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// $Id$
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/**
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* Copyright (C) 2007 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.taxeditor.ui.element;
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import java.util.HashSet;
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import java.util.Set;
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import org.eclipse.jface.viewers.ISelection;
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import org.eclipse.jface.viewers.ISelectionChangedListener;
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import org.eclipse.jface.viewers.ISelectionProvider;
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import org.eclipse.jface.viewers.IStructuredSelection;
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import org.eclipse.jface.viewers.SelectionChangedEvent;
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import org.eclipse.jface.viewers.StructuredSelection;
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import org.eclipse.swt.SWTException;
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import org.eclipse.swt.events.SelectionEvent;
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import org.eclipse.swt.events.SelectionListener;
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import org.eclipse.swt.widgets.Control;
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import org.eclipse.swt.widgets.Widget;
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import eu.etaxonomy.taxeditor.model.MessagingUtils;
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/**
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* <p>SelectionArbitrator class.</p>
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*
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* @author n.hoffmann
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* @created Feb 25, 2010
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* @version 1.0
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*/
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public class SelectionArbitrator implements SelectionListener, ISelectionChangedListener{
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private IEntityElement entityElement;
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private Set<ISelectionProvider> selectionProviders = new HashSet<ISelectionProvider>();
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/**
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* <p>Constructor for SelectionArbitrator.</p>
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*/
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public SelectionArbitrator(){}
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/**
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* <p>Constructor for SelectionArbitrator.</p>
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*
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* @param selectableComposite a {@link eu.etaxonomy.taxeditor.ui.element.IEntityElement} object.
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*/
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public SelectionArbitrator(IEntityElement selectableComposite){
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this.entityElement = selectableComposite;
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}
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/** {@inheritDoc} */
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public void widgetSelected(SelectionEvent e) {
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Widget widget = e.widget;
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if(widget instanceof Control){
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Control control = (Control) widget;
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if(isWidgetPartOfFormElement(control, entityElement)){
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if(entityElement.getEntity() != null){
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IStructuredSelection selection = new StructuredSelection(entityElement.getEntity());
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setSelection(selection);
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}
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}
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}
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}
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private void setSelection(ISelection selection){
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for(ISelectionProvider selectionProvider : selectionProviders){
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selectionProvider.setSelection(selection);
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}
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}
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private boolean isWidgetPartOfFormElement(Control widget, ICdmFormElement element){
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// check if widget is the controls
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if(widget.equals(element.getLayoutComposite())){
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return true;
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}
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// check if widget is controlled by the given element
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for(Control control : element.getControls()){
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if(control.equals(widget)) return true;
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}
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// descend into child elements
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for(ICdmFormElement childElement : element.getElements()){
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isWidgetPartOfFormElement(widget, childElement);
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}
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return false;
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}
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/**
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* <p>addSelectionProvider</p>
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*
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* @param selectionProvider a {@link org.eclipse.jface.viewers.ISelectionProvider} object.
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*/
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public void addSelectionProvider(ISelectionProvider selectionProvider){
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selectionProviders.add(selectionProvider);
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}
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/**
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* <p>removeSelectionProvider</p>
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*
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* @param selectionProvider a {@link org.eclipse.jface.viewers.ISelectionProvider} object.
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*/
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public void removeSelectionProvider(ISelectionProvider selectionProvider){
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selectionProviders.remove(selectionProvider);
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}
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/** {@inheritDoc} */
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public void widgetDefaultSelected(SelectionEvent e) {}
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/**
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* <p>Getter for the field <code>entityElement</code>.</p>
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*
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* @return a {@link eu.etaxonomy.taxeditor.ui.element.IEntityElement} object.
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*/
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public IEntityElement getEntityElement() {
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return entityElement;
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}
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/**
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* <p>setEntityComposite</p>
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*
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* @param entityElement a {@link eu.etaxonomy.taxeditor.ui.element.IEntityElement} object.
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*/
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public void setEntityComposite(IEntityElement entityElement) {
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this.entityElement = entityElement;
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}
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/** {@inheritDoc} */
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public void selectionChanged(SelectionChangedEvent event) {
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// if(!(event.getSource() instanceof CdmDetailsViewer)){
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// return;
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// }
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try{
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entityElement.setSelected(false);
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}catch(SWTException e){
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MessagingUtils.error(getClass(), "Widgets of element are disposed", e);
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}
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ISelection selection = event.getSelection();
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if(selection != null && selection instanceof StructuredSelection){
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Object selectedElement = ((StructuredSelection) selection).getFirstElement();
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if(entityElement.getEntity() != null && entityElement.getEntity().equals(selectedElement)){
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entityElement.setSelected(true);
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}
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}
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}
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}
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