HeaderSpan Event Handler

[heavenite]

How do I implement a HeaderSpan Event Handler, which can change the current columns show/hide, or add/remove columns ?
just like http://www.smartclient.com/#analytics

[Isomorphic]

A menu for showing and hiding columns is already built into the component and enabled by default.

Override getHeaderContextMenuItems to add more items for other functions.

[heavenite]

Can not find any ClickEvent for HeaderSpan.
We need to implement the columns show/hide change in a HeaderSpan click.
How can we do to attach a delegate Click event to a spanheader?
Please advice

[Isomorphic]

There's an API getHeaderSpanContextMenuItems in the underlying SmartClient API. If you can confirm this would work for you we'll add a Smart GWT overridable method here.

[heavenite]

Yes, it seems what we want ....

[sjivan]

I've added ListGrid.getHeaderSpanContextMenuItems(HeaderSpan headerSpan) override point to allow header span contenxt menu customizations.

protected MenuItem[] getHeaderSpanContextMenuItems(HeaderSpan headerSpan)

Sample usage :

final ListGrid countryGrid = new ListGrid() {
    @Override
    protected MenuItem[] getHeaderSpanContextMenuItems(final HeaderSpan headerSpan) {
        final MenuItem[] items = super.getHeaderSpanContextMenuItems(headerSpan);
        MenuItem customItem = new MenuItem("Custom MenuItem for " + headerSpan.getTitle());
        customItem.addClickHandler(new ClickHandler() {
            public void onClick(MenuItemClickEvent event) {
                SC.say("Custom MenuItem click on " + headerSpan.getTitle());
            }
        });
        MenuItem[] newItems = new MenuItem[items.length + 1];
        for (int i = 0; i < items.length; i++) {
            MenuItem item = items[i];
            newItems[i] = item;
        }
        newItems[items.length] = customItem;
        return newItems;
    }
};

You can pick up these changes in the next nightly build.

Sanjiv