source: josm/trunk/src/org/openstreetmap/josm/gui/download/DownloadDialog.java@ 1180

// License: GPL. Copyright 2007 by Immanuel Scholz and others
package org.openstreetmap.josm.gui.download;

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

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

import javax.swing.JCheckBox;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
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 {

    // the JOptionPane that contains this dialog. required for the closeDialog() method.
    private JOptionPane optionPane;

    public interface DownloadTask {
        /**
         * Execute the download.
         */
        void download(DownloadAction action, double minlat, double minlon, double maxlat, double maxlon);
        void loadUrl(boolean newLayer, String url);
        /**
         * @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 final JLabel sizeCheck = new JLabel();

    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));
            // don't override defaults, if we (initially) don't have any preferences
            if(Main.pref.hasKey("download."+task.getPreferencesSuffix())) {
                task.getCheckBox().setSelected(Main.pref.getBoolean("download."+task.getPreferencesSuffix()));
            }
        }

        // predefined download selections
        downloadSelections.add(new BoundingBoxSelection());
        downloadSelections.add(new TileSelection());
        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);
        }
        else if (Main.pref.hasKey("osm-download.bounds")) {
            // read the bounding box from the preferences
            try {
                String bounds[] = Main.pref.get("osm-download.bounds").split(";");
                minlat = Double.parseDouble(bounds[0]);
                minlon = Double.parseDouble(bounds[1]);
                maxlat = Double.parseDouble(bounds[2]);
                maxlon = Double.parseDouble(bounds[3]);
                boundingBoxChanged(null);
            }
            catch (Exception e) {
                e.printStackTrace();
            }
        }

        newLayer = new JCheckBox(tr("Download as new layer"), Main.pref.getBoolean("download.newlayer", false));
        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");
        }

        Font labelFont = sizeCheck.getFont();
        sizeCheck.setFont(labelFont.deriveFont(Font.PLAIN, labelFont.getSize()));
        add(sizeCheck, GBC.eop().insets(0,5,5,10));
    }

    private void updateSizeCheck() {
        if ((maxlon-minlon)*(maxlat-minlat) > Main.pref.getDouble("osm-server.max-request-area", 0.25)) {
            sizeCheck.setText(tr("Download area too large; will probably be rejected by server"));
            sizeCheck.setForeground(Color.red);
        } else {
            sizeCheck.setText(tr("Download area ok, size probably acceptable to server"));
            sizeCheck.setForeground(Color.darkGray);
        }
    }

    /**
     * Distributes a "bounding box changed" from one 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);
        }
        updateSizeCheck();
    }

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

    /**
     * Closes the download dialog. This is intended to be called by one of
     * the various download area selection "plugins".
     *
     * @param download true to download selected data, false to cancel download
     */
    public void closeDownloadDialog(boolean download) {
        optionPane.setValue(download ? JOptionPane.OK_OPTION : JOptionPane.CANCEL_OPTION);
    }

    /**
     * Has to be called after this dialog has been added to a JOptionPane.
     * @param optionPane
     */
    public void setOptionPane(JOptionPane optionPane) {
        this.optionPane = optionPane;
    }
}