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Window display system and method for creating multiple scrollable and non-scrollable display regions on a non-programmable computer terminal

  • US 5,175,813 A
  • Filed: 07/20/1992
  • Issued: 12/29/1992
  • Est. Priority Date: 08/14/1989
  • Status: Expired due to Fees
First Claim
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1. In a data processing system including a non-programmable display terminal capable of displaying a plurality of independent scrollable partitions and a plurality of independent non-scrollable partitions and a processing unit, a method for displaying overlapping logical windows on the non-programmable display terminal, comprising the steps executed by the data processing system of:

  • responsive to creation of a logical window by an application program, allocating one of a plurality of window control blocks to the logical window, wherein the window control block includes pointers to a plurality of preexisting data clusters;

    filling a plurality of partition identifiers in the window control block, including at least a first partition identifier corresponding to a non-scrollable partition to provide a boundary for the logical window and a second identifier corresponding to a scrollable partition for the logical window;

    for each non-scrollable and scrollable partition, setting a pointer in the window control block to a data cluster for the partition defining its attributes for overlapping the scrollable partition on the non-scrollable partition;

    generating the non-scrollable partition corresponding to the first partition identifier for the logical window on he non-programmable display terminal; and

    generating the scrollable partition corresponding to the second partition identifier for the logical window on the non-programmable display terminal, overlapping the non-scrollable partition to present the logical window on the non-programmable display terminal to a user.

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