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/**
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* Copyright (C) 2017 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.combo;
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import org.eclipse.jface.viewers.ComboViewer;
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import org.eclipse.jface.viewers.ILabelProvider;
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import org.eclipse.jface.viewers.ISelectionChangedListener;
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import org.eclipse.jface.viewers.IStructuredContentProvider;
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import org.eclipse.jface.viewers.IStructuredSelection;
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import org.eclipse.swt.SWT;
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import org.eclipse.swt.layout.FillLayout;
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import org.eclipse.swt.widgets.Combo;
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import org.eclipse.swt.widgets.Composite;
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/**
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*
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* Abstract generic combo.
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*
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* @author pplitzner
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* @since Apr 10, 2018
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*
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* @param <T> the type of the elements to show in the combo
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*/
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public abstract class AbstractComboComposite<T> extends Composite{
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private ComboViewer viewer;
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public AbstractComboComposite(Composite parent, int style){
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super(parent, style);
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setLayout(new FillLayout());
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viewer = new ComboViewer(new Combo(this, SWT.READ_ONLY | SWT.SINGLE));
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viewer.setContentProvider(getContentProvider());
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viewer.setLabelProvider(getLabelProvider());
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}
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public void setInput(Object input){
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viewer.setInput(input);
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}
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public T getSelection(){
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IStructuredSelection structuredSelection = viewer.getStructuredSelection();
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if(structuredSelection!=null && !structuredSelection.isEmpty()){
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return (T) structuredSelection.getFirstElement();
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}
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return null;
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}
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public void setText(String string){
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viewer.getCombo().setText(string);
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}
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public void setElement(T element){
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if(element==null){
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viewer.getCombo().deselectAll();
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}
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int index = viewer.getCombo().indexOf(getElementLabel(element));
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viewer.getCombo().select(index);
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}
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public void addSelectionChangedListener(ISelectionChangedListener listener){
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viewer.addSelectionChangedListener(listener);
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}
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public abstract String getElementLabel(T element);
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public abstract IStructuredContentProvider getContentProvider();
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public abstract ILabelProvider getLabelProvider();
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}
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