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.Component;
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5 | import java.awt.Point;
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6 | import java.awt.Polygon;
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7 | import java.awt.Rectangle;
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8 | import java.awt.event.InputEvent;
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9 | import java.awt.event.MouseEvent;
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10 | import java.awt.event.MouseListener;
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11 | import java.awt.event.MouseMotionListener;
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12 | import java.beans.PropertyChangeEvent;
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13 | import java.beans.PropertyChangeListener;
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14 | import java.util.Collection;
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15 | import java.util.LinkedList;
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16 |
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17 | import org.openstreetmap.josm.Main;
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18 | import org.openstreetmap.josm.actions.SelectByInternalPointAction;
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19 | import org.openstreetmap.josm.data.osm.Node;
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20 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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21 | import org.openstreetmap.josm.data.osm.Way;
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22 |
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23 | /**
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24 | * Manages the selection of a rectangle. Listening to left and right mouse button
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25 | * presses and to mouse motions and draw the rectangle accordingly.
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26 | *
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27 | * Left mouse button selects a rectangle from the press until release. Pressing
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28 | * right mouse button while left is still pressed enable the rectangle to move
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29 | * around. Releasing the left button fires an action event to the listener given
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30 | * at constructor, except if the right is still pressed, which just remove the
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31 | * selection rectangle and does nothing.
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32 | *
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33 | * The point where the left mouse button was pressed and the current mouse
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34 | * position are two opposite corners of the selection rectangle.
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35 | *
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36 | * It is possible to specify an aspect ratio (width per height) which the
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37 | * selection rectangle always must have. In this case, the selection rectangle
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38 | * will be the largest window with this aspect ratio, where the position the left
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39 | * mouse button was pressed and the corner of the current mouse position are at
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40 | * opposite sites (the mouse position corner is the corner nearest to the mouse
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41 | * cursor).
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42 | *
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43 | * When the left mouse button was released, an ActionEvent is send to the
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44 | * ActionListener given at constructor. The source of this event is this manager.
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45 | *
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46 | * @author imi
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47 | */
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48 | public class SelectionManager implements MouseListener, MouseMotionListener, PropertyChangeListener {
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49 |
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50 | /**
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51 | * This is the interface that an user of SelectionManager has to implement
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52 | * to get informed when a selection closes.
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53 | * @author imi
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54 | */
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55 | public interface SelectionEnded {
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56 | /**
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57 | * Called, when the left mouse button was released.
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58 | * @param r The rectangle that is currently the selection.
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59 | * @param e The mouse event.
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60 | * @see InputEvent#getModifiersEx()
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61 | */
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62 | public void selectionEnded(Rectangle r, MouseEvent e);
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63 | /**
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64 | * Called to register the selection manager for "active" property.
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65 | * @param listener The listener to register
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66 | */
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67 | public void addPropertyChangeListener(PropertyChangeListener listener);
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68 | /**
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69 | * Called to remove the selection manager from the listener list
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70 | * for "active" property.
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71 | * @param listener The listener to register
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72 | */
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73 | public void removePropertyChangeListener(PropertyChangeListener listener);
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74 | }
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75 | /**
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76 | * The listener that receives the events after left mouse button is released.
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77 | */
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78 | private final SelectionEnded selectionEndedListener;
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79 | /**
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80 | * Position of the map when the mouse button was pressed.
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81 | * If this is not <code>null</code>, a rectangle is drawn on screen.
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82 | */
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83 | private Point mousePosStart;
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84 | /**
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85 | * Position of the map when the selection rectangle was last drawn.
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86 | */
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87 | private Point mousePos;
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88 | /**
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89 | * The Component, the selection rectangle is drawn onto.
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90 | */
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91 | private final NavigatableComponent nc;
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92 | /**
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93 | * Whether the selection rectangle must obtain the aspect ratio of the
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94 | * drawComponent.
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95 | */
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96 | private boolean aspectRatio;
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97 |
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98 | private boolean lassoMode;
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99 | private Polygon lasso = new Polygon();
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100 |
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101 | /**
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102 | * Create a new SelectionManager.
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103 | *
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104 | * @param selectionEndedListener The action listener that receives the event when
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105 | * the left button is released.
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106 | * @param aspectRatio If true, the selection window must obtain the aspect
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107 | * ratio of the drawComponent.
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108 | * @param navComp The component, the rectangle is drawn onto.
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109 | */
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110 | public SelectionManager(SelectionEnded selectionEndedListener, boolean aspectRatio, NavigatableComponent navComp) {
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111 | this.selectionEndedListener = selectionEndedListener;
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112 | this.aspectRatio = aspectRatio;
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113 | this.nc = navComp;
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114 | }
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115 |
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116 | /**
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117 | * Register itself at the given event source.
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118 | * @param eventSource The emitter of the mouse events.
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119 | * @param lassoMode {@code true} to enable lasso mode, {@code false} to disable it.
