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.gui.layer.Layer;
014import org.openstreetmap.josm.gui.layer.Layer.LayerAction;
015import org.openstreetmap.josm.tools.ImageProvider;
016
017/**
018 * Toggle the image display between thumbnails and symbols.
019 * @since 7935
020 */
021public class ShowThumbnailAction extends AbstractAction implements LayerAction {
022
023    private final transient GeoImageLayer layer;
024
025    /**
026     * Constructs a new {@code ToggleGeoImageThumbAction} action.
027     * @param layer image layer
028     */
029    public ShowThumbnailAction(GeoImageLayer layer) {
030        super(tr("Show thumbnails"));
031        new ImageProvider("dialogs/geoimage/togglegit").getResource().attachImageIcon(this, true);
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 e action event
039     */
040    @Override
041    public void actionPerformed(ActionEvent e) {
042        layer.setUseThumbs(!layer.isUseThumbs());
043    }
044
045    /**
046     * Check if there is any suitable image to be toggled.
047     * @param layer image layer
048     * @return {@code true} if there are images to be toggled,
049     *         {@code false} otherwise
050     */
051    private static boolean enabled(GeoImageLayer layer) {
052        return !layer.getImageData().getImages().isEmpty();
053    }
054
055    /** Create actual menu entry and define if it is enabled or not. */
056    @Override
057    public Component createMenuComponent() {
058        JCheckBoxMenuItem toggleItem = new JCheckBoxMenuItem(this);
059        toggleItem.setEnabled(enabled(layer));
060        toggleItem.setState(layer.isUseThumbs());
061        return toggleItem;
062    }
063
064    /** Check if the current layer is supported. */
065    @Override
066    public boolean supportLayers(List<Layer> layers) {
067        return layers.size() == 1 && layers.get(0) instanceof GeoImageLayer;
068    }
069}