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 static org.openstreetmap.josm.tools.I18n.tr;
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5 |
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6 | import java.awt.GraphicsEnvironment;
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7 | import java.util.ArrayList;
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8 | import java.util.Collection;
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9 | import java.util.List;
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10 | import java.util.ListIterator;
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11 | import java.util.concurrent.CopyOnWriteArrayList;
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12 |
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13 | import javax.swing.JOptionPane;
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14 |
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15 | import org.openstreetmap.josm.data.osm.DataSet;
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16 | import org.openstreetmap.josm.gui.MainApplication;
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17 | import org.openstreetmap.josm.gui.io.AsynchronousUploadPrimitivesTask;
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18 | import org.openstreetmap.josm.gui.util.GuiHelper;
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19 | import org.openstreetmap.josm.tools.Logging;
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20 |
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21 | /**
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22 | * This class extends the layer manager by adding an active and an edit layer.
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23 | * <p>
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24 | * The active layer is the layer the user is currently working on.
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25 | * <p>
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26 | * The edit layer is an data layer that we currently work with.
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27 | * @author Michael Zangl
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28 | * @since 10279
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29 | */
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30 | public class MainLayerManager extends LayerManager {
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31 | /**
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32 | * This listener listens to changes of the active or the edit layer.
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33 | * @author Michael Zangl
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34 | * @since 10600 (functional interface)
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35 | */
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36 | @FunctionalInterface
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37 | public interface ActiveLayerChangeListener {
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38 | /**
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39 | * Called whenever the active or edit layer changed.
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40 | * <p>
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41 | * You can be sure that this layer is still contained in this set.
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42 | * <p>
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43 | * Listeners are called in the EDT thread and you can manipulate the layer manager in the current thread.
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44 | * @param e The change event.
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45 | */
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46 | void activeOrEditLayerChanged(ActiveLayerChangeEvent e);
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47 | }
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48 |
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49 | /**
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50 | * This event is fired whenever the active or the data layer changes.
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51 | * @author Michael Zangl
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52 | */
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53 | public static class ActiveLayerChangeEvent extends LayerManagerEvent {
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54 |
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55 | private final OsmDataLayer previousDataLayer;
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56 |
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57 | private final Layer previousActiveLayer;
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58 |
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59 | /**
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60 | * Create a new {@link ActiveLayerChangeEvent}
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61 | * @param source The source
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62 | * @param previousDataLayer the previous data layer
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63 | * @param previousActiveLayer the previous active layer
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64 | */
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65 | ActiveLayerChangeEvent(MainLayerManager source, OsmDataLayer previousDataLayer,
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66 | Layer previousActiveLayer) {
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67 | super(source);
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68 | this.previousDataLayer = previousDataLayer;
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69 | this.previousActiveLayer = previousActiveLayer;
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70 | }
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71 |
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72 | /**
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73 | * Gets the data layer that was previously used.
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74 | * @return The old data layer, <code>null</code> if there is none.
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75 | * @deprecated use {@link #getPreviousDataLayer}
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76 | */
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77 | @Deprecated
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78 | public OsmDataLayer getPreviousEditLayer() {
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79 | return getPreviousDataLayer();
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80 | }
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81 |
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82 | /**
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83 | * Gets the data layer that was previously used.
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84 | * @return The old data layer, <code>null</code> if there is none.
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85 | * @since 13434
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86 | */
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87 | public OsmDataLayer getPreviousDataLayer() {
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88 | return previousDataLayer;
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89 | }
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90 |
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91 | /**
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92 | * Gets the active layer that was previously used.
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93 | * @return The old active layer, <code>null</code> if there is none.
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94 | */
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95 | public Layer getPreviousActiveLayer() {
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96 | return previousActiveLayer;
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97 | }
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98 |
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99 | /**
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100 | * Gets the data set that was previously used.
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101 | * @return The data set of {@link #getPreviousDataLayer()}.
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102 | * @deprecated use {@link #getPreviousDataSet}
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103 | */
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104 | @Deprecated
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105 | public DataSet getPreviousEditDataSet() {
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106 | return getPreviousDataSet();
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107 | }
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108 |
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109 | /**
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110 | * Gets the data set that was previously used.
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111 | * @return The data set of {@link #getPreviousDataLayer()}.
