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Java Source Code / Java Documentation » IDE Netbeans » performance » org.netbeans.actions.api 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.netbeans.actions.api.Engine

All known Subclasses:   org.netbeans.actions.engine.spi.AbstractEngine,
Engine
abstract public class Engine (Code)
The Engine is responsible for the relationship between the user context (selected object, window, whatever can influence action presence or enablement). By design it does not use a "push" model, but rather a "pull" model. That is, it, and only it, manages the state of the action presenters in the system. It is responsible for deciding when something needs to be displayed/painted/updated. The system can provide hints that now would be a good time to update something, but it will decide what to do.

For toolbar enablement, the intention is to implement handling enablement issues using a polling model - rather than trying to push updates for every change in context (lots of work and most of the time nothing changes), it will perform such updates in a timely way, but based on its analysis of the current circumstances. This may be influenced by such things as requests for visibility on its presenters, idle time in the AWT thread, a timer or the phase of the moon. In practice the visual result should be no different than that of a push model, except that it does far less work.

Note the complete absence of use of the listener pattern - this is by design.
author:
   Tim Boudreau





Method Summary
abstract public  ActionMapcreateActionMap()
    
abstract public  InputMapcreateInputMap(JComponent jc)
     Create an input map.
abstract public  JMenuBarcreateMenuBar()
    
abstract public  JPopupMenucreatePopupMenu()
    
abstract public  JToolBar[]createToolbars()
    
abstract public  voidrecommendUpdate()
     Method by which the infrastructure can suggest that now is a good time to update the state of toolbars, etc.
abstract public  voidsetContextProvider(ContextProvider ctx)
    



Method Detail
createActionMap
abstract public ActionMap createActionMap()(Code)



createInputMap
abstract public InputMap createInputMap(JComponent jc)(Code)
Create an input map. Will return an instance of ComponentInputMap (needed so the resulting input map can be used as a master input map for an application, i.e. set against WHEN_IN_FOCUSED_WINDOW).



createMenuBar
abstract public JMenuBar createMenuBar()(Code)



createPopupMenu
abstract public JPopupMenu createPopupMenu()(Code)



createToolbars
abstract public JToolBar[] createToolbars()(Code)



recommendUpdate
abstract public void recommendUpdate()(Code)
Method by which the infrastructure can suggest that now is a good time to update the state of toolbars, etc. Calling this method amounts to making a suggestion - like calling System.gc(), there is no guarantee that an implementation will immediately update its presenters.



setContextProvider
abstract public void setContextProvider(ContextProvider ctx)(Code)
Sets the ContextProvider that the engine will ask for the current user context (selected object, etc.) when it deems it necessary to update or instantiate presenter components



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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