/*******************************************************************************
 * Copyright (c) 2006 The Pampered Chef, Inc. and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Coconut Palm Software, Inc. - Initial API and implementation
 ******************************************************************************/

package org.eclipse.jface.examples.databinding.snippets;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;

import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.beans.BeansObservables;
import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.core.databinding.observable.list.IObservableList;
import org.eclipse.core.databinding.observable.list.WritableList;
import org.eclipse.core.databinding.observable.map.CompositeMap;
import org.eclipse.core.databinding.observable.map.IObservableMap;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.jface.databinding.viewers.ObservableListContentProvider;
import org.eclipse.jface.databinding.viewers.ObservableMapLabelProvider;
import org.eclipse.jface.databinding.viewers.ViewersObservables;
import org.eclipse.jface.layout.GridDataFactory;
import org.eclipse.jface.layout.GridLayoutFactory;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.Text;

/**
 * Demonstrates binding a TableViewer to a collection.
 */
public class Snippet017TableViewerWithDerivedColumns {
	public static void main(String[] args) {
		final Display display = new Display();

		// Set up data binding. In an RCP application, the threading Realm
		// will be set for you automatically by the Workbench. In an SWT
		// application, you can do this once, wrapping your binding
		// method call.
		Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() {
			public void run() {
				ViewModel viewModel = new ViewModel();
				Shell shell = new View(viewModel).createShell();

				// The SWT event loop
				while (!shell.isDisposed()) {
					if (!display.readAndDispatch()) {
						display.sleep();
					}
				}
			}
		});
	}

	// Minimal JavaBeans support
	public static abstract class AbstractModelObject {
		private PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(
				this);

		public void addPropertyChangeListener(PropertyChangeListener listener) {
			propertyChangeSupport.addPropertyChangeListener(listener);
		}

		public void addPropertyChangeListener(String propertyName,
				PropertyChangeListener listener) {
			propertyChangeSupport.addPropertyChangeListener(propertyName,
					listener);
		}

		public void removePropertyChangeListener(PropertyChangeListener listener) {
			propertyChangeSupport.removePropertyChangeListener(listener);
		}

		public void removePropertyChangeListener(String propertyName,
				PropertyChangeListener listener) {
			propertyChangeSupport.removePropertyChangeListener(propertyName,
					listener);
		}

		protected void firePropertyChange(String propertyName, Object oldValue,
				Object newValue) {
			propertyChangeSupport.firePropertyChange(propertyName, oldValue,
					newValue);
		}
	}

	private static Person UNKNOWN = new Person("unknown", null, null);

	// The data model class. This is normally a persistent class of some sort.
	static class Person extends AbstractModelObject {
		// A property...
		String name = "Donald Duck";
		Person mother;
		Person father;

		public Person(String name, Person mother, Person father) {
			this.name = name;
			this.mother = mother;
			this.father = father;
		}

		public String getName() {
			return name;
		}

		public void setName(String name) {
			String oldValue = this.name;
			this.name = name;
			firePropertyChange("name", oldValue, name);
		}

		public Person getMother() {
			return mother;
		}

		public void setMother(Person mother) {
			firePropertyChange("mother", this.mother, this.mother = mother);
		}

		public Person getFather() {
			return father;
		}

		public void setFather(Person father) {
			firePropertyChange("father", this.father, this.father = father);
		}

		public String toString() {
			return name;
		}
	}

	// The View's model--the root of our Model graph for this particular GUI.
	//
	// Typically each View class has a corresponding ViewModel class.
	// The ViewModel is responsible for getting the objects to edit from the
	// data access tier. Since this snippet doesn't have any persistent objects
	// ro retrieve, this ViewModel just instantiates a model object to edit.
	static class ViewModel {
		// The model to bind
		private IObservableList people = new WritableList();
		{
			Person fergus = new Person("Fergus McDuck", UNKNOWN, UNKNOWN);
			Person downy = new Person("Downy O'Drake", UNKNOWN, UNKNOWN);
			Person scrooge = new Person("Scrooge McDuck", downy, fergus);
			Person hortense = new Person("Hortense McDuck", downy, fergus);
			Person quackmore = new Person("Quackmore Duck", UNKNOWN, UNKNOWN);
			Person della = new Person("Della Duck", hortense, quackmore);
			Person donald = new Person("Donald Duck", hortense, quackmore);
			donald.setFather(quackmore);
			donald.setMother(hortense);
			della.setFather(quackmore);
			della.setMother(hortense);
			hortense.setMother(downy);
			hortense.setFather(fergus);
			scrooge.setMother(downy);
			scrooge.setFather(fergus);
			people.add(UNKNOWN);
			people.add(downy);
			people.add(fergus);
			people.add(scrooge);
			people.add(quackmore);
			people.add(hortense);
			people.add(della);
			people.add(donald);
		}

		public IObservableList getPeople() {
			return people;
		}
	}

	// The GUI view
	static class View {
		private ViewModel viewModel;
		private Table duckFamily;
		private Text nameText;
		private Combo motherCombo;
		private Combo fatherCombo;