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112 | * @since 13434
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113 | */
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114 | public DataSet getPreviousDataSet() {
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115 | if (previousDataLayer != null) {
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116 | return previousDataLayer.data;
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117 | } else {
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118 | return null;
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119 | }
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120 | }
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121 |
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122 | @Override
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123 | public MainLayerManager getSource() {
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124 | return (MainLayerManager) super.getSource();
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125 | }
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126 | }
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127 |
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128 | /**
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129 | * This event is fired for {@link LayerAvailabilityListener}
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130 | * @author Michael Zangl
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131 | * @since 10508
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132 | */
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133 | public static class LayerAvailabilityEvent extends LayerManagerEvent {
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134 | private final boolean hasLayers;
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135 |
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136 | LayerAvailabilityEvent(LayerManager source, boolean hasLayers) {
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137 | super(source);
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138 | this.hasLayers = hasLayers;
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139 | }
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140 |
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141 | /**
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142 | * Checks if this layer manager will have layers afterwards
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143 | * @return true if layers will be added.
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144 | */
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145 | public boolean hasLayers() {
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146 | return hasLayers;
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147 | }
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148 | }
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149 |
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150 | /**
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151 | * A listener that gets informed before any layer is displayed and after all layers are removed.
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152 | * @author Michael Zangl
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153 | * @since 10508
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154 | */
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155 | public interface LayerAvailabilityListener {
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156 | /**
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157 | * This method is called in the UI thread right before the first layer is added.
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158 | * @param e The event.
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159 | */
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160 | void beforeFirstLayerAdded(LayerAvailabilityEvent e);
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161 |
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162 | /**
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163 | * This method is called in the UI thread after the last layer was removed.
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164 | * @param e The event.
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165 | */
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166 | void afterLastLayerRemoved(LayerAvailabilityEvent e);
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167 | }
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168 |
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169 | /**
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170 | * The layer from the layers list that is currently active.
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171 | */
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172 | private Layer activeLayer;
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173 |
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174 | /**
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175 | * The current active data layer. It might be editable or not, based on its read-only status.
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176 | */
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177 | private OsmDataLayer dataLayer;
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178 |
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179 | private final List<ActiveLayerChangeListener> activeLayerChangeListeners = new CopyOnWriteArrayList<>();
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180 | private final List<LayerAvailabilityListener> layerAvailabilityListeners = new CopyOnWriteArrayList<>();
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181 |
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182 | /**
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183 | * Adds a active/edit layer change listener
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184 | *
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185 | * @param listener the listener.
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186 | */
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187 | public synchronized void addActiveLayerChangeListener(ActiveLayerChangeListener listener) {
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188 | if (activeLayerChangeListeners.contains(listener)) {
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189 | throw new IllegalArgumentException("Attempted to add listener that was already in list: " + listener);
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190 | }
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191 | activeLayerChangeListeners.add(listener);
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192 | }
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193 |
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194 | /**
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195 | * Adds a active/edit layer change listener. Fire a fake active-layer-changed-event right after adding
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196 | * the listener. The previous layers will be null. The listener is notified in the current thread.
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197 | * @param listener the listener.
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198 | */
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199 | public synchronized void addAndFireActiveLayerChangeListener(ActiveLayerChangeListener listener) {
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200 | addActiveLayerChangeListener(listener);
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201 | listener.activeOrEditLayerChanged(new ActiveLayerChangeEvent(this, null, null));
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202 | }
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203 |
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204 | /**
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205 | * Removes an active/edit layer change listener.
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206 | * @param listener the listener.
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207 | */
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208 | public synchronized void removeActiveLayerChangeListener(ActiveLayerChangeListener listener) {
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209 | if (!activeLayerChangeListeners.contains(listener)) {
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210 | throw new IllegalArgumentException("Attempted to remove listener that was not in list: " + listener);
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211 | }
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212 | activeLayerChangeListeners.remove(listener);
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213 | }
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214 |
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215 | /**
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216 | * Add a new {@link LayerAvailabilityListener}.
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217 | * @param listener The listener
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218 | * @since 10508
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219 | */
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220 | public synchronized void addLayerAvailabilityListener(LayerAvailabilityListener listener) {
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221 | if (!layerAvailabilityListeners.add(listener)) {
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222 | throw new IllegalArgumentException("Attempted to add listener that was already in list: " + listener);
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223 | }
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224 | }
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225 |
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226 | /**
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227 | * Remove an {@link LayerAvailabilityListener}.
