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Eclipse GEF
3.3

org.eclipse.gef.editpolicies
Class XYLayoutEditPolicy

java.lang.Object
  extended by

org.eclipse.gef.editpolicies.AbstractEditPolicy
      extended by

org.eclipse.gef.editpolicies.GraphicalEditPolicy
          extended by

org.eclipse.gef.editpolicies.LayoutEditPolicy
              extended by

org.eclipse.gef.editpolicies.ConstrainedLayoutEditPolicy
                  extended by
org.eclipse.gef.editpolicies.XYLayoutEditPolicy
All Implemented Interfaces:
EditPolicy, RequestConstants

public abstract class XYLayoutEditPolicy
extends ConstrainedLayoutEditPolicy

An EditPolicy for use with Figures in XYLayout. The constraint for XYLayout is a Rectangle. Created on :Nov 12, 2002

Since:
2.0

Field Summary
 
Fields inherited from interface org.eclipse.gef. EditPolicy
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
 
Fields inherited from interface org.eclipse.gef. RequestConstants
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
 
Constructor Summary
XYLayoutEditPolicy ()
           
 
Method Summary
protected  java.lang.Object getConstraintFor ( ChangeBoundsRequest request, GraphicalEditPart child)
          Overridden to prevent sizes from becoming too small, and to prevent preferred sizes from getting lost.
 java.lang.Object getConstraintFor ( Point p)
          Returns a Rectangle at the given Point with width and height of -1.
 java.lang.Object getConstraintFor ( Rectangle r)
          Returns a new Rectangle equivalent to the passed Rectangle.
protected   Rectangle getCurrentConstraintFor ( GraphicalEditPart child)
          Retrieves the child's current constraint from the LayoutManager.
protected   Point getLayoutOrigin ()
          Returns XYLayout.getOrigin(IFigure).
protected   Dimension getMinimumSizeFor ( GraphicalEditPart child)
          Determines the minimum size that the specified child can be resized to.
protected   XYLayout getXYLayout ()
           
 void setXyLayout ( XYLayout xyLayout)
           
protected  void showSizeOnDropFeedback ( CreateRequest request)
          Places the feedback rectangle where the User indicated.
 
Methods inherited from class org.eclipse.gef.editpolicies. ConstrainedLayoutEditPolicy
createAddCommand, createChangeConstraintCommand, createChangeConstraintCommand, createChildEditPolicy, getAddCommand, getAlignChildrenCommand, getCommand, getConstraintFor, getConstraintForClone, getMoveChildrenCommand, getResizeChildrenCommand, translateToModelConstraint
 
Methods inherited from class org.eclipse.gef.editpolicies. LayoutEditPolicy
activate, createListener, createSizeOnDropFeedback, deactivate, decorateChild, decorateChildren, eraseLayoutTargetFeedback, eraseSizeOnDropFeedback, eraseTargetFeedback, getCloneCommand, getCreateCommand, getCreationFeedbackOffset, getDeleteDependantCommand, getLayoutContainer, getOrphanChildrenCommand, getSizeOnDropFeedback, getSizeOnDropFeedback, getTargetEditPart, setListener, showLayoutTargetFeedback, showTargetFeedback, undecorateChild, undecorateChildren
 
Methods inherited from class org.eclipse.gef.editpolicies. GraphicalEditPolicy
addFeedback, getFeedbackLayer, getHostFigure, getLayer, removeFeedback
 
Methods inherited from class org.eclipse.gef.editpolicies. AbstractEditPolicy
debugFeedback, eraseSourceFeedback, getHost, setHost, showSourceFeedback, toString, understandsRequest
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

XYLayoutEditPolicy

public XYLayoutEditPolicy()
Method Detail

getConstraintFor

protected java.lang.Object getConstraintFor(
ChangeBoundsRequest request,
                                            
GraphicalEditPart child)
Overridden to prevent sizes from becoming too small, and to prevent preferred sizes from getting lost. If the Request is a MOVE, the existing width and height are preserved. During RESIZE, the new width and height have a lower bound determined by getMinimumSizeFor(GraphicalEditPart).

Overrides:
getConstraintFor in class ConstrainedLayoutEditPolicy
Parameters:
request - the ChangeBoundsRequest
child - the child EditPart for which the constraint should be generated
Returns:
the draw2d constraint
See Also:
ConstrainedLayoutEditPolicy.getConstraintFor(ChangeBoundsRequest, GraphicalEditPart)

getConstraintFor

public java.lang.Object getConstraintFor(
Point p)
Returns a Rectangle at the given Point with width and height of -1. XYLayout uses width or height equal to '-1' to mean use the figure's preferred size.

Specified by:
getConstraintFor in class ConstrainedLayoutEditPolicy
Parameters:
p - the input Point
Returns:
a Rectangle

getConstraintFor

public java.lang.Object getConstraintFor(
Rectangle r)
Returns a new Rectangle equivalent to the passed Rectangle.

Specified by:
getConstraintFor in class ConstrainedLayoutEditPolicy
Parameters:
r - the input Rectangle
Returns:
a copy of the input Rectangle

getCurrentConstraintFor

protected 
Rectangle getCurrentConstraintFor(
GraphicalEditPart child)
Retrieves the child's current constraint from the LayoutManager.

Parameters:
child - the child
Returns:
the current constraint

getLayoutOrigin

protected 
Point getLayoutOrigin()
Returns XYLayout.getOrigin(IFigure).

Overrides:
getLayoutOrigin in class ConstrainedLayoutEditPolicy
Returns:
Point
See Also:
ConstrainedLayoutEditPolicy.getLayoutOrigin()

getMinimumSizeFor

protected 
Dimension getMinimumSizeFor(
GraphicalEditPart child)
Determines the minimum size that the specified child can be resized to. Called from getConstraintFor(ChangeBoundsRequest, GraphicalEditPart). By default, a small Dimension is returned.

Parameters:
child - the child
Returns:
the minumum size

getXYLayout

protected 
XYLayout getXYLayout()
Returns:
the XYLayout layout manager set on the container

setXyLayout

public void setXyLayout(
XYLayout xyLayout)
Parameters:
xyLayout - The xyLayout to set.

showSizeOnDropFeedback

protected void showSizeOnDropFeedback(
CreateRequest request)
Places the feedback rectangle where the User indicated.

Overrides:
showSizeOnDropFeedback in class LayoutEditPolicy
Parameters:
request - the CreateRequest
See Also:
LayoutEditPolicy.showSizeOnDropFeedback(CreateRequest)

Eclipse GEF
3.3

Copyright (c) IBM Corp. and others 2000, 2007. All Rights Reserved.

 
 
  Published under the terms of the Eclipse Public License Version 1.0 ("EPL") Design by Interspire