DefaultHorizontalSplitPanelDropHandler.java

/*
 * Copyright 2011 John Ahlroos
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package fi.jasoft.dragdroplayouts.drophandlers;

import com.vaadin.event.dd.DragAndDropEvent;
import com.vaadin.event.dd.DropHandler;
import com.vaadin.event.dd.acceptcriteria.AcceptCriterion;
import com.vaadin.event.dd.acceptcriteria.Not;
import com.vaadin.terminal.Sizeable;
import com.vaadin.terminal.gwt.client.MouseEventDetails;
import com.vaadin.terminal.gwt.client.ui.dd.HorizontalDropLocation;
import com.vaadin.ui.AbsoluteLayout.ComponentPosition;
import com.vaadin.ui.Component;
import com.vaadin.ui.ComponentContainer;

import fi.jasoft.dragdroplayouts.DDAbsoluteLayout;
import fi.jasoft.dragdroplayouts.DDHorizontalSplitPanel;
import fi.jasoft.dragdroplayouts.DDHorizontalSplitPanel.HorizontalSplitPanelTargetDetails;
import fi.jasoft.dragdroplayouts.events.HorizontalLocationIs;
import fi.jasoft.dragdroplayouts.events.LayoutBoundTransferable;

@SuppressWarnings("serial")
public class DefaultHorizontalSplitPanelDropHandler extends AbstractDefaultLayoutDropHandler{

    @Override
    public AcceptCriterion getAcceptCriterion() {
        // Only allow dropping in slots, not on the center bar
        return new Not(HorizontalLocationIs.CENTER);
    }

	@Override
	protected void handleComponentReordering(DragAndDropEvent event) {
		handleDropFromLayout(event);
	}

	@Override
	protected void handleDropFromLayout(DragAndDropEvent event) {
		LayoutBoundTransferable transferable = (LayoutBoundTransferable) event
	                .getTransferable();
		ComponentContainer source = (ComponentContainer) transferable
	                .getSourceComponent();
		HorizontalSplitPanelTargetDetails details = (HorizontalSplitPanelTargetDetails) event
                .getTargetDetails();
		Component component = transferable.getComponent();
        DDHorizontalSplitPanel panel = (DDHorizontalSplitPanel) details
                .getTarget();
		 
		 // Remove component from its source
        source.removeComponent(component);

        if (details.getDropLocation() == HorizontalDropLocation.LEFT) {
            // Dropped in the left area
            panel.setFirstComponent(component);

        } else if (details.getDropLocation() == HorizontalDropLocation.RIGHT) {
            // Dropped in the right area
            panel.setSecondComponent(component);
        }
	}
}