Using BufferView to create buffered grid (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.io.Serializable;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import com.extjs.gxt.ui.client.Style.SortDir;
import com.extjs.gxt.ui.client.data.BasePagingLoadConfig;
import com.extjs.gxt.ui.client.data.BasePagingLoader;
import com.extjs.gxt.ui.client.data.BaseTreeModel;
import com.extjs.gxt.ui.client.data.DataField;
import com.extjs.gxt.ui.client.data.JsonPagingLoadResultReader;
import com.extjs.gxt.ui.client.data.LoadEvent;
import com.extjs.gxt.ui.client.data.Loader;
import com.extjs.gxt.ui.client.data.ModelData;
import com.extjs.gxt.ui.client.data.ModelType;
import com.extjs.gxt.ui.client.data.PagingLoadResult;
import com.extjs.gxt.ui.client.data.PagingLoader;
import com.extjs.gxt.ui.client.data.ScriptTagProxy;
import com.extjs.gxt.ui.client.event.Events;
import com.extjs.gxt.ui.client.event.GridEvent;
import com.extjs.gxt.ui.client.event.Listener;
import com.extjs.gxt.ui.client.store.ListStore;
import com.extjs.gxt.ui.client.widget.ContentPanel;
import com.extjs.gxt.ui.client.widget.LayoutContainer;
import com.extjs.gxt.ui.client.widget.grid.BufferView;
import com.extjs.gxt.ui.client.widget.grid.ColumnConfig;
import com.extjs.gxt.ui.client.widget.grid.ColumnData;
import com.extjs.gxt.ui.client.widget.grid.ColumnModel;
import com.extjs.gxt.ui.client.widget.grid.Grid;
import com.extjs.gxt.ui.client.widget.grid.GridCellRenderer;
import com.extjs.gxt.ui.client.widget.grid.RowNumberer;
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.toolbar.PagingToolBar;
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 BufferedGridExample());
}
}
class BufferedGridExample extends LayoutContainer {
@Override
protected void onRender(Element parent, int index) {
super.onRender(parent, index);
FlowLayout layout = new FlowLayout(10);
setLayout(layout);
String url = "http://www.extjs.com/forum/topics-browse-remote.php";
ScriptTagProxy<PagingLoadResult<ModelData>> proxy = new ScriptTagProxy<PagingLoadResult<ModelData>>(url);
ModelType type = new ModelType();
type.setRoot("topics");
type.setTotalName("totalCount");
type.addField("title");
type.addField("forumtitle");
type.addField("forumid");
type.addField("author");
type.addField("replycount");
type.addField("lastposter");
type.addField("excerpt");
type.addField("replycount");
type.addField("threadid");
DataField datefield = new DataField("lastpost");
datefield.setType(Date.class);
datefield.setFormat("timestamp");
type.addField(datefield);
JsonPagingLoadResultReader<PagingLoadResult<ModelData>> reader = new JsonPagingLoadResultReader<PagingLoadResult<ModelData>>(
type);
final PagingLoader<PagingLoadResult<ModelData>> loader = new BasePagingLoader<PagingLoadResult<ModelData>>(proxy,
reader);
loader.addListener(Loader.BeforeLoad, new Listener<LoadEvent>() {
public void handleEvent(LoadEvent be) {
BasePagingLoadConfig m = be.<BasePagingLoadConfig> getConfig();
m.set("start", m.get("offset"));
m.set("ext", "js");
m.set("lightWeight", true);
m.set("sort", (m.get("sortField") == null) ? "" : m.get("sortField"));
m.set("dir", (m.get("sortDir") == null || (m.get("sortDir") != null && m.<SortDir> get("sortDir").equals(
SortDir.NONE))) ? "" : m.get("sortDir"));
}
});
loader.setSortDir(SortDir.DESC);
loader.setSortField("lastpost");
loader.setRemoteSort(true);
ListStore<ModelData> store = new ListStore<ModelData>(loader);
final PagingToolBar toolBar = new PagingToolBar(500);
toolBar.bind(loader);
List<ColumnConfig> columns = new ArrayList<ColumnConfig>();
RowNumberer rn = new RowNumberer();
rn.setWidth(30);
columns.add(rn);
ColumnConfig title = new ColumnConfig("title", "Topic", 100);
title.setRenderer(new GridCellRenderer<ModelData>() {
public Object render(ModelData model, String property, ColumnData config, int rowIndex, int colIndex,
ListStore<ModelData> store, Grid<ModelData> grid) {
return "<b><a style=\"color: #385F95; text-decoration: none;\" href=\"http://extjs.com/forum/showthread.php?t="
+ model.get("threadid")
+ "\" target=\"_blank\">"
+ model.get("title")
+ "</a></b><br /><a style=\"color: #385F95; text-decoration: none;\" href=\"http://extjs.com/forum/forumdisplay.php?f="
+ model.get("forumid") + "\" target=\"_blank\">" + model.get("forumtitle") + " Forum</a>";
}
});
columns.add(title);
columns.add(new ColumnConfig("replycount", "Replies", 50));
ColumnConfig last = new ColumnConfig("lastpost", "Last Post", 200);
last.setRenderer(new GridCellRenderer<ModelData>() {
public Object render(ModelData model, String property, ColumnData config, int rowIndex, int colIndex,
ListStore<ModelData> store, Grid<ModelData> grid) {
return model.get("lastpost") + "<br/>by " + model.get("lastposter");
}
});
columns.add(last);
ColumnModel cm = new ColumnModel(columns);
Grid<ModelData> grid = new Grid<ModelData>(store, cm);
grid.setTrackMouseOver(false);
grid.addListener(Events.Attach, new Listener<GridEvent<Post>>() {
public void handleEvent(GridEvent<Post> be) {
loader.load(0, 500);
}
});
grid.setTrackMouseOver(false);
grid.setLoadMask(true);
grid.setBorders(true);
grid.setAutoExpandColumn("title");
BufferView view = new BufferView();
view.setRowHeight(32);
grid.setView(view);
ContentPanel panel = new ContentPanel();
panel.setFrame(true);
panel.setCollapsible(true);
panel.setAnimCollapse(false);
//panel.setIcon(Resources.ICONS.table());
panel.setHeading("Buffered Grid");
panel.setLayout(new FitLayout());
panel.add(grid);
panel.setSize(600, 350);
panel.setBottomComponent(toolBar);
add(panel);
}
}
class Post extends BaseTreeModel implements Serializable {
protected Date dummy;
public Post() {
}
public String getUsername() {
return (String) get("username");
}
public void setUsername(String username) {
set("username", username);
}
public String getForum() {
return (String) get("forum");
}
public void setForum(String forum) {
set("forum", forum);
}
public Date getDate() {
return (Date) get("date");
}
public void setDate(Date date) {
set("date", date);
}
public String getSubject() {
return (String) get("subject");
}
public void setSubject(String subject) {
set("subject", subject);
}
}
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