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120 | */
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121 | public void register(NavigatableComponent eventSource, boolean lassoMode) {
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122 | this.lassoMode = lassoMode;
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123 | eventSource.addMouseListener(this);
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124 | eventSource.addMouseMotionListener(this);
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125 | selectionEndedListener.addPropertyChangeListener(this);
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126 | eventSource.addPropertyChangeListener("scale", new PropertyChangeListener(){
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127 | @Override
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128 | public void propertyChange(PropertyChangeEvent evt) {
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129 | if (mousePosStart != null) {
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130 | paintRect();
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131 | mousePos = mousePosStart = null;
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132 | }
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133 | }
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134 | });
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135 | }
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136 | /**
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137 | * Unregister itself from the given event source. If a selection rectangle is
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138 | * shown, hide it first.
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139 | *
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140 | * @param eventSource The emitter of the mouse events.
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141 | */
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142 | public void unregister(Component eventSource) {
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143 | eventSource.removeMouseListener(this);
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144 | eventSource.removeMouseMotionListener(this);
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145 | selectionEndedListener.removePropertyChangeListener(this);
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146 | }
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147 |
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148 | /**
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149 | * If the correct button, from the "drawing rectangle" mode
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150 | */
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151 | @Override
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152 | public void mousePressed(MouseEvent e) {
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153 | if (e.getButton() == MouseEvent.BUTTON1 && e.getClickCount() > 1 && Main.main.getCurrentDataSet() != null) {
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154 | SelectByInternalPointAction.performSelection(Main.map.mapView.getEastNorth(e.getX(), e.getY()),
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155 | (e.getModifiersEx() & MouseEvent.SHIFT_DOWN_MASK) > 0,
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156 | (e.getModifiersEx() & MouseEvent.CTRL_DOWN_MASK) > 0);
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157 | } else if (e.getButton() == MouseEvent.BUTTON1) {
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158 | mousePosStart = mousePos = e.getPoint();
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159 |
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160 | lasso.reset();
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161 | lasso.addPoint(mousePosStart.x, mousePosStart.y);
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162 | }
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163 | }
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164 |
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165 | /**
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166 | * If the correct button is hold, draw the rectangle.
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167 | */
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168 | @Override
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169 | public void mouseDragged(MouseEvent e) {
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170 | int buttonPressed = e.getModifiersEx() & (MouseEvent.BUTTON1_DOWN_MASK | MouseEvent.BUTTON3_DOWN_MASK);
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171 |
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172 | if (buttonPressed != 0) {
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173 | if (mousePosStart == null) {
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174 | mousePosStart = mousePos = e.getPoint();
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175 | }
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176 | if (!lassoMode) {
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177 | paintRect();
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178 | }
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179 | }
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180 |
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181 | if (buttonPressed == MouseEvent.BUTTON1_DOWN_MASK) {
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182 | mousePos = e.getPoint();
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183 | if (lassoMode) {
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184 | paintLasso();
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185 | } else {
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186 | paintRect();
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187 | }
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188 | } else if (buttonPressed == (MouseEvent.BUTTON1_DOWN_MASK | MouseEvent.BUTTON3_DOWN_MASK)) {
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189 | mousePosStart.x += e.getX()-mousePos.x;
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190 | mousePosStart.y += e.getY()-mousePos.y;
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191 | mousePos = e.getPoint();
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192 | paintRect();
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193 | }
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194 | }
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195 |
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196 | /**
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197 | * Check the state of the keys and buttons and set the selection accordingly.
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198 | */
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199 | @Override
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200 | public void mouseReleased(MouseEvent e) {
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201 | if (e.getButton() != MouseEvent.BUTTON1)
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202 | return;
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203 | if (mousePos == null || mousePosStart == null)
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204 | return; // injected release from outside
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205 | // disable the selection rect
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206 | Rectangle r;
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207 | if (!lassoMode) {
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208 | nc.requestClearRect();
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209 | r = getSelectionRectangle();
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210 |
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211 | lasso = rectToPolygon(r);
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212 | } else {
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213 | nc.requestClearPoly();
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214 | lasso.addPoint(mousePos.x, mousePos.y);
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215 | r = lasso.getBounds();
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216 | }
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217 | mousePosStart = null;
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218 | mousePos = null;
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219 |
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220 | if ((e.getModifiersEx() & MouseEvent.BUTTON3_DOWN_MASK) == 0) {
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221 | selectionEndedListener.selectionEnded(r, e);
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222 | }
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223 | }
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224 |
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225 | /**
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226 | * Draws a selection rectangle on screen.
