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PORestrict which values will be settleable in an javafx property?
 

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  1. PORestrict which values will be settleable in an javafx property?
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    <p>What's the best way to keep the value of a javafx Property within specific bounds?</p> <p><i>(Or - is this bad practice, existing any reason to never filter values wrapped by javafx properties?)</i></p> <p>Example1: avoid negative values in an IntegerProperty<br> Example2: keep the value of an IntegerProperty within the bounds of a List</p> <p>First idea: - override <code>IntegerPropertyBase.set(int)</code>. It's safe? Actually <code>setValue(int)</code> only calls <code>set(int)</code>, but - if this implementation one day changes - the control over the values set goes lost.</p> <p>Second idea: - override <code>IntegerPropertyBase.invalidate()</code>. But at this point the value already was set.</p> <p>Will it fit better to javafx properties throw an <code>IllegalArgumentException</code> (or an <code>ArrayIndexOutOfBoundsException</code>, if the wrapped value is the index of an array), or better refuse the value out of bounds, setting back the last value in bounds?</p> <p>Maybe like this:</p> <pre><code> class BoundedIntegerProperty extends IntegerPropertyBase { (...) int oldValue = defaultValueInBounds; boolean settingOldValue = false; public void invalidated() { if(!settingOldValue){ if(outOfBounds(get())){ settingOldValue = true; set(oldValue); } else { oldValue = get(); } } else settingOldValue = false; } } </code></pre> <p>Only throw an Exception in invalidated() for values out of bounds may keep the value of the property out of bounds.</p> <p>Have I overlooked anything in javafx properties provided to filter values?<br></p> <p>(If necessary, please help me improving the possibly bad english of this text...)</p>
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    1. USNic Stray
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    1. COIt might be simpler to validate the input before setting the property e.g. validate the text field, DB result or data from a file. I can't see any nice way of handling this, would you really want any #set() call to throw an exception?
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      1. USAndy Till
    2. COYou are true: it doesn't make sense to set, for example, an index for a list without have access to this list. But if I have access to the list, the setters for the index property may be in the list itself, and the property may be read only. In the List the setter of the index may throw exceptions if the index is out of bounds.
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