Demonstrates ListViewer
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.ListViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;
import org.eclipse.jface.window.ApplicationWindow;
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.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
/**
* This class demonstrates ListViewer.
*/
public class FoodList extends ApplicationWindow {
// The healthy filter
private HealthyFilter filter = new HealthyFilter();
/**
* FoodList constructor
*/
public FoodList() {
super(null);
}
/**
* Runs the application
*/
public void run() {
// Don't return from open() until window closes
setBlockOnOpen(true);
// Open the main window
open();
// Dispose the display
Display.getCurrent().dispose();
}
/**
* Configures the shell
*
* @param shell
* the shell
*/
protected void configureShell(Shell shell) {
super.configureShell(shell);
shell.setText("Food List");
}
/**
* Creates the main window's contents
*
* @param parent
* the main window
* @return Control
*/
protected Control createContents(Composite parent) {
Composite composite = new Composite(parent, SWT.NONE);
composite.setLayout(new GridLayout(1, false));
// Add a checkbox to toggle filter
Button filterHealthy = new Button(composite, SWT.CHECK);
filterHealthy.setText("&Show only healthy");
final ListViewer lv = new ListViewer(composite);
lv.setContentProvider(new FoodContentProvider());
lv.setLabelProvider(new FoodLabelProvider());
lv.setInput(new GroceryList());
// When user checks the checkbox, toggle the filter
filterHealthy.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
if (((Button) event.widget).getSelection())
lv.addFilter(filter);
else
lv.removeFilter(filter);
}
});
parent.pack();
return composite;
}
/**
* The application entry point
*
* @param args
* the command line arguments
*/
public static void main(String[] args) {
new FoodList().run();
}
}
/**
* This class filters only healthy items from the grocery list
*/
class HealthyFilter extends ViewerFilter {
/**
* Returns whether the specified element passes this filter
*
* @param arg0
* the viewer
* @param arg1
* the parent element
* @param arg2
* the element
* @return boolean
*/
public boolean select(Viewer arg0, Object arg1, Object arg2) {
return ((Food) arg2).isHealthy();
}
}
/**
* This class represents a type of food
*/
class Food {
// The name of the food
private String name;
// Is it healthy?
private boolean healthy;
/**
* Food constructor
*
* @param name
* the name
* @param healthy
* whether or not it's healthy
*/
public Food(String name, boolean healthy) {
this.name = name;
this.healthy = healthy;
}
/**
* Gets whether this is healthy
*
* @return boolean
*/
public boolean isHealthy() {
return healthy;
}
/**
* Gets the name
*
* @return String
*/
public String getName() {
return name;
}
}
/**
* This class provides the labels for the FoodList application
*/
class FoodLabelProvider implements ILabelProvider {
/**
* ListViewers don't support images
*
* @param arg0
* the element
* @return Image
*/
public Image getImage(Object arg0) {
return null;
}
/**
* Gets the text for an element
*
* @param arg0
* the element
* @return String
*/
public String getText(Object arg0) {
return ((Food) arg0).getName();
}
/**
* Adds a listener
*
* @param arg0
* the listener
*/
public void addListener(ILabelProviderListener arg0) {
// Throw it away
}
/**
* Disposes any resources
*/
public void dispose() {
// Nothing to dispose
}
/**
* Returns whether changing the specified property for the specified element
* affect the label
*
* @param arg0
* the element
* @param arg1
* the property
* @return boolean
*/
public boolean isLabelProperty(Object arg0, String arg1) {
return false;
}
/**
* Removes a listener
*
* @param arg0
* the listener
*/
public void removeListener(ILabelProviderListener arg0) {
// Ignore
}
}
/**
* This class contains all the foods on the "grocery list"
*/
class GroceryList {
// Holds the foods
private List foods;
/**
* Constructs a grocery list
*/
public GroceryList() {
foods = new ArrayList();
// Add some foods
foods.add(new Food("Broccoli", true));
foods.add(new Food("Bundt Cake", false));
foods.add(new Food("Cabbage", true));
foods.add(new Food("Candy Canes", false));
foods.add(new Food("Eggs", true));
foods.add(new Food("Potato Chips", false));
foods.add(new Food("Milk", true));
foods.add(new Food("Soda", false));
foods.add(new Food("Chicken", true));
foods.add(new Food("Cinnamon Rolls", false));
}
/**
* Returns the foods in this grocery list
*
* @return List
*/
public List getFoods() {
return Collections.unmodifiableList(foods);
}
}
/**
* This class provides the content for the FoodList application
*/
class FoodContentProvider implements IStructuredContentProvider {
/**
* Gets the food items for the list
*
* @param arg0
* the data model
* @return Object[]
*/
public Object[] getElements(Object arg0) {
return ((GroceryList) arg0).getFoods().toArray();
}
/**
* Disposes any created resources
*/
public void dispose() {
// Do nothing
}
/**
* Called when the input changes
*
* @param arg0
* the viewer
* @param arg1
* the old input
* @param arg2
* the new input
*/
public void inputChanged(Viewer arg0, Object arg1, Object arg2) {
// Do nothing
}
}
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