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org.eclipse.gef.editpolicies
Class OrderedLayoutEditPolicy
java.lang.Object
org.eclipse.gef.editpolicies.AbstractEditPolicy
org.eclipse.gef.editpolicies.GraphicalEditPolicy
org.eclipse.gef.editpolicies.LayoutEditPolicy
org.eclipse.gef.editpolicies.OrderedLayoutEditPolicy
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All Implemented Interfaces:
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EditPolicy,
RequestConstants
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Direct Known Subclasses:
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FlowLayoutEditPolicy
- public abstract class OrderedLayoutEditPolicy
- extends
LayoutEditPolicy
A LayoutEditPolicy for use with LayoutManagers that take no constraints.
Such layout managers typically position children in coordinates based on their
order in
getChildren() . Therefore,
this EditPolicy must perform the inverse mapping. Given a mouse location from the User,
the policy must determine the index at which the child[ren] should be added/created.
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Since:
- 2.0
Fields inherited from interface org.eclipse.gef.
EditPolicy
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COMPONENT_ROLE,
CONNECTION_BENDPOINTS_ROLE,
CONNECTION_ENDPOINTS_ROLE,
CONNECTION_ROLE,
CONTAINER_ROLE,
DIRECT_EDIT_ROLE,
GRAPHICAL_NODE_ROLE,
LAYOUT_ROLE,
NODE_ROLE,
PRIMARY_DRAG_ROLE,
SELECTION_FEEDBACK_ROLE,
TREE_CONTAINER_ROLE
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Fields inherited from interface org.eclipse.gef.
RequestConstants
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REQ_ADD,
REQ_ALIGN,
REQ_ALIGN_CHILDREN,
REQ_CLONE,
REQ_CONNECTION_END,
REQ_CONNECTION_START,
REQ_CREATE,
REQ_CREATE_BENDPOINT,
REQ_DELETE,
REQ_DELETE_DEPENDANT,
REQ_DIRECT_EDIT,
REQ_MOVE,
REQ_MOVE_BENDPOINT,
REQ_MOVE_CHILDREN,
REQ_OPEN,
REQ_ORPHAN,
REQ_ORPHAN_CHILDREN,
REQ_RECONNECT_SOURCE,
REQ_RECONNECT_TARGET,
REQ_RESIZE,
REQ_RESIZE_CHILDREN,
REQ_SELECTION,
REQ_SELECTION_HOVER
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Methods inherited from class org.eclipse.gef.editpolicies.
LayoutEditPolicy
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activate,
createListener,
createSizeOnDropFeedback,
deactivate,
decorateChild,
decorateChildren,
eraseLayoutTargetFeedback,
eraseSizeOnDropFeedback,
eraseTargetFeedback,
getCloneCommand,
getCommand,
getCreateCommand,
getCreationFeedbackOffset,
getDeleteDependantCommand,
getLayoutContainer,
getOrphanChildrenCommand,
getSizeOnDropFeedback,
getSizeOnDropFeedback,
getTargetEditPart,
setListener,
showLayoutTargetFeedback,
showSizeOnDropFeedback,
showTargetFeedback,
undecorateChild,
undecorateChildren
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Methods inherited from class java.lang.Object
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
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OrderedLayoutEditPolicy
public OrderedLayoutEditPolicy()
createAddCommand
protected abstract
Command createAddCommand(
EditPart child,
EditPart after)
- Returns the
Command to add the specified child after a reference
EditPart . If the reference is null , the child should be added
as the first child.
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Parameters:
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child - the child being added -
after - null or a reference EditPart
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Returns:
- a Command to add the child
createChildEditPolicy
protected
EditPolicy createChildEditPolicy(
EditPart child)
- Since Ordered layouts generally don't use constraints, a
NonResizableEditPolicy
is used by default for children. Subclasses may override this method to supply a
different EditPolicy.
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Specified by:
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createChildEditPolicy
in class
LayoutEditPolicy
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Parameters:
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child - the child EditPart
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Returns:
- an EditPolicy to be installed as the
EditPolicy.PRIMARY_DRAG_ROLE
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See Also:
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LayoutEditPolicy.createChildEditPolicy(EditPart)
createMoveChildCommand
protected abstract
Command createMoveChildCommand(
EditPart child,
EditPart after)
- Returns the
Command to move the specified child before the given reference
EditPart . If the reference is null , the child should be
moved in front of all children.
A move is a change in the order of the children, which indirectly causes a change in
location on the screen.
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Parameters:
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child - the child being moved -
after - null or the EditPart that should be after (or to the right of)
the child being moved
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Returns:
- a Command to move the child
getAddCommand
protected
Command getAddCommand(
Request req)
- This method is overridden from the superclass to calculate the index at which
the children should be added. The index is determined by finding a reference EditPart,
and adding the new child[ren] after that reference part.
null is
used to indicate that the child[ren] should be added at the beginning.
Subclasses must override
createAddCommand(EditPart, EditPart) , and should not
override this method.
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Overrides:
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getAddCommand
in class
LayoutEditPolicy
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Parameters:
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req - the ADD Request
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Returns:
- A command to perform the ADD.
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See Also:
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LayoutEditPolicy.getAddCommand(Request)
getInsertionReference
protected abstract
EditPart getInsertionReference(
Request request)
- Calculates a reference
EditPart using the specified
Request . The EditPart returned is used to mark the index coming
after that EditPart. null is used to indicate the index that
comes after no EditPart, that is, it indicates the very last index.
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Parameters:
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request - the Request
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Returns:
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null or a reference EditPart
getMoveChildrenCommand
protected
Command getMoveChildrenCommand(
Request request)
- A move is interpreted here as a change in order of the children. This method obtains
the proper index, and then calls
createMoveChildCommand(EditPart, EditPart) ,
which subclasses must implement. Subclasses should not override this method.
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Specified by:
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getMoveChildrenCommand
in class
LayoutEditPolicy
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Parameters:
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request - the Request
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Returns:
- the Command to perform the move
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See Also:
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LayoutEditPolicy.getMoveChildrenCommand(Request)
Copyright (c) IBM Corp. and others 2000, 2007. All Rights Reserved.
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