[10605] | 1 | // License: GPL. For details, see LICENSE file.
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| 2 | package org.openstreetmap.josm.gui.dialogs.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.datatransfer.Transferable;
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| 7 | import java.awt.datatransfer.UnsupportedFlavorException;
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| 8 | import java.io.IOException;
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| 9 | import java.util.ArrayList;
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| 10 | import java.util.Collection;
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| 11 | import java.util.List;
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| 12 |
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| 13 | import javax.swing.JComponent;
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| 14 | import javax.swing.JTable;
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| 15 | import javax.swing.TransferHandler;
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| 16 |
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| 17 | import org.openstreetmap.josm.Main;
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| 18 | import org.openstreetmap.josm.data.osm.DataSet;
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| 19 | import org.openstreetmap.josm.gui.datatransfer.LayerTransferable;
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| 20 | import org.openstreetmap.josm.gui.dialogs.LayerListDialog.LayerListModel;
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| 21 | import org.openstreetmap.josm.gui.layer.Layer;
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| 22 | import org.openstreetmap.josm.gui.layer.OsmDataLayer;
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| 23 |
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| 24 | /**
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| 25 | * This class allows the user to transfer layers using drag+drop.
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| 26 | * <p>
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| 27 | * It supports copy (duplication) of layers, simple moves and linking layers to a new layer manager.
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| 28 | *
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| 29 | * @author Michael Zangl
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| 30 | * @since 10605
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| 31 | */
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| 32 | public class LayerListTransferHandler extends TransferHandler {
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| 33 | @Override
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| 34 | public int getSourceActions(JComponent c) {
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| 35 | // we know that the source is a layer list, so don't check c.
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| 36 | LayerListModel tableModel = (LayerListModel) ((JTable) c).getModel();
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| 37 | if (tableModel.getSelectedLayers().isEmpty()) {
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| 38 | return 0;
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| 39 | }
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| 40 | int actions = MOVE;
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| 41 | if (onlyDataLayersSelected(tableModel)) {
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| 42 | actions |= COPY;
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| 43 | }
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| 44 | return actions /* soon: | LINK*/;
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| 45 | }
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| 46 |
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| 47 | private static boolean onlyDataLayersSelected(LayerListModel tableModel) {
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| 48 | for (Layer l : tableModel.getSelectedLayers()) {
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| 49 | if (!(l instanceof OsmDataLayer)) {
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| 50 | return false;
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| 51 | }
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| 52 | }
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| 53 | return true;
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| 54 | }
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| 55 |
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| 56 | @Override
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| 57 | protected Transferable createTransferable(JComponent c) {
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| 58 | LayerListModel tableModel = (LayerListModel) ((JTable) c).getModel();
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| 59 | return new LayerTransferable(tableModel.getLayerManager(), tableModel.getSelectedLayers());
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| 60 | }
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| 61 |
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| 62 | @Override
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| 63 | public boolean canImport(TransferSupport support) {
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| 64 | if (support.isDrop()) {
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| 65 | support.setShowDropLocation(true);
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| 66 | }
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| 67 |
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| 68 | if (!support.isDataFlavorSupported(LayerTransferable.LAYER_DATA)) {
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| 69 | return false;
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| 70 | }
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| 71 |
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| 72 | if (support.getDropAction() == LINK) {
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| 73 | // cannot link yet.
