Callback methods of IlvLinkShapePolicy

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In addition to the predefined link shape policies, the JViews Framework allows you to define your own link shape policies.

In general, when a method of IlvPolicyAwareLinkImage is called that may change the shape of the link, the following procedure is used by the policy-aware link image:

The link shape policy is temporary disabled to avoid endless recursion when calling methods on the link inside the link shape policy.
The link shape policy is asked whether the change is allowed. For instance, when the method link.insertPoint is called, the policy is asked by method policy.allowInsertPoint whether inserting the point is allowed.
If the change is allowed, it is done (for example, the point is inserted).
The “after change” callback method of the link shape policy is called. For instance, inside link.insertPoint , the method policy.afterInsertPoint is called. This allows the policy to react to the change.
The link shape policy is enabled again.
The method afterAny is called at the end. Since, at this point, the link shape policy is enabled, this method should not reshape the link any further. It can however perform cleanup operations.

Callback methods of IlvLinkShapePolicy used by IlvPolicyAwareLinkImage

Method of IlvPolicyAwareLinkImage	Test Method in IlvLinkShapePolicy	After Method in IlvLinkShapePolicy	Comment
setLinkShapePolicy		onInstall	Applied to the new policy
setLinkShapePolicy		onUninstall	Applied to the old policy
insertPoint	allowInsertPoint	afterInsertPoint
removePoint	allowRemovePoint	afterRemovePoint
movePoint	allowMovePoint	afterMovePoint
setIntermediateLinkPoints	allowSetIntermediateLinkPoints	afterSetIntermediateLinkPoints
applyTransform	allowApplyTransform	afterApplyTransform
		afterAdd	Applied after a link has been added to a grapher
		beforeRemove	Applied before a link is removed from a grapher
		afterFromNodeMoved	Applied when the source node of the link has been moved
		afterToNodeMoved	Applied when the destination node of the link has been moved
		afterAny	Applied after any of the methods mentioned above

Current section

Defining your own link shape policy