net.sf.mmm.client.base.gwt.dialog.DialogManagerImplGwt.java Source code

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Here is the source code for net.sf.mmm.client.base.gwt.dialog.DialogManagerImplGwt.java

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/* Copyright (c) The m-m-m Team, Licensed under the Apache License, Version 2.0
 * http://www.apache.org/licenses/LICENSE-2.0 */
package net.sf.mmm.client.base.gwt.dialog;

import net.sf.mmm.client.ui.api.dialog.ApplicationWindow;
import net.sf.mmm.client.ui.api.dialog.DialogPlace;
import net.sf.mmm.client.ui.base.dialog.AbstractDialogManager;

import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.RunAsyncCallback;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.Window.Location;

/**
 * This is the implementation of {@link net.sf.mmm.client.ui.api.dialog.DialogManager} for GWT.
 *
 * @author Joerg Hohwiller (hohwille at users.sourceforge.net)
 * @since 1.0.0
 */
public class DialogManagerImplGwt extends AbstractDialogManager {

    /**
     * The constructor.
     */
    public DialogManagerImplGwt() {

        super();
        History.addValueChangeHandler(new HistoryListener());
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void navigateBack() {

        History.back();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void navigateForward() {

        History.forward();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void navigateTo(DialogPlace place) {

        if (place.equals(getCurrentPlace())) {
            return;
        }
        History.newItem(place.toString(), false);
        show(place);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected DialogPlace getStartPlace() {

        String startToken = History.getToken();
        if ((startToken == null) || startToken.isEmpty()) {
            return null;
        }
        return DialogPlace.fromString(startToken);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public ApplicationWindow openInNewWindow(DialogPlace place) {

        String url = Location.getHref();
        String hash = Location.getHash();
        if ((hash != null) && (url.endsWith(hash))) {
            url = url.substring(0, url.length() - hash.length());
        }
        url = url + "#" + place.toString();
        String name = "_blank";
        String features = "";
        Window.open(url, name, features);

        // TODO
        return null;
    }

    /**
     * This method gets called whenever the {@link DialogPlace} changes.
     *
     * @param place is the new place.
     */
    protected void onNavigate(String place) {

        final DialogPlace dialogPlace = DialogPlace.fromString(place);
        GWT.runAsync(new RunAsyncCallback() {

            @Override
            public void onSuccess() {

                show(dialogPlace);
            }

            @Override
            public void onFailure(Throwable reason) {

                getContext().getPopupHelper().showPopup(reason);
            }
        });
    }

    /**
     * This inner class is the listener that gets notified whenever the {@link DialogPlace} changes.
     */
    private class HistoryListener implements ValueChangeHandler<String> {

        /**
         * {@inheritDoc}
         */
        @Override
        public void onValueChange(ValueChangeEvent<String> event) {

            String placeId = event.getValue();
            if ((placeId != null) && (!placeId.isEmpty())) {
                onNavigate(placeId);
            }
        }
    }

}