SampleListViewer.java Source code

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Here is the source code for SampleListViewer.java

Source

/******************************************************************************
 * All Right Reserved. 
 * Copyright (c) 1998, 2004 Jackwind Li Guojie
 * 
 * Created on Feb 15, 2004 10:57:32 AM by JACK
 * $Id$
 * 
 *****************************************************************************/

import java.util.Iterator;
import java.util.Vector;

import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.ListViewer;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;
import org.eclipse.jface.viewers.ViewerSorter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;

public class SampleListViewer {
    Display display = new Display();
    Shell shell = new Shell(display);

    ListViewer listViewer;

    /**
     * Represents programming languages. 
     *
     */
    public static class Language {
        public String genre;
        public boolean isObjectOriented;

        public Language() {
        }

        public Language(String genre, boolean isObjectOriented) {
            this.genre = genre;
            this.isObjectOriented = isObjectOriented;
        }

        public String toString() {
            return "Lang: " + genre + " [" + (isObjectOriented ? "Object-oriented" : "Procedural") + "]";
        }
    }

    Vector languages = new Vector();

    private void init() {
        languages.add(new Language("Java", true));
        languages.add(new Language("C", false));
        languages.add(new Language("C++", true));
        languages.add(new Language("SmallTalk", true));

        listViewer = new ListViewer(shell);

        listViewer.setContentProvider(new IStructuredContentProvider() {
            public Object[] getElements(Object inputElement) {
                Vector v = (Vector) inputElement;
                return v.toArray();
            }

            public void dispose() {
                System.out.println("Disposing ...");
            }

            public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
                System.out.println("Input changed: old=" + oldInput + ", new=" + newInput);
            }
        });

        //listViewer.setContentProvider(new ArrayContentProvider());

        listViewer.setInput(languages);

        listViewer.setLabelProvider(new LabelProvider() {
            public Image getImage(Object element) {
                return null;
            }

            public String getText(Object element) {
                return ((Language) element).genre;
            }
        });

        listViewer.addSelectionChangedListener(new ISelectionChangedListener() {
            public void selectionChanged(SelectionChangedEvent event) {
                IStructuredSelection selection = (IStructuredSelection) event.getSelection();
                StringBuffer sb = new StringBuffer("Selection - ");
                sb.append("tatal " + selection.size() + " items selected: ");
                for (Iterator iterator = selection.iterator(); iterator.hasNext();) {
                    sb.append(iterator.next() + ", ");
                }
                System.out.println(sb);
            }
        });

        listViewer.addFilter(new ViewerFilter() {
            public boolean select(Viewer viewer, Object parentElement, Object element) {

                if (((Language) element).isObjectOriented)
                    return true;
                else
                    return false;
            }
        });

        listViewer.setSorter(new ViewerSorter() {
            public int compare(Viewer viewer, Object e1, Object e2) {
                return ((Language) e1).genre.compareTo(((Language) e2).genre);
            }

        });

        //      Object[] toBeSelectedItems = new Object[2];
        //      toBeSelectedItems[0] = languages.elementAt(languages.size()-1);
        //      toBeSelectedItems[1] = languages.elementAt(languages.size()-2);
        //      IStructuredSelection selection = new StructuredSelection(toBeSelectedItems);
        //      
        //      listViewer.setSelection(selection);

        //      
        //      Vector v = new Vector();
        //      v.addElement(new Language("VB", true));
        //      
        //      listViewer.setInput(v);
        //      
        //      listViewer.add(new Language("C#", true));
    }

    Button buttonAdd;
    Button buttonRemove;
    Button buttonModify;

    private void addButtons() {
        Composite composite = new Composite(shell, SWT.NULL);
        FillLayout fillLayout = new FillLayout(SWT.VERTICAL);
        fillLayout.spacing = 2;

        composite.setLayout(fillLayout);

        buttonAdd = new Button(composite, SWT.PUSH);
        buttonAdd.setText("Add");

        buttonModify = new Button(composite, SWT.PUSH);
        buttonModify.setText("Modify");

        buttonRemove = new Button(composite, SWT.PUSH);
        buttonRemove.setText("Remove");

        buttonAdd.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                //            String text = OptionPane.showInputDialog(shell, "New language genre: ", "Add new element", null);
                //         if(text != null) {
                //         languages.add(new Language(text, true));
                //   }

                listViewer.refresh(false);
            }
        });

        buttonModify.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                IStructuredSelection selection = (IStructuredSelection) listViewer.getSelection();
                Language language = (Language) selection.getFirstElement();
                if (language == null) {
                    System.out.println("Please select a language first.");
                    return;
                }

                //            String text = OptionPane.showInputDialog(shell, "Rename: ", "Modify genre", language.genre);
                //         if(text != null) {
                //         language.genre = text;
                //   }

                listViewer.update(language, null);
            }
        });

        buttonRemove.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                IStructuredSelection selection = (IStructuredSelection) listViewer.getSelection();
                Language language = (Language) selection.getFirstElement();
                if (language == null) {
                    System.out.println("Please select a language first.");
                    return;
                }

                languages.remove(language);
                System.out.println("Removed: " + language);

                listViewer.refresh(false);
            }
        });
    }

    public SampleListViewer() {
        RowLayout rowLayout = new RowLayout();
        shell.setLayout(rowLayout);

        (new Label(shell, SWT.NULL)).setText("What programming languages are you proficient in? ");

        init();

        addButtons();

        shell.pack();
        shell.open();
        //textUser.forceFocus();

        // Set up the event loop.
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                // If no more entries in event queue
                display.sleep();
            }
        }

        display.dispose();
    }

    public static void main(String[] args) {
        new SampleListViewer();
    }
}