DataSource driven widgets. (Smart GWT) : DataSource « GWT « Java






DataSource driven widgets. (Smart GWT)

DataSource driven widgets. (Smart GWT)
   
/*
 * SmartGWT (GWT for SmartClient)
 * Copyright 2008 and beyond, Isomorphic Software, Inc.
 *
 * SmartGWT is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version 3
 * as published by the Free Software Foundation.  SmartGWT is also
 * available under typical commercial license terms - see
 * http://smartclient.com/license
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 */

package com.smartgwt.sample.showcase.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.RootPanel;
import com.smartgwt.client.data.DataSource;
import com.smartgwt.client.data.fields.DataSourceBooleanField;
import com.smartgwt.client.data.fields.DataSourceDateField;
import com.smartgwt.client.data.fields.DataSourceEnumField;
import com.smartgwt.client.data.fields.DataSourceFloatField;
import com.smartgwt.client.data.fields.DataSourceIntegerField;
import com.smartgwt.client.data.fields.DataSourceLinkField;
import com.smartgwt.client.data.fields.DataSourceTextField;
import com.smartgwt.client.types.Alignment;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.IButton;
import com.smartgwt.client.widgets.events.ClickEvent;
import com.smartgwt.client.widgets.events.ClickHandler;
import com.smartgwt.client.widgets.form.DynamicForm;
import com.smartgwt.client.widgets.form.fields.SelectItem;
import com.smartgwt.client.widgets.form.fields.events.ChangedEvent;
import com.smartgwt.client.widgets.form.fields.events.ChangedHandler;
import com.smartgwt.client.widgets.form.validator.FloatPrecisionValidator;
import com.smartgwt.client.widgets.form.validator.FloatRangeValidator;
import com.smartgwt.client.widgets.grid.ListGrid;
import com.smartgwt.client.widgets.grid.events.RecordClickEvent;
import com.smartgwt.client.widgets.grid.events.RecordClickHandler;
import com.smartgwt.client.widgets.layout.HLayout;
import com.smartgwt.client.widgets.layout.VLayout;

public class Showcase implements EntryPoint {
  public void onModuleLoad() {

    RootPanel.get().add(getViewPanel());
  }

  public Canvas getViewPanel() {
    final DataSource countryDS = CountryXmlDS.getInstance();
    final DataSource supplyItemDS = ItemSupplyXmlDS.getInstance();

    final CompoundEditor cEditor = new CompoundEditor(countryDS);

    SelectItem dsSelect = new SelectItem();
    dsSelect.setName("datasource");
    dsSelect.setShowTitle(false);
    dsSelect.setValueMap("country", "supply");
    dsSelect.addChangedHandler(new ChangedHandler() {
      public void onChanged(ChangedEvent event) {
        String ds = (String) event.getValue();
        if (ds.equalsIgnoreCase("country")) {
          cEditor.setDatasource(countryDS);
        } else {
          cEditor.setDatasource(supplyItemDS);
        }
      }
    });
    DynamicForm form = new DynamicForm();
    form.setValue("datasource", "Select a DataSource");
    form.setItems(dsSelect);

    VLayout layout = new VLayout(15);
    layout.setWidth100();
    layout.setHeight("80%");

    layout.addMember(form);
    layout.addMember(cEditor);

    return layout;
  }

  private static class CompoundEditor extends HLayout {
    private DataSource datasource;

    private DynamicForm form;

    private ListGrid grid;

    private IButton saveButton;

    private CompoundEditor(DataSource datasource) {
      this.datasource = datasource;
    }

    protected void onInit() {
      super.onInit();
      this.form = new DynamicForm();

      form.setDataSource(datasource);

      saveButton = new IButton("Save");
      saveButton.setLayoutAlign(Alignment.CENTER);
      saveButton.addClickHandler(new ClickHandler() {

        public void onClick(ClickEvent event) {
          form.saveData();
        }
      });

      VLayout editorLayout = new VLayout(5);
      editorLayout.addMember(form);
      editorLayout.addMember(saveButton);
      editorLayout.setWidth(280);

      grid = new ListGrid();
      grid.setWidth(500);
      grid.setHeight(350);
      grid.setDataSource(datasource);
      grid.setShowResizeBar(true);
      grid.setAutoFetchData(true);
      grid.addRecordClickHandler(new RecordClickHandler() {
        public void onRecordClick(RecordClickEvent event) {
          form.clearErrors(true);
          form.editRecord(event.getRecord());
          saveButton.enable();
        }

