wicketdnd.examples.TreeExample.java Source code

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Here is the source code for wicketdnd.examples.TreeExample.java

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/*
 * Copyright 2009 Sven Meier
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package wicketdnd.examples;

import java.util.Set;

import org.apache.wicket.Component;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.extensions.markup.html.repeater.tree.AbstractTree.State;
import org.apache.wicket.extensions.markup.html.repeater.tree.DefaultNestedTree;
import org.apache.wicket.extensions.markup.html.repeater.tree.NestedTree;
import org.apache.wicket.model.IModel;

import wicketdnd.DragSource;
import wicketdnd.DropTarget;
import wicketdnd.Location;
import wicketdnd.Operation;
import wicketdnd.Reject;
import wicketdnd.Transfer;

/**
 * @author Sven Meier
 */
public class TreeExample extends Example {
    public TreeExample(String id) {
        super(id);

        final FooTreeProvider provider = new FooTreeProvider();
        final NestedTree<Foo> tree = new DefaultNestedTree<Foo>("tree", provider) {
            @Override
            protected Component newContentComponent(String arg0, IModel<Foo> arg1) {
                Component component = super.newContentComponent(arg0, arg1);
                component.setOutputMarkupId(true);
                return component;
            }
        };
        tree.add(new DragSource() {
            @Override
            public Set<Operation> getOperations() {
                return dragOperations();
            }

            @Override
            public String[] getTypes() {
                return types();
            }

            @Override
            public void onAfterDrop(AjaxRequestTarget target, Transfer transfer) {
                if (transfer.getOperation() == Operation.MOVE) {
                    Foo foo = transfer.getData();

                    provider.remove(foo);

                    foo.remove();

                    target.add(tree);
                }
            }
        }.drag("span.tree-content"));
        tree.add(new DropTarget() {
            @Override
            public Set<Operation> getOperations() {
                return dropOperations();
            }

            @Override
            public String[] getTypes() {
                return types();
            }

            @Override
            public void onDrag(AjaxRequestTarget target, Location location) {
                if (location.getComponent() != tree) {
                    Foo foo = location.getModelObject();
                    if (tree.getState(foo) == State.COLLAPSED) {
                        tree.expand(foo);
                    }
                }
            }

            @Override
            public void onDrop(AjaxRequestTarget target, Transfer transfer, Location location) throws Reject {
                if (location.getComponent() == tree) {
                    provider.add(operate(transfer));
                } else {
                    Foo foo = location.getModelObject();
                    if (foo.isAncestor(transfer.getData())) {
                        transfer.reject();
                    }

                    switch (location.getAnchor()) {
                    case CENTER:
                        if (foo == transfer.getData()) {
                            transfer.reject();
                        }
                        provider.add(operate(transfer), foo);

                        tree.expand(foo);
                        break;
                    case TOP:
                        provider.addBefore(operate(transfer), foo);
                        break;
                    case BOTTOM:
                        provider.addAfter(operate(transfer), foo);
                        break;
                    default:
                        transfer.reject();
                    }
                }
                target.add(tree);
            }
        }.dropCenter("span.tree-content, div.treeContainer").dropTopAndBottom("div.tree-branch"));
        tree.setOutputMarkupId(true);
        content.add(tree);
    }
}