Java Doc for LockingBehaviour.java in  » GIS » udig-1.1 » net » refractions » udig » tools » edit » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » udig 1.1 » net.refractions.udig.tools.edit 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


net.refractions.udig.tools.edit.LockingBehaviour

All known Subclasses:   net.refractions.udig.tools.edit.behaviour.MoveVertexBehaviour,  net.refractions.udig.tools.edit.behaviour.FreeHandPolygonDrawBehaviour,  net.refractions.udig.tools.edit.behaviour.ShapeCreationBehaviour,  net.refractions.udig.tools.edit.AdvancedFeaturesEventBehavior,  net.refractions.udig.tools.edit.OrderedCompositeEventBehavior,  net.refractions.udig.tools.edit.behaviour.SelectionBoxBehaviour,  net.refractions.udig.tools.edit.MutualExclusiveEventBehavior,
LockingBehaviour
public interface LockingBehaviour extends EventBehaviour(Code)
An extension interface allowing an EventBehaviour to Lock the tool handler.

Certain types of events need to be able to "lock" the tool handler so that it is the only event getting events until it "unlocks" the tool handler.

Example:

The Polygon tool has a BoxSelection behaviour that accepts drag events and draws a rectangle until the mouse is released (at that point it selects the vertices that are with the box).

The Polygon tool also has a move geometry behaviour that moves the geometry when the mouse is dragged over an EditGeom .

Given these two behaviours the following case can occur: The mouse is pressed (not over a geometry) and the BoxSelection behaviour starts drawing the selection box. The mouse drags over a Geometry and the MoveGeometry behaviour starts as well.

One solution is to put both behaviours in a net.refractions.udig.tools.edit.MutualExclusiveEventBehavior so that if the BoxSelection behaviour is running then the MoveGeometryBehaviour won't. However if the MoveGeometryBehaviour starts then the BoxSelection behaviour may as well.


author:
   jones
since:
   1.1.0




Method Summary
 ObjectgetKey(EditToolHandler handler)
     If the object returned by getKey() is the same as the object that the EditToolHandler has as its lock this object may unlock the EditToolHandler and is also permitted to run.
Parameters:
  handler - handler that is calling getKey.



Method Detail
getKey
Object getKey(EditToolHandler handler)(Code)
If the object returned by getKey() is the same as the object that the EditToolHandler has as its lock this object may unlock the EditToolHandler and is also permitted to run.
Parameters:
  handler - handler that is calling getKey. the object that this behaviour uses as a key.



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