HP 3000 Manual page 289

| O FORM21
| O*
| O
| O
| OWRKSTN
| O*
| O* FORM22
| O*
| O
| O
| O
| O
| O
| O
| O
| O
| 0
| O
|
___________________________________________________________________________________
Figure 5-4.
Overlays and Variable Starting Lines
Overlays are two or more forms that are displayed so that portions of all the forms are visible at the same
time. You can create overlays using the start line number and number of lines to clear form attribute
entries.
For example, a form that starts on line 13 and clears 12 lines occupies the bottom half of the screen,
leaving the top half of the prior form displayed unchanged. This type of overlay can be used to build a
screen with several forms that can be combined dynamically at runtime. For example, this feature can be
used in an inquiry application.
Another example is a form that does not clear any lines, in which case both forms are displayed at the
same time. Input capable fields on the first form are no longer active after the second form is displayed.
Input capable fields on the second form whose screen positions coincide with fields or constants from the
first form have the field or constant as its initial value. This type of overlay can be used to create
applications that use the output data from one form as input data to the next form with the combinations
taking place dynamically at runtime, perhaps to model a new entry after an existing entry of a different
type in a database.
Variable Starting Line forms are forms that start on a line number supplied by the RPG program at
runtime. The start line number form attribute must be V, and the "KSTART" file continuation record must
contain the name of a numeric field two positions long with zero decimal places.
Load the starting line number for the form into the field before you display the form. An example of this
feature is a data entry application that uses a form that is one or two lines long. The same form can be
displayed at different locations on the screen so that the user can see the last few transactions while
entering the current transaction.
ERRMSG
PT1
PT2
PT3
NAME
ADDR
ZIP
PNPT1
PNPT2
PNPT3
RPG Specifications
K6 'FORM21'
6
K6 'FORM22'
3
5
9
35
71
80
83
86
90
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5- 291