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BoundedRangeModel (Java Platform SE 8 )

Defines the data model used by components like

s and

s. Defines four interrelated integer properties: minimum, maximum, extent and value. These four integers define two nested ranges like this:

 minimum <= value <= value+extent <= maximum
 

The outer range is

and the inner range is

. The inner range must lie within the outer one, i.e.

must be less than or equal to

and

must greater than or equal to

, and

must be greater than or equal to

. There are a few features of this model that one might find a little surprising. These quirks exist for the convenience of the Swing BoundedRangeModel clients, such as

and

.

• The minimum and maximum set methods "correct" the other three properties to accommodate their new value argument. For example setting the model's minimum may change its maximum, value, and extent properties (in that order), to maintain the constraints specified above.
• The value and extent set methods "correct" their argument to fit within the limits defined by the other three properties. For example if value == maximum, setExtent(10) would change the extent (back) to zero.
• The four BoundedRangeModel values are defined as Java Beans properties however Swing ChangeEvents are used to notify clients of changes rather than PropertyChangeEvents. This was done to keep the overhead of monitoring a BoundedRangeModel low. Changes are often reported at MouseDragged rates.

For an example of specifying custom bounded range models used by sliders, see Separable model architecture in A Swing Architecture Overview.

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