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228 | * @param listener The listener
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229 | * @since 10508
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230 | */
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231 | public synchronized void removeLayerAvailabilityListener(LayerAvailabilityListener listener) {
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232 | if (!layerAvailabilityListeners.remove(listener)) {
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233 | throw new IllegalArgumentException("Attempted to remove listener that was not in list: " + listener);
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234 | }
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235 | }
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236 |
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237 | /**
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238 | * Set the active layer, unless the layer is being uploaded.
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239 | * If the layer is an OsmDataLayer, the edit layer is also changed.
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240 | * @param layer The active layer.
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241 | */
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242 | public void setActiveLayer(final Layer layer) {
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243 | // we force this on to the EDT Thread to make events fire from there.
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244 | // The synchronization lock needs to be held by the EDT.
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245 | if (layer instanceof OsmDataLayer && ((OsmDataLayer) layer).isUploadInProgress()) {
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246 | GuiHelper.runInEDT(() ->
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247 | JOptionPane.showMessageDialog(
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248 | MainApplication.parent,
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249 | tr("Trying to set a read only data layer as edit layer"),
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250 | tr("Warning"),
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251 | JOptionPane.WARNING_MESSAGE));
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252 | } else {
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253 | GuiHelper.runInEDTAndWaitWithException(() -> realSetActiveLayer(layer));
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254 | }
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255 | }
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256 |
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257 | protected synchronized void realSetActiveLayer(final Layer layer) {
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258 | // to be called in EDT thread
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259 | checkContainsLayer(layer);
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260 | setActiveLayer(layer, false);
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261 | }
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262 |
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263 | private void setActiveLayer(Layer layer, boolean forceEditLayerUpdate) {
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264 | ActiveLayerChangeEvent event = new ActiveLayerChangeEvent(this, dataLayer, activeLayer);
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265 | activeLayer = layer;
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266 | if (activeLayer instanceof OsmDataLayer) {
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267 | dataLayer = (OsmDataLayer) activeLayer;
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268 | } else if (forceEditLayerUpdate) {
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269 | dataLayer = null;
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270 | }
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271 | fireActiveLayerChange(event);
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272 | }
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273 |
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274 | private void fireActiveLayerChange(ActiveLayerChangeEvent event) {
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275 | GuiHelper.assertCallFromEdt();
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276 | if (event.getPreviousActiveLayer() != activeLayer || event.getPreviousDataLayer() != dataLayer) {
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277 | for (ActiveLayerChangeListener l : activeLayerChangeListeners) {
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278 | l.activeOrEditLayerChanged(event);
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279 | }
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280 | }
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281 | }
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282 |
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283 | @Override
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284 | protected synchronized void realAddLayer(Layer layer, boolean initialZoom) {
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285 | if (getLayers().isEmpty()) {
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286 | LayerAvailabilityEvent e = new LayerAvailabilityEvent(this, true);
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287 | for (LayerAvailabilityListener l : layerAvailabilityListeners) {
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288 | l.beforeFirstLayerAdded(e);
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289 | }
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290 | }
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291 | super.realAddLayer(layer, initialZoom);
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292 |
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293 | // update the active layer automatically.
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294 | if (layer instanceof OsmDataLayer || activeLayer == null) {
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295 | setActiveLayer(layer);
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296 | }
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297 | }
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298 |
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299 | @Override
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300 | protected Collection<Layer> realRemoveSingleLayer(Layer layer) {
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301 | if ((layer instanceof OsmDataLayer) && (((OsmDataLayer) layer).isUploadInProgress())) {
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302 | GuiHelper.runInEDT(() -> JOptionPane.showMessageDialog(MainApplication.parent,
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303 | tr("Trying to delete the layer with background upload. Please wait until the upload is finished.")));
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304 |
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305 | // Return an empty collection for allowing to delete other layers
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306 | return new ArrayList<>();
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307 | }
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308 |
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309 | if (layer == activeLayer || layer == dataLayer) {
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310 | Layer nextActive = suggestNextActiveLayer(layer);
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311 | setActiveLayer(nextActive, true);
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312 | }
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313 |
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314 | Collection<Layer> toDelete = super.realRemoveSingleLayer(layer);
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315 | if (getLayers().isEmpty()) {
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316 | LayerAvailabilityEvent e = new LayerAvailabilityEvent(this, false);
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317 | for (LayerAvailabilityListener l : layerAvailabilityListeners) {
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318 | l.afterLastLayerRemoved(e);
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319 | }
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320 | }
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321 | return toDelete;
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322 | }
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323 |
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324 | /**
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325 | * Determines the next active data layer according to the following
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326 | * rules:
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327 | * <ul>
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328 | * <li>if there is at least one {@link OsmDataLayer} the first one
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329 | * becomes active</li>
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330 | * <li>otherwise, the top most layer of any type becomes active</li>
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331 | * </ul>
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332 | *
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333 | * @param except A layer to ignore.
