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GEF/New and Noteworthy/3.7

New and Noteworthy for Previous Versions

New and Noteworthy in GEF 3.7

New and noteworthy items are subsumed under the respective components of the GEF project. No distinction between end-user and developer-relevant changes has been made. Instead, everything that was regarded to be of interest is mentioned here.


Refactoring of Geometry API

Geometry API was refactored to guarantee consistency between integer-precision and double-precision version of Point/PrecisionPoint, Dimension/PrecisionDimension, and Rectangle/PrecisionRectangle. Synchronization between the still exposed integer-precision fields (x, y, width, height) and the no-longer exposed double-precision fields (preciseX, preciseY, preciseWidth, preciseHeight) is performed automatically by precision classes now, so clients may use the precision versions transparently, being no longer forced to perform a manual update of the respective fields. See 124904, 142628, and 271235 for details.


Refactoring of Layout Edit Policies

Layout edit policies have been refactored to remove duplicate code and allow better extensibility.

  • LayoutEditPolicy was enhanced by adding methods relevant for translations, used in all layout edit policies (removed duplicate code from subclasses):
    • Added getLayoutOrigin()(pulled up from ConstrainedLayoutEditPolicy)
    • Added translateFromAbsoluteToLayoutRelative(Translatable t) (synthesized from duplicated code spread throughout different layout edit policies)
    • Added translateFromLayoutRelativeToAbsolute(Translatable t) (synthesized from duplicated code spread throughout different layout edit policies)
  • ConstrainedLayoutEditPolicy was changed as follows:
    • Added createAddCommand(ChangeBoundsRequest request, EditPart child, Object constraint) as a replacement for createAddCommand(EditPart child, Object constraint), which was in turn deprecated (this is now handled similar as in case of change constraint commands).
    • Made createChangeConstraintCommand(EditPart child, Object constraint) concrete (empty body) and deprecated it to indicate that clients should instead createChangeConstraintCommand(ChangeBoundsRequest request, EditPart child, Object constraint)
    • Added getConstraintFor(Request request, GraphicalEditPart child, Rectangle rectangle), which subsumes the duplicate code fragments located in getConstraintFor(ChangeBoundsRequest request, GraphicalEditPart child) and getConstraintFor(CreateRequest request) before (both of these methods now delegate to the new method).
  • XYLayoutEditPolicy was changed to overwrite the
    • Replaced overwritten version of getConstraintFor(ChangeBoundsRequest request, GraphicalEditPart child) with an overwritten version of the newly introduced getConstraintFor(Request request, GraphicalEditPart child, Rectangle rect).

See 320852 for details.

Refactoring of Primary Drag Edit Policies

Primary drag edit policies were refactored to allow clients to easier provide custom handles and related select/drag/resize trackers.

  • NonResizableEditPolicy was changed by introducing hook methods to allow clients to customize the creation of handles and drag/select trackers used by them:
    • Added createDragHandle(List handles, int direction)
    • Added createMoveHandle(List handles, int direction)
    • Added createDragTracker(), which is used by createDragHandle(List handles, int direction) to construct the drag tracker for the created drag handle.
    • Added createSelectTracker(), which is used by createMoveHandle(List handles, int direction) to construct the select tracker for the created move handle.
  • ResizableEditPolicy was similarly changed by introducing the following methods:
    • Added createResizeHandle(List handles, int direction)
    • Added createResizeTracker(int), which is used by createResizeHandle(List handles, int direction) to create the resize tracker for the constructed resize handle.

The refactoring was performed in combination with the enhancement of ResizeTracker and CreationTool with support for constraints on resize and size-on-drop. See 67541 for details.

Enhancement of ResizeTracker and CreationTool

Extended ResizeTracker and CreationTool so that they now offer means to enforce certain constraints (by default, minimum and maximum size constraints) during resize as well as size-on-drop (dragging during creation). This was realized by adding methods to enforce size constraints:

  • ResizeTracker#enforceConstraintsForResize(ChangeBoundsRequest)
  • CreationTool#enforceConstraintsForSizeOnDropCreate(CreateRequest)

which are called whenever the source respectively target request is updated. By default, both ensure that minimum and maximum size constraints, which are inferred via respective hook methods:

  • ResizeTracker#getMaximumSizeFor(ChangeBoundsRequest)
  • ResizeTracker#getMinimumSizeFor(ChangeBoundsRequest)
  • CreationTool#getMaximumSizeFor(CreateRequest)
  • CreationTool#getMinimumSizeFor(CreateRequest)

Clients may overwrite the respective hook methods to infer maximum and minimum sizes for certain requests, or overwrite and adjust the enforcement of constraints as a whole (in case additional constraints have to be ensured). While the CreationTool could already be easily exchanged with a customized subclass by specifying a tool class upon construction of a CreationToolEntry, the ResizableEditPolicy was now enhanced to allow clients to specify a custom ResizeTracker as well, which will be used for all resize handles.

The logic example was enhanced to demonstrate how the new features can be used. See 67541 for details.


MarqueeSelectionTool was enhanced to now offer the following default marquee behaviors:

  • BEHAVIOR_CONNECTIONS_TOUCHED (supported since 3.1)
  • BEHAVIOR_NODES_CONTAINED (supported since 3.1, default behavior)
  • BEHAVIOR_NODES_CONTAINED_AND_RELATED_CONNECTIONS (supported since 3.1, formerly known as BEHAVIOR_NODES_AND_CONNECTIONS, which was in turn deprecated).

It was furthermore refactored to allow clients to customize marquee selection behavior via subclassing and overwriting one or more of the following methods:

  • performMarqueeSelect()
  • calculateMarqueeSelectedEditParts()
  • isMarqueeSelectable(EditPart)

The following methods are now also exposed (protected visibility) so clients can use access the current tool mode and the selection rectangle in their customization code:

  • getCurrentMarqueeSelectionRectangle()
  • getCurrentSelectionMode()

The logic example was enhanced to demonstrate all new marquee behaviors. See 67991 for details.


MarqueeToolEntry has been enhanced to use different icons dependent on the marquee behavior of the tool.


See 185960 for details.


Similar to MatchWidthAction and MatchHeightAction, a concrete MatchSizeAction MatchSizeAction.png was now made available.

The logic example was enhanced to demonstrate use of the new action. See 107916 for details.

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