Fast tree (Ext GWT)
/*
* Ext GWT - Ext for GWT
* Copyright(c) 2007-2009, Ext JS, LLC.
* licensing@extjs.com
*
* http://extjs.com/license
*/
package com.google.gwt.sample.hello.client;
import java.util.ArrayList;
import java.util.List;
import com.extjs.gxt.ui.client.data.BaseModelData;
import com.extjs.gxt.ui.client.data.ModelData;
import com.extjs.gxt.ui.client.data.ModelKeyProvider;
import com.extjs.gxt.ui.client.event.Events;
import com.extjs.gxt.ui.client.event.Listener;
import com.extjs.gxt.ui.client.event.TreePanelEvent;
import com.extjs.gxt.ui.client.store.TreeStore;
import com.extjs.gxt.ui.client.widget.Html;
import com.extjs.gxt.ui.client.widget.LayoutContainer;
import com.extjs.gxt.ui.client.widget.layout.FitLayout;
import com.extjs.gxt.ui.client.widget.layout.FlowLayout;
import com.extjs.gxt.ui.client.widget.treepanel.TreePanel;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.ui.RootPanel;
public class Hello implements EntryPoint {
public void onModuleLoad() {
RootPanel.get().add(new FastTreePanelExample());
}
}
class FastTreePanelExample extends LayoutContainer {
private int counter = 0;
@Override
protected void onRender(Element parent, int index) {
super.onRender(parent, index);
setLayout(new FlowLayout(12));
final Html html = new Html("This tree is handling 1 child. Expand to get more!");
html.setStyleName("pad-text");
LayoutContainer container = new LayoutContainer();
container.setSize(300, 350);
container.setBorders(true);
container.setLayout(new FitLayout());
TreeStore<ModelData> store = new TreeStore<ModelData>();
final TreePanel<ModelData> tree = new TreePanel<ModelData>(store);
tree.setTrackMouseOver(false);
tree.setDisplayProperty("name");
store.setKeyProvider(new ModelKeyProvider<ModelData>() {
public String getKey(ModelData model) {
return model.get("id");
}
});
ModelData m = createModel("Fast Tree");
store.add(m, false);
tree.setLeaf(m, false);
tree.addListener(Events.BeforeExpand, new Listener<TreePanelEvent<ModelData>>() {
public void handleEvent(TreePanelEvent<ModelData> be) {
if (be.getNode().getItemCount() != 0) {
return;
}
List<ModelData> list = new ArrayList<ModelData>();
for (int i = 0; i < 500; i++) {
ModelData m = createModel("Tree Item " + i);
list.add(m);
}
tree.getStore().insert(be.getNode().getModel(), list, 0, true);
for (ModelData m : list) {
tree.setLeaf(m, false);
}
}
});
tree.addListener(Events.Expand, new Listener<TreePanelEvent<ModelData>>() {
public void handleEvent(TreePanelEvent<ModelData> be) {
html.setHtml("<span>This tree is handling " + tree.getStore().getAllItems().size()
+ " children. Expand to get more!</span>");
}
});
add(html);
container.add(tree);
add(container);
}
private ModelData createModel(String n) {
ModelData m = new BaseModelData();
m.set("name", n);
m.set("id", String.valueOf(counter++));
return m;
}
}
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