Java tutorial
import java.util.ArrayList; import java.util.Collections; import java.util.List; import org.eclipse.jface.viewers.CellEditor; import org.eclipse.jface.viewers.CheckboxCellEditor; import org.eclipse.jface.viewers.ColorCellEditor; import org.eclipse.jface.viewers.ComboBoxCellEditor; import org.eclipse.jface.viewers.ICellModifier; import org.eclipse.jface.viewers.ILabelProviderListener; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.ITableLabelProvider; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.TextCellEditor; import org.eclipse.jface.viewers.Viewer; 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.graphics.RGB; import org.eclipse.swt.layout.GridData; 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.Item; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.TableColumn; /** * This class demonstrates CellEditors. It allows you to create and edit Person * objects */ public class PersonEditor extends ApplicationWindow { // Table column names/properties public static final String NAME = "Name"; public static final String MALE = "Male?"; public static final String AGE = "Age Range"; public static final String SHIRT_COLOR = "Shirt Color"; public static final String[] PROPS = { NAME, MALE, AGE, SHIRT_COLOR }; // The data model private java.util.List people; /** * Constructs a PersonEditor */ public PersonEditor() { super(null); people = new ArrayList(); } /** * 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("Person Editor"); shell.setSize(400, 400); } /** * 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 button to create the new person Button newPerson = new Button(composite, SWT.PUSH); newPerson.setText("Create New Person"); // Add the TableViewer final TableViewer tv = new TableViewer(composite, SWT.FULL_SELECTION); tv.setContentProvider(new PersonContentProvider()); tv.setLabelProvider(new PersonLabelProvider()); tv.setInput(people); // Set up the table Table table = tv.getTable(); table.setLayoutData(new GridData(GridData.FILL_BOTH)); new TableColumn(table, SWT.CENTER).setText(NAME); new TableColumn(table, SWT.CENTER).setText(MALE); new TableColumn(table, SWT.CENTER).setText(AGE); new TableColumn(table, SWT.CENTER).setText(SHIRT_COLOR); for (int i = 0, n = table.getColumnCount(); i < n; i++) { table.getColumn(i).pack(); } table.setHeaderVisible(true); table.setLinesVisible(true); // Add a new person when the user clicks button newPerson.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent event) { Person p = new Person(); p.setName("Name"); p.setMale(true); p.setAgeRange(Integer.valueOf("0")); p.setShirtColor(new RGB(255, 0, 0)); people.add(p); tv.refresh(); } }); // Create the cell editors CellEditor[] editors = new CellEditor[4]; editors[0] = new TextCellEditor(table); editors[1] = new CheckboxCellEditor(table); editors[2] = new ComboBoxCellEditor(table, AgeRange.INSTANCES, SWT.READ_ONLY); editors[3] = new ColorCellEditor(table); // Set the editors, cell modifier, and column properties tv.setColumnProperties(PROPS); tv.setCellModifier(new PersonCellModifier(tv)); tv.setCellEditors(editors); return composite; } /** * The application entry point * * @param args * the command line arguments */ public static void main(String[] args) { new PersonEditor().run(); } } /** * This class provides the content for the person table */ class PersonContentProvider implements IStructuredContentProvider { /** * Returns the Person objects */ public Object[] getElements(Object inputElement) { return ((List) inputElement).toArray(); } /** * Disposes any created resources */ public void dispose() { // Do nothing } /** * Called when the input changes */ public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { // Ignore } } /** * 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 } } /** * This class represents the cell modifier for the PersonEditor program */ class PersonCellModifier implements ICellModifier { private Viewer viewer; public PersonCellModifier(Viewer viewer) { this.viewer = viewer; } /** * Returns whether the property can be modified * * @param element * the element * @param property * the property * @return boolean */ public boolean canModify(Object element, String property) { // Allow editing of all values return true; } /** * Returns the value for the property * * @param element * the element * @param property * the property * @return Object */ public Object getValue(Object element, String property) { Person p = (Person) element; if (PersonEditor.NAME.equals(property)) return p.getName(); else if (PersonEditor.MALE.equals(property)) return Boolean.valueOf(p.isMale()); else if (PersonEditor.AGE.equals(property)) return p.getAgeRange(); else if (PersonEditor.SHIRT_COLOR.equals(property)) return p.getShirtColor(); else return null; } /** * Modifies the element * * @param element * the element * @param property * the property * @param value * the value */ public void modify(Object element, String property, Object value) { if (element instanceof Item) element = ((Item) element).getData(); Person p = (Person) element; if (PersonEditor.NAME.equals(property)) p.setName((String) value); else if (PersonEditor.MALE.equals(property)) p.setMale(((Boolean) value).booleanValue()); else if (PersonEditor.AGE.equals(property)) p.setAgeRange((Integer) value); else if (PersonEditor.SHIRT_COLOR.equals(property)) p.setShirtColor((RGB) value); // Force the viewer to refresh viewer.refresh(); } } /** * This class represents a person */ class Person { private String name; private boolean male; private Integer ageRange; private RGB shirtColor; /** * @return Returns the ageRange. */ public Integer getAgeRange() { return ageRange; } /** * @param ageRange * The ageRange to set. */ public void setAgeRange(Integer ageRange) { this.ageRange = ageRange; } /** * @return Returns the male. */ public boolean isMale() { return male; } /** * @param male * The male to set. */ public void setMale(boolean male) { this.male = male; } /** * @return Returns the name. */ public String getName() { return name; } /** * @param name * The name to set. */ public void setName(String name) { this.name = name; } /** * @return Returns the shirtColor. */ public RGB getShirtColor() { return shirtColor; } /** * @param shirtColor * The shirtColor to set. */ public void setShirtColor(RGB shirtColor) { this.shirtColor = shirtColor; } } /** * 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 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 person table */ class PersonLabelProvider implements ITableLabelProvider { /** * Returns the image * * @param element * the element * @param columnIndex * the column index * @return Image */ public Image getColumnImage(Object element, int columnIndex) { return null; } /** * Returns the column text * * @param element * the element * @param columnIndex * the column index * @return String */ public String getColumnText(Object element, int columnIndex) { Person person = (Person) element; switch (columnIndex) { case 0: return person.getName(); case 1: return Boolean.toString(person.isMale()); case 2: return AgeRange.INSTANCES[person.getAgeRange().intValue()]; case 3: return person.getShirtColor().toString(); } return null; } /** * Adds a listener * * @param listener * the listener */ public void addListener(ILabelProviderListener listener) { // Ignore it } /** * Disposes any created resources */ public void dispose() { // Nothing to dispose } /** * Returns whether altering this property on this element will affect the * label * * @param element * the element * @param property * the property * @return boolean */ public boolean isLabelProperty(Object element, String property) { return false; } /** * Removes a listener * * @param listener * the listener */ public void removeListener(ILabelProviderListener listener) { // Ignore } } /** * This class encapsulates age ranges */ class AgeRange { public static final String NONE = ""; public static final String BABY = "0 - 3"; public static final String TODDLER = "4 - 7"; public static final String CHILD = "8 - 12"; public static final String TEENAGER = "13 - 19"; public static final String ADULT = "20 - ?"; public static final String[] INSTANCES = { NONE, BABY, TODDLER, CHILD, TEENAGER, ADULT }; }