Working on a stock market system, I've implemented a data grid that shows
the open positions for a trader. That grid has a number of columns showing
current price fluctuations which might change as many as 20 times a second.
There is also a column containing a "close position" button pressing which
causes the position to be closed. The smallest resolution GWT provides for
grid update is redrawRow(int row). That's what I use to update the grid
with live data.
The problem I have is that redrawRow() sometimes cancels close button
events. To put it more precisely, if a user presses and holds the close
button pressed for a while, and then releases it, the event will be lost if
redrawRow has been invoked for the same row. That is reported as "very
annoying" by most users, and we are failing to come up with a workaround to
solve it. Do you have any idea how to solve this issue?
Below is how we create the close button cell:
private static ButtonCell closeButton = new ButtonCell(){
private String imageResource = new Image(FxResources.INSTANCE.
closePosition().getSafeUri()).toString();
private SafeHtml html = SafeHtmlUtils.fromTrustedString(
"<button type=\"button\" class=\"gwt-Button\">" +
imageResource + "</button>");
@Override
public void render(
final Context context,
final SafeHtml data,
final SafeHtmlBuilder sb) {
sb.append(html);
}
};
Adding the button cell to a column and wiring it up:
final Column<MarketOrderDTO, String> closeColumn = new Column<MarketOrderDTO
, String>(closeButton) {
@Override
public String getValue(MarketOrderDTO mo) {
return "";
}
};
closeColumn.setCellStyleNames("closeButtonCell");
closeColumn.setFieldUpdater(new FieldUpdater<MarketOrderDTO, String
>() {
@Override
public void update(int index, MarketOrderDTO mo, String value) {
OrderProcessor.closeMarketOrder(mo);
}
});
dataGrid.addColumn(closeColumn, "");
Thanks!
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