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<TITLE>Constraining JSlider Component Values to Tick Marks
(Java Developers Almanac Example)
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<B><A HREF="../javax.swing/pkg.html#JSlider">JSlider</A></B><font color="#666666" SIZE="-2">
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<h3>
e799.
Constraining JSlider Component Values to Tick Marks</h3>
By default, the slider can take on any value from the minimum to the
maximum. It is possible to configure the slider to allow only values
at tick marks (see <a href="../javax.swing/slider_SliderTicks.html" class="eglink"><font size="-1"><b>e797</b> Showing Tick Marks on a JSlider Component</font></a>). This
is done by calling <code>JSlider.setSnapToTicks(true)</code>.
<P> The slider's minimum and minor tick-mark spacing determines what
values are possible. For example, if the minimum is 3 and the minor
tick-mark spacing is 10, only the values, 3, 13, 23, and so forth, are allowed. If
a minor tick-mark spacing has not been set, the major tick-mark spacing is
used. If neither a minor nor a major tick mark spacing has been set, a
tick-mark spacing of 1 is assumed.
<P> Calling <code>setSnapToTicks()</code> also has the effect of causing
the slider's knob to snap to the closest tick mark whenever it is
dragged or programmatically moved to a spot between tick marks.
<pre>
// Create a horizontal slider that moves left-to-right
JSlider slider = new JSlider();
// Set major tick marks every 25 units
int tickSpacing = <font color="#0066ff"><i>25</i></font>;
slider.setMajorTickSpacing(tickSpacing);
// Set minor tick marks every 5 units
tickSpacing = <font color="#0066ff"><i>5</i></font>;
slider.setMinorTickSpacing(tickSpacing);
// Show tick marks
slider.setPaintTicks(true);
// Determine if currently snapping to tick marks
boolean b = slider.getSnapToTicks(); // false
// Snap to tick marks
slider.setSnapToTicks(true);
// Set to a spot between tick marks; the value moves to closest tick mark
slider.setValue(27);
int value = slider.getValue(); // 25
</pre>
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Related Examples
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e794. <a class="eglink" href="slider_Slider.html?l=rel">
Creating a JSlider Component
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e795. <a class="eglink" href="slider_SliderSet.html?l=rel">
Getting and Setting the Values of a JSlider Component
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e796. <a class="eglink" href="slider_SliderOrient.html?l=rel">
Setting the Orientation of a JSlider Component
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e797. <a class="eglink" href="slider_SliderTicks.html?l=rel">
Showing Tick Marks on a JSlider Component
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e798. <a class="eglink" href="slider_SliderLabels.html?l=rel">
Showing Tick-Mark Labels on a JSlider Component
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e800. <a class="eglink" href="slider_SliderEvt.html?l=rel">
Listening for Value Changes in a JSlider Component
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See also:
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Tool Tips
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UI Default Values
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