1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.layer;
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3 |
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4 | import java.util.ArrayList;
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5 | import java.util.Collections;
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6 | import java.util.List;
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7 | import java.util.concurrent.CopyOnWriteArrayList;
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8 |
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9 | import org.openstreetmap.josm.gui.util.GuiHelper;
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10 | import org.openstreetmap.josm.tools.Utils;
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11 | import org.openstreetmap.josm.tools.bugreport.BugReport;
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12 |
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13 | /**
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14 | * This class handles the layer management.
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15 | * <p>
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16 | * This manager handles a list of layers with the first layer being the front layer.
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17 | * <h1>Threading</h1>
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18 | * Methods of this manager may be called from any thread in any order.
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19 | * Listeners are called while this layer manager is locked, so they should not block.
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20 | *
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21 | * @author Michael Zangl
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22 | * @since 10273
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23 | */
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24 | public class LayerManager {
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25 | /**
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26 | * Interface to notify listeners of a layer change.
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27 | */
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28 | public interface LayerChangeListener {
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29 | /**
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30 | * Notifies this listener that a layer has been added.
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31 | * <p>
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32 | * Listeners are called in the EDT thread and you can manipulate the layer manager in the current thread.
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33 | * @param e The new added layer event
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34 | */
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35 | void layerAdded(LayerAddEvent e);
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36 |
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37 | /**
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38 | * Notifies this listener that a layer is about to be removed.
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39 | * <p>
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40 | * Listeners are called in the EDT thread and you can manipulate the layer manager in the current thread.
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41 | * @param e The layer to be removed (as event)
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42 | */
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43 | void layerRemoving(LayerRemoveEvent e);
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44 |
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45 | /**
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46 | * Notifies this listener that the order of layers was changed.
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47 | * <p>
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48 | * Listeners are called in the EDT thread and you can manipulate the layer manager in the current thread.
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49 | * @param e The order change event.
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50 | */
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51 | void layerOrderChanged(LayerOrderChangeEvent e);
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52 | }
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53 |
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54 | protected static class LayerManagerEvent {
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55 | private final LayerManager source;
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56 |
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57 | LayerManagerEvent(LayerManager source) {
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58 | this.source = source;
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59 | }
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60 |
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61 | public LayerManager getSource() {
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62 | return source;
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63 | }
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64 | }
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65 |
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66 | /**
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67 | * The event that is fired whenever a layer was added.
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68 | * @author Michael Zangl
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69 | */
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70 | public static class LayerAddEvent extends LayerManagerEvent {
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71 | private final Layer addedLayer;
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72 |
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73 | LayerAddEvent(LayerManager source, Layer addedLayer) {
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74 | super(source);
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75 | this.addedLayer = addedLayer;
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76 | }
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77 |
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78 | /**
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79 | * Gets the layer that was added.
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80 | * @return The added layer.
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81 | */
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82 | public Layer getAddedLayer() {
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83 | return addedLayer;
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84 | }
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85 |
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86 | @Override
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87 | public String toString() {
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88 | return "LayerAddEvent [addedLayer=" + addedLayer + ']';
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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 event that is fired before removing a layer.
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94 | * @author Michael Zangl
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95 | */
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96 | public static class LayerRemoveEvent extends LayerManagerEvent {
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97 | private final Layer removedLayer;
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98 | private final boolean lastLayer;
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99 |
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100 | LayerRemoveEvent(LayerManager source, Layer removedLayer) {
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101 | super(source);
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102 | this.removedLayer = removedLayer;
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103 | this.lastLayer = source.getLayers().size() == 1;
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104 | }
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105 |
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106 | /**
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107 | * Gets the layer that is about to be removed.
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108 | * @return The layer.
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109 | */
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110 | public Layer getRemovedLayer() {
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111 | return removedLayer;
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112 | }
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113 |
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114 | /**
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115 | * Check if the layer that was removed is the last layer in the list.
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116 | * @return <code>true</code> if this was the last layer.
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117 | * @since 10432
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118 | */
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119 | public boolean isLastLayer() {
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120 | return lastLayer;
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121 | }
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122 |
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123 | @Override
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124 | public String toString() {
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125 | return "LayerRemoveEvent [removedLayer=" + removedLayer + ", lastLayer=" + lastLayer + ']';
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126 | }
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127 | }
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128 |
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129 | /**
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130 | * An event that is fired whenever the order of layers changed.
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131 | * <p>
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132 | * We currently do not report the exact changes.
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133 | * @author Michael Zangl
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134 | */
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135 | public static class LayerOrderChangeEvent extends LayerManagerEvent {
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136 | LayerOrderChangeEvent(LayerManager source) {
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137 | super(source);
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138 | }
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139 |
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140 | @Override
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141 | public String toString() {
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142 | return "LayerOrderChangeEvent []";
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143 | }
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144 | }
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145 |
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146 | /**
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147 | * This is the list of layers we manage.
