public StockPresenter(final StockView view) {
this.view = view;
stocks = new ListVariable<StockSymbol>();
// set up event listeners for adding a new stock
StreamMerge.<Object>mergeStreams(
view.addButtonClick(), view.newSymbolTextEntry().keyDown().filter(new IsEnterKeyCode()))
.loop(
new Effect<Object>() {
@Override
public void e(Object o) {
addStock();
}
});
// set up timer to refresh list automatically
final Timer refreshTimer =
new Timer() {
public void run() {
refreshWatchList();
}
};
refreshTimer.scheduleRepeating(REFRESH_INTERVAL);
// move cursor focus to the text box
view.newSymbolTextEntry().focus().put(true);
}
private void addStock() {
final String symbol = view.newSymbolTextEntry().value().get().toUpperCase().trim();
view.newSymbolTextEntry().focus().put(true);
// symbol must be between 1 and 10 chars that are numbers, letters, or dots
if (!symbol.matches("^[0-9a-zA-Z\\.]{1,10}$")) {
Window.alert("'" + symbol + "' is not a valid symbol.");
view.newSymbolTextEntry().selectAll();
return;
}
view.newSymbolTextEntry().value().put("");
final StockSymbol stockSymbol = new StockSymbol(symbol);
// don't add the stock if it's already in the watch list
if (stocks.get().exists(stockSymbol.equalsFunction())) {
return;
}
// add the stock to the list
stocks.snoc(stockSymbol);
int row = stocksFlexTable.getRowCount();
stocksFlexTable.setText(row, 0, symbol);
Button removeStock = new Button("x");
removeStock.addClickListener(
new ClickListener() {
public void onClick(Widget sender) {
int removedIndex = stocks.elementIndex(StockSymbol.EQUAL, stockSymbol).some();
stocks.delete(stockSymbol, StockSymbol.EQUAL);
stocksFlexTable.removeRow(removedIndex + 1);
}
});
stocksFlexTable.setWidget(row, 3, removeStock);
// get stock price
refreshWatchList();
}