/*******************************************************************************
 * Copyright (c) 2012 Rushan R. Gilmullin and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Rushan R. Gilmullin - initial API and implementation
 *******************************************************************************/

package org.eclipse.osbp.vaaclipse.widgets.client.ui.stackwidget;

import java.util.logging.Logger;

import org.eclipse.osbp.vaaclipse.widgets.StackWidget;

import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.ui.Widget;
import com.vaadin.client.ApplicationConnection;
import com.vaadin.client.UIDL;
import com.vaadin.client.communication.StateChangeEvent;
import com.vaadin.shared.ui.Connect;

import fi.jasoft.dragdroplayouts.client.VDragFilter;
import fi.jasoft.dragdroplayouts.client.ui.interfaces.DDLayoutState;
import fi.jasoft.dragdroplayouts.client.ui.tabsheet.DDTabsheetConnector;

/**
 * @author rushan
 * 
 */
@Connect(StackWidget.class)
public class StackWidgetConnector extends DDTabsheetConnector {
	Logger logger = Logger.getLogger(StackWidgetConnector.class.getName());

	@Override
	protected Widget createWidget() {
		return GWT.create(VStackWidget.class);
	}

	@Override
	public VStackWidget getWidget() {
		return (VStackWidget) super.getWidget();
	}

	/**
	 * Called whenever an update is received from the server
	 */
	public void updateFromUIDL(UIDL uidl, ApplicationConnection client) {
		VStackWidget stackWidget = getWidget();

		stackWidget.id = uidl.getId();
		stackWidget.client = client;

		if (uidl.getIntAttribute("svoi") == 5) {
			int state = uidl.getIntAttribute("vaadock_tabsheet_state");
			stackWidget.setState(state);
			stackWidget.setMinmaxEnabled(uidl
					.getBooleanAttribute("minmax_enabled"));
		}

		if (isRealUpdate(uidl) && !uidl.hasAttribute("hidden")) {
			UIDL acceptCrit = uidl.getChildByTagName("-ac");
			if (acceptCrit == null) {
				getWidget().setDropHandler(null);
			} else {
				if (getWidget().getDropHandler() == null) {
					getWidget().setDropHandler(
							new VStackWidgetDropHandler(getWidget(), this));
					logger.info("updateFromUIDL: VStackWidgetDropHandler installed");
				}
				getWidget().getDropHandler().updateAcceptRules(acceptCrit);
			}
		}

		super.updateFromUIDL(uidl, client);
	}

	@Override
	public void onStateChanged(StateChangeEvent stateChangeEvent) {
		super.onStateChanged(stateChangeEvent);
		getWidget().setDragFilter(new VSWDragFilter(getState().ddState));
	}

	private class VSWDragFilter extends VDragFilter {

		public VSWDragFilter(DDLayoutState state) {
			super(state);
		}

		@Override
		public boolean isDraggable(Widget widget) {
			return true;
		}
	}
}