
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380 | if (osm != null) {
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381 | selection.add(osm);
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382 | }
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383 | } else if (ds != null) {
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384 | // nodes
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385 | for (Node n : ds.getNodes()) {
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386 | if (n.isSelectable() && selectionResult.contains(nc.getPoint2D(n))) {
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387 | selection.add(n);
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388 | }
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389 | }
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390 |
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391 | // ways
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392 | for (Way w : ds.getWays()) {
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393 | if (!w.isSelectable() || w.isEmpty()) {
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394 | continue;
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395 | }
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396 | if (alt) {
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397 | if (w.getNodes().stream().anyMatch(n -> !n.isIncomplete() && selectionResult.contains(nc.getPoint2D(n)))) {
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398 | selection.add(w);
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399 | }
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400 | } else {
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401 | boolean allIn = w.getNodes().stream().allMatch(n -> n.isIncomplete() || selectionResult.contains(nc.getPoint(n)));
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402 | if (allIn) {
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403 | selection.add(w);
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404 | }
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405 | }
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406 | }
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407 | }
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408 | return selection;
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409 | }
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410 |
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411 | private static Polygon rectToPolygon(Rectangle r) {
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412 | Polygon poly = new Polygon();
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413 |
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414 | poly.addPoint(r.x, r.y);
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415 | poly.addPoint(r.x, r.y + r.height);
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416 | poly.addPoint(r.x + r.width, r.y + r.height);
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417 | poly.addPoint(r.x + r.width, r.y);
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418 |
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419 | return poly;
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420 | }
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421 |
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422 | /**
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423 | * Enables or disables the lasso mode.
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424 | * @param lassoMode {@code true} to enable lasso mode, {@code false} to disable it.
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425 | */
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426 | public void setLassoMode(boolean lassoMode) {
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427 | this.lassoMode = lassoMode;
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428 | }
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429 |
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430 | @Override
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431 | public void mouseClicked(MouseEvent e) {
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432 | // Do nothing
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433 | }
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434 |
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435 | @Override
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436 | public void mouseEntered(MouseEvent e) {
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437 | // Do nothing
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438 | }
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439 |
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440 | @Override
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441 | public void mouseExited(MouseEvent e) {
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442 | // Do nothing
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443 | }
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444 |
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445 | @Override
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446 | public void mouseMoved(MouseEvent e) {
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447 | // Do nothing
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448 | }
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449 | }
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