4-4: Advanced Rules for Connector Maps in Visual C#.NET

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Table 4-4: Advanced Rules for Connector Maps
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R maps to C R maps to C1, C2, where C1 may inherit from C2
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The behavior is as described so far The author will be required to write custom code that decides which kind of connector to create when a link of the domain relationship is created Links of each domain relationship will cause the same kind of connector to be created By the rst rule, R1 links will be presented by C1 connectors, and R2 elements will be presented by C2 connectors However, any mappings between decorators speci ed in the mapping between R1 and C1 that are not remapped in the mapping between R2 and C2 will be used when using a C2 connector to represent an R2 link
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R1, R2 map to S, where R1 may inherit from R2 R2 inherits from R1, C2 inherits from C1, R1 maps to C1, R2 maps to C2
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Decorators
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Decorators decorate shapes and connectors with text or images (icons) This section details the de nition of decorators and decorator maps that determines how to use decorators to visualize data in the underlying model
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4: Pre sentation
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Kinds of Decorators There are three kinds of decorator: text, icon, and expand collapse Figure 4-26 shows the definition of ProjectShape, from the Issue Project DSL, which defines a text decorator and an expand collapse decorator, as well as the definition of InPortShape, from the component models language, which defines an icon decorator Corresponding instances of those shapes, as they would appear in a running designer, are also shown
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Figure 4-26: Different kinds of decorator
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A text decorator is used to decorate a shape or connector with text, and an icon decorator is used to decorate a shape or connector with an image (icon) When defining a text decorator, it is necessary to define the Default Text resource, which is the text displayed, unless it is dynamically updated through a decorator map When defining an icon decorator, it is necessary to define an Image resource that is the image displayed There is a range of settings that control the appearance of text displayed in a text decorator These are self-explanatory, although the omission of a Text Color property might seem to be an oversight In fact, the color of the
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De corators
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text displayed in a decorator is determined by the Text Color property on the diagram element that de nes the decorator, as we have seen earlier when discussing shapes For example, setting the Text Color property of IssueStateShape to Maroon results in the text of the NameDecorator, de ned by IssueStateShape, being rendered in maroon, as illustrated in Figure 4-27
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Figure 4-27: Definition of text color
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All kinds of shapes and connectors can de ne text and icon decorators However, an expand collapse decorator can only be added to compartment, geometry, or image shapes or ports It has a prede ned appearance and a special behavior when attached to compartment shapes all the compartments can be hidden (when collapsed) Additional code customization must be undertaken to add behavior to this decorator for non-compartment shapes
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Positioning Each decorator has a position with respect to the shape or connector it decorates Figure 4-28 shows the full range of positions available for shapes and connectors, respectively, which may be further re ned through offsets (expressed as inches) The positional information is set through the properties on the decorator
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OTL ITL OuterMiddleLeft OuterTopCenter InnerTopCenter ITR OuterMiddleRight OTR
SourceTop SourceBottom
TargetTop TargetBottom
Center
IBL OBL
InnerBottomCenter OuterBottomCenter
IBR OBR
Figure 4-28: All possible decorator positions
Only a subset of the positions is supported for certain kinds of shape; the possibilities are summarized in Table 4-5
Table 4-5: Decorator Positions for Different Kinds of Shapes
Geometry shape Image shape Compartment shape Port Swimlane
All All All outer decorators, InnerTopLeft, InnerTopCenter, InnerTopRight All InnerTopLeft, InnerTopCenter, InnerTopRight
Decorator Maps The appearance of a decorator in any particular instance of a shape may change dynamically as the information in the model changes This behavior is de ned in decorator maps that are part of shape and connector maps Figure 4-29 shows the decorator map for the Name decorator of the ProjectShape in the Issue Project DSL There are two parts: the Display property and the Visibility Filter If the decorator is a text decorator, then a Display property may be provided This is a domain property of the domain class being mapped to the shape (Project in this case), or a domain property of the domain class of an element navigated to by the Path to display property, if present