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framework. The LocatorStrategy role model lets a locator handle delegate the computation of its position on the drawing area to a locator object. Instances of the core classes Figure, Drawing, DrawingView, DrawingEditor, and Tool collaborate with each other in several different ways. It does not cover all aspects of these classes, but only those relevant from the perspective of the Figure class hierarchy. The role-model-based description is an extension of the existing documentation, cast in a uniform way. A Client object asks the Manager object to return a specific Element object, here the currently active Tool object. The notable exception is the use of the Null Object pattern, which is purely class implementation oriented. In doing so, always argue why a particular theory or model is or is not appropriate for your own research. Tool is the State. 8.2.3 The Drawing and DrawingView classes This second part of the JHotDraw framework design discussion describes the Drawing, DrawingView, and related classes.

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It encapsulates all state specific behavior. It does not define any layout behavior. The last two responsibilities could only be found by reading the source code. Tool plays the role of the State. The drawing editor is the coordinating object that creates all command and tool objects. It is an instance of the Mediator pattern. Sample theoretical framework Key concepts mentioned in research questions and hypotheses or problem statement are defined.

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The FigureObserver role model lets Observer objects (Java Listeners) observe any figure Subject object. Do the check, generate your APA citations for free! Figure 8-10 shows these pattern instantiations as role models and adds non-pattern role models that represent the domain functionality. One possible reason is that they were simply forgotten. A figure sends out events to registered observers (Observer pattern). A handle adapts the operations to manipulate a figure to a common interface.". A traditional class model is used to show the structural relationships between objects and classes.

Design patterns are an important part of the documentation, but they do not capture all the collaborative behavior of objects. The code is annotated (using JavaDoc-style comments). General clients get and set figure attributes using generic key/value pairs (Property List pattern). DrawingEditor is a Mediator that decouples several participants." (Participant classes are Tool and DrawingView). Class relationships are described by role models. It is a judgement that a product or service feature, or the product of service itself, provides a pleasurable level of consumption-related fulfillment. However, they do not do this completely; they miss out collaboration tasks that cannot be described as pattern instances. Role modeling was easy to apply and did not contradict the original documentation in any way.

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