1 | // License: GPL. Copyright 2007 by Immanuel Scholz and others
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2 | package org.openstreetmap.josm.actions.mapmode;
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3 |
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4 | import static org.openstreetmap.josm.tools.I18n.tr;
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5 |
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6 | import java.awt.AWTEvent;
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7 | import java.awt.Cursor;
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8 | import java.awt.EventQueue;
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9 | import java.awt.Toolkit;
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10 | import java.awt.event.AWTEventListener;
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11 | import java.awt.event.ActionEvent;
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12 | import java.awt.event.InputEvent;
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13 | import java.awt.event.KeyEvent;
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14 | import java.awt.event.MouseEvent;
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15 | import java.util.Collection;
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16 | import java.util.Collections;
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17 | import java.util.HashSet;
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18 |
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19 | import org.openstreetmap.josm.Main;
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20 | import org.openstreetmap.josm.command.Command;
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21 | import org.openstreetmap.josm.command.DeleteCommand;
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22 | import org.openstreetmap.josm.data.osm.Node;
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23 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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24 | import org.openstreetmap.josm.data.osm.Relation;
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25 | import org.openstreetmap.josm.data.osm.Way;
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26 | import org.openstreetmap.josm.data.osm.WaySegment;
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27 | import org.openstreetmap.josm.gui.MapFrame;
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28 | import org.openstreetmap.josm.gui.dialogs.relation.RelationDialogManager;
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29 | import org.openstreetmap.josm.gui.layer.Layer;
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30 | import org.openstreetmap.josm.gui.layer.OsmDataLayer;
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31 | import org.openstreetmap.josm.tools.ImageProvider;
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32 | import org.openstreetmap.josm.tools.Shortcut;
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33 |
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34 | /**
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35 | * An action that enables the user to delete nodes and other objects.
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36 | *
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37 | * The user can click on an object, which gets deleted if possible. When Ctrl is
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38 | * pressed when releasing the button, the objects and all its references are
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39 | * deleted.
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40 | *
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41 | * If the user did not press Ctrl and the object has any references, the user
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42 | * is informed and nothing is deleted.
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43 | *
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44 | * If the user enters the mapmode and any object is selected, all selected
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45 | * objects that can be deleted will.
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46 | *
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47 | * @author imi
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48 | */
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49 |
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50 | /**
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51 | * This class contains stubs for highlighting affected primitives when affected.
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52 | * However, way segments can be deleted as well, but cannot be highlighted
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53 | * alone. If the highlight feature for this delete action is to be implemented
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54 | * properly, highlighting way segments must be possible first. --xeen, 2009-09-02
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55 | */
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56 | public class DeleteAction extends MapMode implements AWTEventListener {
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57 | //private boolean drawTargetHighlight;
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58 | private boolean drawTargetCursor;
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59 | //private Collection<? extends OsmPrimitive> oldPrims = null;
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60 |
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61 | // Cache previous mouse event (needed when only the modifier keys are
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62 | // pressed but the mouse isn't moved)
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63 | private MouseEvent oldEvent = null;
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64 |
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65 | private enum Cursors {
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66 | none,
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67 | node,
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68 | segment,
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69 | way_node_only,
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70 | way_normal,
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71 | way_only;
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72 |
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73 | private Cursor c = null;
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74 | // This loads and caches the cursor for each
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75 | public Cursor cursor() {
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76 | if(c == null) {
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77 | String nm = "delete_" + this.name().toLowerCase();
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78 | // "None" has no special icon
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79 | nm = nm.equals("delete_none") ? "delete" : nm;
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80 | this.c = ImageProvider.getCursor("normal", nm);
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81 | }
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82 | return c;
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83 | }
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84 | }
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85 | private Cursors currCursor = Cursors.none;
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86 |
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87 | /**
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88 | * Construct a new DeleteAction. Mnemonic is the delete - key.
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89 | * @param mapFrame The frame this action belongs to.
