Package com.vaadin.client.widgets

Class Grid.BodyUpdater

java.lang.Object

com.vaadin.client.widgets.Grid.BodyUpdater

All Implemented Interfaces:

EscalatorUpdater

Direct Known Subclasses:

TreeGrid.BodyUpdater

Enclosing class:

Grid<T>

protected class Grid.BodyUpdater
extends Object
implements EscalatorUpdater

EscalatorUpdater implementation for Grid's body section.

See Also:

EscalatorUpdater

Field Summary

Fields inherited from interface com.vaadin.client.widget.escalator.EscalatorUpdater

NULL

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BodyUpdater()

Method Summary

Modifier and Type	Method	Description
void	postAttach(Row row, Iterable<FlyweightCell> attachedCells)	Called after attaching new cells to the escalator.
void	postDetach(Row row, Iterable<FlyweightCell> detachedCells)	Called after detaching cells from the escalator.
void	preAttach(Row row, Iterable<FlyweightCell> cellsToAttach)	Called before attaching new cells to the escalator.
void	preDetach(Row row, Iterable<FlyweightCell> cellsToDetach)	Called before detaching cells from the escalator.
void	update(Row row, Iterable<FlyweightCell> cellsToUpdate)	Renders a row contained in a row container.

Methods inherited from class java.lang.Object

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

Constructor Detail

BodyUpdater

protected BodyUpdater()

Method Detail

preAttach

public void preAttach(Row row,
                      Iterable<FlyweightCell> cellsToAttach)

Description copied from interface: EscalatorUpdater

Called before attaching new cells to the escalator.

Specified by:

preAttach in interface EscalatorUpdater

Parameters:

row - Information about the row to which the cells will be added. Note: You should not store nor reuse this reference.

cellsToAttach - A collection of cells that are about to be attached. Note: You should neither store nor reuse the reference to the iterable, nor to the individual cells.

postAttach

public void postAttach(Row row,
                       Iterable<FlyweightCell> attachedCells)

Description copied from interface: EscalatorUpdater

Called after attaching new cells to the escalator.

Specified by:

postAttach in interface EscalatorUpdater

Parameters:

row - Information about the row to which the cells were added. Note: You should not store nor reuse this reference.

attachedCells - A collection of cells that were attached. Note: You should neither store nor reuse the reference to the iterable, nor to the individual cells.

update

public void update(Row row,
                   Iterable<FlyweightCell> cellsToUpdate)

Description copied from interface: EscalatorUpdater

Renders a row contained in a row container.

Note: If rendering of cells is deferred (e.g. because asynchronous data retrieval), this method is responsible for explicitly displaying some placeholder data (empty content is valid). Because the cells (and rows) in an escalator are recycled, failing to reset a cell's presentation will lead to wrong data being displayed in the escalator.

For performance reasons, the escalator will never autonomously clear any data in a cell.

Specified by:

update in interface EscalatorUpdater

Parameters:

row - Information about the row that is being updated. Note: You should not store nor reuse this reference.

cellsToUpdate - A collection of cells that need to be updated. Note: You should neither store nor reuse the reference to the iterable, nor to the individual cells.

preDetach

public void preDetach(Row row,
                      Iterable<FlyweightCell> cellsToDetach)

Description copied from interface: EscalatorUpdater

Called before detaching cells from the escalator.

Specified by:

preDetach in interface EscalatorUpdater

Parameters:

row - Information about the row from which the cells will be removed. Note: You should not store nor reuse this reference.

cellsToDetach - A collection of cells that are about to be detached. Note: You should neither store nor reuse the reference to the iterable, nor to the individual cells.

postDetach

public void postDetach(Row row,
                       Iterable<FlyweightCell> detachedCells)

Description copied from interface: EscalatorUpdater

Called after detaching cells from the escalator.

Specified by:

postDetach in interface EscalatorUpdater

Parameters:

row - Information about the row from which the cells were removed. Note: You should not store nor reuse this reference.

detachedCells - A collection of cells that were detached. Note: You should neither store nor reuse the reference to the iterable, nor to the individual cells.