Graphical Editing Framework in Java

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CHAPTER 9 Graphical Editing Framework
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Activation is the final step in the process of adding a new EditPart to a diagram in which the EditPart observes changes in the model or supports editing For this, the EditPartactivate() method is invoked during creation and can be invoked later following a call to deactivate() The following occurs during activate(): 1 The EditPart begins to observe its model This is done by extending this method and registering listeners on the model element 2 The EditPart activates all its EditPolicies using the corresponding activate() method 3 The EditPart activates all its children 4 The EditPart notifies its listeners that it is active 5 The EditPart activates all its source ConnectionEditParts At this point, the EditPart is created and activated, ready for normal use; it can be selected, provide feedback, respond to requests, return commands, and so on The EditPart is deactivated upon deletion of the element or disposal of its viewer
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EditPart Disposal
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To complement the activate() method, EditParts provide a deactivate() method This method is also meant to be extended by your EditPart so that listeners registered by activate()can be unregistered Otherwise, deactivate() undoes all that activate() did, by default Although deactivation is guaranteed to occur for viewer disposal, the following also takes place for model element deletion Because addChild() was responsible for creating and initializing an EditPart, the AbstractEditPart removeChild() method is responsible for the cleanup This is its implementation, for reference:
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protected void removeChild(EditPart child) { AssertisNotNull(child); int index = getChildren()indexOf(child); if (index < 0) return; fireRemovingChild(child, index); if (isActive()) childdeactivate(); childremoveNotify(); removeChildVisual(child); childsetParent(null); getChildren()remove(child); }
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92 GEF
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As you can see, the process is nearly the reverse of the addChild() method Listeners are notified that the child is being removed, the deactivate() method is called, removeNotify() is called, its model and visual are unregistered, its parent is set to null, and its children are removed The EditPart is also removed as the source or target of any connections, although the connection itself is not removed unless both its source and target are set to null Note that EditParts are not recycled Even an Undo operation causes a new EditPart object to be created, so it s important to not reference an EditPart directly with a Command, for example
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925 Tools and the Palette
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Most interaction with GEF objects happens through tools selected from the palette Tools themselves function as state machines, responding to SWT events (mouse and keyboard) to perform actions such as showing or hiding feedback, updating the cursor, obtaining commands from EditParts, executing commands, and so on Actually, input flows from the viewer, to the EditDomain, to the active tool Only one active tool for all viewers in the EditDomain exists typically, the one selected in the palette The GEF palette is available as a standalone view (Window Show View Other General Palette) or within the editor itself The palette is an optional feature, although most GEF applications use it Figure 9-10 shows the FlyoutPaletteComposite used in the scenario diagram example
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Figure 9-10
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GEF palette
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CHAPTER 9 Graphical Editing Framework
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926 Interactions
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NOTE
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The content in this section is largely copied directly from the GEF programmer s guide and is provided here for convenience
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This section discusses the various types of interactions that are included in the framework and which parts of the framework are involved in supporting the interaction An interaction can be anything that affects the model or the UI state Many interactions are graphical, but some are not An interaction can include the following:
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Invoking some action (usually displayed on the toolbar, menu bar, or pop-up) Clicking on something Clicking and dragging something Hovering over something (pausing the mouse for a certain time) Dropping something dragged from another source (native drag-and-drop) Pressing certain keys
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This section discusses the participants involved in each interaction and what they do This can include the following:
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