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334 | * @return the next active data layer
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335 | */
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336 | private Layer suggestNextActiveLayer(Layer except) {
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337 | List<Layer> layersList = new ArrayList<>(getLayers());
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338 | layersList.remove(except);
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339 | // First look for data layer
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340 | for (Layer layer : layersList) {
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341 | if (layer instanceof OsmDataLayer) {
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342 | return layer;
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343 | }
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344 | }
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345 |
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346 | // Then any layer
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347 | if (!layersList.isEmpty())
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348 | return layersList.get(0);
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349 |
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350 | // and then give up
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351 | return null;
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352 | }
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353 |
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354 | /**
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355 | * Replies the currently active layer
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356 | *
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357 | * @return the currently active layer (may be null)
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358 | */
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359 | public synchronized Layer getActiveLayer() {
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360 | if (activeLayer instanceof OsmDataLayer) {
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361 | if (!((OsmDataLayer) activeLayer).isUploadInProgress()) {
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362 | return activeLayer;
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363 | } else {
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364 | return null;
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365 | }
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366 | } else {
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367 | return activeLayer;
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368 | }
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369 | }
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370 |
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371 | /**
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372 | * Replies the current edit layer, if present and not readOnly
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373 | *
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374 | * @return the current edit layer. May be null.
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375 | * @see #getActiveDataLayer
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376 | */
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377 | public synchronized OsmDataLayer getEditLayer() {
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378 | if (dataLayer != null && !dataLayer.isReadOnly())
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379 | return dataLayer;
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380 | else
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381 | return null;
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382 | }
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383 |
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384 | /**
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385 | * Replies the active data layer. The layer can be read-only.
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386 | *
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387 | * @return the current data layer. May be null or read-only.
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388 | * @see #getEditLayer
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389 | * @since 13434
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390 | */
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391 | public synchronized OsmDataLayer getActiveDataLayer() {
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392 | if (dataLayer != null)
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393 | return dataLayer;
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394 | else
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395 | return null;
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396 | }
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397 |
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398 | /**
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399 | * Gets the data set of the active edit layer, if not readOnly.
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400 | * @return That data set, <code>null</code> if there is no edit layer.
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401 | * @see #getActiveDataSet
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402 | */
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403 | public synchronized DataSet getEditDataSet() {
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404 | if (dataLayer != null && !dataLayer.isReadOnly()) {
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405 | return dataLayer.data;
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406 | } else {
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407 | return null;
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408 | }
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409 | }
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410 |
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411 | /**
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412 | * Gets the data set of the active data layer. The dataset can be read-only.
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413 | * @return That data set, <code>null</code> if there is no active data layer.
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414 | * @see #getEditDataSet
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415 | * @since 13434
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416 | */
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417 | public synchronized DataSet getActiveDataSet() {
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418 | if (dataLayer != null) {
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419 | return dataLayer.data;
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420 | } else {
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421 | return null;
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422 | }
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423 | }
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424 |
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425 | /**
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426 | * Creates a list of the visible layers in Z-Order, the layer with the lowest Z-Order
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427 | * first, layer with the highest Z-Order last.
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428 | * <p>
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429 | * The active data layer is pulled above all adjacent data layers.
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430 | *
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431 | * @return a list of the visible in Z-Order, the layer with the lowest Z-Order
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432 | * first, layer with the highest Z-Order last.
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433 | */
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434 | public synchronized List<Layer> getVisibleLayersInZOrder() {
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435 | List<Layer> ret = new ArrayList<>();
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436 | // This is set while we delay the addition of the active layer.
