eu.etaxonomy.taxeditor.store/src/main/java/eu/etaxonomy/taxeditor/ui/combo/AbstractComboComposite.java

   1 /**
   2 * Copyright (C) 2017 EDIT
   3 * European Distributed Institute of Taxonomy
   4 * http://www.e-taxonomy.eu
   5 *
   6 * The contents of this file are subject to the Mozilla Public License Version 1.1
   7 * See LICENSE.TXT at the top of this package for the full license terms.
   8 */
   9 package eu.etaxonomy.taxeditor.ui.combo;
  10
  11 import org.eclipse.jface.viewers.ComboViewer;
  12 import org.eclipse.jface.viewers.ILabelProvider;
  13 import org.eclipse.jface.viewers.ISelectionChangedListener;
  14 import org.eclipse.jface.viewers.IStructuredContentProvider;
  15 import org.eclipse.jface.viewers.IStructuredSelection;
  16 import org.eclipse.swt.SWT;
  17 import org.eclipse.swt.custom.CCombo;
  18 import org.eclipse.swt.layout.FillLayout;
  19 import org.eclipse.swt.widgets.Composite;
  20
  21 /**
  22  *
  23  * Abstract generic combo.
  24  *
  25  * @author pplitzner
  26  * @since Apr 10, 2018
  27  *
  28  * @param <T> the type of the elements to show in the combo
  29  */
  30 public abstract class AbstractComboComposite<T> extends Composite{
  31
  32     private ComboViewer viewer;
  33
  34     public AbstractComboComposite(Composite parent, int style){
  35         super(parent, style);
  36         setLayout(new FillLayout());
  37         viewer = new ComboViewer(new CCombo(this, SWT.READ_ONLY | SWT.SINGLE));
  38         viewer.setContentProvider(getContentProvider());
  39         viewer.setLabelProvider(getLabelProvider());
  40     }
  41
  42     public void setInput(Object input){
  43         viewer.setInput(input);
  44     }
  45
  46     public T getSelection(){
  47         IStructuredSelection structuredSelection = viewer.getStructuredSelection();
  48         if(structuredSelection!=null && !structuredSelection.isEmpty()){
  49             return (T) structuredSelection.getFirstElement();
  50         }
  51         return null;
  52     }
  53
  54     public void setElement(T element){
  55         int index = viewer.getCCombo().indexOf(getElementLabel(element));
  56         viewer.getCCombo().select(index);
  57     }
  58
  59
  60     public void addSelectionChangedListener(ISelectionChangedListener listener){
  61         viewer.addSelectionChangedListener(listener);
  62     }
  63
  64     public abstract String getElementLabel(T element);
  65     public abstract IStructuredContentProvider getContentProvider();
  66     public abstract ILabelProvider getLabelProvider();
  67
  68 }