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| 74 | return false;
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| 75 | }
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| 76 |
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| 77 | return true;
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| 78 | }
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| 79 |
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| 80 | @Override
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| 81 | public boolean importData(TransferSupport support) {
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| 82 | try {
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| 83 | LayerListModel tableModel = (LayerListModel) ((JTable) support.getComponent()).getModel();
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| 84 |
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[10762] | 85 | LayerTransferable.Data layers = (LayerTransferable.Data) support.getTransferable()
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| 86 | .getTransferData(LayerTransferable.LAYER_DATA);
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[10605] | 87 |
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| 88 | int dropLocation;
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| 89 | if (support.isDrop()) {
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| 90 | JTable.DropLocation dl = (JTable.DropLocation) support.getDropLocation();
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| 91 | dropLocation = dl.getRow();
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| 92 | } else {
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| 93 | dropLocation = layers.getLayers().get(0).getDefaultLayerPosition().getPosition(layers.getManager());
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| 94 | }
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| 95 |
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| 96 | boolean isSameLayerManager = tableModel.getLayerManager() == layers.getManager();
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| 97 |
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[11452] | 98 | if (isSameLayerManager && support.getDropAction() == MOVE) {
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[10605] | 99 | for (Layer layer : layers.getLayers()) {
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| 100 | boolean wasBeforeInsert = layers.getManager().getLayers().indexOf(layer) <= dropLocation;
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| 101 | if (wasBeforeInsert) {
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| 102 | // need to move insertion point one down to preserve order
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| 103 | dropLocation--;
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| 104 | }
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| 105 | layers.getManager().moveLayer(layer, dropLocation);
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| 106 | dropLocation++;
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| 107 | }
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| 108 | } else {
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| 109 | List<Layer> layersToUse = layers.getLayers();
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| 110 | if (support.getDropAction() == COPY) {
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| 111 | layersToUse = createCopy(layersToUse, layers.getManager().getLayers());
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| 112 | }
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| 113 | for (Layer layer : layersToUse) {
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| 114 | layers.getManager().addLayer(layer);
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| 115 | layers.getManager().moveLayer(layer, dropLocation);
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| 116 | dropLocation++;
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| 117 | }
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| 118 | }
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| 119 |
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| 120 | return true;
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| 121 | } catch (UnsupportedFlavorException e) {
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| 122 | Main.warn("Flavor not supported", e);
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| 123 | return false;
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| 124 | } catch (IOException e) {
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| 125 | Main.warn("Error while pasting layer", e);
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| 126 | return false;
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| 127 | }
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| 128 | }
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| 129 |
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| 130 | private static List<Layer> createCopy(List<Layer> layersToUse, List<Layer> namesToAvoid) {
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| 131 | Collection<String> layerNames = getNames(namesToAvoid);
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| 132 | ArrayList<Layer> layers = new ArrayList<>();
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| 133 | for (Layer layer : layersToUse) {
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| 134 | if (layer instanceof OsmDataLayer) {
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| 135 | String newName = suggestNewLayerName(layer.getName(), layerNames);
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| 136 | OsmDataLayer newLayer = new OsmDataLayer(new DataSet(((OsmDataLayer) layer).data), newName, null);
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| 137 | layers.add(newLayer);
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| 138 | layerNames.add(newName);
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| 139 | }
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| 140 | }
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| 141 | return layers;
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| 142 | }
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| 143 |
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| 144 | /**
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| 145 | * Suggests a new name in the form "copy of name"
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| 146 | * @param name The base name
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[10606] | 147 | * @param namesToAvoid The list of layers to use to avoid duplicate names.
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[10605] | 148 | * @return The new name
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| 149 | */
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| 150 | public static String suggestNewLayerName(String name, List<Layer> namesToAvoid) {
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| 151 | Collection<String> layerNames = getNames(namesToAvoid);
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| 152 |
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| 153 | return suggestNewLayerName(name, layerNames);
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| 154 | }
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| 155 |
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| 156 | private static List<String> getNames(List<Layer> namesToAvoid) {
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| 157 | List<String> layerNames = new ArrayList<>();
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| 158 | for (Layer l: namesToAvoid) {
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| 159 | layerNames.add(l.getName());
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| 160 | }
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| 161 | return layerNames;
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| 162 | }
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| 163 |
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| 164 | private static String suggestNewLayerName(String name, Collection<String> layerNames) {
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| 165 | // Translators: "Copy of {layer name}"
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| 166 | String newName = tr("Copy of {0}", name);
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| 167 | int i = 2;
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| 168 | while (layerNames.contains(newName)) {
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| 169 | // Translators: "Copy {number} of {layer name}"
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| 170 | newName = tr("Copy {1} of {0}", name, i);
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| 171 | i++;
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| 172 | }
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| 173 | return newName;
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| 174 | }
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| 175 | }
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