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Eclipse GEF 2.1 |
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A specialization of GraphicalEditPart
for representing
connections. ConnectionEditParts must join a source and target EditPart.
Its Figure is typically a line between two "nodes", with possible decorations on that
line.
In GEF, ConnectionEditParts are structural features of their source
and target "nodes", which are EditParts. However, the model does not have this
requirement. The application may store the connection model in any way, or there may
even be no real model. The burden is on the source and target EditPart to obtain their
appropriate connections in the methods getModelSourceConnections()
and getModelTargetConnections()
. How this is done is application specific.
Since ConnectionEditParts are features of their node EditPart, it is those EditParts
that must create and manage the connection. Creation is performed by whichever end
happens to "intialize" itself first. Therefore an end always looks first in the EditPartRegistry
to see if the
connection was already created by the other end.
ConnectionEditParts are EditParts, and therefore can have children. This is a common way to implement labels and other selectable decorations on connections. Similarly, a ConnectionEditPart can also be a "node", meaning it can serve as the source or target of some other ConnectionEditPart. This makes connection to connection possible.
IMPORTANT: The need to display something as a line does not automatically mean that a ConnectionEditPart is required. There are several situations in which ConnectionEditParts should not be used. You should use ConnectionEditParts in general if:
Field Summary |
Fields inherited from interface org.eclipse.gef.EditPart |
SELECTED, SELECTED_NONE, SELECTED_PRIMARY |
Method Summary | |
EditPart |
getSource()
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EditPart |
getTarget()
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void |
setSource(EditPart source)
Sets the source of this connection. |
void |
setTarget(EditPart target)
Sets thetarget of this connection. |
Methods inherited from interface org.eclipse.gef.GraphicalEditPart |
addNodeListener, getContentPane, getFigure, getSourceConnections, getTargetConnections, removeNodeListener, setLayoutConstraint |
Methods inherited from interface org.eclipse.gef.EditPart |
activate, addEditPartListener, addNotify, deactivate, eraseSourceFeedback, eraseTargetFeedback, getChildren, getCommand, getDragTracker, getEditPolicy, getModel, getParent, getRoot, getSelected, getTargetEditPart, getViewer, hasFocus, installEditPolicy, isActive, isSelectable, performRequest, refresh, removeEditPartListener, removeEditPolicy, removeNotify, setFocus, setModel, setParent, setSelected, showSourceFeedback, showTargetFeedback, understandsRequest |
Methods inherited from interface org.eclipse.core.runtime.IAdaptable |
getAdapter |
Method Detail |
public EditPart getSource()
public EditPart getTarget()
public void setSource(EditPart source)
source
- the source of this connectionpublic void setTarget(EditPart target)
target
- the target of this connection
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Eclipse GEF 2.1 |
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