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Java Standard Edition (SE)

BoundedRangeModel


javax.swing

Interface BoundedRangeModel

  • All Known Implementing Classes:
    DefaultBoundedRangeModel


    public interface BoundedRangeModel
    Defines the data model used by components like Sliders and ProgressBars. 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 minimum,maximum and the inner range is value,value+extent. The inner range must lie within the outer one, i.e. value must be less than or equal to maximum and value+extent must greater than or equal to minimum, and maximum must be greater than or equal to minimum. 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 Slider and ScrollBar.
    • 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.

    See Also:
    DefaultBoundedRangeModel
    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method and Description
      void addChangeListener(ChangeListener x)
      Adds a ChangeListener to the model's listener list.
      int getExtent()
      Returns the model's extent, the length of the inner range that begins at the model's value.
      int getMaximum()
      Returns the model's maximum.
      int getMinimum()
      Returns the minimum acceptable value.
      int getValue()
      Returns the model's current value.
      boolean getValueIsAdjusting()
      Returns true if the current changes to the value property are part of a series of changes.
      void removeChangeListener(ChangeListener x)
      Removes a ChangeListener from the model's listener list.
      void setExtent(int newExtent)
      Sets the model's extent.
      void setMaximum(int newMaximum)
      Sets the model's maximum to newMaximum.
      void setMinimum(int newMinimum)
      Sets the model's minimum to newMinimum.
      void setRangeProperties(int value, int extent, int min, int max, boolean adjusting)
      This method sets all of the model's data with a single method call.
      void setValue(int newValue)
      Sets the model's current value to newValue if newValue satisfies the model's constraints.
      void setValueIsAdjusting(boolean b)
      This attribute indicates that any upcoming changes to the value of the model should be considered a single event.
    • Method Detail

      • getMinimum

        int getMinimum()
        Returns the minimum acceptable value.
        Returns:
        the value of the minimum property
        See Also:
        setMinimum(int)
      • setMinimum

        void setMinimum(int newMinimum)
        Sets the model's minimum to newMinimum. The other three properties may be changed as well, to ensure that:
         minimum <= value <= value+extent <= maximum
         

        Notifies any listeners if the model changes.

        Parameters:
        newMinimum - the model's new minimum
        See Also:
        getMinimum(), addChangeListener(javax.swing.event.ChangeListener)
      • getMaximum

        int getMaximum()
        Returns the model's maximum. Note that the upper limit on the model's value is (maximum - extent).
        Returns:
        the value of the maximum property.
        See Also:
        setMaximum(int), setExtent(int)
      • setMaximum

        void setMaximum(int newMaximum)
        Sets the model's maximum to newMaximum. The other three properties may be changed as well, to ensure that
         minimum <= value <= value+extent <= maximum
         

        Notifies any listeners if the model changes.

        Parameters:
        newMaximum - the model's new maximum
        See Also:
        getMaximum(), addChangeListener(javax.swing.event.ChangeListener)
      • getValue

        int getValue()
        Returns the model's current value. Note that the upper limit on the model's value is maximum - extent and the lower limit is minimum.
        Returns:
        the model's value
        See Also:
        setValue(int)
      • setValue

        void setValue(int newValue)
        Sets the model's current value to newValue if newValue satisfies the model's constraints. Those constraints are:
         minimum <= value <= value+extent <= maximum
         
        Otherwise, if newValue is less than minimum it's set to minimum, if its greater than maximum then it's set to maximum, and if it's greater than value+extent then it's set to value+extent.

        When a BoundedRange model is used with a scrollbar the value specifies the origin of the scrollbar knob (aka the "thumb" or "elevator"). The value usually represents the origin of the visible part of the object being scrolled.

        Notifies any listeners if the model changes.

        Parameters:
        newValue - the model's new value
        See Also:
        getValue()
      • setValueIsAdjusting

        void setValueIsAdjusting(boolean b)
        This attribute indicates that any upcoming changes to the value of the model should be considered a single event. This attribute will be set to true at the start of a series of changes to the value, and will be set to false when the value has finished changing. Normally this allows a listener to only take action when the final value change in committed, instead of having to do updates for all intermediate values.

        Sliders and scrollbars use this property when a drag is underway.

        Parameters:
        b - true if the upcoming changes to the value property are part of a series
      • getValueIsAdjusting

        boolean getValueIsAdjusting()
        Returns true if the current changes to the value property are part of a series of changes.
        Returns:
        the valueIsAdjustingProperty.
        See Also:
        setValueIsAdjusting(boolean)
      • getExtent

        int getExtent()
        Returns the model's extent, the length of the inner range that begins at the model's value.
        Returns:
        the value of the model's extent property
        See Also:
        setExtent(int), setValue(int)
      • setExtent

        void setExtent(int newExtent)
        Sets the model's extent. The newExtent is forced to be greater than or equal to zero and less than or equal to maximum - value.

        When a BoundedRange model is used with a scrollbar the extent defines the length of the scrollbar knob (aka the "thumb" or "elevator"). The extent usually represents how much of the object being scrolled is visible. When used with a slider, the extent determines how much the value can "jump", for example when the user presses PgUp or PgDn.

        Notifies any listeners if the model changes.

        Parameters:
        newExtent - the model's new extent
        See Also:
        getExtent(), setValue(int)
      • setRangeProperties

        void setRangeProperties(int value,
                                int extent,
                                int min,
                                int max,
                                boolean adjusting)
        This method sets all of the model's data with a single method call. The method results in a single change event being generated. This is convenient when you need to adjust all the model data simultaneously and do not want individual change events to occur.
        Parameters:
        value - an int giving the current value
        extent - an int giving the amount by which the value can "jump"
        min - an int giving the minimum value
        max - an int giving the maximum value
        adjusting - a boolean, true if a series of changes are in progress
        See Also:
        setValue(int), setExtent(int), setMinimum(int), setMaximum(int), setValueIsAdjusting(boolean)


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