ru.curs.lyra.kernel.grid

Class GridDriver

java.lang.Object

ru.curs.lyra.kernel.grid.GridDriver

public final class GridDriver
extends Object

Specifies the record position asynchronously, using separate execution thread.

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_COUNT The default assumption for a records count in a table.
static int	DEFAULT_SMALL_SCROLL
static long	REFINEMENT_DELAY_MS

Constructor Summary

Constructors

Constructor and Description
GridDriver(ru.curs.celesta.dbutils.BasicCursor c, Runnable changeNotifier)

Method Summary

Modifier and Type	Method and Description
int	getApproxTotalCount() Returns (approximate) total record count.
Runnable	getChangeNotifier() Gets change notifier.
int	getMaxExactScrollValue() If the grid is scrolled less than for returned number of records, the exact positioning in cycle will be used instead of interpolation.
int	getTopVisiblePosition() Returns scrollbar's knob position for current cursor value.
boolean	isValidFor(ru.curs.celesta.dbutils.BasicCursor c) Checks if this driver is valid for a given cursor with its filters and sorting.
void	setMaxExactScrollValue(int smallScroll) If the grid is scrolled less than for given amount of records, the exact positioning in cycle will be used instead of interpolation.
void	setPosition(ru.curs.celesta.dbutils.BasicCursor c) Adjusts internal state for pre-positioned cursor.
boolean	setPosition(int position, ru.curs.celesta.dbutils.BasicCursor c) Fills key fields of a cursor based on scroller knob position.
void	truncate()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_SMALL_SCROLL

public static final int DEFAULT_SMALL_SCROLL

See Also:

Constant Field Values

REFINEMENT_DELAY_MS

public static final long REFINEMENT_DELAY_MS

See Also:

Constant Field Values

DEFAULT_COUNT

public static final int DEFAULT_COUNT

The default assumption for a records count in a table.

See Also:

Constant Field Values

Constructor Detail

GridDriver

public GridDriver(ru.curs.celesta.dbutils.BasicCursor c,
                  Runnable changeNotifier)

Method Detail

isValidFor

public boolean isValidFor(ru.curs.celesta.dbutils.BasicCursor c)

Checks if this driver is valid for a given cursor with its filters and sorting.

Parameters:

c - Cursor for checking.

setPosition

public boolean setPosition(int position,
                           ru.curs.celesta.dbutils.BasicCursor c)

Fills key fields of a cursor based on scroller knob position.

Parameters:

position - scrollbar knob position

c - Alive cursor to be modified

Returns:

false if record set is empty

truncate

public void truncate()

setPosition

public void setPosition(ru.curs.celesta.dbutils.BasicCursor c)

Adjusts internal state for pre-positioned cursor.

Parameters:

c - Cursor that is set to a certain position.

getTopVisiblePosition

public int getTopVisiblePosition()

Returns scrollbar's knob position for current cursor value.

getApproxTotalCount

public int getApproxTotalCount()

Returns (approximate) total record count.

Just after creation of this object this method returns DEFAULT_COUNT value, but it asynchronously requests total count right after constructor execution.

getChangeNotifier

public Runnable getChangeNotifier()

Gets change notifier.

setMaxExactScrollValue

public void setMaxExactScrollValue(int smallScroll)

If the grid is scrolled less than for given amount of records, the exact positioning in cycle will be used instead of interpolation.

Parameters:

smallScroll - new value.

getMaxExactScrollValue

public int getMaxExactScrollValue()

If the grid is scrolled less than for returned number of records, the exact positioning in cycle will be used instead of interpolation.