      });

      addMember(grid);
      addMember(editorLayout);
    }

    public DataSource getDatasource() {
      return datasource;
    }

    public void setDatasource(DataSource datasource) {
      this.datasource = datasource;
      grid.setDataSource(datasource);
      form.setDataSource(datasource);
      saveButton.disable();
      grid.fetchData();
    }
  }

}

class ItemSupplyXmlDS extends DataSource {

  private static ItemSupplyXmlDS instance = null;

  public static ItemSupplyXmlDS getInstance() {
    if (instance == null) {
      instance = new ItemSupplyXmlDS("supplyItemDS");
    }
    return instance;
  }

  public ItemSupplyXmlDS(String id) {

    setID(id);
    setRecordXPath("/List/supplyItem");
    DataSourceIntegerField pkField = new DataSourceIntegerField("itemID");
    pkField.setHidden(true);
    pkField.setPrimaryKey(true);

    DataSourceTextField itemNameField = new DataSourceTextField("itemName", "Item Name", 128, true);
    DataSourceTextField skuField = new DataSourceTextField("SKU", "SKU", 10, true);

    DataSourceTextField descriptionField = new DataSourceTextField("description", "Description",
        2000);
    DataSourceTextField categoryField = new DataSourceTextField("category", "Category", 128, true);
    categoryField.setForeignKey("supplyCategoryDS.categoryName");

    DataSourceEnumField unitsField = new DataSourceEnumField("units", "Units", 5);
    unitsField.setValueMap("Roll", "Ea", "Pkt", "Set", "Tube", "Pad", "Ream", "Tin", "Bag", "Ctn",
        "Box");

    DataSourceFloatField unitCostField = new DataSourceFloatField("unitCost", "Unit Cost", 5);
    FloatRangeValidator rangeValidator = new FloatRangeValidator();
    rangeValidator.setMin(0);
    rangeValidator.setErrorMessage("Please enter a valid (positive) cost");

    FloatPrecisionValidator precisionValidator = new FloatPrecisionValidator();
    precisionValidator.setPrecision(2);
    precisionValidator.setErrorMessage("The maximum allowed precision is 2");

    unitCostField.setValidators(rangeValidator, precisionValidator);

    DataSourceBooleanField inStockField = new DataSourceBooleanField("inStock", "In Stock");

    DataSourceDateField nextShipmentField = new DataSourceDateField("nextShipment", "Next Shipment");

    setFields(pkField, itemNameField, skuField, descriptionField, categoryField, unitsField,
        unitCostField, inStockField, nextShipmentField);

    setDataURL("ds/test_data/supplyItem.data.xml");
    setClientOnly(true);
  }
}

class CountryXmlDS extends DataSource {

  private static CountryXmlDS instance = null;

  public static CountryXmlDS getInstance() {
    if (instance == null) {
      instance = new CountryXmlDS("countryDS");
    }
    return instance;
  }

  public CountryXmlDS(String id) {

    setID(id);
    setRecordXPath("/List/country");
    DataSourceIntegerField pkField = new DataSourceIntegerField("pk");
    pkField.setHidden(true);
    pkField.setPrimaryKey(true);

    DataSourceTextField countryCodeField = new DataSourceTextField("countryCode", "Code");
    countryCodeField.setRequired(true);

    DataSourceTextField countryNameField = new DataSourceTextField("countryName", "Country");
    countryNameField.setRequired(true);

    DataSourceTextField capitalField = new DataSourceTextField("capital", "Capital");
    DataSourceTextField governmentField = new DataSourceTextField("government", "Government", 500);

    DataSourceBooleanField memberG8Field = new DataSourceBooleanField("member_g8", "G8");

    DataSourceTextField continentField = new DataSourceTextField("continent", "Continent");
    continentField.setValueMap("Europe", "Asia", "North America", "Australia/Oceania",
        "South America", "Africa");

    DataSourceDateField independenceField = new DataSourceDateField("independence", "Nationhood");
    DataSourceFloatField areaField = new DataSourceFloatField("area", "Area (km²)");
    DataSourceIntegerField populationField = new DataSourceIntegerField("population", "Population");
    DataSourceFloatField gdpField = new DataSourceFloatField("gdp", "GDP ($M)");
    DataSourceLinkField articleField = new DataSourceLinkField("article", "Info");

    setFields(pkField, countryCodeField, countryNameField, capitalField, governmentField,
        memberG8Field, continentField, independenceField, areaField, populationField, gdpField,
        articleField);

    setDataURL("ds/test_data/country.data.xml");
    setClientOnly(true);
  }
}

   
    
    
  








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