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.Color;
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8 | import java.awt.Component;
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9 | import java.awt.Graphics2D;
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10 | import java.awt.event.ActionEvent;
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11 | import java.beans.PropertyChangeListener;
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12 | import java.beans.PropertyChangeSupport;
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13 | import java.io.File;
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14 | import java.util.List;
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15 |
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16 | import javax.swing.AbstractAction;
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17 | import javax.swing.Action;
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18 | import javax.swing.Icon;
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19 | import javax.swing.JOptionPane;
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20 | import javax.swing.JSeparator;
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21 |
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22 | import org.openstreetmap.josm.Main;
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23 | import org.openstreetmap.josm.actions.GpxExportAction;
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24 | import org.openstreetmap.josm.actions.SaveAction;
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25 | import org.openstreetmap.josm.actions.SaveAsAction;
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26 | import org.openstreetmap.josm.data.Bounds;
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27 | import org.openstreetmap.josm.data.osm.visitor.BoundingXYVisitor;
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28 | import org.openstreetmap.josm.data.projection.Projection;
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29 | import org.openstreetmap.josm.data.projection.ProjectionChangeListener;
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30 | import org.openstreetmap.josm.gui.MapView;
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31 | import org.openstreetmap.josm.tools.Destroyable;
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32 | import org.openstreetmap.josm.tools.ImageProvider;
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33 |
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34 | /**
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35 | * A layer encapsulates the gui component of one dataset and its representation.
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36 | *
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37 | * Some layers may display data directly imported from OSM server. Other only
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38 | * display background images. Some can be edited, some not. Some are static and
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39 | * other changes dynamically (auto-updated).
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40 | *
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41 | * Layers can be visible or not. Most actions the user can do applies only on
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42 | * selected layers. The available actions depend on the selected layers too.
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43 | *
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44 | * All layers are managed by the MapView. They are displayed in a list to the
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45 | * right of the screen.
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46 | *
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47 | * @author imi
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48 | */
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49 | abstract public class Layer implements Destroyable, MapViewPaintable, ProjectionChangeListener {
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50 |
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51 | public interface LayerAction {
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52 | boolean supportLayers(List<Layer> layers);
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53 | Component createMenuComponent();
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54 | }
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55 |
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56 | public interface MultiLayerAction {
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57 | Action getMultiLayerAction(List<Layer> layers);
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58 | }
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59 |
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60 |
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61 | /**
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62 | * Special class that can be returned by getMenuEntries when JSeparator needs to be created
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63 | *
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64 | */
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65 | public static class SeparatorLayerAction extends AbstractAction implements LayerAction {
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66 | public static final SeparatorLayerAction INSTANCE = new SeparatorLayerAction();
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67 | @Override
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68 | public void actionPerformed(ActionEvent e) {
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69 | throw new UnsupportedOperationException();
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70 | }
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71 | @Override
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72 | public Component createMenuComponent() {
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73 | return new JSeparator();
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74 | }
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75 | @Override
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76 | public boolean supportLayers(List<Layer> layers) {
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77 | return false;
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78 | }
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79 | }
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80 |
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81 | static public final String VISIBLE_PROP = Layer.class.getName() + ".visible";
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82 | static public final String OPACITY_PROP = Layer.class.getName() + ".opacity";
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83 | static public final String NAME_PROP = Layer.class.getName() + ".name";
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84 |
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85 | /** keeps track of property change listeners */
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86 | protected PropertyChangeSupport propertyChangeSupport;
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87 |
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88 | /**
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89 | * The visibility state of the layer.
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90 | *
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91 | */
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92 | private boolean visible = true;
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93 |
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94 | /**
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95 | * The opacity of the layer.
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96 | *
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97 | */
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98 | private double opacity = 1;
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99 |
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100 | /**
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101 | * The layer should be handled as a background layer in automatic handling
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102 | *
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103 | */
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104 | private boolean background = false;
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105 |
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106 | /**
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107 | * The name of this layer.
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108 | *
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109 | */
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110 | private String name;
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111 |
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112 | /**
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113 | * If a file is associated with this layer, this variable should be set to it.
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114 | */
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115 | private File associatedFile;
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116 |
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117 | /**
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118 | * Create the layer and fill in the necessary components.
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119 | */
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120 | public Layer(String name) {
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121 | this.propertyChangeSupport = new PropertyChangeSupport(this);
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122 | setName(name);
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123 | }
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124 |
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125 | /**
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126 | * Paint the dataset using the engine set.
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127 | * @param mv The object that can translate GeoPoints to screen coordinates.
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128 | */
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129 | @Override
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130 | abstract public void paint(Graphics2D g, MapView mv, Bounds box);
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131 | /**
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132 | * Return a representative small image for this layer. The image must not
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133 | * be larger than 64 pixel in any dimension.
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134 | */
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135 | abstract public Icon getIcon();
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136 |
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137 | /**
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138 | * Return a Color for this layer. Return null when no color specified.
