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the case of a whole-shape move, the bounds rule is invoked once, and the lengths of the sides will not have changed In the case of a side-length adjustment, the bounds rule is invoked repeatedly, and the side lengths vary Within the rule, you can work out which case is happening by comparing the old and new side lengths; but remember that, as with any values of double or float types, it can be unreliable to compare for equality without some rounding
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Bounds Rules on Ports
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You can apply a bounds rule to a port, for example, to x or constrain it to a particular location on the parent shape Your rule overrides the normal port positioning constraints Notice the following: The property ParentShape navigates from the port shape to its parent It may be null when the child shape is rst created The location of the port shape that you should return is relative to the location of the parent This also applies to other kinds of child shape, although you can t create these without custom code in the present version of the DSL Tools This example comes from the Components sample that comes with the DSL Tools:
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public class InPortBoundsRules : BoundsRules { public override RectangleD GetCompliantBounds (ShapeElement shape, RectangleD proposedBounds) { InPortShape portShape = shape as InPortShape; ComponentShape parentShape = portShapeParentShape as ComponentShape; // on initial creation, there is no parent shape if (parentShape == null) return proposedBounds; double x = MathMin( MathMax(proposedBoundsLeft, proposedBoundsWidth * 05), parentShapeAbsoluteBoundingBoxWidth - proposedBoundsWidth * 15); double y = parentShapeAbsoluteBoundingBoxHeight - proposedBoundsHeight * 05; return new RectangleD(x, y, proposedBoundsWidth, proposedBoundsHeight); } }
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10: Advanced DSL Customization Undoable Changes
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You ll be familiar with the way Microsoft Word adjusts your quotation marks or indenting as you type Sometimes you really did want what you typed in the rst place, so you can undo the (sometimes irritating!) adjustment You may want to provide the same facility in your DSL The user moves the shape; you shift it to an approved place; then the user may press Ctrl+Z to undo your adjustment she really does want it where she put it, thank you To do this, override OnAbsoluteBoundsChanged in your Shape class This method is called after the close of the transaction in which the user s move happened Therefore, you must make your adjustment inside a new transaction This means that if the user calls undo afterwards, the rst undo will apply only to your adjustment, and another will undo the original move
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public override void OnAbsoluteBoundsChanged(AbsoluteBoundsChangedEventArgs e) { baseOnAbsoluteBoundsChanged(e); // Decide whether to adjust if (eNewAbsoluteBoundsHeight > eOldAbsoluteBoundsWidth) { // Now outside the original transaction; so open another using (Transaction t = thisStoreTransactionManagerBeginTransaction ("adjust shape")) { // Make adjustment // tCommit(); // Don't forget to commit // notice BoundsRules will be called again here } } }
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Summary of Change Propagation and Constraint Techniques Table 10-4 summarizes the techniques we have discussed for propagating changes and applying hard constraints
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Table 10-4: Change Propagation and Constraint Techniques Runs in originating transaction
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Technique
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Need to modify observed class
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Calculated properties Custom Storage
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OnValueChanged()
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* * Yes override No No
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Plain property values Plain property values Domain properties Shapes and connectors monitor MEL Change within the store Change outside the store UI mouse and keyboard events Changes after the transaction Shape bounds constraints Change propagation Changes outside the store; changes that should be undoable separately from the original action Changes inside the store Must register per instance Not prede ned properties like shape bounds
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OnAssociatedPropertyChanged()
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Rules
Store Event handlers NET events
OnXXX()
No No Yes override Yes initialize
No No No yes
Bounds Rules
* Calculated and Custom Storage properties don t by themselves require modi cation of the observed class, but you usually need to supply some means of calling NotifyValueChange() to propagate changes This could be done with a non-modifying rule, or it could be done using OnValueChanged(), as we illustrated earlier