StackOverflow2013

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copied!<p>Why not making the granularity of the JSlider models finer by say having them go from 0 to 1000000, and having the sum be 1000000? With the proper <code>Dictionary</code> for the LabelTable, the user will probably not know that it doesn't go from 0 to 100.</p> <p>For example:</p> <pre><code>import java.awt.Dimension; import java.awt.GridLayout; import java.util.ArrayList; import java.util.Dictionary; import java.util.Hashtable; import java.util.List; import javax.swing.*; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; @SuppressWarnings("serial") public class LinkedSliders2 extends JPanel { private static final int SLIDER_COUNT = 5; public static final int SLIDER_MAX_VALUE = 1000; private static final int MAJOR_TICK_DIVISIONS = 5; private static final int MINOR_TICK_DIVISIONS = 20; private static final int LS_WIDTH = 700; private static final int LS_HEIGHT = 500; private JSlider[] sliders = new JSlider[SLIDER_COUNT]; private SliderGroup2 sliderGroup = new SliderGroup2(SLIDER_MAX_VALUE); public LinkedSliders2() { Dictionary<Integer, JComponent> myDictionary = new Hashtable<Integer, JComponent>(); for (int i = 0; i <= MAJOR_TICK_DIVISIONS; i++) { Integer key = i * SLIDER_MAX_VALUE / MAJOR_TICK_DIVISIONS; JLabel value = new JLabel(String.valueOf(i * 100 / MAJOR_TICK_DIVISIONS)); myDictionary.put(key, value); } setLayout(new GridLayout(0, 1)); for (int i = 0; i < sliders.length; i++) { sliders[i] = new JSlider(0, SLIDER_MAX_VALUE, SLIDER_MAX_VALUE / SLIDER_COUNT); sliders[i].setLabelTable(myDictionary ); sliders[i].setMajorTickSpacing(SLIDER_MAX_VALUE / MAJOR_TICK_DIVISIONS); sliders[i].setMinorTickSpacing(SLIDER_MAX_VALUE / MINOR_TICK_DIVISIONS); sliders[i].setPaintLabels(true); sliders[i].setPaintTicks(true); sliders[i].setPaintTrack(true); sliderGroup.addSlider(sliders[i]); add(sliders[i]); } } @Override public Dimension getPreferredSize() { return new Dimension(LS_WIDTH, LS_HEIGHT); } private static void createAndShowGui() { LinkedSliders2 mainPanel = new LinkedSliders2(); JFrame frame = new JFrame("LinkedSliders"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().add(mainPanel); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGui(); } }); } } class SliderGroup2 { private List<BoundedRangeModel> sliderModelList = new ArrayList<BoundedRangeModel>(); private ChangeListener changeListener = new SliderModelListener(); private int maxValueSum; public SliderGroup2(int maxValueSum) { this.maxValueSum = maxValueSum; } public void addSlider(JSlider slider) { BoundedRangeModel model = slider.getModel(); sliderModelList.add(model); model.addChangeListener(changeListener); } private class SliderModelListener implements ChangeListener { private boolean internalChange = false; @Override public void stateChanged(ChangeEvent cEvt) { if (!internalChange) { internalChange = true; BoundedRangeModel sourceModel = (BoundedRangeModel) cEvt.getSource(); int sourceValue = sourceModel.getValue(); int oldSumOfOtherSliders = 0; for (BoundedRangeModel model : sliderModelList) { if (model != sourceModel) { oldSumOfOtherSliders += model.getValue(); } } if (oldSumOfOtherSliders == 0) { for (BoundedRangeModel model : sliderModelList) { if (model != sourceModel) { model.setValue(1); } } internalChange = false; return; } int newSumOfOtherSliders = maxValueSum - sourceValue; for (BoundedRangeModel model : sliderModelList) { if (model != sourceModel) { long newValue = ((long) newSumOfOtherSliders * model .getValue()) / oldSumOfOtherSliders; model.setValue((int) newValue); } } int total = 0; for (BoundedRangeModel model : sliderModelList) { total += model.getValue(); } //!! System.out.printf("Total = %.0f%n", (double)total * 100 / LinkedSliders2.SLIDER_MAX_VALUE); internalChange = false; } } } } </code></pre> <p>Edited to have SliderGroup2 use a List of BoundedRangeModels rather than JSliders.</p>

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