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139 | * @param ignoreCustom Custom color should return null, as no default color
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140 | * is used. When this is true, then even for custom coloring the base
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141 | * color is returned - mainly for layer internal use.
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142 | */
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143 | public Color getColor(boolean ignoreCustom) {
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144 | return null;
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145 | }
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146 |
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147 | /**
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148 | * @return A small tooltip hint about some statistics for this layer.
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149 | */
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150 | abstract public String getToolTipText();
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151 |
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152 | /**
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153 | * Merges the given layer into this layer. Throws if the layer types are
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154 | * incompatible.
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155 | * @param from The layer that get merged into this one. After the merge,
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156 | * the other layer is not usable anymore and passing to one others
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157 | * mergeFrom should be one of the last things to do with a layer.
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158 | */
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159 | abstract public void mergeFrom(Layer from);
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160 |
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161 | /**
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162 | * @param other The other layer that is tested to be mergable with this.
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163 | * @return Whether the other layer can be merged into this layer.
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164 | */
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165 | abstract public boolean isMergable(Layer other);
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166 |
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167 | abstract public void visitBoundingBox(BoundingXYVisitor v);
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168 |
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169 | abstract public Object getInfoComponent();
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170 |
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171 | /**
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172 | * Returns list of actions. Action can implement LayerAction interface when it needs to be represented by other
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173 | * menu component than JMenuItem or when it supports multiple layers. Actions that support multiple layers should also
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174 | * have correct equals implementation.
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175 | *
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176 | * Use SeparatorLayerAction.INSTANCE instead of new JSeparator
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177 | *
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178 | */
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179 | abstract public Action[] getMenuEntries();
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180 |
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181 | /**
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182 | * Called, when the layer is removed from the mapview and is going to be
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183 | * destroyed.
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184 | *
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185 | * This is because the Layer constructor can not add itself safely as listener
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186 | * to the layerlist dialog, because there may be no such dialog yet (loaded
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187 | * via command line parameter).
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188 | */
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189 | @Override
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190 | public void destroy() {}
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191 |
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192 | public File getAssociatedFile() { return associatedFile; }
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193 | public void setAssociatedFile(File file) { associatedFile = file; }
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194 |
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195 | /**
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196 | * Replies the name of the layer
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197 | *
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198 | * @return the name of the layer
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199 | */
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200 | public String getName() {
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201 | return name;
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202 | }
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203 |
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204 | /**
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205 | * Sets the name of the layer
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206 | *
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207 | *@param name the name. If null, the name is set to the empty string.
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208 | *
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209 | */
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210 | public void setName(String name) {
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211 | if (name == null) {
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212 | name = "";
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213 | }
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214 | String oldValue = this.name;
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215 | this.name = name;
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216 | if (!this.name.equals(oldValue)) {
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217 | propertyChangeSupport.firePropertyChange(NAME_PROP, oldValue, this.name);
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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 | * Replies true if this layer is a background layer
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223 | *
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224 | * @return true if this layer is a background layer
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225 | */
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226 | public boolean isBackgroundLayer() {
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227 | return background;
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228 | }
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229 |
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230 | /**
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231 | * Sets whether this layer is a background layer
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232 | *
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233 | * @param background true, if this layer is a background layer
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234 | */
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235 | public void setBackgroundLayer(boolean background) {
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236 | this.background = background;
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237 | }
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238 |
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239 | /**
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240 | * Sets the visibility of this layer. Emits property change event for
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241 | * property {@see #VISIBLE_PROP}.
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242 | *
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243 | * @param visible true, if the layer is visible; false, otherwise.
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244 | */
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245 | public void setVisible(boolean visible) {
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246 | boolean oldValue = isVisible();
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247 | this.visible = visible;
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248 | if (visible && opacity == 0) {
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249 | setOpacity(1);
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250 | } else if (oldValue != isVisible()) {
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251 | fireVisibleChanged(oldValue, isVisible());
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252 | }
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253 | }
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254 |
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255 | /**
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256 | * Replies true if this layer is visible. False, otherwise.
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257 | * @return true if this layer is visible. False, otherwise.
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258 | */
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259 | public boolean isVisible() {
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260 | return visible && opacity != 0;
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261 | }
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262 |
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263 | public double getOpacity() {
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264 | return opacity;
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265 | }
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266 |
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267 | public void setOpacity(double opacity) {
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268 | if (!(opacity >= 0 && opacity <= 1))
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269 | throw new IllegalArgumentException("Opacity value must be between 0 and 1");
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270 | double oldOpacity = getOpacity();
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271 | boolean oldVisible = isVisible();
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272 | this.opacity = opacity;
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273 | if (oldOpacity != getOpacity()) {
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274 | fireOpacityChanged(oldOpacity, getOpacity());
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275 | }
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276 | if (oldVisible != isVisible()) {
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277 | fireVisibleChanged(oldVisible, isVisible());
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278 | }
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279 | }
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280 |
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281 | /**
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282 | * Toggles the visibility state of this layer.
