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.Graphics2D;
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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.Bounds;
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23 | import org.openstreetmap.josm.data.osm.visitor.BoundingXYVisitor;
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24 | import org.openstreetmap.josm.gui.MapView;
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25 | import org.openstreetmap.josm.tools.Destroyable;
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26 | import org.openstreetmap.josm.tools.ImageProvider;
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27 |
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28 | /**
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29 | * A layer encapsulates the gui component of one dataset and its representation.
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30 | *
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31 | * Some layers may display data directly imported from OSM server. Other only
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32 | * display background images. Some can be edited, some not. Some are static and
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33 | * other changes dynamically (auto-updated).
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34 | *
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35 | * Layers can be visible or not. Most actions the user can do applies only on
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36 | * selected layers. The available actions depend on the selected layers too.
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37 | *
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38 | * All layers are managed by the MapView. They are displayed in a list to the
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39 | * right of the screen.
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40 | *
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41 | * @author imi
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42 | */
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43 | abstract public class Layer implements Destroyable, MapViewPaintable {
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44 | static public final String VISIBLE_PROP = Layer.class.getName() + ".visible";
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45 | static public final String NAME_PROP = Layer.class.getName() + ".name";
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46 |
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47 | /** keeps track of property change listeners */
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48 | protected PropertyChangeSupport propertyChangeSupport;
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49 |
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50 | /**
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51 | * Interface to notify listeners of the change of the active layer.
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52 | * @author imi
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53 | */
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54 | public interface LayerChangeListener {
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55 | void activeLayerChange(Layer oldLayer, Layer newLayer);
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56 | void layerAdded(Layer newLayer);
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57 | void layerRemoved(Layer oldLayer);
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58 | }
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59 |
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60 | /**
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61 | * The listener of the active layer changes. You may register/deregister yourself
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62 | * while an LayerChangeListener - action is executed.
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63 | *
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64 | * @deprecated use {@see #addLayerChangeListener(LayerChangeListener)}
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65 | * and {@see #removeLayerChangeListener(LayerChangeListener)}
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66 | */
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67 | @Deprecated
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68 | public static final Collection<LayerChangeListener> listeners = new CopyOnWriteArrayList<LayerChangeListener>();
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69 |
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70 | /**
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71 | * Adds a layer change listener
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72 | *
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73 | * @param listener the listener. Ignored if null or already registered.
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74 | */
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75 | public static void addLayerChangeListener(LayerChangeListener listener) {
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76 | if (listener != null && ! listeners.contains(listener)) {
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77 | listeners.add(listener);
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78 | }
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79 | }
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80 |
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81 | /**
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82 | * Removes a layer change listener
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83 | *
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84 | * @param listener the listener. Ignored if null or already registered.
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85 | */
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86 | public static void removeLayerChangeListener(LayerChangeListener listener) {
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87 | if (listener != null && listeners.contains(listener)) {
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88 | listeners.remove(listener);
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89 | }
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90 | }
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91 |
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92 | /**
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93 | * The visibility state of the layer.
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94 | *
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95 | */
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96 | private boolean visible = true;
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97 |
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98 | /**
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99 | * The layer should be handled as a background layer in automatic handling
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100 | *
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101 | */
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102 | private boolean background = false;
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103 |
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104 | /**
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105 | * The name of this layer.
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106 | *
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107 | */
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108 | private String name;
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109 |
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110 | /**
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111 | * If a file is associated with this layer, this variable should be set to it.
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112 | */
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113 | private File associatedFile;
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114 |
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115 | /**
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116 | * Create the layer and fill in the necessary components.
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117 | */
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118 | public Layer(String name) {
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119 | this.propertyChangeSupport = new PropertyChangeSupport(this);
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120 | setName(name);
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121 | }
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122 |
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123 | /**
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124 | * Paint the dataset using the engine set.
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125 | * @param mv The object that can translate GeoPoints to screen coordinates.
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126 | */
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127 | abstract public void paint(Graphics2D g, MapView mv, Bounds box);
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128 | /**
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129 | * Return a representative small image for this layer. The image must not
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130 | * be larger than 64 pixel in any dimension.
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131 | */
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132 | abstract public Icon getIcon();
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133 |
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134 | /**
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135 | * @return A small tooltip hint about some statistics for this layer.
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136 | */
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137 | abstract public String getToolTipText();
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138 |
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139 | /**
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140 | * Merges the given layer into this layer. Throws if the layer types are
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141 | * incompatible.
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142 | * @param from The layer that get merged into this one. After the merge,
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143 | * the other layer is not usable anymore and passing to one others
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144 | * mergeFrom should be one of the last things to do with a layer.
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145 | */
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146 | abstract public void mergeFrom(Layer from);
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147 |
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148 | /**
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149 | * @param other The other layer that is tested to be mergable with this.
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150 | * @return Whether the other layer can be merged into this layer.
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151 | */
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152 | abstract public boolean isMergable(Layer other);
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153 |
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154 | abstract public void visitBoundingBox(BoundingXYVisitor v);
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155 |
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156 | abstract public Object getInfoComponent();
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157 |
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158 | abstract public Component[] getMenuEntries();
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159 |
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160 | /**
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161 | * Called, when the layer is removed from the mapview and is going to be
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162 | * destroyed.
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163 | *
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164 | * This is because the Layer constructor can not add itself safely as listener
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165 | * to the layerlist dialog, because there may be no such dialog yet (loaded
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166 | * via command line parameter).
