com.google.gwt.cell.client

Class CompositeCell<C>

java.lang.Object

com.google.gwt.cell.client.AbstractCell<C>

com.google.gwt.cell.client.CompositeCell<C>

Type Parameters:

C - the type that this Cell represents

All Implemented Interfaces:

Cell<C>

public class CompositeCell<C>
extends AbstractCell<C>

A Cell that is composed of other Cells.

When this cell is rendered, it will render each component Cell inside a span. If the component Cell uses block level elements (such as a Div), the component cells will stack vertically.

Nested Class Summary

Nested classes/interfaces inherited from interface com.google.gwt.cell.client.Cell

Cell.Context

Constructor Summary

Constructors

Constructor and Description
CompositeCell(List<HasCell<C,?>> hasCells) Construct a new CompositeCell.

Method Summary

Modifier and Type	Method and Description
boolean	dependsOnSelection() Check if this cell depends on the selection state.
Set<String>	getConsumedEvents() Get the set of events that this cell consumes (see BrowserEvents for useful constants).
protected Element	getContainerElement(Element parent) Get the element that acts as the container for all children.
List<HasCell<C,?>>	getHasCells() Returns the readonly list of HasCell's that make up this composite.
boolean	handlesSelection() Check if this cell handles selection.
boolean	isEditing(Cell.Context context, Element parent, C value) Returns false.
void	onBrowserEvent(Cell.Context context, Element parent, C value, NativeEvent event, ValueUpdater<C> valueUpdater) Handle a browser event that took place within the cell.
void	render(Cell.Context context, C value, SafeHtmlBuilder sb) Render a cell as HTML into a SafeHtmlBuilder, suitable for passing to Element.setInnerHTML(String) on a container element.
protected <X> void	render(Cell.Context context, C value, SafeHtmlBuilder sb, HasCell<C,X> hasCell) Render the composite cell as HTML into a SafeHtmlBuilder, suitable for passing to Element.setInnerHTML(java.lang.String) on a container element.
boolean	resetFocus(Cell.Context context, Element parent, C value) Reset focus on the Cell.
void	setValue(Cell.Context context, Element parent, C object) This method may be used by cell containers to set the value on a single cell directly, rather than using Element.setInnerHTML(String).

Methods inherited from class com.google.gwt.cell.client.AbstractCell

onEnterKeyDown

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, toString

Constructor Detail

CompositeCell

public CompositeCell(List<HasCell<C,?>> hasCells)

Construct a new CompositeCell.

Parameters:

hasCells - the cells that makeup the composite

Method Detail

dependsOnSelection

public boolean dependsOnSelection()

Description copied from interface: Cell

Check if this cell depends on the selection state.

Specified by:

dependsOnSelection in interface Cell<C>

Overrides:

dependsOnSelection in class AbstractCell<C>

Returns:

true if dependent on selection, false if not

getConsumedEvents

public Set<String> getConsumedEvents()

Description copied from interface: Cell

Get the set of events that this cell consumes (see BrowserEvents for useful constants). The container that uses this cell should only pass these events to Cell.onBrowserEvent(Context, Element, Object, NativeEvent, ValueUpdater) when the event occurs.

The returned value should not be modified, and may be an unmodifiable set. Changes to the return value may not be reflected in the cell.

Specified by:

getConsumedEvents in interface Cell<C>

Overrides:

getConsumedEvents in class AbstractCell<C>

Returns:

the consumed events, or null if no events are consumed

See Also:

BrowserEvents

handlesSelection

public boolean handlesSelection()

Description copied from interface: Cell

Check if this cell handles selection. If the cell handles selection, then its container should not automatically handle selection.

Specified by:

handlesSelection in interface Cell<C>

Overrides:

handlesSelection in class AbstractCell<C>

Returns:

true if the cell handles selection, false if not

isEditing

public boolean isEditing(Cell.Context context,
                         Element parent,
                         C value)

Description copied from class: AbstractCell

Returns false. Subclasses that support editing should override this method to return the current editing status.

Specified by:

isEditing in interface Cell<C>

Overrides:

isEditing in class AbstractCell<C>

Parameters:

context - the Cell.Context of the cell

parent - the parent Element

value - the value associated with the cell

Returns:

true if the cell is in edit mode

onBrowserEvent

public void onBrowserEvent(Cell.Context context,
                           Element parent,
                           C value,
                           NativeEvent event,
                           ValueUpdater<C> valueUpdater)

Description copied from class: AbstractCell

Handle a browser event that took place within the cell. The default implementation returns null.

If you override this method to add support for events, remember to pass the event types that the cell expects into the constructor.

Specified by:

onBrowserEvent in interface Cell<C>

Overrides:

onBrowserEvent in class AbstractCell<C>

Parameters:

context - the Cell.Context of the cell

parent - the parent Element

value - the value associated with the cell

event - the native browser event

valueUpdater - a ValueUpdater, or null if not specified

render

public void render(Cell.Context context,
                   C value,
                   SafeHtmlBuilder sb)

Description copied from interface: Cell

Render a cell as HTML into a SafeHtmlBuilder, suitable for passing to Element.setInnerHTML(String) on a container element.

Note: If your cell contains natively focusable elements, such as buttons or input elements, be sure to set the tabIndex to -1 so that they do not steal focus away from the containing widget.

Specified by:

render in interface Cell<C>

Specified by:

render in class AbstractCell<C>

Parameters:

context - the Cell.Context of the cell

value - the cell value to be rendered

sb - the SafeHtmlBuilder to be written to

resetFocus

public boolean resetFocus(Cell.Context context,
                          Element parent,
                          C value)

Description copied from class: AbstractCell

Reset focus on the Cell. This method is called if the cell has focus when it is refreshed.

This method is a no-op and returns false. If your cell is editable or can be focused by the user, override this method to reset focus when the containing widget is refreshed.

Specified by:

resetFocus in interface Cell<C>

Overrides:

resetFocus in class AbstractCell<C>

Parameters:

context - the Cell.Context of the cell

parent - the parent Element

value - the value associated with the cell

Returns:

true if focus is taken, false if not

setValue

public void setValue(Cell.Context context,
                     Element parent,
                     C object)

Description copied from interface: Cell

This method may be used by cell containers to set the value on a single cell directly, rather than using Element.setInnerHTML(String). See Cell.setValue(Context, Element, Object) for a default implementation that uses Cell.render(Context, Object, SafeHtmlBuilder).

Specified by:

setValue in interface Cell<C>

Overrides:

setValue in class AbstractCell<C>

Parameters:

context - the Cell.Context of the cell

parent - the parent Element

object - the value associated with the cell

getHasCells

public List<HasCell<C,?>> getHasCells()

Returns the readonly list of HasCell's that make up this composite.

getContainerElement

protected Element getContainerElement(Element parent)

Get the element that acts as the container for all children. If children are added directly to the parent, the parent is the container. If children are added in a table row, the row is the parent.

Parameters:

parent - the parent element of the cell

Returns:

the container element

render

protected <X> void render(Cell.Context context,
                          C value,
                          SafeHtmlBuilder sb,
                          HasCell<C,X> hasCell)

Render the composite cell as HTML into a SafeHtmlBuilder, suitable for passing to Element.setInnerHTML(java.lang.String) on a container element.

Note: If your cell contains natively focusable elements, such as buttons or input elements, be sure to set the tabIndex to -1 so that they do not steal focus away from the containing widget.

Parameters:

context - the Context of the cell

value - the cell value to be rendered

sb - the SafeHtmlBuilder to be written to

hasCell - a HasCell instance containing the cells to be rendered within this cell