Thumb Slider Example 2
// Example from http://www.crionics.com/products/opensource/faq/swing_ex/SwingExamples.html
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.BoundedRangeModel;
import javax.swing.DefaultBoundedRangeModel;
import javax.swing.Icon;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JSlider;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.MouseInputAdapter;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.basic.BasicSliderUI;
/**
* @version 1.0 9/3/99
*/
public class MThumbSliderExample2 extends JFrame {
public MThumbSliderExample2() {
super("MThumbSlider Example");
JSlider slider = new JSlider();
slider.setUI(new javax.swing.plaf.basic.BasicSliderUI(slider));
int n = 2;
MThumbSlider mSlider = new MThumbSlider(n);
mSlider.setValueAt(25, 0);
mSlider.setValueAt(75, 1);
mSlider.setUI(new BasicMThumbSliderUI());
getContentPane().setLayout(new FlowLayout());
getContentPane().add(slider);
getContentPane().add(mSlider);
}
public static void main(String args[]) {
try {
UIManager
.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
} catch (Exception ex) {
System.err.println("Error loading L&F: " + ex);
}
MThumbSliderExample2 f = new MThumbSliderExample2();
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
f.setSize(300, 100);
f.show();
}
}
class MThumbSlider extends JSlider {
protected int thumbNum;
protected BoundedRangeModel[] sliderModels;
protected Icon[] thumbRenderers;
protected Color[] fillColors;
protected Color trackFillColor;
private static final String uiClassID = "MThumbSliderUI";
public MThumbSlider(int n) {
createThumbs(n);
updateUI();
}
protected void createThumbs(int n) {
thumbNum = n;
sliderModels = new BoundedRangeModel[n];
thumbRenderers = new Icon[n];
fillColors = new Color[n];
for (int i = 0; i < n; i++) {
sliderModels[i] = new DefaultBoundedRangeModel(50, 0, 0, 100);
thumbRenderers[i] = null;
fillColors[i] = null;
}
}
public void updateUI() {
AssistantUIManager.setUIName(this);
super.updateUI();
/*
* // another way // updateLabelUIs();
* setUI(AssistantUIManager.createUI(this)); //setUI(new
* BasicMThumbSliderUI(this)); //setUI(new MetalMThumbSliderUI(this));
* //setUI(new MotifMThumbSliderUI(this));
*/
}
public String getUIClassID() {
return uiClassID;
}
public int getThumbNum() {
return thumbNum;
}
public int getValueAt(int index) {
return getModelAt(index).getValue();
}
public void setValueAt(int n, int index) {
getModelAt(index).setValue(n);
// should I fire?
}
public int getMinimum() {
return getModelAt(0).getMinimum();
}
public int getMaximum() {
return getModelAt(0).getMaximum();
}
public BoundedRangeModel getModelAt(int index) {
return sliderModels[index];
}
public Icon getThumbRendererAt(int index) {
return thumbRenderers[index];
}
public void setThumbRendererAt(Icon icon, int index) {
thumbRenderers[index] = icon;
}
public Color getFillColorAt(int index) {
return fillColors[index];
}
public void setFillColorAt(Color color, int index) {
fillColors[index] = color;
}
public Color getTrackFillColor() {
return trackFillColor;
}
public void setTrackFillColor(Color color) {
trackFillColor = color;
}
}
class BasicMThumbSliderUI extends BasicSliderUI implements
MThumbSliderAdditional {
MThumbSliderAdditionalUI additonalUi;
MouseInputAdapter mThumbTrackListener;
public static ComponentUI createUI(JComponent c) {
return new BasicMThumbSliderUI((JSlider) c);
}
public BasicMThumbSliderUI() {
super(null);
}
public BasicMThumbSliderUI(JSlider b) {
super(b);
}
public void installUI(JComponent c) {
additonalUi = new MThumbSliderAdditionalUI(this);
additonalUi.installUI(c);
mThumbTrackListener = createMThumbTrackListener((JSlider) c);
super.installUI(c);
}
public void uninstallUI(JComponent c) {
super.uninstallUI(c);
additonalUi.uninstallUI(c);
additonalUi = null;
mThumbTrackListener = null;
}
protected MouseInputAdapter createMThumbTrackListener(JSlider slider) {
return additonalUi.trackListener;
}
protected TrackListener createTrackListener(JSlider slider) {
return null;
}
protected ChangeListener createChangeListener(JSlider slider) {
return additonalUi.changeHandler;
}
protected void installListeners(JSlider slider) {
slider.addMouseListener(mThumbTrackListener);
slider.addMouseMotionListener(mThumbTrackListener);
slider.addFocusListener(focusListener);
slider.addComponentListener(componentListener);
slider.addPropertyChangeListener(propertyChangeListener);