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148 | */
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149 | private final List<Layer> layers = new ArrayList<>();
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150 |
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151 | private final List<LayerChangeListener> layerChangeListeners = new CopyOnWriteArrayList<>();
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152 |
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153 | /**
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154 | * Add a layer. The layer will be added at a given psoition.
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155 | * @param layer The layer to add
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156 | */
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157 | public void addLayer(final Layer layer) {
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158 | // we force this on to the EDT Thread to make events fire from there.
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159 | // The synchronization lock needs to be held by the EDT.
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160 | GuiHelper.runInEDTAndWaitWithException(new Runnable() {
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161 | @Override
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162 | public void run() {
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163 | realAddLayer(layer);
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164 | }
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165 | });
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166 | }
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167 |
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168 | protected synchronized void realAddLayer(Layer layer) {
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169 | if (containsLayer(layer)) {
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170 | throw new IllegalArgumentException("Cannot add a layer twice.");
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171 | }
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172 | LayerPositionStrategy positionStrategy = layer.getDefaultLayerPosition();
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173 | int position = positionStrategy.getPosition(this);
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174 | checkPosition(position);
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175 | insertLayerAt(layer, position);
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176 | fireLayerAdded(layer);
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177 | layer.hookUpMapView(); // needs to be after fireLayerAdded
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178 | }
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179 |
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180 | /**
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181 | * Remove the layer from the mapview. If the layer was in the list before,
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182 | * an LayerChange event is fired.
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183 | * @param layer The layer to remove
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184 | */
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185 | public void removeLayer(final Layer layer) {
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186 | // we force this on to the EDT Thread to make events fire from there.
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187 | // The synchronization lock needs to be held by the EDT.
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188 | GuiHelper.runInEDTAndWaitWithException(new Runnable() {
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189 | @Override
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190 | public void run() {
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191 | realRemoveLayer(layer);
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192 | }
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193 | });
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194 | }
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195 |
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196 | protected synchronized void realRemoveLayer(Layer layer) {
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197 | checkContainsLayer(layer);
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198 |
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199 | fireLayerRemoving(layer);
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200 | layers.remove(layer);
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201 | }
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202 |
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203 | /**
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204 | * Move a layer to a new position.
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205 | * @param layer The layer to move.
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206 | * @param position The position.
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207 | * @throws IndexOutOfBoundsException if the position is out of bounds.
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208 | */
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209 | public void moveLayer(final Layer layer, final int position) {
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210 | // we force this on to the EDT Thread to make events fire from there.
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211 | // The synchronization lock needs to be held by the EDT.
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212 | GuiHelper.runInEDTAndWaitWithException(new Runnable() {
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213 | @Override
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214 | public void run() {
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215 | realMoveLayer(layer, position);
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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 | protected synchronized void realMoveLayer(Layer layer, int position) {
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221 | checkContainsLayer(layer);
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222 | checkPosition(position);
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223 |
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224 | int curLayerPos = layers.indexOf(layer);
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225 | if (position == curLayerPos)
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226 | return; // already in place.
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227 | layers.remove(curLayerPos);
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228 | insertLayerAt(layer, position);
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229 | fireLayerOrderChanged();
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230 | }
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231 |
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232 | /**
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233 | * Insert a layer at a given position.
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234 | * @param layer The layer to add.
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235 | * @param position The position on which we should add it.
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236 | */
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237 | private void insertLayerAt(Layer layer, int position) {
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238 | if (position == layers.size()) {
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239 | layers.add(layer);
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240 | } else {
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241 | layers.add(position, layer);
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242 | }
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243 | }
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244 |
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245 | /**
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246 | * Check if the (new) position is valid
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247 | * @param position The position index
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248 | * @throws IndexOutOfBoundsException if it is not.
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249 | */
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250 | private void checkPosition(int position) {
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251 | if (position < 0 || position > layers.size()) {
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252 | throw new IndexOutOfBoundsException("Position " + position + " out of range.");
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253 | }
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254 | }
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255 |
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256 | /**
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257 | * Gets an unmodifiable list of all layers that are currently in this manager. This list won't update once layers are added or removed.
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258 | * @return The list of layers.
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259 | */
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260 | public List<Layer> getLayers() {
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261 | return Collections.unmodifiableList(new ArrayList<>(layers));
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262 | }
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263 |
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264 | /**
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265 | * Replies an unmodifiable list of layers of a certain type.
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266 | *
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267 | * Example:
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268 | * <pre>
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269 | * List<WMSLayer> wmsLayers = getLayersOfType(WMSLayer.class);
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270 | * </pre>
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271 | * @param <T> The layer type
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272 | * @param ofType The layer type.
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273 | * @return an unmodifiable list of layers of a certain type.