		public View(ViewModel viewModel) {
			this.viewModel = viewModel;
		}

		public Shell createShell() {
			// Build a UI
			Display display = Display.getDefault();
			Shell shell = new Shell(display);
			duckFamily = new Table(shell, SWT.BORDER | SWT.FULL_SELECTION);
			duckFamily.setHeaderVisible(true);
			GridDataFactory.defaultsFor(duckFamily).span(2, 1).applyTo(
					duckFamily);
			createColumn("Name");
			createColumn("Mother");
			createColumn("Father");
			createColumn("Grandmother");
			duckFamily.setLinesVisible(true);

			new Label(shell, SWT.NONE).setText("Name:");
			nameText = new Text(shell, SWT.BORDER);
			GridDataFactory.defaultsFor(nameText).grab(true, false).applyTo(
					nameText);

			new Label(shell, SWT.NONE).setText("Mother:");
			motherCombo = new Combo(shell, SWT.READ_ONLY);

			new Label(shell, SWT.NONE).setText("Father:");
			fatherCombo = new Combo(shell, SWT.READ_ONLY);

			DataBindingContext bindingContext = new DataBindingContext();
			bindGUI(bindingContext);

			GridLayoutFactory.swtDefaults().numColumns(2).applyTo(shell);
			// Open and return the Shell
			shell.setSize(500, 300);
			shell.open();
			return shell;
		}

		private void createColumn(String string) {
			final TableColumn column = new TableColumn(duckFamily, SWT.NONE);
			column.setWidth(100);
			column.setText(string);
		}

		protected void bindGUI(DataBindingContext bindingContext) {
			// Since we're using a JFace Viewer, we do first wrap our Table...
			TableViewer peopleViewer = new TableViewer(duckFamily);
			peopleViewer.addFilter(new ViewerFilter() {
				public boolean select(Viewer viewer, Object parentElement,
						Object element) {
					return element != UNKNOWN;
				}
			});

			// Create a standard content provider
			ObservableListContentProvider peopleViewerContentProvider = new ObservableListContentProvider();
			peopleViewer.setContentProvider(peopleViewerContentProvider);

			// And a standard label provider that maps columns
			IObservableMap nameMap = BeansObservables.observeMap(
					peopleViewerContentProvider.getKnownElements(),
					Person.class, "name");
			IObservableMap motherMap = BeansObservables.observeMap(
					peopleViewerContentProvider.getKnownElements(),
					Person.class, "mother");
			IObservableMap fatherMap = BeansObservables.observeMap(
					peopleViewerContentProvider.getKnownElements(),
					Person.class, "father");
			IObservableMap grandmotherMap = new CompositeMap(motherMap,
					BeansObservables.mapFactory(Person.class, "mother"));
			IObservableMap[] columnMaps = new IObservableMap[] {
					nameMap,
					new CompositeMap(motherMap, BeansObservables.mapFactory(
							Person.class, "name")),
					new CompositeMap(fatherMap, BeansObservables.mapFactory(
							Person.class, "name")),
					new CompositeMap(grandmotherMap, BeansObservables.mapFactory(
							Person.class, "name")) };
			peopleViewer.setLabelProvider(new ObservableMapLabelProvider(
					columnMaps));

			// Now set the Viewer's input
			peopleViewer.setInput(viewModel.getPeople());

			IObservableValue selection = ViewersObservables
					.observeSingleSelection(peopleViewer);
			bindingContext
					.bindValue(
							SWTObservables.observeText(nameText, SWT.Modify),
							BeansObservables.observeDetailValue(Realm
									.getDefault(), selection, "name",
									String.class), null, null);

			ComboViewer mothercomboViewer = new ComboViewer(motherCombo);
			ObservableListContentProvider motherComboContentProvider = new ObservableListContentProvider();
			mothercomboViewer.setContentProvider(motherComboContentProvider);
			mothercomboViewer.setLabelProvider(new ObservableMapLabelProvider(
					BeansObservables.observeMap(motherComboContentProvider
							.getKnownElements(), Person.class, "name")));
			mothercomboViewer.setInput(viewModel.getPeople());
			bindingContext.bindValue(ViewersObservables
					.observeSingleSelection(mothercomboViewer),
					BeansObservables.observeDetailValue(Realm.getDefault(),
							selection, "mother", Person.class), null, null);

			ComboViewer fatherComboViewer = new ComboViewer(fatherCombo);
			ObservableListContentProvider fatherComboContentProvider = new ObservableListContentProvider();
			fatherComboViewer
					.setContentProvider(fatherComboContentProvider);
			fatherComboViewer.setLabelProvider(new ObservableMapLabelProvider(
					BeansObservables.observeMap(fatherComboContentProvider
							.getKnownElements(), Person.class, "name")));
			fatherComboViewer.setInput(viewModel.getPeople());
			bindingContext.bindValue(ViewersObservables
					.observeSingleSelection(fatherComboViewer),
					BeansObservables.observeDetailValue(Realm.getDefault(),
							selection, "father", Person.class), null, null);
		}
	}

}