com.google.gwt.sample.stockwatcher.client.StockWatcherActivity.java Source code

Introduction

Here is the source code for com.google.gwt.sample.stockwatcher.client.StockWatcherActivity.java

Source

package com.google.gwt.sample.stockwatcher.client;

import java.util.ArrayList;
import java.util.Date;

import com.google.gwt.activity.shared.AbstractActivity;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.event.dom.client.KeyPressHandler;
import com.google.gwt.event.shared.EventBus;
import com.google.gwt.i18n.client.DateTimeFormat;
import com.google.gwt.i18n.client.DateTimeFormat.PredefinedFormat;
import com.google.gwt.i18n.client.NumberFormat;
import com.google.gwt.place.shared.Place;
import com.google.gwt.sample.stockwatcher.client.StockWatcherDisplay.Presenter;
import com.google.gwt.user.client.Random;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.AcceptsOneWidget;

public class StockWatcherActivity extends AbstractActivity implements Presenter {
    private StockWatcherDisplay display;
    private EventBus eventBus;
    private ArrayList<String> stocks = new ArrayList<String>();
    private final ClientFactory clientFactory;
    private Timer timer;

    public StockWatcherActivity(StockWatcherListPlace place, ClientFactory clientFactory) {
        super();
        this.clientFactory = clientFactory;
    }

    public void bind() {
        this.display.getAddButton().addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                addStock();
            }

        });

        this.display.getInputAsKeyPressHandler().addKeyPressHandler(new KeyPressHandler() {
            public void onKeyPress(KeyPressEvent event) {
                if (event.getCharCode() == KeyCodes.KEY_ENTER) {
                    addStock();
                }
            }
        });

        eventBus.addHandler(RefreshStockListEvent.TYPE, new RefreshStockListEventHandler() {
            @Override
            public void onRefreshStockList(RefreshStockListEvent event) {
                final double MAX_PRICE = 100.0; // $100.00
                final double MAX_PRICE_CHANGE = 0.02; // +/- 2%

                StockPrice[] prices = new StockPrice[stocks.size()];
                for (int i = 0; i < stocks.size(); i++) {
                    double price = Random.nextDouble() * MAX_PRICE;
                    double change = price * MAX_PRICE_CHANGE * (Random.nextDouble() * 2.0 - 1.0);

                    prices[i] = new StockPrice((String) stocks.get(i), price, change);
                }

                updateTable(prices);
            }
        });

        eventBus.addHandler(RemoveStockEvent.TYPE, new RemoveStockEventHandler() {
            @Override
            public void onRemoveStock(RemoveStockEvent event) {
                int row = stocks.indexOf(event.getSymbol()) + 1;
                stocks.remove(event.getSymbol());
                display.removeRow(row);
            }
        });
    }

    private void updateTable(StockPrice[] prices) {
        for (StockPrice sp : prices) {
            updateTable(sp);
        }

        // change the last update timestamp
        display.getLastUpdated().setText(
                "Last updated: " + DateTimeFormat.getFormat(PredefinedFormat.DATE_TIME_MEDIUM).format(new Date()));

    }

    private void updateTable(StockPrice stockPrice) {
        int row = stocks.indexOf(stockPrice.getSymbol()) + 1;
        String priceText = NumberFormat.getFormat("#,##0.00").format(stockPrice.getPrice());
        NumberFormat changeFormat = NumberFormat.getFormat("+#,##0.00;-#,##0.00");
        String changeText = changeFormat.format(stockPrice.getChange());
        String changePercentText = changeFormat.format(stockPrice.getChangePercent());

        display.setRowData(row, priceText, changeText + " (" + changePercentText + "%)");
    }

    private void addStock() {

        final String symbol = display.getInput().getValue().toUpperCase().trim();
        // newSymbolTextBox.setFocus(true);

        // Stock code must be between 1 and 10 chars that are numbers, letters,
        // or dots.
        if (!symbol.matches("^[0-9A-Z\\.]{1,10}$")) {
            Window.alert("'" + symbol + "' is not a valid symbol.");
            display.selectAllInput();
            return;
        }

        display.getInput().setValue("");

        if (stocks.contains(symbol)) {
            return;
        }
        stocks.add(symbol);
        display.addRow(symbol, new RemoveStockEvent(symbol));

        eventBus.fireEvent(new AddStockEvent());
    }

    @Override
    public void goTo(Place place) {
        clientFactory.getPlaceController().goTo(place);
    }

    @Override
    public void start(AcceptsOneWidget panel, EventBus eventBus) {
        StockWatcherDisplay stockWatcherView = clientFactory.getStockWatcherView();
        stockWatcherView.setPresenter(this);
        // stockWatcherView.setEventBus(eventBus);

        this.display = clientFactory.getStockWatcherView();
        this.eventBus = eventBus;

        bind();

        panel.setWidget(stockWatcherView.asWidget());

        timer = new Timer() {
            @Override
            public void run() {
                clientFactory.getEventBus().fireEvent(new RefreshStockListEvent());
            }
        };
        timer.scheduleRepeating(5000);

    }

    @Override
    public String mayStop() {
        return "About to stop";
    }

    @Override
    public void onStop() {
        timer.cancel();
        timer = null;
    }
}