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283 | */
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284 | public void toggleVisible() {
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285 | setVisible(!isVisible());
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286 | }
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287 |
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288 | /**
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289 | * Adds a {@see PropertyChangeListener}
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290 | *
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291 | * @param listener the listener
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292 | */
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293 | public void addPropertyChangeListener(PropertyChangeListener listener) {
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294 | propertyChangeSupport.addPropertyChangeListener(listener);
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295 | }
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296 |
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297 | /**
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298 | * Removes a {@see PropertyChangeListener}
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299 | *
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300 | * @param listener the listener
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301 | */
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302 | public void removePropertyChangeListener(PropertyChangeListener listener) {
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303 | propertyChangeSupport.removePropertyChangeListener(listener);
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304 | }
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305 |
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306 | /**
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307 | * fires a property change for the property {@see #VISIBLE_PROP}
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308 | *
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309 | * @param oldValue the old value
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310 | * @param newValue the new value
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311 | */
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312 | protected void fireVisibleChanged(boolean oldValue, boolean newValue) {
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313 | propertyChangeSupport.firePropertyChange(VISIBLE_PROP, oldValue, newValue);
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314 | }
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315 |
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316 | /**
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317 | * fires a property change for the property {@see #OPACITY_PROP}
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318 | *
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319 | * @param oldValue the old value
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320 | * @param newValue the new value
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321 | */
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322 | protected void fireOpacityChanged(double oldValue, double newValue) {
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323 | propertyChangeSupport.firePropertyChange(OPACITY_PROP, oldValue, newValue);
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324 | }
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325 |
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326 | /**
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327 | * Check changed status of layer
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328 | *
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329 | * @return True if layer was changed since last paint
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330 | */
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331 | public boolean isChanged() {
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332 | return true;
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333 | }
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334 |
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335 | /**
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336 | * allows to check whether a projection is supported or not
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337 | *
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338 | * @return True if projection is supported for this layer
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339 | */
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340 | public boolean isProjectionSupported(Projection proj) {
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341 | return true;
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342 | }
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343 |
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344 | /**
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345 | * Specify user information about projections
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346 | *
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347 | * @return User readable text telling about supported projections
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348 | */
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349 | public String nameSupportedProjections() {
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350 | return tr("All projections are supported");
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351 | }
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352 |
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353 | /**
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354 | * The action to save a layer
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355 | *
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356 | */
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357 | public static class LayerSaveAction extends AbstractAction {
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358 | private Layer layer;
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359 | public LayerSaveAction(Layer layer) {
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360 | putValue(SMALL_ICON, ImageProvider.get("save"));
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361 | putValue(SHORT_DESCRIPTION, tr("Save the current data."));
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362 | putValue(NAME, tr("Save"));
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363 | setEnabled(true);
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364 | this.layer = layer;
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365 | }
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366 |
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367 | public void actionPerformed(ActionEvent e) {
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368 | new SaveAction().doSave(layer);
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369 | }
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370 | }
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371 |
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372 | public static class LayerSaveAsAction extends AbstractAction {
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373 | private Layer layer;
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374 | public LayerSaveAsAction(Layer layer) {
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375 | putValue(SMALL_ICON, ImageProvider.get("save_as"));
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376 | putValue(SHORT_DESCRIPTION, tr("Save the current data to a new file."));
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377 | putValue(NAME, tr("Save As..."));
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378 | setEnabled(true);
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379 | this.layer = layer;
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380 | }
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381 |
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382 | public void actionPerformed(ActionEvent e) {
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383 | new SaveAsAction().doSave(layer);
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384 | }
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385 | }
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386 |
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387 | public static class LayerGpxExportAction extends AbstractAction {
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388 | private Layer layer;
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389 | public LayerGpxExportAction(Layer layer) {
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390 | putValue(SMALL_ICON, ImageProvider.get("exportgpx"));
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391 | putValue(SHORT_DESCRIPTION, tr("Export the data to GPX file."));
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392 | putValue(NAME, tr("Export to GPX..."));
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393 | setEnabled(true);
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394 | this.layer = layer;
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395 | }
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396 |
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397 | public void actionPerformed(ActionEvent e) {
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398 | new GpxExportAction().export(layer);
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399 | }
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400 | }
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401 |
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402 | /* --------------------------------------------------------------------------------- */
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403 | /* interface ProjectionChangeListener */
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404 | /* --------------------------------------------------------------------------------- */
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405 | @Override
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406 | public void projectionChanged(Projection oldValue, Projection newValue) {
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407 | if(!isProjectionSupported(newValue)) {
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408 | JOptionPane.showMessageDialog(Main.parent,
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409 | tr("The layer {0} does not support the new projection {1}.\n{2}\n"
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410 | + "Change the projection again or remove the layer.",
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411 | getName(), newValue.toCode(), nameSupportedProjections()),
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412 | tr("Warning"),
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413 | JOptionPane.WARNING_MESSAGE);
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414 | }
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415 | }
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416 | }
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