1 | // License: GPL. See LICENSE file for details.
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2 |
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3 | package org.openstreetmap.josm.gui.layer;
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4 |
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5 | import static org.openstreetmap.josm.tools.I18n.tr;
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6 |
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7 | import java.awt.Component;
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8 | import java.awt.Graphics;
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9 | import java.awt.event.ActionEvent;
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10 | import java.beans.PropertyChangeListener;
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11 | import java.beans.PropertyChangeSupport;
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12 | import java.io.File;
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13 | import java.util.Collection;
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14 | import java.util.concurrent.CopyOnWriteArrayList;
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15 |
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16 | import javax.swing.AbstractAction;
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17 | import javax.swing.Icon;
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18 |
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19 | import org.openstreetmap.josm.actions.GpxExportAction;
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20 | import org.openstreetmap.josm.actions.SaveAction;
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21 | import org.openstreetmap.josm.actions.SaveAsAction;
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22 | import org.openstreetmap.josm.data.osm.visitor.BoundingXYVisitor;
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23 | import org.openstreetmap.josm.gui.MapView;
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24 | import org.openstreetmap.josm.tools.Destroyable;
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25 | import org.openstreetmap.josm.tools.ImageProvider;
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26 |
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27 | /**
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28 | * A layer encapsulates the gui component of one dataset and its representation.
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29 | *
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30 | * Some layers may display data directly imported from OSM server. Other only
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31 | * display background images. Some can be edited, some not. Some are static and
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32 | * other changes dynamically (auto-updated).
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33 | *
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34 | * Layers can be visible or not. Most actions the user can do applies only on
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35 | * selected layers. The available actions depend on the selected layers too.
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36 | *
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37 | * All layers are managed by the MapView. They are displayed in a list to the
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38 | * right of the screen.
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39 | *
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40 | * @author imi
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41 | */
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42 | abstract public class Layer implements Destroyable, MapViewPaintable {
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43 | static public final String VISIBLE_PROP = Layer.class.getName() + ".visible";
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44 | static public final String NAME_PROP = Layer.class.getName() + ".name";
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45 |
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46 | /** keeps track of property change listeners */
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47 | private PropertyChangeSupport propertyChangeSupport;
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48 |
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49 | /**
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50 | * Interface to notify listeners of the change of the active layer.
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51 | * @author imi
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52 | */
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53 | public interface LayerChangeListener {
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54 | void activeLayerChange(Layer oldLayer, Layer newLayer);
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55 | void layerAdded(Layer newLayer);
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56 | void layerRemoved(Layer oldLayer);
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57 | }
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58 |
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59 | /**
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60 | * The listener of the active layer changes. You may register/deregister yourself
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61 | * while an LayerChangeListener - action is executed.
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62 | */
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63 | public static final Collection<LayerChangeListener> listeners = new CopyOnWriteArrayList<LayerChangeListener>();
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64 |
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65 | /**
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66 | * The visibility state of the layer.
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67 | *
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68 | */
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69 | private boolean visible = true;
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70 |
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71 | /**
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72 | * The layer should be handled as a background layer in automatic handling
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73 | */
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74 | public boolean background = false;
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75 |
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76 | /**
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77 | * The name of this layer.
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78 | *
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79 | */
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80 | private String name;
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81 |
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82 | /**
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83 | * If a file is associated with this layer, this variable should be set to it.
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84 | */
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85 | private File associatedFile;
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86 |
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87 | /**
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88 | * Create the layer and fill in the necessary components.
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89 | */
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90 | public Layer(String name) {
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91 | this.propertyChangeSupport = new PropertyChangeSupport(this);
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92 | setName(name);
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93 | }
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94 |
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95 | /**
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96 | * Paint the dataset using the engine set.
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97 | * @param mv The object that can translate GeoPoints to screen coordinates.
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98 | */
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99 | abstract public void paint(Graphics g, MapView mv);
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100 | /**
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101 | * Return a representative small image for this layer. The image must not
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102 | * be larger than 64 pixel in any dimension.
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103 | */
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104 | abstract public Icon getIcon();
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105 |
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106 | /**
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107 | * @return A small tooltip hint about some statistics for this layer.
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108 | */
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109 | abstract public String getToolTipText();
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110 |
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111 | /**
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112 | * Merges the given layer into this layer. Throws if the layer types are
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113 | * incompatible.
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114 | * @param from The layer that get merged into this one. After the merge,
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115 | * the other layer is not usable anymore and passing to one others
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116 | * mergeFrom should be one of the last things to do with a layer.
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117 | */
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118 | abstract public void mergeFrom(Layer from);
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119 |
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120 | /**
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121 | * @param other The other layer that is tested to be mergable with this.
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122 | * @return Whether the other layer can be merged into this layer.
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123 | */
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124 | abstract public boolean isMergable(Layer other);
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125 |
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126 | abstract public void visitBoundingBox(BoundingXYVisitor v);
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127 |
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128 | abstract public Object getInfoComponent();
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129 |
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130 | abstract public Component[] getMenuEntries();
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131 |
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132 | /**
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133 | * Called, when the layer is removed from the mapview and is going to be
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134 | * destroyed.