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437 | boolean activeLayerDelayed = false;
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438 | List<Layer> layers = getLayers();
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439 | for (ListIterator<Layer> iterator = layers.listIterator(layers.size()); iterator.hasPrevious();) {
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440 | Layer l = iterator.previous();
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441 | if (!l.isVisible()) {
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442 | // ignored
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443 | } else if (l == activeLayer && l instanceof OsmDataLayer) {
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444 | // delay and add after the current block of OsmDataLayer
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445 | activeLayerDelayed = true;
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446 | } else {
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447 | if (activeLayerDelayed && !(l instanceof OsmDataLayer)) {
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448 | // add active layer before the current one.
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449 | ret.add(activeLayer);
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450 | activeLayerDelayed = false;
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451 | }
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452 | // Add this layer now
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453 | ret.add(l);
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454 | }
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455 | }
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456 | if (activeLayerDelayed) {
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457 | ret.add(activeLayer);
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458 | }
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459 | return ret;
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460 | }
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461 |
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462 | /**
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463 | * Invalidates current edit layer, if any. Does nothing if there is no edit layer.
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464 | * @since 13150
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465 | */
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466 | public void invalidateEditLayer() {
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467 | if (dataLayer != null) {
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468 | dataLayer.invalidate();
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469 | }
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470 | }
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471 |
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472 | @Override
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473 | protected synchronized void realResetState() {
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474 | // Reset state if no asynchronous upload is under progress
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475 | if (!AsynchronousUploadPrimitivesTask.getCurrentAsynchronousUploadTask().isPresent()) {
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476 | // active and edit layer are unset automatically
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477 | super.realResetState();
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478 |
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479 | activeLayerChangeListeners.clear();
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480 | layerAvailabilityListeners.clear();
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481 | } else {
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482 | String msg = tr("A background upload is already in progress. Cannot reset state until the upload is finished.");
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483 | Logging.warn(msg);
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484 | if (!GraphicsEnvironment.isHeadless()) {
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485 | GuiHelper.runInEDT(() -> JOptionPane.showMessageDialog(MainApplication.parent, msg));
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486 | }
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487 | }
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488 | }
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489 |
|
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490 | /**
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491 | * Prepares an OsmDataLayer for upload. The layer to be uploaded is locked and
|
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492 | * if the layer to be uploaded is the current editLayer then editLayer is reset
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493 | * to null for disallowing any changes to the layer. An ActiveLayerChangeEvent
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494 | * is fired to notify the listeners
|
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495 | *
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496 | * @param layer The OsmDataLayer to be uploaded
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497 | */
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498 | public void prepareLayerForUpload(OsmDataLayer layer) {
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499 | GuiHelper.assertCallFromEdt();
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500 | layer.setUploadInProgress();
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501 | layer.setReadOnly();
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502 |
|
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503 | // Reset only the edit layer as empty
|
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504 | if (dataLayer == layer) {
|
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505 | ActiveLayerChangeEvent activeLayerChangeEvent = new ActiveLayerChangeEvent(this, dataLayer, activeLayer);
|
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506 | dataLayer = null;
|
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507 | fireActiveLayerChange(activeLayerChangeEvent);
|
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508 | }
|
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509 | }
|
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510 |
|
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511 | /**
|
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512 | * Post upload processing of the OsmDataLayer.
|
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513 | * If the current edit layer is empty this function sets the layer uploaded as the
|
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514 | * current editLayer. An ActiveLayerChangeEvent is fired to notify the listeners
|
---|
515 | *
|
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516 | * @param layer The OsmDataLayer uploaded
|
---|
517 | */
|
---|
518 | public void processLayerAfterUpload(OsmDataLayer layer) {
|
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519 | GuiHelper.assertCallFromEdt();
|
---|
520 | layer.unsetReadOnly();
|
---|
521 | layer.unsetUploadInProgress();
|
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522 |
|
---|
523 | // Set the layer as edit layer if the edit layer is empty.
|
---|
524 | if (dataLayer == null) {
|
---|
525 | ActiveLayerChangeEvent layerChangeEvent = new ActiveLayerChangeEvent(this, dataLayer, activeLayer);
|
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526 | dataLayer = layer;
|
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527 | fireActiveLayerChange(layerChangeEvent);
|
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528 | }
|
---|
529 | }
|
---|
530 | }
|
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