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    <p>"nichts einfacher als das" - dachte ... (insert name :-)</p> <p>Basically, all such enhanced functionality must be implemented in the model: for JSlider, that's a BoundedRangeModel. Implement/extend and enforce its value to respect the "combined" max. Something like </p> <pre><code>public static class LimitedBoundedRangeModel extends DefaultBoundedRangeModel { BoundedRangeModel limit; public LimitedBoundedRangeModel(BoundedRangeModel limit) { this.limit = limit; } /** * @inherited &lt;p&gt; */ @Override public void setRangeProperties(int newValue, int newExtent, int newMin, int newMax, boolean adjusting) { if (limit != null) { int combined = newValue + limit.getValue(); if (combined &gt; newMax) { newValue = newMax - limit.getValue(); } } super.setRangeProperties(newValue, newExtent, newMin, newMax, adjusting); } } // use LimitedBoundedRangeModel firstModel = new LimitedBoundedRangeModel(null); LimitedBoundedRangeModel secondModel = new LimitedBoundedRangeModel(firstModel); firstModel.limit= secondModel; JSlider first = new JSlider(firstModel); JSlider second = new JSlider(secondModel); </code></pre> <p>While simple (two dependents only) and crude (direct bidirectional coupling) and as such not really usable out in the wild, it should at least work ... but doesn't - one of those surprises which hit me from time to time ;-) The visual problem is the thumb-position:</p> <ul> <li>the combined max is respected when clicking to the right of the thumb: the thumb never moves over the threshhold</li> <li>when dragging, the thumb can be moved everywhere which might be expected, as the ui isn't aware of the model tweak - it knows only the "local" max</li> <li>on drag-end, the thumb remains at that invalid position.. which smells like a bug as now the thumb is out-off synch with the model </li> </ul> <p>The reason for this misbehaviour is that the changeListener in Handler: it doesn't recalculate its thumb position when dragging (which is okay). The subtle bug is, that the internal dragging flag is only reset <em>after</em> the model's adjusting property is reset, so missing the very last notification about the final value ...</p> <p>Hack around is to invoke the firing of an additional changeEvent, if the adjusting flag changes from true to false </p> <pre><code> boolean invoke = (adjusting != getValueIsAdjusting()) &amp;&amp; !adjusting; super.setRangeProperties(newValue, newExtent, newMin, newMax, adjusting); if (invoke) { SwingUtilities.invokeLater(new Runnable() { public void run() { fireStateChanged(); } }); } </code></pre>
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    1. CO+1 analysis! Peter: To get the desired effect, I think it will be necessary to implement a single, multi-thumb slider with a corresponding multi-range model. Here's a [guide](http://today.java.net/pub/a/today/2007/02/22/how-to-write-custom-swing-component.html) to the plumbing.
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    2. CO+1 stumbled across the very same issue some time back but couldn't it resolve yet. Btw: a more original quote would have been ["Nichts leichter als das, komm mit."](http://de.wikipedia.org/wiki/Piggeldy_und_Frederick) although maybe only known to few ;-).
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    3. CO@Howard you'r right - my memory rusted (und wird nicht mehr augefrischt seit Sandmännchen's Sendeplatz verlegt wurde :-)
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