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227 | */
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228 | private void paintRect() {
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229 | if (mousePos == null || mousePosStart == null || mousePos == mousePosStart)
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230 | return;
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231 | nc.requestPaintRect(getSelectionRectangle());
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232 | }
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233 |
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234 | private void paintLasso() {
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235 | if (mousePos == null || mousePosStart == null || mousePos == mousePosStart) {
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236 | return;
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237 | }
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238 | lasso.addPoint(mousePos.x, mousePos.y);
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239 | nc.requestPaintPoly(lasso);
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240 | }
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241 |
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242 | /**
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243 | * Calculate and return the current selection rectangle
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244 | * @return A rectangle that spans from mousePos to mouseStartPos
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245 | */
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246 | private Rectangle getSelectionRectangle() {
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247 | int x = mousePosStart.x;
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248 | int y = mousePosStart.y;
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249 | int w = mousePos.x - mousePosStart.x;
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250 | int h = mousePos.y - mousePosStart.y;
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251 | if (w < 0) {
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252 | x += w;
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253 | w = -w;
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254 | }
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255 | if (h < 0) {
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256 | y += h;
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257 | h = -h;
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258 | }
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259 |
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260 | if (aspectRatio) {
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261 | /* Keep the aspect ratio by growing the rectangle; the
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262 | * rectangle is always under the cursor. */
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263 | double aspectRatio = (double)nc.getWidth()/nc.getHeight();
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264 | if ((double)w/h < aspectRatio) {
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265 | int neww = (int)(h*aspectRatio);
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266 | if (mousePos.x < mousePosStart.x) {
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267 | x += w - neww;
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268 | }
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269 | w = neww;
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270 | } else {
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271 | int newh = (int)(w/aspectRatio);
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272 | if (mousePos.y < mousePosStart.y) {
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273 | y += h - newh;
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274 | }
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275 | h = newh;
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276 | }
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277 | }
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278 |
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279 | return new Rectangle(x,y,w,h);
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280 | }
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281 |
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282 | /**
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283 | * If the action goes inactive, remove the selection rectangle from screen
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284 | */
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285 | @Override
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286 | public void propertyChange(PropertyChangeEvent evt) {
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287 | if ("active".equals(evt.getPropertyName()) && !(Boolean)evt.getNewValue() && mousePosStart != null) {
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288 | paintRect();
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289 | mousePosStart = null;
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290 | mousePos = null;
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291 | }
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292 | }
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293 |
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294 | /**
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295 | * Return a list of all objects in the selection, respecting the different
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296 | * modifier.
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297 | *
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298 | * @param alt Whether the alt key was pressed, which means select all
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299 | * objects that are touched, instead those which are completely covered.
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300 | * @return The collection of selected objects.
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301 | */
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302 | public Collection<OsmPrimitive> getSelectedObjects(boolean alt) {
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303 |
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304 | Collection<OsmPrimitive> selection = new LinkedList<>();
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305 |
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306 | // whether user only clicked, not dragged.
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307 | boolean clicked = false;
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308 | Rectangle bounding = lasso.getBounds();
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309 | if (bounding.height <= 2 && bounding.width <= 2) {
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310 | clicked = true;
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311 | }
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312 |
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313 | if (clicked) {
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314 | Point center = new Point(lasso.xpoints[0], lasso.ypoints[0]);
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315 | OsmPrimitive osm = nc.getNearestNodeOrWay(center, OsmPrimitive.isSelectablePredicate, false);
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316 | if (osm != null) {
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317 | selection.add(osm);
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318 | }
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319 | } else {
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320 | // nodes
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321 | for (Node n : nc.getCurrentDataSet().getNodes()) {
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322 | if (n.isSelectable() && lasso.contains(nc.getPoint2D(n))) {
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323 | selection.add(n);
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324 | }
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325 | }
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326 |
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327 | // ways
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328 | for (Way w : nc.getCurrentDataSet().getWays()) {
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329 | if (!w.isSelectable() || w.getNodesCount() == 0) {
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330 | continue;
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331 | }
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332 | if (alt) {
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333 | for (Node n : w.getNodes()) {
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334 | if (!n.isIncomplete() && lasso.contains(nc.getPoint2D(n))) {
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335 | selection.add(w);
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336 | break;
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337 | }
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338 | }
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339 | } else {
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340 | boolean allIn = true;
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341 | for (Node n : w.getNodes()) {
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342 | if (!n.isIncomplete() && !lasso.contains(nc.getPoint(n))) {
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343 | allIn = false;
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344 | break;
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345 | }
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346 | }
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347 | if (allIn) {
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348 | selection.add(w);
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349 | }
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350 | }
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351 | }
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352 | }
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353 | return selection;
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354 | }
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355 |
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356 | private Polygon rectToPolygon(Rectangle r) {
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357 | Polygon poly = new Polygon();
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358 |
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359 | poly.addPoint(r.x, r.y);
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360 | poly.addPoint(r.x, r.y + r.height);
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361 | poly.addPoint(r.x + r.width, r.y + r.height);
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362 | poly.addPoint(r.x + r.width, r.y);
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363 |
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364 | return poly;
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365 | }
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366 |
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367 | /**
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368 | * Enables or disables the lasso mode.
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369 | * @param lassoMode {@code true} to enable lasso mode, {@code false} to disable it.
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370 | */
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371 | public void setLassoMode(boolean lassoMode) {
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372 | this.lassoMode = lassoMode;
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373 | }
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374 |
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375 | @Override
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376 | public void mouseClicked(MouseEvent e) {}
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377 | @Override
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378 | public void mouseEntered(MouseEvent e) {}
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379 | @Override
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380 | public void mouseExited(MouseEvent e) {}
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381 | @Override
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382 | public void mouseMoved(MouseEvent e) {}
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383 | }
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