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90 | */
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91 | public DeleteAction(MapFrame mapFrame) {
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92 | super(tr("Delete Mode"),
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93 | "delete",
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94 | tr("Delete nodes or ways."),
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95 | Shortcut.registerShortcut("mapmode:delete", tr("Mode: {0}",tr("Delete")), KeyEvent.VK_D, Shortcut.GROUP_EDIT),
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96 | mapFrame,
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97 | ImageProvider.getCursor("normal", "delete"));
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98 | }
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99 |
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100 | @Override public void enterMode() {
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101 | super.enterMode();
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102 | if (!isEnabled())
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103 | return;
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104 | //drawTargetHighlight = Main.pref.getBoolean("draw.target-highlight", true);
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105 | drawTargetCursor = Main.pref.getBoolean("draw.target-cursor", true);
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106 |
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107 | Main.map.mapView.addMouseListener(this);
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108 | Main.map.mapView.addMouseMotionListener(this);
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109 | // This is required to update the cursors when ctrl/shift/alt is pressed
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110 | try {
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111 | Toolkit.getDefaultToolkit().addAWTEventListener(this, AWTEvent.KEY_EVENT_MASK);
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112 | } catch (SecurityException ex) {}
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113 |
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114 | currCursor = Cursors.none;
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115 | }
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116 |
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117 | @Override public void exitMode() {
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118 | super.exitMode();
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119 | Main.map.mapView.removeMouseListener(this);
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120 | Main.map.mapView.removeMouseMotionListener(this);
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121 | try {
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122 | Toolkit.getDefaultToolkit().removeAWTEventListener(this);
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123 | } catch (SecurityException ex) {}
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124 | }
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125 |
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126 |
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127 | @Override public void actionPerformed(ActionEvent e) {
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128 | super.actionPerformed(e);
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129 | if(!Main.map.mapView.isActiveLayerDrawable())
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130 | return;
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131 | doActionPerformed(e);
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132 | }
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133 |
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134 | public void doActionPerformed(ActionEvent e) {
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135 | if(!Main.map.mapView.isActiveLayerDrawable())
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136 | return;
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137 | boolean ctrl = (e.getModifiers() & ActionEvent.CTRL_MASK) != 0;
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138 | boolean alt = (e.getModifiers() & (ActionEvent.ALT_MASK|InputEvent.ALT_GRAPH_MASK)) != 0;
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139 |
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140 | Command c;
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141 | if (ctrl) {
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142 | c = DeleteCommand.deleteWithReferences(getEditLayer(),getCurrentDataSet().getSelected());
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143 | } else {
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144 | c = DeleteCommand.delete(getEditLayer(),getCurrentDataSet().getSelected(), !alt);
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145 | }
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146 | if (c != null) {
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147 | Main.main.undoRedo.add(c);
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148 | }
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149 |
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150 | getCurrentDataSet().setSelected();
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151 | Main.map.repaint();
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152 | }
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153 |
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154 | /**
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155 | * Listen to mouse move to be able to update the cursor (and highlights)
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156 | * @param MouseEvent The mouse event that has been captured
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157 | */
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158 | @Override public void mouseMoved(MouseEvent e) {
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159 | oldEvent = e;
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160 | updateCursor(e, e.getModifiers());
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161 | }
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162 |
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163 | /**
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164 | * This function handles all work related to updating the cursor and
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165 | * highlights. For now, only the cursor is enabled because highlighting
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166 | * requires WaySegment to be highlightable.
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167 | *
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168 | * Normally the mouse event also contains the modifiers. However, when the
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169 | * mouse is not moved and only modifier keys are pressed, no mouse event
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170 | * occurs. We can use AWTEvent to catch those but still lack a proper
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171 | * mouseevent. Instead we copy the previous event and only update the
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172 | * modifiers.
