/*******************************************************************************
 * Copyright (c) 2015 MINRES Technologies GmbH 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:
 *     MINRES Technologies GmbH - initial API and implementation
 *******************************************************************************/

package com.minres.scviewer.e4.application.handlers;

import javax.inject.Named;

import org.eclipse.e4.core.di.annotations.CanExecute;
import org.eclipse.e4.core.di.annotations.Execute;
import org.eclipse.e4.ui.model.application.ui.basic.MPart;
import org.eclipse.e4.ui.workbench.modeling.EPartService;
import org.eclipse.e4.ui.workbench.modeling.ESelectionService;
import org.eclipse.jface.viewers.IStructuredSelection;

import com.minres.scviewer.database.ITx;
import com.minres.scviewer.database.ui.GotoDirection;
import com.minres.scviewer.e4.application.parts.WaveformViewerPart;

public class NavigateTrans {

	final static String PARAMTER_ID="com.minres.scviewer.e4.application.command.navigateTransCommand.parameter.dir";
	
	@CanExecute
	public Boolean canExecute(ESelectionService selectionService){
		Object sel = selectionService.getSelection();
		if( sel instanceof IStructuredSelection) {
			Object o= ((IStructuredSelection)sel).getFirstElement();
			return o instanceof ITx;
		}
		return false;
	}
	
	@Execute
	public void execute(@Named(PARAMTER_ID) String param, EPartService partService) {
		MPart part = partService.getActivePart();
		Object obj = part.getObject();
		if(obj instanceof WaveformViewerPart){
			if("next".equalsIgnoreCase(param))
				((WaveformViewerPart)obj).moveSelection(GotoDirection.NEXT);
			else if("prev".equalsIgnoreCase(param))
				((WaveformViewerPart)obj).moveSelection(GotoDirection.PREV);
		}
	}
}