scrum.client.test.DndTestWidget.java Source code

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Here is the source code for scrum.client.test.DndTestWidget.java

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/*
 * Copyright 2011 Witoslaw Koczewsi <wi@koczewski.de>, Artjom Kochtchi
 * 
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public
 * License as published by the Free Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
 * for more details.
 * 
 * You should have received a copy of the GNU General Public License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 */
package scrum.client.test;

import com.allen_sauer.gwt.dnd.client.DragContext;
import com.allen_sauer.gwt.dnd.client.PickupDragController;
import com.allen_sauer.gwt.dnd.client.VetoDragException;
import com.allen_sauer.gwt.dnd.client.drop.DropController;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.ui.AbsolutePanel;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.MouseListener;
import com.google.gwt.user.client.ui.MouseListenerCollection;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.SourcesMouseEvents;
import com.google.gwt.user.client.ui.Widget;

public class DndTestWidget extends Composite {

    public DndTestWidget() {
        AbsolutePanel dndPanel = new AbsolutePanel();
        dndPanel.setPixelSize(400, 400);

        final Composite drag = new DragComposite();
        final Label drop = new Label("drop");

        PickupDragController dragController = new PickupDragController(RootPanel.get(), true);
        dragController.setBehaviorDragProxy(true);
        dragController.setBehaviorConstrainedToBoundaryPanel(false);
        dragController.setBehaviorMultipleSelection(true);
        DropController dropController = new DropController() {

            public Widget getDropTarget() {
                return drop;
            }

            public void onDrop(DragContext context) {
                drop.setText(drop.getText() + ".");
            }

            public void onEnter(DragContext context) {
            }

            public void onLeave(DragContext context) {
            }

            public void onMove(DragContext context) {
            }

            public void onPreviewDrop(DragContext context) throws VetoDragException {
            }
        };

        dragController.registerDropController(dropController);
        dragController.makeDraggable(drag);

        dndPanel.add(drag);
        dndPanel.add(drop);
        initWidget(dndPanel);
    }

    private static class DragComposite extends Composite implements SourcesMouseEvents {

        MouseListenerCollection mouseListeners;

        public DragComposite() {
            initWidget(new Label("ownDragWidget"));
        }

        public void addMouseListener(MouseListener listener) {
            if (mouseListeners == null) {
                mouseListeners = new MouseListenerCollection();
                sinkEvents(Event.MOUSEEVENTS);
            }
            mouseListeners.add(listener);
        }

        public void removeMouseListener(MouseListener listener) {
            if (mouseListeners != null) {
                mouseListeners.remove(listener);
            }
        }

        @Override
        public void onBrowserEvent(Event event) {
            switch (DOM.eventGetType(event)) {
            case Event.ONMOUSEDOWN:
            case Event.ONMOUSEUP:
            case Event.ONMOUSEMOVE:
            case Event.ONMOUSEOVER:
            case Event.ONMOUSEOUT:
                mouseListeners.fireMouseEvent(this, event);
                break;
            }
        }

    }
}