source: java/main/src/main/java/com/framsticks/gui/controls/SliderControl.java @ 98

package com.framsticks.gui.controls;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.util.Hashtable;

import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.JTextField;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import org.apache.log4j.Logger;

import com.framsticks.params.types.DecimalParam;
import com.framsticks.params.types.FloatParam;
import com.framsticks.params.types.NumberParam;
import com.framsticks.util.lang.Numbers;
import com.framsticks.util.swing.Layout;

@SuppressWarnings("serial")
public class SliderControl extends TextControl {

        private static final Logger log = Logger.getLogger(SliderControl.class.getName());

        protected final JSlider slider;

        protected final JTextField text;

        /**
         * Division factor used to implement float value slider.
         */
        private final int div = 10;
        private JComponent changing = null;

        private Class<? extends Number> valueType;

        public SliderControl(NumberParam<?> param) {
                super(param);
                text = new JTextField();

                //TODO: that factor should be done as a constant
                this.setMaximumSize(new Dimension(Integer.MAX_VALUE, (int)(LINE_HEIGHT * 1.2)));

                // ComponentUI ui = UIManager.getUI(slider);
                // assert ui instanceof SliderUI;
                // SliderUI sui = (SliderUI) ui;
                // slider.setUI(sui);

                slider = new JSlider();

                slider.setPaintLabels(false);
                if (param instanceof DecimalParam) {
                        valueType = Integer.class;

                        int min = param.getMin(Integer.class);
                        int max = param.getMax(Integer.class);
                        slider.setMinimum(min);
                        slider.setMaximum(max);
                        if (param.getDef(Integer.class) != null) {
                                slider.setValue(param.getDef(Integer.class));
                        } else {
                                slider.setValue(min);
                        }
                        slider.setMajorTickSpacing((int) ((max - min) / 5));
                        slider.setMinorTickSpacing((int) ((max - min) / 10));
                } else if (param instanceof FloatParam) {
                        valueType = Double.class;

                        double min = param.getMin(Double.class) * div;
                        slider.setMinimum((int) min);
                        double max = param.getMax(Double.class) * div;
                        double diff = max - min;
                        slider.setMaximum((int) max);

                        Hashtable<Integer, java.awt.Component> labels = new Hashtable<Integer, java.awt.Component>();
                        int ticks = 6;
                        for (int i = 0; i <= ticks; i++) {
                                double val = (diff / ticks) * i + min;
                                String label = String.format("%1$.1f", (val / 10)).replace(",",
                                                ".");
                                labels.put((int) val, new JLabel(label, JLabel.CENTER));
                        }
                        slider.setLabelTable(labels);
                        slider.setMajorTickSpacing((int) (diff / 5));
                        slider.setMinorTickSpacing((int) (diff / 10));
                        if (param.getDef(Double.class) != null) {
                                double defaultValue = param.getDef(Double.class) * div;
                                slider.setValue((int) defaultValue);
                        }
                }
                slider.setPaintLabels(true);
                slider.setPaintTicks(true);

                this.setLayout(new BoxLayout(this, BoxLayout.LINE_AXIS));
                this.setAlignmentX(Box.CENTER_ALIGNMENT);
                this.setAlignmentY(Box.CENTER_ALIGNMENT);

                JPanel sliderPanel = new JPanel();
                // sliderPanel.setLayout(new BoxLayout(sliderPanel, BoxLayout.LINE_AXIS));


                Layout.fixComponentSize(text, new Dimension(90, Control.LINE_HEIGHT));
                text.setHorizontalAlignment(JSlider.CENTER);


                slider.addChangeListener(new ChangeListener() {
                        @Override
                        public void stateChanged(ChangeEvent e) {
                                if (changing != null) {
                                        return;
                                }
                                log.trace("changing " + getParam() + " with slider: " + slider.getValue());
                                changing = slider;
                                text.setText(convertFromSliderDomain(slider.getValue()).toString());
                                changing = null;
                        }
                });

                text.getDocument().addDocumentListener(createDocumentListener(new Runnable() {
                        @Override
                        public void run() {
                                if (changing != null) {
                                        return;
                                }
                                log.trace("changing " + getParam() + " with text: " + text.getText());
                                changing = text;
                                Integer i = convertToSliderDomain(convertTextToNumber());
                                if (i != null) {
                                        slider.setValue(i);
                                }
                                changing = null;
                                notifyOfChange();
                        }
                }));

                JPanel sVPanel = new JPanel();
                sVPanel.setLayout(new BoxLayout(sVPanel, BoxLayout.LINE_AXIS));
                sVPanel.add(text);
                Layout.copyComponentDimensions(sVPanel, text);

                JPanel sPanel = new JPanel();
                sPanel.setLayout(new BoxLayout(sPanel, BoxLayout.LINE_AXIS));

                sliderPanel.setLayout(new BorderLayout());
                sliderPanel.add(slider, BorderLayout.CENTER);
                sliderPanel.setMaximumSize(new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE));
                sliderPanel.setMinimumSize(new Dimension(0, 60));

                sPanel.add(sVPanel);
                sPanel.add(sliderPanel);

                this.add(sPanel);
        }

        @Override
        public NumberParam<?> getParam() {
                return (NumberParam<?>) param;
        }

        private Number convertFromSliderDomain(int value) {
                if (param instanceof DecimalParam) {
                        return value;
                }
                if (param instanceof FloatParam) {
                        return (double) value / (double) div;
                }
                return null;
        }

        private Integer convertToSliderDomain(Number value) {
                if (value == null) {
                        return null;
                }
                if (param instanceof DecimalParam) {
                        return (Integer) value;
                }
                if (param instanceof FloatParam) {
                        return (int) ((Double) value * div);
                }
                return null;
        }

        private Number convertTextToNumber() {
                return Numbers.cast(text.getText(), valueType);
        }

        @Override
        public void pushValueToUserInterfaceImpl(Object value) {
                if (value == null) {
                        return;
                }
                text.setText(value.toString());
        }

        @Override
        public Number pullValueFromUserInterface() {
                return convertTextToNumber();
        }

        @Override
        protected void updateEnabled(boolean enabled) {
                slider.setEnabled(enabled);
                text.setEnabled(enabled);
        }

}