GWT Notes: TabLayoutPanel

I’ve been putting in some time over the past week building UI’s with GoogleWebToolkit and the new UIBinder.

It is all very spiffy and so much easier to use than 1.7 was. Last summer I tried to put together some moderately complex UI’s and found that doing everything in Java to be slow and tedious.

I will cautiously say that I am getting the hang of UIBinder, and that is far and away my current favorite feature from the new 2.0.0 release.

That said, there are a few minor snags.

The new LayoutPanels are for fast, browser-rendered widgets, done in standards mode. I prefer them to the old Panels they replace because they don’t use tables, instead the layout is all clean css and <div>s.

But when I started working with the TabLayoutPanel, I ran into some problems which I’ve listed below.

The TabLayoutPanel doesn’t display at all, or you get a weird collapsed layout (if you’ve added css). Remember, you  must use standards mode <!DOCTYPE html> for LayoutPanels, and you have to use RootLayoutPanel.get() instead of the old RootPanel.get().

There aren’t any default css styles. If all you see are the tabs titles with no styling… check the apidoc to see the css styles you need to add. This isn’t actually a bug, but without default css the class is pretty much worthless. (There is an issue for this.)
The tabs display, but the tab widgets (content area) don’t. You need to set the  height of the .gwt-TabLayoutPanel.
It doesn’ work in IE (what does?).  There’s a bug with TabLayoutPanel and IE, and a simple css workaround:
.gwt-TabLayoutPanel .gwt-TabLayoutPanelTab { float: left; }

Update: See my next post, More on TabLayoutPanel for some sample css and demos.

Update 2: GWT version 2.0.1 address the problems with IE and provides a default CSS style. You still have to remember to use RootLayoutPanel, and standards mode doctype, when using a LayoutPanel.

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