Sorry for the late reply (for some reason I did not receive an email notification), but I did manage to resolve the issue by creating checkbox cells in the table itself like this:
CheckboxCell cell = new CheckboxCell(true,true) I've been focused on the header checkbox mostly and tried every possible combination of the two flags, but forgot to try the same on the checkbox cell in the grid, as a StackOverflow user pointed out in the topic I've opened there as well. On Saturday, August 3, 2013 1:20:27 AM UTC+12, Thomas Broyer wrote: > > Any reason you don't simply use the default render() and onBrowserEvent > from Header? > See https://code.google.com/p/google-web-toolkit/issues/detail?id=7014#c6for > details of how we did it; I suppose you could "package" it into a > Header subclass if you want. > > On Friday, August 2, 2013 3:06:52 AM UTC+2, Miloš Ranđelović wrote: >> >> I have a GWT DataGrid, and a CheckBox in the Header to select/deselect >> all rows in the grid. >> >> The code for the CheckBox Header is as follows: >> >>> private class CheckboxHeader extends Header<Boolean> implements >>> HasValue<Boolean> { >>> >>> private boolean checked; >>> private HandlerManager handlerManager; >>> >>> /** >>> * An html string representation of a checked input box. >>> */ >>> private final SafeHtml INPUT_CHECKED = >>> SafeHtmlUtils.fromSafeConstant("<input type=\"checkbox\" tabindex=\"-1\" >>> checked/>"); >>> /** >>> * An html string representation of an unchecked input box. >>> */ >>> private final SafeHtml INPUT_UNCHECKED = >>> SafeHtmlUtils.fromSafeConstant("<input type=\"checkbox\" >>> tabindex=\"-1\"/>"); >>> >>> @Override >>> public void render(Context context, SafeHtmlBuilder sb) { >>> if (Boolean.TRUE.equals(this.getValue())) { >>> sb.append(INPUT_CHECKED); >>> } else { >>> sb.append(INPUT_UNCHECKED); >>> } >>> }; >>> >>> public CheckboxHeader() { >>> super(new CheckboxCell(true, false)); >>> checked = true; >>> } >>> >>> // This method is invoked to pass the value to the CheckboxCell's >>> render method >>> @Override >>> public Boolean getValue() { >>> return checked; >>> } >>> >>> @Override >>> public void onBrowserEvent(Context context, Element elem, NativeEvent >>> nativeEvent) { >>> int eventType = Event.as(nativeEvent).getTypeInt(); >>> if (eventType == Event.ONCHANGE) { >>> nativeEvent.preventDefault(); >>> // use value setter to easily fire change event to handlers >>> setValue(!checked, true); >>> } >>> } >>> >>> @Override >>> public HandlerRegistration >>> addValueChangeHandler(ValueChangeHandler<Boolean> handler) { >>> return >>> ensureHandlerManager().addHandler(ValueChangeEvent.getType(), handler); >>> } >>> >>> @Override >>> public void fireEvent(GwtEvent<?> event) { >>> ensureHandlerManager().fireEvent(event); >>> } >>> >>> @Override >>> public void setValue(Boolean value) { >>> setValue(value, true); >>> } >>> >>> @Override >>> public void setValue(Boolean value, boolean fireEvents) { >>> checked = value; >>> if (fireEvents) { >>> ValueChangeEvent.fire(this, value); >>> } >>> } >>> >>> private HandlerManager ensureHandlerManager() { >>> if (handlerManager == null) { >>> handlerManager = new HandlerManager(this); >>> } >>> return handlerManager; >>> } >>> } >>> >>> >> So, I add the Header to the grid, and I add a ValueChangeHandler to it >> to do the actual selecting/deselecting of individual CheckBox cells in >> every row of the grid. This all works. >> >> Every CheckBoxCell has a Field Updater, and on every update it loops >> through every item in the grid to see if they are all checked, and update >> the header check box. If at least one is unchecked, the header checkbox >> will be unchecked. I call setValue() on the header check box, and after >> that I call redrawHeaders() on the entire grid. This also works. >> >> What doesn't work is - after changing the "state" of the header check box >> programatically, it takes two clicks for it to fire it's internal setValue >> again, and therefore trigger my handler. And what's even funnier - the >> first click *does* change the state of the check box, but it just >> doesn't fire the event. >> Any help would be appreciated. >> > -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscr...@googlegroups.com. To post to this group, send email to google-web-toolkit@googlegroups.com. Visit this group at http://groups.google.com/group/google-web-toolkit. For more options, visit https://groups.google.com/groups/opt_out.