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173 | *
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174 | * @param MouseEvent
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175 | * @parm int modifiers
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176 | */
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177 | private void updateCursor(MouseEvent e, int modifiers) {
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178 | if(!Main.map.mapView.isActiveLayerVisible() || e == null)
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179 | return;
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180 |
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181 | // Clean old highlights
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182 | //cleanOldHighlights();
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183 |
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184 | Command c = buildDeleteCommands(e, modifiers, true);
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185 | if(c == null) {
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186 | setCursor(Cursors.none);
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187 | return;
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188 | }
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189 |
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190 | Collection<OsmPrimitive> prims = new HashSet<OsmPrimitive>();
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191 | Collection<OsmPrimitive> mods = new HashSet<OsmPrimitive>();
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192 | c.fillModifiedData(mods, prims, prims);
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193 |
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194 | if(prims.size() == 0 && mods.size() == 0) {
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195 | // Default-Cursor
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196 | setCursor(Cursors.none);
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197 | return;
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198 | }
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199 |
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200 | // There are no deleted parts if solely a way segment is deleted
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201 | // This is no the case when actually deleting only a segment but that
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202 | // segment happens to be the whole way. This is an acceptable error
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203 | // though
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204 | if(prims.size() == 0) {
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205 | setCursor(Cursors.segment);
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206 | } else if(prims.size() == 1 && prims.toArray()[0] instanceof Node) {
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207 | setCursor(Cursors.node);
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208 | } else if(prims.size() == 1 && prims.toArray()[0] instanceof Way) {
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209 | setCursor(Cursors.way_only);
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210 | } else {
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211 | // Decide between non-accel click where "useless" nodes are deleted
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212 | // and ctrl-click where nodes and ways are deleted
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213 | boolean ctrl = (modifiers & ActionEvent.CTRL_MASK) != 0;
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214 | if(ctrl) {
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215 | setCursor(Cursors.way_node_only);
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216 | } else {
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217 | setCursor(Cursors.way_normal);
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218 | }
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219 |
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220 | }
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221 |
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222 | // Needs to implement WaySegment highlight first
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223 | /*if(drawTargetHighlight) {
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224 | // Add new highlights
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225 | for(OsmPrimitive p : prims) {
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226 | p.highlighted = true;
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227 | }
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228 | oldPrims = prims;
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229 | }*/
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230 |
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231 | // We only need to repaint if the highlights changed
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232 | //Main.map.mapView.repaint();
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233 | }
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234 |
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235 | /**
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236 | * Small helper function that cleans old highlights
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237 | */
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238 | /*private void cleanOldHighlights() {
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239 | if(oldPrims == null)
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240 | return;
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241 | for(OsmPrimitive p: oldPrims) {
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242 | p.highlighted = false;
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243 | }
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244 | }*/
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245 |
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246 | /**
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247 | * If user clicked with the left button, delete the nearest object.
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248 | * position.
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249 | */
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250 | @Override public void mouseClicked(MouseEvent e) {
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251 | if (e.getButton() != MouseEvent.BUTTON1)
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252 | return;
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253 | if(!Main.map.mapView.isActiveLayerVisible())
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254 | return;
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255 |
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256 | // request focus in order to enable the expected keyboard shortcuts
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257 | //
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258 | Main.map.mapView.requestFocus();
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259 |
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260 | Command c = buildDeleteCommands(e, e.getModifiers(), false);
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261 | if (c != null) {
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262 | Main.main.undoRedo.add(c);
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263 | }
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264 |
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265 | getCurrentDataSet().setSelected();
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266 | Main.map.mapView.repaint();
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267 | }
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268 |
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269 | @Override public String getModeHelpText() {
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270 | return tr("Click to delete. Shift: delete way segment. Alt: don't delete unused nodes when deleting a way. Ctrl: delete referring objects.");
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271 | }
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272 |
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273 | @Override public boolean layerIsSupported(Layer l) {
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274 | return l instanceof OsmDataLayer;
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275 | }
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276 |
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277 | @Override
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278 | protected void updateEnabledState() {
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279 | setEnabled(Main.map != null && Main.map.mapView != null && Main.map.mapView.isActiveLayerDrawable());
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280 | }
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281 |
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282 | /**
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283 | * Deletes the relation in the context of the given layer. Also notifies
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284 | * {@see RelationDialogManager} and {@see OsmDataLayer#fireDataChange()} events.
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285 | *
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286 | * @param layer the layer in whose context the relation is deleted. Must not be null.
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287 | * @param toDelete the relation to be deleted. Must not be null.
