/*
* Copyright 2011 JBoss Inc
*
* 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 org.jbpm.formbuilder.client.tree;
import org.jbpm.formapi.client.CommonGlobals;
import org.jbpm.formapi.client.form.FBCompositeItem;
import org.jbpm.formapi.client.form.FBFormItem;
import org.jbpm.formbuilder.client.bus.ui.FormItemAddedEvent;
import org.jbpm.formbuilder.client.bus.ui.FormItemAddedHandler;
import org.jbpm.formbuilder.client.bus.ui.FormItemRemovedEvent;
import org.jbpm.formbuilder.client.bus.ui.FormItemRemovedHandler;
import com.google.gwt.event.shared.EventBus;
import com.google.gwt.user.client.ui.Widget;
/**
* Tree presenter. Handles notifications of form items added and removed
* and tells the view to update itself
*/
public class TreePresenter implements TreeView.Presenter {
private final TreeView view;
private final EventBus bus = CommonGlobals.getInstance().getEventBus();
public TreePresenter(TreeView treeView) {
this.view = treeView;
bus.addHandler(FormItemRemovedEvent.TYPE, new FormItemRemovedHandler() {
@Override
public void onEvent(FormItemRemovedEvent event) {
FBFormItem item = event.getFormItem();
view.removeFormItem(item);
}
});
bus.addHandler(FormItemAddedEvent.TYPE, new FormItemAddedHandler() {
@Override
public void onEvent(FormItemAddedEvent event) {
FBFormItem item = event.getFormItem();
Widget parent = event.getFormItemHolder();
FBCompositeItem parentItem = null;
while (parent != null && parentItem == null) {
if (parent instanceof FBCompositeItem) {
parentItem = (FBCompositeItem) parent;
} else {
parent = parent.getParent();
}
}
view.addFormItem(item, parentItem);
}
});
}
}