/*******************************************************************************
 * Copyright (c) 2008 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 ******************************************************************************/

module org.eclipse.jface.examples.databinding.snippets.Snippet022ComputedListCombo;

import java.lang.all;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.core.databinding.observable.list.ComputedList;
import org.eclipse.core.databinding.observable.list.IObservableList;
import org.eclipse.core.databinding.observable.list.WritableList;
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.layout.GridDataFactory;
import org.eclipse.jface.layout.GridLayoutFactory;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Shell;

/**
 * @since 3.2
 * 
 */
public class Snippet022ComputedListCombo {
    private static WritableList model;

    public static void main(String[] args) {
        Display display = new Display();
        final Shell shell = new Shell(display);
        shell.setLayout(new GridLayout(1, false));

        Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() {
            public void run() {
                Snippet022ComputedListCombo snippet = new Snippet022ComputedListCombo();
                snippet.createModel();
                snippet.createControls(shell);
            }
        });

        shell.pack();
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }

    /**
     * 
     */
    protected void createModel() {
        model = new WritableList();
        model.add(new Thing("Alice", true, false));
        model.add(new Thing("Beth", true, false));
        model.add(new Thing("Cathy", true, false));
        model.add(new Thing("Arthur", false, true));
        model.add(new Thing("Bob", false, true));
        model.add(new Thing("Curtis", false, true));
        model.add(new Thing("Snail", true, true));
        model.add(new Thing("Nail", false, false));
    }

    /**
     * @param shell
     */
    protected void createControls(Shell shell) {
        Composite composite = new Composite(shell, SWT.NONE);
        Group group = new Group(composite, SWT.NONE);
        group.setText("Filter");
        Button male = new Button(group, SWT.CHECK);
        male.setText("Male");
        Button female = new Button(group, SWT.CHECK);
        female.setText("Female");
        final IObservableValue femaleObservable = SWTObservables
                .observeSelection(female);
        final IObservableValue maleObservable = SWTObservables
                .observeSelection(male);
        Combo combo = new Combo(composite, SWT.DROP_DOWN | SWT.READ_ONLY);
        GridDataFactory.defaultsFor(combo).align(SWT.BEGINNING, SWT.BEGINNING)
                .applyTo(combo);
        ComboViewer viewer = new ComboViewer(combo);
        viewer.setContentProvider(new ObservableListContentProvider());
        // We should really have an out-of-the box filtered list...
        IObservableList filteredList = new ComputedList() {
            protected List calculate() {
                ArrayList result = new ArrayList();
                for (Iterator it = model.iterator(); it.hasNext();) {
                    Thing thing = (Thing) it.next();
                    if (((bool) femaleObservable.getValue()).booleanValue()
                            && !thing.female)
                        continue;
                    if (((bool) maleObservable.getValue()).booleanValue()
                            && !thing.male)
                        continue;
                    result.add(thing);
                }
                return result;
            }
        };
        viewer.setInput(filteredList);
        GridLayoutFactory.swtDefaults().applyTo(group);
        GridLayoutFactory.swtDefaults().applyTo(composite);
    }

    static class Thing {
        String name;
        bool male;
        bool female;

        public Thing(String name, bool female, bool male) {
            this.name = name;
            this.female = female;
            this.male = male;
        }

        public String toString() {
            return name;
        }
    }
}
void main( String[] args ){
    Snippet022ComputedListCombo.main(args);
}