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167 | */
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168 | public void destroy() {}
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169 |
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170 | public File getAssociatedFile() { return associatedFile; }
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171 | public void setAssociatedFile(File file) { associatedFile = file; }
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172 |
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173 | /**
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174 | * Replies the name of the layer
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175 | *
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176 | * @return the name of the layer
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177 | */
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178 | public String getName() {
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179 | return name;
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180 | }
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181 |
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182 | /**
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183 | * Sets the name of the layer
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184 | *
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185 | *@param name the name. If null, the name is set to the empty string.
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186 | *
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187 | */
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188 | public void setName(String name) {
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189 | if (name == null) {
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190 | name = "";
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191 | }
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192 | String oldValue = this.name;
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193 | this.name = name;
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194 | if (!this.name.equals(oldValue)) {
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195 | propertyChangeSupport.firePropertyChange(NAME_PROP, oldValue, this.name);
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196 | }
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197 | }
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198 |
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199 | /**
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200 | * Replies true if this layer is a background layer
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201 | *
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202 | * @return true if this layer is a background layer
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203 | */
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204 | public boolean isBackgroundLayer() {
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205 | return background;
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206 | }
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207 |
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208 | /**
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209 | * Sets whether this layer is a background layer
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210 | *
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211 | * @param background true, if this layer is a background layer
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212 | */
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213 | public void setBackgroundLayer(boolean background) {
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214 | this.background = background;
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215 | }
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216 |
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217 | /**
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218 | * Sets the visibility of this layer. Emits property change event for
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219 | * property {@see #VISIBLE_PROP}.
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220 | *
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221 | * @param visible true, if the layer is visible; false, otherwise.
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222 | */
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223 | public void setVisible(boolean visible) {
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224 | boolean oldValue = this.visible;
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225 | this.visible = visible;
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226 | if (oldValue != this.visible) {
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227 | fireVisibleChanged(oldValue, this.visible);
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228 | }
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229 | }
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230 |
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231 | /**
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232 | * Replies true if this layer is visible. False, otherwise.
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233 | * @return true if this layer is visible. False, otherwise.
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234 | */
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235 | public boolean isVisible() {
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236 | return visible;
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237 | }
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238 |
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239 | /**
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240 | * Toggles the visibility state of this layer.
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241 | */
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242 | public void toggleVisible() {
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243 | setVisible(!isVisible());
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244 | }
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245 |
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246 | /**
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247 | * Adds a {@see PropertyChangeListener}
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248 | *
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249 | * @param listener the listener
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250 | */
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251 | public void addPropertyChangeListener(PropertyChangeListener listener) {
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252 | propertyChangeSupport.addPropertyChangeListener(listener);
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253 | }
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254 |
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255 | /**
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256 | * Removes a {@see PropertyChangeListener}
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257 | *
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258 | * @param listener the listener
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259 | */
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260 | public void removePropertyChangeListener(PropertyChangeListener listener) {
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261 | propertyChangeSupport.removePropertyChangeListener(listener);
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262 | }
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263 |
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264 | /**
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265 | * fires a property change for the property {@see #VISIBLE_PROP}
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266 | *
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267 | * @param oldValue the old value
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268 | * @param newValue the new value
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269 | */
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270 | protected void fireVisibleChanged(boolean oldValue, boolean newValue) {
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271 | propertyChangeSupport.firePropertyChange(VISIBLE_PROP, oldValue, newValue);
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272 | }
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273 |
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274 | /**
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275 | * The action to save a layer
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276 | *
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277 | */
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278 | public static class LayerSaveAction extends AbstractAction {
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279 | private Layer layer;
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280 | public LayerSaveAction(Layer layer) {
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281 | putValue(SMALL_ICON, ImageProvider.get("save"));
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282 | putValue(SHORT_DESCRIPTION, tr("Save the current data."));
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283 | putValue(NAME, tr("Save"));
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284 | setEnabled(true);
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285 | this.layer = layer;
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286 | }
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287 |
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288 | public void actionPerformed(ActionEvent e) {
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289 | new SaveAction().doSave(layer);
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290 | }
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291 | }
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292 |
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293 | public static class LayerSaveAsAction extends AbstractAction {
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294 | private Layer layer;
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295 | public LayerSaveAsAction(Layer layer) {
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296 | putValue(SMALL_ICON, ImageProvider.get("save_as"));
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297 | putValue(SHORT_DESCRIPTION, tr("Save the current data to a new file."));
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298 | putValue(NAME, tr("Save As..."));
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299 | setEnabled(true);
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300 | this.layer = layer;
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301 | }
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302 |
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303 | public void actionPerformed(ActionEvent e) {
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304 | new SaveAsAction().doSave(layer);
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305 | }
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306 | }
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307 |
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308 | public static class LayerGpxExportAction extends AbstractAction {
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309 | private Layer layer;
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310 | public LayerGpxExportAction(Layer layer) {
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311 | putValue(SMALL_ICON, ImageProvider.get("exportgpx"));
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312 | putValue(SHORT_DESCRIPTION, tr("Export the data to GPX file."));
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313 | putValue(NAME, tr("Export to GPX..."));
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314 | setEnabled(true);
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315 | this.layer = layer;
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316 | }
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317 |
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318 | public void actionPerformed(ActionEvent e) {
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319 | new GpxExportAction().export(layer);
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320 | }
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321 | }
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322 | }
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