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Static Versus Dynamic Widget Management
Table 20–1 compares the major 4GL actions involving static and dynamic widgets and summarizes their differences.
Table 20–1: Static Versus Dynamic Widget Management 4GL
Widget Action Accomplished for
Static Widgets by . . . Accomplished for
Dynamic Widgets by . . . Create DEFINE widget statement, VIEW–AS phrase, FORM statement (for frames), and default scoping (for frames). CREATE widget statement Delete N/A DELETE WIDGET or DELETE WIDGET–POOL statement1 Reference Definition name at compile time and run time; widget handle at run time Widget handle at run time View on Display Frame I/O statements, including ENABLE, DISPLAY, INSERT, UPDATE, SET, or PROMPT–FOR; VIEW statement Hide from Display HIDE statement HIDE statement or setting the VISIBLE attribute of each widget to FALSE2 Make Sensitive to
Input ENABLE, INSERT, UPDATE, SET, or PROMPT–FOR statement Setting the SENSITIVE attribute of each widget to TRUE2 Make Insensitive to Input DISABLE statement Setting the SENSITIVE attribute of each widget to FALSE2 Block for Input WAIT–FOR, INSERT, UPDATE, SET or PROMPT–FOR statement WAIT–FOR statement Move Data from Screen to Record Buffer ASSIGN, SET, INSERT, or UPDATE statement applied to corresponding field or variable Explicit assignment from the SCREEN–VALUE attribute of the widget to a specified field or variable2 Move Data from Record to Screen Buffer DISPLAY, INSERT, or UPDATE statement applied to corresponding field or variable Explicit assignment from a specified field, variable, or constant to the SCREEN–VALUE attribute of the widget2
- For more information on widget pools, see the "Managing Dynamic Widget Pools" section.
- You can also use these techniques with static widgets.
- The behavior of the VISIBLE attribute also depends on the setting of the HIDDEN attribute.
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