| 摘要 |
An improved navigation method implemented as a graphical user interface (GUI). The GUI has navigation tools to allow a user to navigate to different locations of a structure of data. The GUI stores a history chain containing a sequence of nodes including a first node and a last node, each node represents a location the user has previously navigated to. The GUI moves backward or forward along the history chain in response to a back or forward command from the user. When a current node position in the history chain is the first (or last) node and a back (or forward) command is received, the GUI moves to the last (or first) node of the history chain, thereby forming a looped history chain.
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