/*******************************************************************************
 * Copyright (c) 2008 Matthew Hall 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:
 *     Matthew Hall - initial API and implementation (bug 124684)
 *     Matthew Hall - bugs 260329, 260337
 ******************************************************************************/

module org.eclipse.jface.examples.databinding.snippets.Snippet018CheckboxTableViewerCheckedSelection;

import java.lang.all;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.beans.BeanProperties;
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.value.ComputedValue;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.jface.databinding.viewers.ViewerSupport;
import org.eclipse.jface.databinding.viewers.ViewersObservables;
import org.eclipse.jface.dialogs.IInputValidator;
import org.eclipse.jface.dialogs.InputDialog;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.layout.GridDataFactory;
import org.eclipse.jface.layout.GridLayoutFactory;
import org.eclipse.jface.layout.TableColumnLayout;
import org.eclipse.jface.viewers.CheckboxTableViewer;
import org.eclipse.jface.viewers.ColumnWeightData;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.Text;

/**
 * Snippet 018: Binding to the checked elements in a CheckboxTableViewer.
 */
public class Snippet018CheckboxTableViewerCheckedSelection {
    public static void main(String[] args) {
        // The SWT event loop
        final Display display = Display.getDefault();
        Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() {
            public void run() {
                ViewModel viewModel = createSampleModel();

                Shell shell = new View(viewModel).createShell();
                shell.open();
                while (!shell.isDisposed())
                    if (!display.readAndDispatch())
                        display.sleep();
            }
        });
        display.dispose();
    }

    private static ViewModel createSampleModel() {
        ViewModel viewModel = new ViewModel();

        Person stan = createPerson("Stan");
        Person kyle = createPerson("Kyle");
        Person eric = createPerson("Eric");
        Person kenny = createPerson("Kenny");
        Person wendy = createPerson("Wendy");
        Person butters = createPerson("Butters");

        setFriends(stan, new Person[] { kyle, eric, kenny, wendy });
        setFriends(kyle, new Person[] { stan, eric, kenny });
        setFriends(eric, new Person[] { eric });
        setFriends(kenny, new Person[] { stan, kyle, eric });
        setFriends(wendy, new Person[] { stan });
        setFriends(butters, new Person[0]);

        Person[] people = new Person[] { stan, kyle, eric, kenny, wendy,
                butters };
        viewModel.setPeople(Arrays.asList(people));
        return viewModel;
    }

    private static Person createPerson(String name) {
        Person person = new Person();
        person.setName(name);
        return person;
    }

    private static void setFriends(Person person, Person[] friends) {
        person.setFriends(new HashSet(Arrays.asList(friends)));
    }

    // 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);
        }
    }

    // The data model class.
    static class Person extends AbstractModelObject {
        private String name;
        private Set friends = new HashSet();

        public String getName() {
            return name;
        }

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

        public Set getFriends() {
            return new HashSet(friends);
        }

        public void setFriends(Set friends) {
            firePropertyChange("friends", this.friends,
                    this.friends = new HashSet(friends));
        }

        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
    // to retrieve, this ViewModel just instantiates a model object to edit.
    static class ViewModel extends AbstractModelObject {
        private List people = new ArrayList();

        public List getPeople() {
            return new ArrayList(people);
        }

        public void setPeople(List people) {
            firePropertyChange("people", this.people,
                    this.people = new ArrayList(people));
        }
    }

    // The GUI view
    static class View {
        private ViewModel viewModel;

        private Shell shell;

        private Button addPersonButton;
        private Button removePersonButton;
        private TableViewer peopleViewer;
        private Text personName;
        private CheckboxTableViewer friendsViewer;

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

        public Shell createShell() {
            // Build a UI
            final Display display = Display.getCurrent();
            shell = new Shell(display);

            createUI(shell);

            // Bind UI
            bindUI();

            // Open and return the Shell
            shell.setSize(shell.computeSize(400, SWT.DEFAULT));
            shell.open();
            return shell;
        }

        private void createUI(Shell shell) {
            shell.setText("Binding checked elements in CheckboxTableViewer");
            shell.setLayout(new GridLayout(2, false));

            new Label(shell, SWT.NONE).setText("People");

            Composite buttons = new Composite(shell, SWT.NONE);
            GridDataFactory.swtDefaults().align(SWT.RIGHT, SWT.CENTER).applyTo(
                    buttons);
            GridLayoutFactory.fillDefaults().numColumns(2).equalWidth(true)
                    .applyTo(buttons);
            addPersonButton = new Button(buttons, SWT.PUSH);
            addPersonButton.setText("Add");
            GridDataFactory.fillDefaults().applyTo(addPersonButton);
            removePersonButton = new Button(buttons, SWT.PUSH);
            removePersonButton.setText("Remove");
            GridDataFactory.fillDefaults().applyTo(removePersonButton);