slider.getModel().addChangeListener(changeListener);
}
protected void uninstallListeners(JSlider slider) {
slider.removeMouseListener(mThumbTrackListener);
slider.removeMouseMotionListener(mThumbTrackListener);
slider.removeFocusListener(focusListener);
slider.removeComponentListener(componentListener);
slider.removePropertyChangeListener(propertyChangeListener);
slider.getModel().removeChangeListener(changeListener);
}
protected void calculateGeometry() {
super.calculateGeometry();
additonalUi.calculateThumbsSize();
additonalUi.calculateThumbsLocation();
}
protected void calculateThumbLocation() {
}
Rectangle zeroRect = new Rectangle();
public void paint(Graphics g, JComponent c) {
Rectangle clip = g.getClipBounds();
thumbRect = zeroRect;
super.paint(g, c);
int thumbNum = additonalUi.getThumbNum();
Rectangle[] thumbRects = additonalUi.getThumbRects();
for (int i = thumbNum - 1; 0 <= i; i--) {
if (clip.intersects(thumbRects[i])) {
thumbRect = thumbRects[i];
paintThumb(g);
}
}
}
public void scrollByBlock(int direction) {
}
public void scrollByUnit(int direction) {
}
//
// MThumbSliderAdditional
//
public Rectangle getTrackRect() {
return trackRect;
}
public Dimension getThumbSize() {
return super.getThumbSize();
}
public int xPositionForValue(int value) {
return super.xPositionForValue(value);
}
public int yPositionForValue(int value) {
return super.yPositionForValue(value);
}
}
interface MThumbSliderAdditional {
public Rectangle getTrackRect();
public Dimension getThumbSize();
public int xPositionForValue(int value);
public int yPositionForValue(int value);
}
class MThumbSliderAdditionalUI {
MThumbSlider mSlider;
BasicSliderUI ui;
Rectangle[] thumbRects;
int thumbNum;
private transient boolean isDragging;
Icon thumbRenderer;
Rectangle trackRect;
ChangeHandler changeHandler;
TrackListener trackListener;
public MThumbSliderAdditionalUI(BasicSliderUI ui) {
this.ui = ui;
}
public void installUI(JComponent c) {
mSlider = (MThumbSlider) c;
thumbNum = mSlider.getThumbNum();
thumbRects = new Rectangle[thumbNum];
for (int i = 0; i < thumbNum; i++) {
thumbRects[i] = new Rectangle();
}
isDragging = false;
trackListener = new MThumbSliderAdditionalUI.TrackListener(mSlider);
changeHandler = new ChangeHandler();
}
public void uninstallUI(JComponent c) {
thumbRects = null;
trackListener = null;
changeHandler = null;
}
protected void calculateThumbsSize() {
Dimension size = ((MThumbSliderAdditional) ui).getThumbSize();
for (int i = 0; i < thumbNum; i++) {
thumbRects[i].setSize(size.width, size.height);
}
}
protected void calculateThumbsLocation() {
for (int i = 0; i < thumbNum; i++) {
if (mSlider.getSnapToTicks()) {
int tickSpacing = mSlider.getMinorTickSpacing();
if (tickSpacing == 0) {
tickSpacing = mSlider.getMajorTickSpacing();
}
if (tickSpacing != 0) {
int sliderValue = mSlider.getValueAt(i);
int snappedValue = sliderValue;
//int min = mSlider.getMinimumAt(i);
int min = mSlider.getMinimum();
if ((sliderValue - min) % tickSpacing != 0) {
float temp = (float) (sliderValue - min)
/ (float) tickSpacing;
int whichTick = Math.round(temp);
snappedValue = min + (whichTick * tickSpacing);
mSlider.setValueAt(snappedValue, i);
}
}
}
trackRect = getTrackRect();
if (mSlider.getOrientation() == JSlider.HORIZONTAL) {
int value = mSlider.getValueAt(i);
int valuePosition = ((MThumbSliderAdditional) ui)
.xPositionForValue(value);
thumbRects[i].x = valuePosition - (thumbRects[i].width / 2);
thumbRects[i].y = trackRect.y;
} else {
int valuePosition = ((MThumbSliderAdditional) ui)
.yPositionForValue(mSlider.getValueAt(i)); // need
thumbRects[i].x = trackRect.x;
thumbRects[i].y = valuePosition - (thumbRects[i].height / 2);
}
}
}
public int getThumbNum() {
return thumbNum;
}
public Rectangle[] getThumbRects() {
return thumbRects;
}
private static Rectangle unionRect = new Rectangle();
public void setThumbLocationAt(int x, int y, int index) {
Rectangle rect = thumbRects[index];
unionRect.setBounds(rect);
rect.setLocation(x, y);
SwingUtilities.computeUnion(rect.x, rect.y, rect.width, rect.height,
unionRect);
mSlider.repaint(unionRect.x, unionRect.y, unionRect.width,
unionRect.height);
}
public Rectangle getTrackRect() {
return ((MThumbSliderAdditional) ui).getTrackRect();
}
public class ChangeHandler implements ChangeListener {
public void stateChanged(ChangeEvent e) {
if (!isDragging) {
calculateThumbsLocation();
mSlider.repaint();
