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Java Source Code / Java Documentation » IDE Eclipse » ui workbench » org.eclipse.ui.handlers

Source Cross Reference Class Diagram Java Document (Java Doc)

org.eclipse.ui.handlers .IHandlerActivation

All known Subclasses:   org.eclipse.ui.internal.handlers .HandlerActivation,
IHandlerActivation
public interface IHandlerActivation extends IEvaluationResultCache,Comparable(Code)

A token representing the activation of a handler. This token can later be used to cancel that activation. Without this token, then handler will only become inactive if the component in which the handler was activated is destroyed.

This interface is not intended to be implemented or extended by clients.

since:
   3.1
See Also:   org.eclipse.ui.ISources
See Also:   org.eclipse.ui.ISourceProvider

Field Summary
final public static int ROOT_DEPTH
     The depth at which the root exists.

Method Summary
public void clearActive()
     Clears the cached computation of the isActive method, if any.
public String getCommandId()
     Returns the identifier of the command whose handler is being activated.
public int getDepth()
     Returns the depth at which this activation was created within the services hierarchy.
public IHandler getHandler()
     Returns the handler that should be activated.
public IHandlerService getHandlerService()
     Returns the handler service from which this activation was requested.
public boolean isActive(IEvaluationContext context)
     Returns whether this handler activation is currently active -- given the current state of the workbench.

Field Detail
ROOT_DEPTH
final public static int ROOT_DEPTH(Code)
The depth at which the root exists.
since:
   3.2

Method Detail
clearActive
public void clearActive()(Code)
Clears the cached computation of the isActive method, if any. This method is only intended for internal use. It provides a mechanism by which ISourceProvider events can invalidate state on a IHandlerActivation instance. IEvaluationResultCache.clearResult

getCommandId
public String getCommandId()(Code)
Returns the identifier of the command whose handler is being activated. The command identifier; never null.

getDepth
public int getDepth()(Code)
Returns the depth at which this activation was created within the services hierarchy. The root of the hierarchy is at a depth of 1. This is used as the final tie-breaker in the event that no other method can be used to determine a winner. The depth at which the handler was inserted into the serviceshierarchy; should be a positive integer.
since:
   3.2

getHandler
public IHandler getHandler()(Code)
Returns the handler that should be activated. The handler; may be null.

getHandlerService
public IHandlerService getHandlerService()(Code)
Returns the handler service from which this activation was requested. This is used to ensure that an activation can only be retracted from the same service which issued it. The handler service; never null.

isActive
public boolean isActive(IEvaluationContext context)(Code)
Returns whether this handler activation is currently active -- given the current state of the workbench. This method should cache its computation. The cache will be cleared by a call to clearActive.
Parameters:
  context - The context in which this state should be evaluated; must notbe null. true if the activation is currently active;false otherwise.IEvaluationResultCache.evaluate(IEvaluationContext)

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