            Composite peopleComposite = new Composite(shell, SWT.NONE);
            GridDataFactory.fillDefaults().grab(true, true).span(2, 1).applyTo(
                    peopleComposite);
            TableColumnLayout peopleColumnLayout = new TableColumnLayout();
            peopleComposite.setLayout(peopleColumnLayout);

            peopleViewer = new TableViewer(peopleComposite, SWT.SINGLE
                    | SWT.BORDER | SWT.FULL_SELECTION);

            Table peopleTable = peopleViewer.getTable();
            peopleTable.setHeaderVisible(true);
            peopleTable.setLinesVisible(true);

            TableColumn nameColumn = new TableColumn(peopleTable, SWT.NONE);
            nameColumn.setText("Name");
            peopleColumnLayout.setColumnData(nameColumn,
                    new ColumnWeightData(1));

            TableColumn friendsColumn = new TableColumn(peopleTable, SWT.NONE);
            friendsColumn.setText("Friends");
            peopleColumnLayout.setColumnData(friendsColumn,
                    new ColumnWeightData(3));

            new Label(shell, SWT.NONE).setText("Name");

            personName = new Text(shell, SWT.BORDER);
            GridDataFactory.fillDefaults().grab(true, false)
                    .applyTo(personName);

            new Label(shell, SWT.NONE).setText("Friends");

            Composite friendsComposite = new Composite(shell, SWT.NONE);
            GridDataFactory.fillDefaults().grab(true, true).applyTo(
                    friendsComposite);
            TableColumnLayout friendsColumnLayout = new TableColumnLayout();
            friendsComposite.setLayout(friendsColumnLayout);

            friendsViewer = CheckboxTableViewer.newCheckList(friendsComposite,
                    SWT.SINGLE | SWT.BORDER | SWT.FULL_SELECTION);

            Table friendsTable = friendsViewer.getTable();
            friendsTable.setHeaderVisible(true);
            friendsTable.setLinesVisible(true);
            TableColumn friendNameColumn = new TableColumn(friendsTable,
                    SWT.NONE);
            friendNameColumn.setText("Name");
            friendsColumnLayout.setColumnData(friendNameColumn,
                    new ColumnWeightData(1));

            GridDataFactory.fillDefaults().grab(true, true).applyTo(
                    friendsViewer.getTable());
        }

        private void bindUI() {
            DataBindingContext dbc = new DataBindingContext();

            final IObservableList people = BeansObservables.observeList(Realm
                    .getDefault(), viewModel, "people");

            addPersonButton.addListener(SWT.Selection, new Listener() {
                public void handleEvent(Event event) {
                    InputDialog dlg = new InputDialog(shell, "Add Person",
                            "Enter name:", "<Name>", new IInputValidator() {
                                public String isValid(String newText) {
                                    if (newText == null
                                            || newText.length() == 0)
                                        return "Name cannot be empty";
                                    return null;
                                }
                            });
                    if (dlg.open() == Window.OK) {
                        Person person = new Person();
                        person.setName(dlg.getValue());
                        people.add(person);
                        peopleViewer.setSelection(new StructuredSelection(
                                person));
                    }
                }
            });

            removePersonButton.addListener(SWT.Selection, new Listener() {
                public void handleEvent(Event event) {
                    IStructuredSelection selected = (IStructuredSelection) peopleViewer
                            .getSelection();
                    if (selected.isEmpty())
                        return;
                    Person person = (Person) selected.getFirstElement();
                    if (MessageDialog.openConfirm(shell, "Remove person",
                            "Remove " + person.getName() + "?"))
                        people.remove(person);
                }
            });

            ViewerSupport.bind(peopleViewer, people, BeanProperties.values(
                    Person.class, new String[] { "name", "friends" }));

            final IObservableValue selectedPerson = ViewersObservables
                    .observeSingleSelection(peopleViewer);

            IObservableValue personSelected = new ComputedValue(bool.TYPE) {
                protected Object calculate() {
                    return bool.valueOf(selectedPerson.getValue() != null);
                }
            };
            dbc.bindValue(SWTObservables.observeEnabled(removePersonButton),
                    personSelected);
            dbc.bindValue(SWTObservables.observeEnabled(friendsViewer
                    .getTable()), personSelected);

            dbc.bindValue(SWTObservables.observeText(personName, SWT.Modify),
                    BeansObservables.observeDetailValue(selectedPerson, "name",
                            String.class));

            ViewerSupport.bind(friendsViewer, people, BeanProperties.value(
                    Person.class, "name"));

            dbc.bindSet(ViewersObservables.observeCheckedElements(
                    friendsViewer, Person.class), BeansObservables
                    .observeDetailSet(selectedPerson, "friends", Person.class));
        }
    }
}
void main( String[] args ){
    Snippet018CheckboxTableViewerCheckedSelection.main(args);
}