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The problem is caused by the fact that in step 3, we reverted min to its old value, which is itself invalidThis can happen only during initialization because any other value that is stored will have been validated by the triggerThe fix is to revert min to its previous value if initialization has been completed, or to a known valid value if it has not Here is the final version of the triggers for the RandomNumbers class, which can be found in the file javafxtriggers/ConstraintTriggers5fx:
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public var min:Number = 1 on replace oldValue { if (min < 1 or (isInitialized(max) and min >= max)) { min = if (min >= 1) oldValue else 1; throw new IllegalArgumentException( "Invalid min value: {oldValue}"); } }; public var max:Number = 10 on replace oldValue { if (isInitialized(min) and max <= min) { max = if (min >= 10) oldValue else 10; throw new IllegalArgumentException( "Invalid max value: {oldValue}"); } };
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Unfortunately, we have to detect that min has not been initialized by testing for a valid valueWe can t use the isInitialized() function to do this it will return true in this case because the trigger is firing as a result of the initialization of the variableThis is the best that we can do in the current release of JavaFX
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Triggers and Sequences
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The syntax used to attach a trigger to a sequence variable is shown in the following example:
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var numbers = [010] on replace oldVals[lowhigh] = newVals { println("oldVals: {oldValstoString()}"); println("low = {low}, high = {high}"); println("newVals = {newValstoString()}"); println("Result = {numberstoString()}"); println("--------------------------"); }
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The identifiers used in the on replace clause are arbitrary, so you are not required to use the names shown hereTheir meanings are as follows:
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oldVals:The
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sequence as it was before a change was made
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low:An integer variable initialized to the index of the first element in the original sequence (in oldVals) that is affected by the change high:An integer variable initialized to the index of the last element in the original sequence (in oldVals) that is affected by the change
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sequence containing the elements that were added to or modified by the changeThe type of this sequence is the same as that of the sequence to which the trigger is attached In the previous code, the type would be Integer[]
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newVals:A
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We ll examine how to interpret the information provided by these variables using a series of examples based on the integer sequence and the trigger shown above, which prints all the values supplied to the trigger and the state of the sequence after each operation has been performedYou ll find the code in the file javafx/SequenceTriggersfx Notice that the trigger syntax does not provide anything that directly indicates whether an insertion, deletion, or replacement has been performed, but this can be inferred from the values passed to the trigger, as follows:
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if high < low, the operation was an insertionYou ll learn more about this in the Inserting Elements into a Sequence section, later in this chapter if high >= low and newVals is empty, the operation was a removal See the section Removing Elements from a Sequence, later in this chapter Otherwise, the operation was a replacement of one contiguous range of elements with anotherWe look at this case first
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Initially, the sequence numbers contains the integers from 0 through 10 in ascending order:
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numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
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We start by replacing the second element in the sequence with a new value:
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numbers[1] = 100;
The trigger for this operation produces the following output:
Replace element at index 1 with a new value oldVals: [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ] low = 1, high = 1 newVals = [ 100 ] Result = [ 0, 100, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]
As you can see, the variable oldVals contains the value of the sequence before the operation was performedThe variables low and high indicate which element of the sequence was affected by the operation Because low and high both have the value 1, we can tell that only one element was affected and that its value before the operation was 1, because this is value of the element at index 1 in the variable oldValsThe variable