Attributes indicate the current status of various characteristics of a field. Bit numbers 0 to 15 are assigned specific meaning by the view API. Bit numbers 16 to 31 are reserved for view implementers to assign their own meaning.
The state of a static attribute does not change for the duration of the view handle instance being open. The state of a dynamic attribute can change at any time.
The mask equals 1 shifted left by the bit number.
| Attribute | Kind | Bit | Mask | Meaning When Set |
|---|---|---|---|---|
| Calculated | Static | 4 | 0x010 | Value is calculated non-interactively. |
| Changed | Dynamic | 0 | 0x001 | Value been changed since the last operation that retrieved or initialized the view's current record. |
| Check-editability | Static | 8 | 0x100 | Editable attribute can change dynamically. |
| Editable | Static/Dynamic | 2 | 0x004 | Value can be changed. This is a static attribute by default, and dynamic if the Check-editability is on. |
| Enabled | Dynamic | 1 | 0x002 | Field can be meaningfully used. In it absence most field operations are not permitted, and return an error. |
| Key | Dynamic | 3 | 0x008 | This field is a segment of the current key. |
| Presentation | Static | 6 | 0x040 | Presentation information can change dynamically. |
| Required | Dynamic | 7 | 0x080 | Value must be changed interactively before the record can be inserted. |
| Type | Static | 5 | 0x020 | Type information can change dynamically. |
| Flag | Meaning When Set |
|---|---|
| Audit-stamp | ??? |
| Record-structure | ??? |
| Flag | Meaning When Set |
|---|---|
| Duplicates | ??? |
| Modifiable | ??? |
This page was generated on 2019-Sep-26
© 2024 TaiRox Software Inc.