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288 | * @exception IllegalArgumentException thrown if layer is null
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289 | * @exception IllegalArgumentException thrown if toDelete is nul
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290 | */
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291 | public static void deleteRelation(OsmDataLayer layer, Relation toDelete) {
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292 | if (layer == null)
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293 | throw new IllegalArgumentException(tr("parameter ''{0}'' must not be null", "layer"));
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294 | if (toDelete == null)
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295 | throw new IllegalArgumentException(tr("parameter ''{0}'' must not be null", "toDelete"));
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296 |
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297 | Command cmd = DeleteCommand.delete(layer, Collections.singleton(toDelete));
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298 | if (cmd != null) {
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299 | // cmd can be null if the user cancels dialogs DialogCommand displays
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300 | Main.main.undoRedo.add(cmd);
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301 | RelationDialogManager.getRelationDialogManager().close(layer, toDelete);
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302 | layer.fireDataChange();
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303 | }
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304 | }
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305 |
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306 | /**
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307 | * This function takes any mouse event argument and builds the list of elements
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308 | * that should be deleted but does not actually delete them.
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309 | * @param e MouseEvent from which modifiers and position are taken
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310 | * @param int modifiers For explanation: @see updateCursor
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311 | * @param Simulate Set to true if the user should be bugged with additional
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312 | * dialogs
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313 | * @return
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314 | */
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315 | private Command buildDeleteCommands(MouseEvent e, int modifiers, boolean simulate) {
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316 | // Note: CTRL is the only modifier that is checked in MouseMove, don't
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317 | // forget updating it there
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318 | boolean ctrl = (modifiers & ActionEvent.CTRL_MASK) != 0;
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319 | boolean shift = (modifiers & ActionEvent.SHIFT_MASK) != 0;
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320 | boolean alt = (modifiers & (ActionEvent.ALT_MASK|InputEvent.ALT_GRAPH_MASK)) != 0;
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321 |
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322 | OsmPrimitive sel = Main.map.mapView.getNearestNode(e.getPoint());
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323 | Command c = null;
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324 | if (sel == null) {
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325 | WaySegment ws = Main.map.mapView.getNearestWaySegment(e.getPoint());
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326 | if (ws != null) {
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327 | if (shift) {
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328 | c = DeleteCommand.deleteWaySegment(getEditLayer(),ws);
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329 | } else if (ctrl) {
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330 | c = DeleteCommand.deleteWithReferences(getEditLayer(),Collections.singleton((OsmPrimitive)ws.way),true);
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331 | } else {
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332 | c = DeleteCommand.delete(getEditLayer(),Collections.singleton((OsmPrimitive)ws.way), !alt, simulate);
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333 | }
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334 | }
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335 | } else if (ctrl) {
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336 | c = DeleteCommand.deleteWithReferences(getEditLayer(),Collections.singleton(sel));
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337 | } else {
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338 | c = DeleteCommand.delete(getEditLayer(),Collections.singleton(sel), !alt, simulate);
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339 | }
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340 |
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341 | return c;
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342 | }
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343 |
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344 | /**
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345 | * This function sets the given cursor in a safe way. This implementation
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346 | * differs from the on in DrawAction (it is favorable, too).
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347 | * FIXME: Update DrawAction to use this "setCursor-style" and move function
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348 | * to MapMode.
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349 | * @param c
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350 | */
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351 | private void setCursor(final Cursors c) {
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352 | if(currCursor.equals(c) || (!drawTargetCursor && currCursor.equals(Cursors.none)))
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353 | return;
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354 | try {
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355 | // We invoke this to prevent strange things from happening
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356 | EventQueue.invokeLater(new Runnable() {
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357 | public void run() {
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358 | // Don't change cursor when mode has changed already
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359 | if(!(Main.map.mapMode instanceof DeleteAction))
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360 | return;
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361 |
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362 | Main.map.mapView.setCursor(c.cursor());
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363 | //System.out.println("Set cursor to: " + c.name());
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364 | }
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365 | });
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366 | currCursor = c;
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367 | } catch(Exception e) {}
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368 | }
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369 |
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370 | /**
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371 | * This is required to update the cursors when ctrl/shift/alt is pressed
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372 | */
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373 | public void eventDispatched(AWTEvent e) {
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374 | // We don't have a mouse event, so we pass the old mouse event but the
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375 | // new modifiers.
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376 | updateCursor(oldEvent, ((InputEvent)e).getModifiers());
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377 | }
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378 | }
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