// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.gui.dialogs.layer;
import static org.openstreetmap.josm.tools.I18n.tr;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import javax.swing.JComponent;
import javax.swing.JTable;
import javax.swing.TransferHandler;
import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.osm.DataSet;
import org.openstreetmap.josm.gui.datatransfer.LayerTransferable;
import org.openstreetmap.josm.gui.dialogs.LayerListDialog.LayerListModel;
import org.openstreetmap.josm.gui.layer.Layer;
import org.openstreetmap.josm.gui.layer.OsmDataLayer;
/**
* This class allows the user to transfer layers using drag+drop.
* <p>
* It supports copy (duplication) of layers, simple moves and linking layers to a new layer manager.
*
* @author Michael Zangl
* @since 10605
*/
public class LayerListTransferHandler extends TransferHandler {
@Override
public int getSourceActions(JComponent c) {
if (c instanceof JTable) {
LayerListModel tableModel = (LayerListModel) ((JTable) c).getModel();
if (!tableModel.getSelectedLayers().isEmpty()) {
int actions = MOVE;
if (onlyDataLayersSelected(tableModel)) {
actions |= COPY;
}
return actions /* soon: | LINK*/;
}
}
return NONE;
}
private static boolean onlyDataLayersSelected(LayerListModel tableModel) {
for (Layer l : tableModel.getSelectedLayers()) {
if (!(l instanceof OsmDataLayer)) {
return false;
}
}
return true;
}
@Override
protected Transferable createTransferable(JComponent c) {
if (c instanceof JTable) {
LayerListModel tableModel = (LayerListModel) ((JTable) c).getModel();
return new LayerTransferable(tableModel.getLayerManager(), tableModel.getSelectedLayers());
}
return null;
}
@Override
public boolean canImport(TransferSupport support) {
if (support.isDrop()) {
support.setShowDropLocation(true);
}
if (!support.isDataFlavorSupported(LayerTransferable.LAYER_DATA)) {
return false;
}
if (support.getDropAction() == LINK) {
// cannot link yet.
return false;
}
return true;
}
@Override
public boolean importData(TransferSupport support) {
try {
LayerListModel tableModel = (LayerListModel) ((JTable) support.getComponent()).getModel();
LayerTransferable.Data layers = (LayerTransferable.Data) support.getTransferable()
.getTransferData(LayerTransferable.LAYER_DATA);
int dropLocation;
if (support.isDrop()) {
DropLocation dl = support.getDropLocation();
if (dl instanceof JTable.DropLocation) {
dropLocation = ((JTable.DropLocation) dl).getRow();
} else {
dropLocation = 0;
}
} else {
dropLocation = layers.getLayers().get(0).getDefaultLayerPosition().getPosition(layers.getManager());
}
boolean isSameLayerManager = tableModel.getLayerManager() == layers.getManager();
if (isSameLayerManager && support.getDropAction() == MOVE) {
for (Layer layer : layers.getLayers()) {
boolean wasBeforeInsert = layers.getManager().getLayers().indexOf(layer) <= dropLocation;
if (wasBeforeInsert) {
// need to move insertion point one down to preserve order
dropLocation--;
}
layers.getManager().moveLayer(layer, dropLocation);
dropLocation++;
}
} else {
List<Layer> layersToUse = layers.getLayers();
if (support.getDropAction() == COPY) {
layersToUse = createCopy(layersToUse, layers.getManager().getLayers());
}
for (Layer layer : layersToUse) {
layers.getManager().addLayer(layer);
layers.getManager().moveLayer(layer, dropLocation);
dropLocation++;
}
}
return true;
} catch (UnsupportedFlavorException e) {
Main.warn("Flavor not supported", e);
return false;
} catch (IOException e) {
Main.warn("Error while pasting layer", e);
return false;
}
}
private static List<Layer> createCopy(List<Layer> layersToUse, List<Layer> namesToAvoid) {
Collection<String> layerNames = getNames(namesToAvoid);
ArrayList<Layer> layers = new ArrayList<>();
for (Layer layer : layersToUse) {
if (layer instanceof OsmDataLayer) {
String newName = suggestNewLayerName(layer.getName(), layerNames);
OsmDataLayer newLayer = new OsmDataLayer(new DataSet(((OsmDataLayer) layer).data), newName, null);
layers.add(newLayer);
layerNames.add(newName);
}
}
return layers;
}
/**
* Suggests a new name in the form "copy of name"
* @param name The base name
* @param namesToAvoid The list of layers to use to avoid duplicate names.
* @return The new name
*/
public static String suggestNewLayerName(String name, List<Layer> namesToAvoid) {
Collection<String> layerNames = getNames(namesToAvoid);
return suggestNewLayerName(name, layerNames);
}
private static List<String> getNames(List<Layer> namesToAvoid) {
List<String> layerNames = new ArrayList<>();
for (Layer l: namesToAvoid) {
layerNames.add(l.getName());
}
return layerNames;
}
private static String suggestNewLayerName(String name, Collection<String> layerNames) {
// Translators: "Copy of {layer name}"
String newName = tr("Copy of {0}", name);
int i = 2;
while (layerNames.contains(newName)) {
// Translators: "Copy {number} of {layer name}"
newName = tr("Copy {1} of {0}", name, i);
i++;
}
return newName;
}
}