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135 | *
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136 | * This is because the Layer constructor can not add itself safely as listener
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137 | * to the layerlist dialog, because there may be no such dialog yet (loaded
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138 | * via command line parameter).
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139 | */
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140 | public void destroy() {}
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141 |
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142 | public File getAssociatedFile() { return associatedFile; }
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143 | public void setAssociatedFile(File file) { associatedFile = file; }
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144 |
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145 |
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146 | /**
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147 | * Replies the name of the layer
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148 | *
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149 | * @return the name of the layer
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150 | */
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151 | public String getName() {
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152 | return name;
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153 | }
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154 |
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155 | /**
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156 | * Sets the name of the layer
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157 | *
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158 | *@param name the name. If null, the name is set to the empty string.
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159 | *
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160 | */
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161 | public void setName(String name) {
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162 | if (name == null) {
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163 | name = "";
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164 | }
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165 | String oldValue = this.name;
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166 | this.name = name;
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167 | if (!this.name.equals(oldValue)) {
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168 | propertyChangeSupport.firePropertyChange(NAME_PROP, oldValue, this.name);
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169 | }
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170 | }
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171 |
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172 |
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173 | public static class LayerSaveAction extends AbstractAction {
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174 | private Layer layer;
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175 | public LayerSaveAction(Layer layer) {
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176 | putValue(SMALL_ICON, ImageProvider.get("save"));
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177 | putValue(SHORT_DESCRIPTION, tr("Save the current data."));
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178 | putValue(NAME, tr("Save"));
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179 | setEnabled(true);
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180 | this.layer = layer;
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181 | }
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182 |
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183 | public void actionPerformed(ActionEvent e) {
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184 | new SaveAction().doSave(layer);
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185 |
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186 | }
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187 | }
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188 |
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189 | public static class LayerSaveAsAction extends AbstractAction {
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190 | private Layer layer;
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191 | public LayerSaveAsAction(Layer layer) {
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192 | putValue(SMALL_ICON, ImageProvider.get("save_as"));
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193 | putValue(SHORT_DESCRIPTION, tr("Save the current data to a new file."));
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194 | putValue(NAME, tr("Save As..."));
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195 | setEnabled(true);
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196 | this.layer = layer;
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197 | }
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198 |
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199 | public void actionPerformed(ActionEvent e) {
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200 | new SaveAsAction().doSave(layer);
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201 | }
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202 | }
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203 |
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204 | public static class LayerGpxExportAction extends AbstractAction {
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205 | private Layer layer;
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206 | public LayerGpxExportAction(Layer layer) {
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207 | putValue(SMALL_ICON, ImageProvider.get("exportgpx"));
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208 | putValue(SHORT_DESCRIPTION, tr("Export the data to GPX file."));
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209 | putValue(NAME, tr("Export to GPX..."));
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210 | setEnabled(true);
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211 | this.layer = layer;
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212 | }
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213 |
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214 | public void actionPerformed(ActionEvent e) {
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215 | new GpxExportAction().export(layer);
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216 | }
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217 | }
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218 |
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219 | /**
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220 | * Sets the visibility of this layer. Emits property change event for
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221 | * property {@see #VISIBLE_PROP}.
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222 | *
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223 | * @param visible true, if the layer is visible; false, otherwise.
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224 | */
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225 | public void setVisible(boolean visible) {
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226 | boolean oldValue = this.visible;
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227 | this.visible = visible;
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228 | if (oldValue != this.visible) {
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229 | fireVisibleChanged(oldValue, this.visible);
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230 | }
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231 | }
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232 |
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233 | /**
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234 | * Replies true if this layer is visible. False, otherwise.
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235 | * @return true if this layer is visible. False, otherwise.
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236 | */
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237 | public boolean isVisible() {
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238 | return visible;
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239 | }
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240 |
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241 | /**
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242 | * Toggles the visibility state of this layer.
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243 | */
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244 | public void toggleVisible() {
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245 | setVisible(!isVisible());
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246 | }
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247 |
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248 | /**
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249 | * Adds a {@see PropertyChangeListener}
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250 | *
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251 | * @param listener the listener
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252 | */
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253 | public void addPropertyChangeListener(PropertyChangeListener listener) {
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254 | propertyChangeSupport.addPropertyChangeListener(listener);
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255 | }
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256 |
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257 | /**
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258 | * Removes a {@see PropertyChangeListener}
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259 | *
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260 | * @param listener the listener
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261 | */
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262 | public void removePropertyChangeListener(PropertyChangeListener listener) {
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263 | propertyChangeSupport.removePropertyChangeListener(listener);
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264 | }
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265 |
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266 | /**
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267 | * fires a property change for the property {@see #VISIBLE_PROP}
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268 | *
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269 | * @param oldValue the old value
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270 | * @param newValue the new value
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271 | */
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272 | protected void fireVisibleChanged(boolean oldValue, boolean newValue) {
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273 | propertyChangeSupport.firePropertyChange(VISIBLE_PROP, oldValue, newValue);
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274 | }
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275 | }
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