TabSet onTabSelected event firing when no tab is selected?

[jasmith]

SC_SNAPSHOT-2011-01-06/PowerEdition Deployment 2011-01-06
GWT 1.7.1
IE 7 Dev Console

Perhaps I'm not doing something correctly, but the TabSelected event is firing when there is no tab selected. Below I am simply assembling a TabSet but not explicitly selecting a Tab:

public MainEntryPoint() {
    }

    private TabSet tabSet;

    public void onModuleLoad() {
        HLayout layout = new HLayout();  
        layout.setWidth(300);
        layout.setHeight(200);
        layout.setMembersMargin(20);

        tabSet = new TabSet();
        tabSet.setTabBarPosition(Side.TOP);
        tabSet.setWidth100();
        tabSet.setHeight100();
        tabSet.setTabBarThickness(22);

        Tab manager = new Tab("one");
        Tab broker = new Tab("two");
        Tab stock = new Tab("three");
        Tab multi = new Tab("four");
        Tab none = new Tab("none");

        tabSet.addTab(manager);  //0
        tabSet.addTab(broker);   //1
        tabSet.addTab(stock);    //2
        tabSet.addTab(multi);    //3
        tabSet.addTab(none);        //4

        VLayout spacer1 = new VLayout();
        spacer1.setWidth("10px");

        tabSet.setTabBarControls(TabBarControls.TAB_SCROLLER, TabBarControls.TAB_PICKER);

        tabSet.addTabSelectedHandler(tabSetTabSelectedHandler);

        layout.addMember(tabSet);
        layout.draw();
    }

    private TabSelectedHandler tabSetTabSelectedHandler = new TabSelectedHandler() {

        public void onTabSelected(TabSelectedEvent event) {
            GWT.log("TabSelectedHandler.onTabSelected:" + event.getTab().getTitle(), null);
        }
    };

You can see the output of the Dev Console with my debug statements:

[INFO] TabSelectedHandler.onTabSelected:one

[Isomorphic]

Expected: the first tab becomes selected as the TabSet draws.

[jasmith]

To follow up on this example, I added a button to actually select the first tab, and now the event does not fire:

private TabSet tabSet;

    public void onModuleLoad() {
        HLayout layout = new HLayout();  
        layout.setWidth(300);
        layout.setHeight(200);
        layout.setMembersMargin(20);

        tabSet = new TabSet();
        tabSet.setTabBarPosition(Side.TOP);
        tabSet.setWidth100();
        tabSet.setHeight100();
        tabSet.setTabBarThickness(22);

        Tab manager = new Tab("one");
        Tab broker = new Tab("two");
        Tab stock = new Tab("three");
        Tab multi = new Tab("four");
        Tab none = new Tab("none");

        tabSet.addTab(manager);  //0
        tabSet.addTab(broker);   //1
        tabSet.addTab(stock);    //2
        tabSet.addTab(multi);    //3
        tabSet.addTab(none);        //4

        VLayout spacer1 = new VLayout();
        spacer1.setWidth("10px");

        tabSet.setTabBarControls(TabBarControls.TAB_SCROLLER, TabBarControls.TAB_PICKER);

        tabSet.addTabSelectedHandler(tabSetTabSelectedHandler);

        IButton button = new IButton("ClickMe");
        button.addClickHandler(new ClickHandler() {

            public void onClick(ClickEvent event) {
                GWT.log("selecting tabSet.selectTab(0)", null);
                tabSet.selectTab(0);
            }
        });

        layout.addMember(tabSet);
        layout.addMember(button);
        layout.draw();

    }

    private TabSelectedHandler tabSetTabSelectedHandler = new TabSelectedHandler() {

        public void onTabSelected(TabSelectedEvent event) {
            GWT.log("TabSelectedHandler.onTabSelected:" + event.getTab().getTitle(), null);
        }
    };

Here is my Dev Console output:

[INFO] TabSelectedHandler.onTabSelected:one
[INFO] selecting tabSet.selectTab(0)

After pushing the button, I am explicitly selecting the first tab, and the onTabSelected event does not fire?

[Isomorphic]

It is already selected.

This API is designed around dynamic construction of the tab pane. Look at it that way and you'll see it's firing at just the right times.

[jasmith]

So when the first Tab is added to the TabSet, that first tab added will fire the event?

[Isomorphic]

Not necessarily. Again, the first tab becomes selected as the TabSet draws. If you are adding a series of tabs to an undrawn TabSet, TabSelected doesn't fire.

[jasmith]

Ok, that clarifies things. I need to setup my TabSet before it is drawn, it is the drawing of the TabSet that fires the onTabSelected event.

[smartgwt.dev]

You could try adding the tab selected handler in a TabSet.addDrawHandler(..)