ch.uzh.ifi.attempto.echocomp
Class DelayedComponent

java.lang.Object
  nextapp.echo.app.Component
      nextapp.echo.app.Column
          ch.uzh.ifi.attempto.echocomp.DelayedComponent

All Implemented Interfaces:

java.io.Serializable, nextapp.echo.app.RenderIdSupport

public abstract class DelayedComponent
extends nextapp.echo.app.Column

This abstract class can be used to create components that are initialized asynchronously in the background. This is makes sense for components that require some time to create themselves (e.g. because of time expensive calculations). The possibly time consuming creation of the component can be done in a synchronized way so that at most one such creation process (per application instance) is running at a time.

Author:

Tobias Kuhn

See Also:

Serialized Form

Field Summary

Fields inherited from class nextapp.echo.app.Column

PROPERTY_BORDER, PROPERTY_CELL_SPACING, PROPERTY_INSETS

Fields inherited from class nextapp.echo.app.Component

CHILD_VISIBLE_CHANGED_PROPERTY, CHILDREN_CHANGED_PROPERTY, ENABLED_CHANGED_PROPERTY, FOCUS_NEXT_ID_CHANGED_PROPERTY, FOCUS_PREVIOUS_ID_CHANGED_PROPERTY, LAYOUT_DIRECTION_CHANGED_PROPERTY, LOCALE_CHANGED_PROPERTY, PROPERTY_BACKGROUND, PROPERTY_FONT, PROPERTY_FOREGROUND, PROPERTY_LAYOUT_DATA, STYLE_CHANGED_PROPERTY, STYLE_NAME_CHANGED_PROPERTY, VISIBLE_CHANGED_PROPERTY

Constructor Summary

DelayedComponent()
Creates a new delayed component with no temporary component.

DelayedComponent(boolean synchronize)
Creates a new delayed component with no temporary component.

DelayedComponent(nextapp.echo.app.Component tempComponent)
Creates a new delayed component with the given temporary component.

DelayedComponent(nextapp.echo.app.Component tempComponent, boolean synchronize)
Creates a new delayed component which shows the temporary component until the real component is ready.

Method Summary

void	finalizeAction() Override this method to run code in the appliction context (e.g.
abstract nextapp.echo.app.Component	initComponent() This method should contain the (possibly time-consuming) operations to create the actual GUI component.

Methods inherited from class nextapp.echo.app.Column

getBorder, getCellSpacing, getInsets, setBorder, setCellSpacing, setInsets

Methods inherited from class nextapp.echo.app.Component

add, add, addPropertyChangeListener, addPropertyChangeListener, dispose, firePropertyChange, get, getApplicationInstance, getBackground, getComponent, getComponent, getComponentCount, getComponents, getEventListenerList, getFocusNextId, getFocusPreviousId, getFont, getForeground, getId, getIndex, getLayoutData, getLayoutDirection, getLocale, getLocalStyle, getParent, getRenderId, getRenderIndexedProperty, getRenderIndexedProperty, getRenderLocale, getRenderProperty, getRenderProperty, getStyle, getStyleName, getVisibleComponent, getVisibleComponentCount, getVisibleComponents, hasEventListenerList, indexOf, init, isAncestorOf, isEnabled, isFocusTraversalParticipant, isRegistered, isRenderEnabled, isRenderVisible, isValidChild, isValidParent, isVisible, processInput, remove, remove, removeAll, removePropertyChangeListener, removePropertyChangeListener, set, setBackground, setComponents, setEnabled, setFocusNextId, setFocusPreviousId, setFocusTraversalParticipant, setFont, setForeground, setId, setIndex, setLayoutData, setLayoutDirection, setLocale, setRenderId, setStyle, setStyleName, setVisible, validate, verifyInput, visibleIndexOf

Methods inherited from class java.lang.Object

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

Constructor Detail

DelayedComponent

public DelayedComponent(nextapp.echo.app.Component tempComponent,
                        boolean synchronize)

Creates a new delayed component which shows the temporary component until the real component is ready.

Parameters:

tempComponent - The temporary component.

synchronize - Defines whether the calculation should be performed in a synchronized way.

DelayedComponent

public DelayedComponent(nextapp.echo.app.Component tempComponent)

Creates a new delayed component with the given temporary component. The calculation is not synchronized.

Parameters:

tempComponent - The temporary component.

DelayedComponent

public DelayedComponent(boolean synchronize)

Creates a new delayed component with no temporary component.

Parameters:

synchronize - Defines whether the calculation should be performed in a synchronized way.

DelayedComponent

public DelayedComponent()

Creates a new delayed component with no temporary component. The calculation is not synchronized.

Method Detail

initComponent

public abstract nextapp.echo.app.Component initComponent()

This method should contain the (possibly time-consuming) operations to create the actual GUI component. This operation will be performed asynchronously. As soon as it is finished, the temporary component (if present) is replaced by the component this method returns.

Returns:

The GUI component.

finalizeAction

public void finalizeAction()

Override this method to run code in the appliction context (e.g. for GUI changes) after the asynchronous operation has finished.