Graphical Editing Framework in Java

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CHAPTER 9 Graphical Editing Framework
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Creation
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Table 9-4 details the elements involved in creation interactions
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Table 9-4 Tools CreationTool Creation Interactions Requests REQ_CREATE Create Edit Policies and Roles CONTAINER_ROLE LAYOUT_ROLE Actions CopyTemplateAction PasteTemplateAction
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TREE_CONTAINER_ROLE ContainerEditPolicy LayoutEditPolicy
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A CreateRequest asks an EditPart to create a new child The ID REQ_CREATE identifies the request Creation can occur through three different methods: clicking, dragging, or pasting The request provides the location, object, and object type being created A CreationFactory provides the object and its type The request hides the factory and provides access to the created object directly, caching it in case multiple EditPolicies need access to the created object In some cases, the request contains a size attribute
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Producing CreateRequests
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The creation tool provides a loaded cursor mode that attempts to create an object at the mouse location when clicking If the mouse is clicked and dragged, the tool tracks the size of the rectangle defined by the user The creation tool can be placed on the palette using a CreationToolEntry When the mouse is released, the tool either repeats the process or switches back to the default tool Creation can also be performed using native drag-and-drop The drag source can be anything, but it is typically the PaletteViewer A palette entry that takes a template is added to the palette The TemplateTransfer is used to transfer the template, which is just an Object, from the drag source to the drop target A TemplateTransferDragSourceListener must be added to the PaletteViewer Similarly, the viewer must have a TemplateTransferDrop TargetListener Because a template is model specific, the application must extend the drop target listener to convert the template into a CreationFactory for the request A special palette entry called the CombinedTemplateCreationEntry supports both the creation tool and drag-and-drop styles of creation
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92 GEF
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Consuming CreateRequests
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The target EditPart is responsible for showing feedback and returning the command for creation GEF provides two types of policies for handling creation One type of policy is specific to the view in which creation occurs, either graphical or tree based This edit policy corresponds to either the LAYOUT_ROLE or the TREE_CONTAINER_ROLE The other type of edit policy is specific to only the model, in case applications want to separate the portion that is shared between graphical and nongraphical creation In most cases, any kind of shared logic is in the command implementations, making this type of policy unnecessary A LayoutEditPolicy handles the process of creation based on the container s layout manager For example, if XYLayout is being used, the resulting Command needs to associate an (x, y, w, h) constraint with the created child Layouts that don t use constraints require that the index of the drop location be determined GEF provides abstract policies for the basic layout types The TreeContainerEditPolicy supports creation in a tree-based viewer The policy is responsible for determining the index of creation and showing feedback The PasteTemplateAction can create objects without requiring the mouse This is important for accessibility The CopyTemplateAction is added to the palette When the user invokes this action, an internal mechanism copies the transfer so that it can be pasted in a viewer When the paste occurs, the PasteTemplateAction retrieves the template object, constructs a CreateRequest, and sends it to the selected EditPart The mouse location is not available in this interaction Paste is enabled only when the selection is exactly one EditPart When a creation command is redone, it must restore the original child that was created the first time it was executed If it creates a new object, subsequent commands will fail upon redo when they try to modify the originally created child
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Creation Sequence
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Using sequence diagrams, let s look at the sequence of events that occurs when the creation tool moves over the diagram surface using the mouse in GEF As you can see in Figure 9-14, as the mouse moves over the diagram, obtaining a command includes passing a request to the EditPart, which queries its EditPolicies The request obtains a new object from its factory, implying that a new model object is created and loaded into the creation tool as it is moved over the
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