Package eu.webtoolkit.jwt

Class StdLayoutImpl

java.lang.Object

eu.webtoolkit.jwt.WObject

eu.webtoolkit.jwt.StdLayoutItemImpl

eu.webtoolkit.jwt.StdLayoutImpl

All Implemented Interfaces:

WLayoutImpl, WLayoutItemImpl

public abstract class StdLayoutImpl
extends StdLayoutItemImpl
implements WLayoutImpl

An abstract base class for implementing layout managers.

See Also:

• StdLayoutItemImpl
• WLayout

Nested Class Summary

Nested classes/interfaces inherited from class eu.webtoolkit.jwt.WObject

WObject.FormData

Constructor Summary

Constructors

Constructor	Description
StdLayoutImpl(WLayout layout)	Constructor.

Method Summary

Modifier and Type	Method	Description
protected static StdLayoutItemImpl	getImpl(WLayoutItem item)	Returns a WLayoutItem implementation.
protected WLayout	getLayout()	Returns the WLayout.
WLayoutItem	getLayoutItem()	Returns the WLayout as a WLayoutItem.
abstract boolean	isParentResized()	Called when the parent is resized.
abstract boolean	itemResized(WLayoutItem item)	Called when a WLayoutItem in the WLayout is resized.
void	update()	Updates the layout.
abstract void	updateDom(DomElement parent)	Updates the DomElements in the WLayout.

Methods inherited from class eu.webtoolkit.jwt.StdLayoutItemImpl

createDomElement, getContainer, getMaximumHeight, getMaximumWidth, getMinimumHeight, getMinimumWidth, getParentLayoutImpl

Methods inherited from class eu.webtoolkit.jwt.WObject

getId, getObjectName, remove, setFormData, setObjectName, tr

Methods inherited from class java.lang.Object

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

Methods inherited from interface eu.webtoolkit.jwt.WLayoutImpl

itemAdded, itemRemoved

Constructor Details

StdLayoutImpl

public StdLayoutImpl(WLayout layout)

Constructor.

Creates a new StdLayoutImpl for the given WLayout.

Method Details

updateDom

public abstract void updateDom(DomElement parent)

Updates the DomElements in the WLayout.

This function should update the DomElements in the WLayout. This means creating DomElements for newly added StdLayoutItemImpl, deleting DomElements from deleted StdLayoutItemImpl and updating the placement and size of the DomElements.

itemResized

public abstract boolean itemResized(WLayoutItem item)

Called when a WLayoutItem in the WLayout is resized.

When a WLayoutItem is resized, it may be necessary to update the whole layout. Items may have moved in such a way, that it would push other items of screen, requiring other items to adapt to it.

If it returns true, a subsequent updateDom() may be necessary.

isParentResized

public abstract boolean isParentResized()

Called when the parent is resized.

When the parent is resized, it may be necessary to update the whole layout. More or less items could not potentially fit in the layout, or the layout's boundaries may have changed.

If it returns true, a subsequent updateDom() may be necessary.

See Also:

• updateDom(DomElement parent)

getLayoutItem

public WLayoutItem getLayoutItem()

Returns the WLayout as a WLayoutItem.

Specified by:

getLayoutItem in class StdLayoutItemImpl

update

public void update()

Updates the layout.

By default, this will trigger a call to updateDom().

Note: Several calls to update() may happens before updateDom() is called.

Specified by:

update in interface WLayoutImpl

See Also:

• updateDom(DomElement parent)

getLayout

protected WLayout getLayout()

Returns the WLayout.

getImpl

protected static StdLayoutItemImpl getImpl(WLayoutItem item)

Returns a WLayoutItem implementation.

Returns a WLayoutItem implementation if the implementation is a subclass of StdLayoutItemImpl. Otherwise returns null.