// Based on org.apache.tapestry5.integration.app1.pages.TreeDemo .

package jumpstart.web.pages.examples.component;

import jumpstart.web.models.examples.tree.Stuff;
import jumpstart.web.models.examples.tree.StuffTreeModelAdapter;
import jumpstart.web.pages.Index;

import org.apache.tapestry5.ComponentResources;
import org.apache.tapestry5.ValueEncoder;
import org.apache.tapestry5.annotations.InjectComponent;
import org.apache.tapestry5.corelib.components.Tree;
import org.apache.tapestry5.ioc.annotations.Inject;
import org.apache.tapestry5.tree.DefaultTreeModel;
import org.apache.tapestry5.tree.TreeModel;

public class TreeBrowse {

    // Screen fields
    
    private TreeModel<Stuff> stuffModel;

    // Generally useful bits and pieces

    @InjectComponent
    private Tree tree;

    @Inject
    private ComponentResources componentResources;

    // The code

    void onClearExpansions() {
        tree.clearExpansions();
    }

    // Getters and setters
    
    public TreeModel<Stuff> getStuffModel() {

        if (stuffModel == null) {
            ValueEncoder<Stuff> stuffEncoder = new ValueEncoder<Stuff>() {

                @Override
                public String toClient(Stuff stuff) {
                    return stuff.uuid;
                }

                @Override
                public Stuff toValue(String uuid) {
                    return Stuff.ROOT.searchSubTree(uuid);
                }

            };
            stuffModel = new DefaultTreeModel<Stuff>(stuffEncoder, new StuffTreeModelAdapter(), Stuff.ROOT.children);
        }
        return stuffModel;
    }

    Object onHome() {
        componentResources.discardPersistentFieldChanges();
        return Index.class;
    }
}

.eg {
                margin: 20px 0;
                padding: 14px;
                border: 1px solid #ddd;
                border-radius: 6px;
                -webkit-border-radius: 6px;
                -mox-border-radius: 6px;
}

// Based on org.apache.tapestry5.integration.app1.pages.TreeDemo

package jumpstart.web.models.examples.tree;

import java.util.List;

import org.apache.tapestry5.tree.TreeModelAdapter;

public class StuffTreeModelAdapter implements TreeModelAdapter<Stuff> {

    @Override
    public boolean isLeaf(Stuff stuff) {
        return !hasChildren(stuff);
    }

    @Override
    public boolean hasChildren(Stuff stuff) {
        return stuff.children != null && !stuff.children.isEmpty();
    }

    @Override
    public List<Stuff> getChildren(Stuff stuff) {
        return stuff.children;
    }

    @Override
    public String getLabel(Stuff stuff) {
        return stuff.name;
    }

}

// Based on org.apache.tapestry5.integration.app1.pages.TreeDemo

package jumpstart.web.models.examples.tree;

import java.util.List;
import java.util.UUID;

import org.apache.tapestry5.ioc.internal.util.CollectionFactory;

public class Stuff {

    public static final Stuff ROOT = new Stuff("<root>");

    static {
        ROOT.addChild(new Stuff("Pets").addChildrenNamed("Oscar", "Gromit", "Max", "Roger", "Cooper"));

        ROOT.addChild(new Stuff("Games").addChild(
                new Stuff("Board Games").addChildrenNamed("Settlers of Catan", "Agricola", "Ra", "Risk", "Dvonn"))
                .addChild(new Stuff("Card Games").addChildrenNamed("Magic the Gathering", "Dominion", "Mu")));

        Stuff numbers = new Stuff("Numbers");
        for (int i = 0; i < 10000; i++) {
            numbers.addChild(new Stuff(Integer.toString(i)));
        }
        ROOT.addChild(numbers);
    }

    public final String uuid = UUID.randomUUID().toString();
    public final String name;
    public List<Stuff> children;

    public Stuff(String name) {
        this.name = name;
    }

    public Stuff addChild(Stuff child) {
        if (children == null) {
            children = CollectionFactory.newList();
        }

        children.add(child);

        return this;
    }

    public Stuff addChildrenNamed(String... names) {
        for (String name : names) {
            addChild(new Stuff(name));
        }

        return this;
    }

    public Stuff searchSubTree(String uuid) {

        if (this.uuid.equals(uuid)) {
            return this;
        }

        for (Stuff child : children) {
            Stuff match = child.searchSubTree(uuid);

            if (match != null) {
                return match;
            }
        }

        return null;
    }

}