}
}
}
public class TrackListener extends MouseInputAdapter {
protected transient int offset;
protected transient int currentMouseX, currentMouseY;
protected Rectangle adjustingThumbRect = null;
protected int adjustingThumbIndex;
protected MThumbSlider slider;
protected Rectangle trackRect;
TrackListener(MThumbSlider slider) {
this.slider = slider;
}
public void mousePressed(MouseEvent e) {
if (!slider.isEnabled()) {
return;
}
currentMouseX = e.getX();
currentMouseY = e.getY();
slider.requestFocus();
for (int i = 0; i < thumbNum; i++) {
Rectangle rect = thumbRects[i];
if (rect.contains(currentMouseX, currentMouseY)) {
switch (slider.getOrientation()) {
case JSlider.VERTICAL:
offset = currentMouseY - rect.y;
break;
case JSlider.HORIZONTAL:
offset = currentMouseX - rect.x;
break;
}
isDragging = true;
slider.setValueIsAdjusting(true);
adjustingThumbRect = rect;
adjustingThumbIndex = i;
return;
}
}
}
public void mouseDragged(MouseEvent e) {
if (!slider.isEnabled() || !isDragging
|| !slider.getValueIsAdjusting()
|| adjustingThumbRect == null) {
return;
}
int thumbMiddle = 0;
currentMouseX = e.getX();
currentMouseY = e.getY();
Rectangle rect = thumbRects[adjustingThumbIndex];
trackRect = getTrackRect();
switch (slider.getOrientation()) {
case JSlider.VERTICAL:
int halfThumbHeight = rect.height / 2;
int thumbTop = e.getY() - offset;
int trackTop = trackRect.y;
int trackBottom = trackRect.y + (trackRect.height - 1);
thumbTop = Math.max(thumbTop, trackTop - halfThumbHeight);
thumbTop = Math.min(thumbTop, trackBottom - halfThumbHeight);
setThumbLocationAt(rect.x, thumbTop, adjustingThumbIndex);
thumbMiddle = thumbTop + halfThumbHeight;
mSlider.setValueAt(ui.valueForYPosition(thumbMiddle),
adjustingThumbIndex);
break;
case JSlider.HORIZONTAL:
int halfThumbWidth = rect.width / 2;
int thumbLeft = e.getX() - offset;
int trackLeft = trackRect.x;
int trackRight = trackRect.x + (trackRect.width - 1);
thumbLeft = Math.max(thumbLeft, trackLeft - halfThumbWidth);
thumbLeft = Math.min(thumbLeft, trackRight - halfThumbWidth);
setThumbLocationAt(thumbLeft, rect.y, adjustingThumbIndex);
thumbMiddle = thumbLeft + halfThumbWidth;
mSlider.setValueAt(ui.valueForXPosition(thumbMiddle),
adjustingThumbIndex);
break;
}
}
public void mouseReleased(MouseEvent e) {
if (!slider.isEnabled()) {
return;
}
offset = 0;
isDragging = false;
mSlider.setValueIsAdjusting(false);
mSlider.repaint();
}
public boolean shouldScroll(int direction) {
return false;
}
}
}
class AssistantUIManager {
public static ComponentUI createUI(JComponent c) {
String componentName = c.getClass().getName();
int index = componentName.lastIndexOf(".") + 1;
StringBuffer sb = new StringBuffer();
sb.append(componentName.substring(0, index));
//
// UIManager.getLookAndFeel().getName()
//
// [ Metal ] [ Motif ] [ Mac ] [ Windows ]
// Metal CDE/Motif Macintosh Windows
//
String lookAndFeelName = UIManager.getLookAndFeel().getName();
if (lookAndFeelName.startsWith("CDE/")) {
lookAndFeelName = lookAndFeelName.substring(4, lookAndFeelName
.length());
}
sb.append(lookAndFeelName);
sb.append(componentName.substring(index));
sb.append("UI");
ComponentUI componentUI = getInstance(sb.toString());
if (componentUI == null) {
sb.setLength(0);
sb.append(componentName.substring(0, index));
sb.append("Basic");
sb.append(componentName.substring(index));
sb.append("UI");
componentUI = getInstance(sb.toString());
}
return componentUI;
}
private static ComponentUI getInstance(String name) {
try {
return (ComponentUI) Class.forName(name).newInstance();
} catch (ClassNotFoundException ex) {
} catch (IllegalAccessException ex) {
ex.printStackTrace();
} catch (InstantiationException ex) {
ex.printStackTrace();
}
return null;
}
public static void setUIName(JComponent c) {
String key = c.getUIClassID();
String uiClassName = (String) UIManager.get(key);
if (uiClassName == null) {
String componentName = c.getClass().getName();
int index = componentName.lastIndexOf(".") + 1;
StringBuffer sb = new StringBuffer();
sb.append(componentName.substring(0, index));
String lookAndFeelName = UIManager.getLookAndFeel().getName();
if (lookAndFeelName.startsWith("CDE/")) {
lookAndFeelName = lookAndFeelName.substring(4, lookAndFeelName
.length());
}
sb.append(lookAndFeelName);
sb.append(key);
UIManager.put(key, sb.toString());
}
}
public AssistantUIManager() {
}
}
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