source: josm/src/org/openstreetmap/josm/gui/download/DownloadDialog.java@ 295

package org.openstreetmap.josm.gui.download;

import static org.openstreetmap.josm.tools.I18n.tr;

import java.awt.GridBagLayout;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JCheckBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.actions.DownloadAction;
import org.openstreetmap.josm.actions.downloadtasks.DownloadGpsTask;
import org.openstreetmap.josm.actions.downloadtasks.DownloadOsmTask;
import org.openstreetmap.josm.gui.MapView;
import org.openstreetmap.josm.plugins.PluginProxy;
import org.openstreetmap.josm.tools.GBC;

/**
 * Main download dialog.
 * 
 * Can be extended by plugins in two ways:
 * (1) by adding download tasks that are then called with the selected bounding box
 * (2) by adding "DownloadSelection" objects that implement different ways of selecting a bounding box
 * 
 * @author Frederik Ramm <frederik@remote.org>
 *
 */
public class DownloadDialog extends JPanel {
        

        public interface DownloadTask {
                /**
                 * Execute the download.
                 */
                void download(DownloadAction action, double minlat, double minlon, double maxlat, double maxlon);
                /**
                 * @return The checkbox presented to the user
                 */
                JCheckBox getCheckBox();
                /**
                 * @return The name of the preferences suffix to use for storing the
                 * selection state.
                 */
                String getPreferencesSuffix();
        }

        /**
         * The list of download tasks. First entry should be the osm data entry
         * and the second the gps entry. After that, plugins can register additional
         * download possibilities.
         */
        public final List<DownloadTask> downloadTasks = new ArrayList<DownloadTask>(5);

        public final List<DownloadSelection> downloadSelections = new ArrayList<DownloadSelection>();
        public final JTabbedPane tabpane = new JTabbedPane();
        public final JCheckBox newLayer;
        
        public double minlon;
        public double minlat;
        public double maxlon;
        public double maxlat;
        
        
        public DownloadDialog() {
                setLayout(new GridBagLayout());
                
                downloadTasks.add(new DownloadOsmTask());
                downloadTasks.add(new DownloadGpsTask());
                
                // adding the download tasks
                add(new JLabel(tr("Data Sources and Types")), GBC.eol().insets(0,5,0,0));
                for (DownloadTask task : downloadTasks) {
                        add(task.getCheckBox(), GBC.eol().insets(20,0,0,0));
                        task.getCheckBox().setSelected(Main.pref.getBoolean("download."+task.getPreferencesSuffix()));
                }
                
                // predefined download selections
                downloadSelections.add(new BoundingBoxSelection());
                downloadSelections.add(new BookmarkSelection());        
                downloadSelections.add(new WorldChooser());
                
                // add selections from plugins
                for (PluginProxy p : Main.plugins) {
                        p.addDownloadSelection(downloadSelections);
                }
                
                // now everybody may add their tab to the tabbed pane
                // (not done right away to allow plugins to remove one of
                // the default selectors!)
                for (DownloadSelection s : downloadSelections) {
                        s.addGui(this);
                }
                
                if (Main.map != null) {
                        MapView mv = Main.map.mapView;
                        minlon = mv.getLatLon(0, mv.getHeight()).lon();
                        minlat = mv.getLatLon(0, mv.getHeight()).lat();
                        maxlon = mv.getLatLon(mv.getWidth(), 0).lon();
                        maxlat = mv.getLatLon(mv.getWidth(), 0).lat();
                        boundingBoxChanged(null);
                }

                newLayer = new JCheckBox(tr("Download as new layer"), Main.pref.getBoolean("download.newlayer", true));
                add(newLayer, GBC.eol().insets(0,5,0,0));

                add(new JLabel(tr("Download Area")), GBC.eol().insets(0,5,0,0));
                add(tabpane, GBC.eol().fill());
                
                try {
                        tabpane.setSelectedIndex(Integer.parseInt(Main.pref.get("download.tab", "0")));
                } catch (Exception ex) {
                        Main.pref.put("download.tab", "0");
                }
        }
        
        /**
         * Distributes a "bounding box changed" from ohne DownloadSelection 
         * object to the others, so they may update or clear their input 
         * fields.
         * 
         * @param eventSource - the DownloadSelection object that fired this notification.
         */
        public void boundingBoxChanged(DownloadSelection eventSource) {
                for (DownloadSelection s : downloadSelections) {
                        if (s != eventSource) s.boundingBoxChanged(this);
                }       
        }

        /*
         * Returns currently selected tab.
         */
        public int getSelectedTab() {
                return tabpane.getSelectedIndex();
        }
}