PagingGridExample.java

/*
 * Ext GWT - Ext for GWT
 * Copyright(c) 2007-2009, Ext JS, LLC.
 * licensing@extjs.com
 * 
 * http://extjs.com/license
 */
package com.extjs.gxt.samples.client.examples.grid;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import com.extjs.gxt.samples.client.ExampleServiceAsync;
import com.extjs.gxt.samples.client.Examples;
import com.extjs.gxt.samples.client.examples.model.Post;
import com.extjs.gxt.samples.resources.client.Resources;
import com.extjs.gxt.ui.client.Registry;
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.ModelData;
import com.extjs.gxt.ui.client.data.PagingLoadConfig;
import com.extjs.gxt.ui.client.data.PagingLoadResult;
import com.extjs.gxt.ui.client.data.PagingLoader;
import com.extjs.gxt.ui.client.data.RpcProxy;
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.ColumnConfig;
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.layout.FitLayout;
import com.extjs.gxt.ui.client.widget.layout.FlowLayout;
import com.extjs.gxt.ui.client.widget.toolbar.PagingToolBar;
import com.google.gwt.i18n.client.DateTimeFormat;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.rpc.AsyncCallback;

public class PagingGridExample extends LayoutContainer {

  @Override
  protected void onRender(Element parent, int index) {
    super.onRender(parent, index);

    final ExampleServiceAsync service = (ExampleServiceAsync) Registry.get(Examples.SERVICE);

    FlowLayout layout = new FlowLayout(10);
    setLayout(layout);

    RpcProxy<PagingLoadResult<Post>> proxy = new RpcProxy<PagingLoadResult<Post>>() {
      @Override
      public void load(Object loadConfig, AsyncCallback<PagingLoadResult<Post>> callback) {
        service.getPosts((PagingLoadConfig) loadConfig, callback);
      }
    };

    // loader
    final PagingLoader<PagingLoadResult<ModelData>> loader = new BasePagingLoader<PagingLoadResult<ModelData>>(
        proxy);
    loader.setRemoteSort(true);

    ListStore<Post> store = new ListStore<Post>(loader);

    final PagingToolBar toolBar = new PagingToolBar(50);
    toolBar.bind(loader);

    List<ColumnConfig> columns = new ArrayList<ColumnConfig>();
    columns.add(new ColumnConfig("forum", "Forum", 150));
    columns.add(new ColumnConfig("username", "Username", 100));
    columns.add(new ColumnConfig("subject", "Subject", 200));
    ColumnConfig date = new ColumnConfig("date", "Date", 100);
    date.setDateTimeFormat(DateTimeFormat.getFormat("MM/dd/y"));
    columns.add(date);

    ColumnModel cm = new ColumnModel(columns);

    final Grid<Post> grid = new Grid<Post>(store, cm);
    grid.setStateId("pagingGridExample");
    grid.setStateful(true);
    grid.addListener(Events.Attach, new Listener<GridEvent<Post>>() {
      public void handleEvent(GridEvent<Post> be) {
        PagingLoadConfig config = new BasePagingLoadConfig();
        config.setOffset(0);
        config.setLimit(50);
        
        Map<String, Object> state = grid.getState();
        if (state.containsKey("offset")) {
          int offset = (Integer)state.get("offset");
          int limit = (Integer)state.get("limit");
          config.setOffset(offset);
          config.setLimit(limit);
        }
        if (state.containsKey("sortField")) {
          config.setSortField((String)state.get("sortField"));
          config.setSortDir(SortDir.valueOf((String)state.get("sortDir")));
        }
        loader.load(config);
      }
    });
    grid.setLoadMask(true);
    grid.setBorders(true);
    grid.setAutoExpandColumn("forum");

    ContentPanel panel = new ContentPanel();
    panel.setFrame(true);
    panel.setCollapsible(true);
    panel.setAnimCollapse(false);
    panel.setIcon(Resources.ICONS.table());
    panel.setHeading("Paging Grid");
    panel.setLayout(new FitLayout());
    panel.add(grid);
    panel.setSize(600, 350);
    panel.setBottomComponent(toolBar);

    add(panel);
  }

}