Question

I am newly using GWT.
I am using a simple code to create popup I add few labels ontop and show()

final PopupPanel popup = new PopupPanel();

popup.setTitle("Start connector");
popup.add(new Label("Hello"));

popup.center();
popup.show();

Now I need two things:

1. freeze the background when the popup is displayed
2. the setTitle() does not add the title to the popuppanel window.

any hints will be useful.

Regards, Rohit

Answer 1

freeze the background when the popup is displayed

Have a look at setGlassEnabled.

From the PopupPanel javadoc:

The PopupPanel can be optionally displayed with a “glass” element behind it, which is commonly used to gray out the widgets behind it. It can be enabled using setGlassEnabled(boolean). It has a default style name of “gwt-PopupPanelGlass”, which can be changed using setGlassStyleName(String).

Just an advice: do not use the “modal” behavior of PopupPanel, it’s way too buggy to be usable. setGlassEnabled was added later as a replacement (not fully equivalent, but behaving reliably), and setModal is only kept there for backwards compatiibility.

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the setTitle() does not add the title to the popuppanel window.

As the javadoc says:

The title is the ‘tool-tip’ displayed to users when they hover over the object.

You’re responsible for the PopupPanel’s content. Either you put a Label or whatever in the PopupPanel and make it look like a “title”, or you can use a DialogBox.