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

Source Cross Reference Class Diagram Java Document (Java Doc)

org.eclipse.ui.contexts .IContextActivation

All known Subclasses:   org.eclipse.ui.internal.contexts .ContextActivation,
IContextActivation
public interface IContextActivation extends IEvaluationResultCache(Code)

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

Method Summary
public void clearActive()
     Clears the cached computation of the isActive method, if any.
public String getContextId()
     Returns the identifier of the context that is being activated.
public IContextService getContextService()
     Returns the context service from which this activation was requested.
public boolean isActive(IEvaluationContext context)
     Returns whether this context activation is currently active -- given the current state of the workbench.

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 IContextActivation instance. IEvaluationResultCache.clearResult

getContextId
public String getContextId()(Code)
Returns the identifier of the context that is being activated. The context identifier; never null.

getContextService
public IContextService getContextService()(Code)
Returns the context 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 context service; never null.

isActive
public boolean isActive(IEvaluationContext context)(Code)
Returns whether this context 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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