001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.gui.layer.geoimage;
003
004import static org.openstreetmap.josm.tools.I18n.tr;
005
006import java.awt.Component;
007import java.awt.event.ActionEvent;
008import java.util.List;
009
010import javax.swing.AbstractAction;
011import javax.swing.JCheckBoxMenuItem;
012
013import org.openstreetmap.josm.Main;
014import org.openstreetmap.josm.gui.layer.Layer;
015import org.openstreetmap.josm.gui.layer.Layer.LayerAction;
016import org.openstreetmap.josm.tools.ImageProvider;
017
018/**
019 * Toggle the image display between thumbnails and symbols.
020 * @since 7935
021 */
022public class ShowThumbnailAction extends AbstractAction implements LayerAction {
023
024    private final transient GeoImageLayer layer;
025
026    /**
027     * Constructs a new {@code ToggleGeoImageThumbAction} action.
028     * @param layer image layer
029     */
030    public ShowThumbnailAction(GeoImageLayer layer) {
031        super(tr("Show thumbnails"), ImageProvider.get("dialogs/geoimage/togglegit"));
032        putValue(SHORT_DESCRIPTION, tr("Show image thumbnails instead of icons."));
033        this.layer = layer;
034    }
035
036    /**
037     * This is called after the menu entry was selected.
038     * @param arg0 action event
039     */
040    @Override
041    public void actionPerformed(ActionEvent arg0) {
042        layer.setUseThumbs(!layer.isUseThumbs());
043        Main.map.mapView.repaint();
044    }
045
046    /**
047     * Check if there is any suitable image to be toggled.
048     * @param layer image layer
049     * @return {@code true} if there are images to be toggled,
050     *         {@code false} otherwise
051     */
052    private static boolean enabled(GeoImageLayer layer) {
053        return layer.data != null && !layer.data.isEmpty();
054    }
055
056    /** Create actual menu entry and define if it is enabled or not. */
057    @Override
058    public Component createMenuComponent() {
059        JCheckBoxMenuItem toggleItem = new JCheckBoxMenuItem(this);
060        toggleItem.setEnabled(enabled(layer));
061        toggleItem.setState(layer.isUseThumbs());
062        return toggleItem;
063    }
064
065    /** Check if the current layer is supported. */
066    @Override
067    public boolean supportLayers(List<Layer> layers) {
068        return layers.size() == 1 && layers.get(0) instanceof GeoImageLayer;
069    }
070}