De corators in C#

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De corators
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Figure 4-29: Definition of a decorator map
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In order to understand the visibility lter, let s consider an alternative way of showing a start state in the Issue State example Suppose that instead of having a separate start element connected to an issue state to indicate that the issue state is a start state, we de ne an icon decorator that should only appear in cases when the issue state is a start state To indicate that fact, we ll add a Boolean ag to IssueState called IsStartState That is, the de nitions of IssueState and IssueStateShape are as shown in Figure 4-30
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Figure 4-30: Definition of StartIcon and IsStartState
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We can now de ne a visibility lter in the map for the decorator StartIcon, as shown in Figure 4-31 This says that the StartIcon will only be visible when the domain property IsStartState is true The property can have any type enumerated properties are particularly useful for this By providing a path to the lter property, the property can be a domain property of another element navigable from the element mapped to the shape to which the decorator belongs Text decorators can also be ltered that is, you can set things up so that text appears only under certain circumstances And
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if you want to base visibility on more sophisticated logic, then you can do this by introducing a calculated property and using that in the visibility lter
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Figure 4-31: Decorator map showing visibility filter
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The result in the generated designer is illustrated in Figure 4-32, where only the state Raised has the Boolean ag Is Start State set to True
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Figure 4-32: Result of using a visibility filter
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Customizing the Graphical Notation in Code
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Customizing the Graphical Notation in Code
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We have already discussed the customization of shape and connector maps through code, as driven by the Boolean HasCustomXxx ags on shape maps This section describes a range of other useful customizations Most of the code in this section requires the following using statements:
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using MicrosoftVisualStudioModeling; using MicrosoftVisualStudioModelingDiagrams;
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Multiline Text Decorators There are occasions where you d like the text in a text decorator to wrap across multiple lines A common example is in the de nition of a comment box that is used to add text comment boxes on the design surface The inner decorators of a shape are implemented as shape elds By default, text shape elds only allow a single line of horizontal text However, we can change that by setting the appropriate properties To have the text wrap successfully within the containing shape, we also need to anchor the sides of the eld to the sides of the shape (Figure 4-33)
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Figure 4-33: Wrapped text inside a Comment Box
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public partial class CommentBoxShape { //Called once for each shape instance protected override void InitializeDecorators (IList<ShapeField> shapeFields, IList<Decorator> decorators) { // Be sure to call the base method baseInitializeDecorators(shapeFields, decorators); //Look up the shape field, which is called "Comment" TextField commentField = (TextField)ShapeElementFindShapeField (shapeFields, "Comment");
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// Allow multiple lines of text commentFieldDefaultMultipleLine = true; // Autosize not supported for multi-line fields commentFieldDefaultAutoSize = false; // Anchor the field slightly inside the container shape commentFieldAnchoringBehaviorClear(); commentFieldAnchoringBehavior SetLeftAnchor (AnchoringBehaviorEdgeLeft, 001); commentFieldAnchoringBehavior SetRightAnchor (AnchoringBehaviorEdgeRight, 001); commentFieldAnchoringBehavior SetTopAnchor (AnchoringBehaviorEdgeTop, 001); commentFieldAnchoringBehavior SetBottomAnchor(AnchoringBehaviorEdgeBottom, 001); } }
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Note that for this code to work, you must set Generates Double Derived to True for CommentBoxShape in the DSL de nition
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Variable Image Shape You can change the image displayed in an image decorator dependent upon data in the underlying model In the Circuit Diagrams DSL, the transistor shapes can have multiple orientations eight in all (some of them are shown in Figure 4-34)
Figure 4-34: Transistor shapes have multiple orientations
Rather than create a separate shape and toolbox tool for each orientation, we provide the user with one tool, one TransistorShape, and the ability to change the orientation of the image
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The eight images are selected depending on the value of two domain properties Flip and Rotate, which are on the TransistorShape They would be inappropriate on the Transistor domain class, since they are only concerned with presentation The wiring represented by the model would be the same no matter which way the components appear on the diagram We need to make our own custom ImageField class to perform the reorientation and then make sure that the eld implementing the image decorator is an instance of this class We ll call the new class ComponentImageField It overrides GetDisplayImage and uses the standard image rotation facilities found in SystemDrawing and caches the result to avoid computing every time
public class ComponentImageField : ImageField { public ComponentImageField(string tag) : base(tag) { } private RotateFlipType cachedRotateFlip = RotateFlipTypeRotateNoneFlipNone; private Image cachedImage = null; private static RotateFlipType[] rotateFlips = new RotateFlipType[] { RotateFlipTypeRotateNoneFlipNone, RotateFlipTypeRotate270FlipNone, RotateFlipTypeRotate180FlipNone, RotateFlipTypeRotate90FlipNone, RotateFlipTypeRotateNoneFlipX, RotateFlipTypeRotate90FlipX, RotateFlipTypeRotateNoneFlipY, RotateFlipTypeRotate90FlipY }; public override Image GetDisplayImage (ShapeElement parentShape) { ComponentShape componentShape = parentShape as ComponentShape; RotateFlipType rotateFlip = rotateFlips[componentShapeRotateFlip]; if (cachedImage == null || rotateFlip != cachedRotateFlip) { cachedImage = baseGetDisplayImage(parentShape); if (cachedImage != null && rotateFlip != RotateFlipTypeRotateNoneFlipNone) { cachedImage = (Image)cachedImageClone();