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274 | */
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275 | public <T extends Layer> List<T> getLayersOfType(Class<T> ofType) {
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276 | return new ArrayList<>(Utils.filteredCollection(getLayers(), ofType));
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277 | }
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278 |
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279 | /**
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280 | * replies true if the list of layers managed by this map view contain layer
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281 | *
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282 | * @param layer the layer
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283 | * @return true if the list of layers managed by this map view contain layer
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284 | */
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285 | public synchronized boolean containsLayer(Layer layer) {
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286 | return layers.contains(layer);
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287 | }
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288 |
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289 | protected void checkContainsLayer(Layer layer) {
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290 | if (!containsLayer(layer)) {
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291 | throw new IllegalArgumentException(layer + " is not managed by us.");
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292 | }
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293 | }
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294 |
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295 | /**
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296 | * Adds a layer change listener
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297 | *
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298 | * @param listener the listener.
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299 | * @throws IllegalArgumentException If the listener was added twice.
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300 | */
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301 | public synchronized void addLayerChangeListener(LayerChangeListener listener) {
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302 | addLayerChangeListener(listener, false);
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303 | }
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304 |
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305 | /**
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306 | * Adds a layer change listener
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307 | *
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308 | * @param listener the listener.
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309 | * @param fireAdd if we should fire an add event for every layer in this manager.
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310 | * @throws IllegalArgumentException If the listener was added twice.
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311 | */
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312 | public synchronized void addLayerChangeListener(LayerChangeListener listener, boolean fireAdd) {
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313 | if (layerChangeListeners.contains(listener)) {
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314 | throw new IllegalArgumentException("Listener already registered.");
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315 | }
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316 | layerChangeListeners.add(listener);
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317 | if (fireAdd) {
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318 | for (Layer l : getLayers()) {
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319 | listener.layerAdded(new LayerAddEvent(this, l));
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320 | }
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321 | }
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322 | }
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323 |
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324 | /**
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325 | * Removes a layer change listener
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326 | *
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327 | * @param listener the listener. Ignored if null or already registered.
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328 | */
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329 | public synchronized void removeLayerChangeListener(LayerChangeListener listener) {
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330 | removeLayerChangeListener(listener, false);
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331 | }
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332 |
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333 |
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334 | /**
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335 | * Removes a layer change listener
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336 | *
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337 | * @param listener the listener.
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338 | * @param fireRemove if we should fire a remove event for every layer in this manager.
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339 | */
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340 | public synchronized void removeLayerChangeListener(LayerChangeListener listener, boolean fireRemove) {
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341 | if (!layerChangeListeners.remove(listener)) {
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342 | throw new IllegalArgumentException("Listener was not registered before: " + listener);
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343 | } else {
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344 | if (fireRemove) {
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345 | for (Layer l : getLayers()) {
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346 | listener.layerRemoving(new LayerRemoveEvent(this, l));
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347 | }
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348 | }
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349 | }
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350 | }
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351 |
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352 | private void fireLayerAdded(Layer layer) {
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353 | GuiHelper.assertCallFromEdt();
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354 | LayerAddEvent e = new LayerAddEvent(this, layer);
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355 | for (LayerChangeListener l : layerChangeListeners) {
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356 | try {
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357 | l.layerAdded(e);
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358 | } catch (RuntimeException t) {
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359 | throw BugReport.intercept(t).put("listener", l).put("event", e);
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360 | }
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361 | }
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362 | }
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363 |
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364 | private void fireLayerRemoving(Layer layer) {
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365 | GuiHelper.assertCallFromEdt();
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366 | LayerRemoveEvent e = new LayerRemoveEvent(this, layer);
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367 | for (LayerChangeListener l : layerChangeListeners) {
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368 | try {
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369 | l.layerRemoving(e);
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370 | } catch (RuntimeException t) {
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371 | throw BugReport.intercept(t).put("listener", l).put("event", e);
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372 | }
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373 | }
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374 | }
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375 |
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376 | private void fireLayerOrderChanged() {
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377 | GuiHelper.assertCallFromEdt();
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378 | LayerOrderChangeEvent e = new LayerOrderChangeEvent(this);
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379 | for (LayerChangeListener l : layerChangeListeners) {
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380 | try {
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381 | l.layerOrderChanged(e);
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382 | } catch (RuntimeException t) {
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383 | throw BugReport.intercept(t).put("listener", l).put("event", e);
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384 | }
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385 | }
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386 | }
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387 |
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388 | /**
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389 | * Reset all layer manager state. This includes removing all layers and then unregistering all listeners
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390 | * @since 10432
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391 | */
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392 | public void resetState() {
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393 | // some layer remove listeners remove other layers.
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394 | while (!getLayers().isEmpty()) {
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395 | removeLayer(getLayers().get(0));
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396 | }
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397 |
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398 | layerChangeListeners.clear();
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399 | }
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400 | }
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