#include <d32dbms.h>
| class TDbWindow |
| Public Member Enumerations | |
|---|---|
| enum | anonymous { ENone } |
| enum | TUnlimited { EUnlimited } |
| Public Member Functions | |
|---|---|
| TDbWindow() | |
| TDbWindow(TUnlimited) | |
| TDbWindow(TInt, TInt) | |
| TInt | PreferredPos() |
| TInt | Size() |
Describes the desired shape of a view's pre-evaluation window.
An instance of this class is passed to the RDbView object as part of the Prepare() function. The different constructors for TDbWindow can specify a view:
without pre-evaluation
with full pre-evaluation
with limited pre-evaluation.
See also: RDbView
| TDbWindow | ( | ) | [inline] |
Constructs this object with a size of ENone. This can be used to request a view with no pre-evaluation window.
| TDbWindow | ( | TUnlimited | ) | [inline] |
Constructs this object with a size of EUnlimited. This is used to request a completely pre-evaluated view. The constant KDbUnlimitedWindow is an instance of such a TDbWindow.
Constructs this object with the preferred shape. When fully evaluated, the view will try to have aForeSlots rows immediately available for navigation forwards, and aRearSlots rows immediately available for navigation backwards.
| Parameter | Description |
|---|---|
| aForeSlots | The number of rows to evaluate ahead of the current row. |
| aRearSlots | The number of rows to evaluate behind the current row. |
| TInt | PreferredPos | ( | ) | const [inline] |
Returns the preferred position in the window of the current row marker. i.e. the position with the forward and backward slots as requested.
Returns: The preferred position in the window. It is undefined if this is not a limited window.
| TInt | Size | ( | ) | const [inline] |
Returns the number of rows stored by the view.
Returns: The number of rows stored by the window. This could be one of the special values ENone or EUnlimited.