Sample ListViewer
/******************************************************************************
* 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();
}
}
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