EDIT

/**

* Copyright (C) 2007 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.taxeditor.editor.name.e4.container;

import java.util.ArrayList;

import java.util.List;

import org.eclipse.e4.core.contexts.IEclipseContext;

import org.eclipse.swt.SWT;

import org.eclipse.swt.dnd.DND;

import org.eclipse.swt.dnd.DropTarget;

import org.eclipse.swt.dnd.DropTargetListener;

import org.eclipse.swt.dnd.Transfer;

import org.eclipse.swt.graphics.Color;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Display;

import org.eclipse.ui.forms.widgets.TableWrapData;

import org.eclipse.ui.forms.widgets.TableWrapLayout;

import eu.etaxonomy.cdm.model.common.CdmBase;

import eu.etaxonomy.taxeditor.editor.CdmDataTransfer;

import eu.etaxonomy.taxeditor.editor.name.e4.IDropTargetableE4;

import eu.etaxonomy.taxeditor.editor.name.e4.TaxonNameEditorE4;

import eu.etaxonomy.taxeditor.editor.name.e4.dnd.NameEditorDropTargetEffect;

import eu.etaxonomy.taxeditor.editor.name.e4.dnd.NameEditorDropTargetListenerE4;

import eu.etaxonomy.taxeditor.model.AbstractUtility;

import eu.etaxonomy.taxeditor.preference.Resources;

/**

 *

 * @author pplitzner

 * @date Aug 24, 2017

 *

 */

public abstract class AbstractGroupE4 implements IDropTargetableE4{

	private Composite control;

	private IEclipseContext context;

	private final List<AbstractGroupedContainerE4> groupedContainers = new ArrayList<>();

	protected TaxonNameEditorE4 editor;

	private DropTarget target;

	private DropTargetListener dropListener;

	public AbstractGroupE4(TaxonNameEditorE4 editor){

		this.editor = editor;

		this.context = editor.getContext();

	}

	protected void createContent(){

		createControl();

		createContainers();

		// Drop functionality

		this.setDroppable(true);

		editor.getManagedForm().reflow(true);

	}

	protected void createControl() {

		control = editor.getToolkit().createComposite(editor.getControl());

		control.setLayoutData(new TableWrapData(TableWrapData.FILL_GRAB));

		TableWrapLayout layout = new TableWrapLayout();

		layout.topMargin = 0;

		layout.rightMargin = 0;

		layout.bottomMargin = 1;

		layout.leftMargin = 0;

		layout.verticalSpacing = 0;

		layout.horizontalSpacing = 0;

		control.setLayout(layout);

		control.setBackground(Display.getDefault().getSystemColor(SWT.COLOR_GRAY));

	}

	public void add(AbstractGroupedContainerE4 groupedContainer){

		groupedContainers.add(groupedContainer);

	}

	public void remove(AbstractGroupedContainerE4 groupedContainer){

		groupedContainer.dispose();

		groupedContainers.remove(groupedContainer);

		if(!(this instanceof AcceptedGroupE4) && groupedContainers.isEmpty()){

			getEditor().removeGroup(this);

		}

	}

	public List<AbstractGroupedContainerE4> getGroupedContainers(){

		return groupedContainers;

	}

	public void setDroppable(boolean droppable) {

		if (droppable) {

			Transfer[] types = new Transfer[] {CdmDataTransfer.getInstance()};

			int operations = DND.DROP_MOVE;

			target = new DropTarget(control, operations);

			target.setTransfer(types);

			dropListener = new NameEditorDropTargetListenerE4(this);

			target.addDropListener(dropListener);

			target.setDropTargetEffect(new NameEditorDropTargetEffect(control));

		} else {

			if (dropListener != null) {

				target.removeDropListener(dropListener);

			}

		}

	}

	@Override

	public IEclipseContext getContext() {

	    return context;

	}

	@Override

    public TaxonNameEditorE4 getEditor() {

		return editor;

	}

	@Override

    public void dragEntered() {

		Color color = AbstractUtility.getColor(Resources.COLOR_DRAG_ENTER);

		for(AbstractGroupedContainerE4 container : groupedContainers){

			container.setBackground(color);

		}

	}

	@Override

    public void dragLeft() {

		for(AbstractGroupedContainerE4 container : groupedContainers){

			container.restoreColor();

		}

	}

	/** {@inheritDoc} */

	@Override

    public boolean postOperation(CdmBase objectAffectedByOperation) {

		editor.changed(objectAffectedByOperation);

		redraw();

		return true;

	}

	public void redraw(){

		emptyGroup();

		createContainers();

	}

	protected abstract void createContainers();

	@Override

	public Composite getControl() {

		return control;

	}

	@Override

	public boolean onComplete() {

		return true;

	}

	public void dispose(){

		if(getControl() != null){

			for(AbstractGroupedContainerE4 container : getGroupedContainers()){

				container.dispose();

			}

			getControl().setMenu(null);

			getControl().dispose();

		}

	}

	protected void emptyGroup(){

		for(AbstractGroupedContainerE4 container : groupedContainers){

			container.dispose();

		}

		groupedContainers.clear();

	}

}