package com.sencha.gxt.explorer.client.dnd;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.ui.IsWidget;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Widget;
import com.sencha.gxt.data.shared.TreeStore;
import com.sencha.gxt.dnd.core.client.DndDragStartEvent;
import com.sencha.gxt.dnd.core.client.TreeDropTarget;
import com.sencha.gxt.dnd.core.client.DND.Feedback;
import com.sencha.gxt.dnd.core.client.DndDragStartEvent.DndDragStartHandler;
import com.sencha.gxt.dnd.core.client.TreeDragSource;
import com.sencha.gxt.examples.resources.client.images.ExampleImages;
import com.sencha.gxt.examples.resources.client.model.BaseDtoProperties;
import com.sencha.gxt.explorer.client.model.Example.Detail;
import com.sencha.gxt.explorer.client.model.ExampleModel;
import com.sencha.gxt.explorer.client.model.NamedModel;
import com.sencha.gxt.explorer.client.model.NamedModel.NamedModelProperties;
import com.sencha.gxt.widget.core.client.FramedPanel;
import com.sencha.gxt.widget.core.client.tree.Tree;

public class ReorderingTreeExample implements EntryPoint, IsWidget {

@Override
  public Widget asWidget() {
    ExampleModel examples = GWT.create(ExampleModel.class);
    NamedModelProperties props = GWT.create(NamedModelProperties.class);
    
    final TreeStore<NamedModel> sourceStore = new TreeStore<NamedModel>(props.kp());
    sourceStore.addSubTree(0, examples.getModels());

final Tree<NamedModel, String> sourceTree = new Tree<NamedModel, String>(sourceStore, props.name());
    sourceTree.getStyle().setLeafIcon(ExampleImages.INSTANCE.text());
    sourceTree.setBorders(true);
    sourceTree.getElement().getStyle().setBackgroundColor("white");

TreeDragSource<NamedModel> source = new TreeDragSource<NamedModel>(sourceTree);
    source.addDragStartHandler(new DndDragStartHandler() {
      
      @Override
      public void onDragStart(DndDragStartEvent event) {
        NamedModel sel = sourceTree.getSelectionModel().getSelectedItem();
        if (sel != null && sel == sourceStore.getRootItems().get(0)) {
          event.setCancelled(true);
          event.getStatusProxy().setStatus(false);
        }
      }
    });
    
    TreeDropTarget<NamedModel> target = new TreeDropTarget<NamedModel>(sourceTree);
    target.setAllowSelfAsSource(true);
    target.setFeedback(Feedback.BOTH);

FramedPanel panel = new FramedPanel();
    panel.setHeadingText("Reordering Tree");
    panel.addStyleName("margin-10");
    panel.setPixelSize(320, 420);
    panel.setWidget(sourceTree);

return panel;
  }

@Override
  public void onModuleLoad() {
    RootPanel.get().add(this);
  }

}