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MillerColumns

A Miller Columns widget for displaying hierarchial data

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The MillerColumns component provides an alternative for displaying hierarchial data, which is usually displayed by using a Tree component. This component extends Tree on the server-side. Client-side uses a different implementation. The component supports the same features as Tree.

Sample code

package com.example.millercolumns;

import org.vaadin.hene.millercolumns.MillerColumns;

import com.vaadin.Application;
import com.vaadin.data.util.HierarchicalContainer;
import com.vaadin.event.Action;
import com.vaadin.ui.Window;

public class MillerColumnsApplication extends Application implements
                Action.Handler {

        private static final long serialVersionUID = 1L;

        private static Action DELETE_ACTION = new Action("Delete");

        private static Action RENAME_ACTION = new Action("Rename");

        private MillerColumns millerColumns;

        @Override
        public void init() {
                Window mainWindow = new Window("MillerColumns Application");
                setMainWindow(mainWindow);

                millerColumns = new MillerColumns();
                millerColumns.setContainerDataSource(createFakeFileSystemContainer());
                millerColumns.addActionHandler(this);
                mainWindow.addComponent(millerColumns);

        }

        private static HierarchicalContainer createFakeFileSystemContainer() {
                HierarchicalContainer cont = new HierarchicalContainer();
                cont.addItem("Applications");
                cont.addItem("Firefox.app");
                cont.setParent("Firefox.app", "Applications");
                cont.setChildrenAllowed("Firefox.app", false);
                cont.addItem("Opera.app");
                cont.setParent("Opera.app", "Applications");
                cont.setChildrenAllowed("Opera.app", false);
                cont.addItem("Safari.app");
                cont.setParent("Safari.app", "Applications");
                cont.setChildrenAllowed("Safari.app", false);
                cont.addItem("Library");
                cont.addItem("Users");
                cont.addItem("lisa");
                cont.setParent("lisa", "Users");
                cont.addItem("tim");
                cont.setParent("tim", "Users");
                return cont;
        }

        public Action[] getActions(Object target, Object sender) {
                return new Action[] { RENAME_ACTION, DELETE_ACTION };
        }

        public void handleAction(Action action, Object sender, Object target) {
                if (RENAME_ACTION == action) {

                } else if (DELETE_ACTION == action) {
                        millerColumns.removeItem(target);
                }
        }

}

Links

• Forum discussion
• Miller Columns at Wikipedia
• Source codes
• Demo

Compatibility