An interface implemented by a tooltip text provider service. This
service is called to discover what tooltip text is associated
with the node that the pointer is positioned over.
Embedders may implement and register their own tooltip text provider
service if they wish to provide different tooltip text.
The default service returns the text stored in the TITLE
attribute of the node or a containing parent.
@note
The tooltip text provider service is registered with the contract
defined in NS_TOOLTIPTEXTPROVIDER_CONTRACTID.
@see nsITooltipListener
@see nsIComponentManager
@see nsIDOMNode
Called to obtain the tooltip text for a node.
@arg aNode The node to obtain the text from.
@arg aText The tooltip text.
PR_TRUE if tooltip text is associated
with the node and was returned in the aText argument;
PR_FALSE otherwise.
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