/*
Copyright 2008-2010 Gephi
Authors : Mathieu Bastian <mathieu.bastian@gephi.org>
Website : http://www.gephi.org
This file is part of Gephi.
Gephi is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
Gephi is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with Gephi. If not, see <http://www.gnu.org/licenses/>.
*/
package org.gephi.ui.components;
import com.sun.java.swing.plaf.windows.WindowsSliderUI;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.event.MouseEvent;
import java.awt.geom.Ellipse2D;
import javax.swing.JComponent;
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.plaf.ComponentUI;
import javax.swing.plaf.basic.BasicSliderUI;
import javax.swing.plaf.basic.BasicSliderUI.TrackListener;
/**
*
* @author Mathieu Bastian
*/
public class JRangeSlider extends JSlider {
/**
* Constructs a RangeSlider with default minimum and maximum values of 0
* and 100.
*/
public JRangeSlider() {
}
/**
* Constructs a RangeSlider with the specified default minimum and maximum
* values.
*/
public JRangeSlider(int min, int max) {
super(min, max);
}
/**
* Overrides the superclass method to install the UI delegate to draw two
* thumbs.
*/
@Override
public void updateUI() {
ComponentUI uiv = UIManager.getUI(this);
if (uiv instanceof WindowsSliderUI) {
uiv = new JRangeSliderWindowsUI(this);
} else {
uiv = new JRangeSliderBasicUI(this);
}
setUI(uiv);
// Update UI for slider labels. This must be called after updating the
// UI of the slider. Refer to JSlider.updateUI().
updateLabelUIs();
}
/**
* Returns the lower value in the range.
*/
@Override
public int getValue() {
return super.getValue();
}
/**
* Sets the lower value in the range.
*/
@Override
public void setValue(int value) {
int oldValue = getValue();
if (oldValue == value) {
return;
}
// Compute new value and extent to maintain upper value.
int oldExtent = getExtent();
int newValue = Math.min(Math.max(getMinimum(), value), oldValue + oldExtent);
int newExtent = oldExtent + oldValue - newValue;
// Set new value and extent, and fire a single change event.
getModel().setRangeProperties(newValue, newExtent, getMinimum(),
getMaximum(), getValueIsAdjusting());
}
/**
* Returns the upper value in the range.
*/
public int getUpperValue() {
return getValue() + getExtent();
}
/**
* Sets the upper value in the range.
*/
public void setUpperValue(int value) {
// Compute new extent.
int lowerValue = getValue();
int newExtent = Math.min(Math.max(0, value - lowerValue), getMaximum() - lowerValue);
// Set extent to set upper value.
setExtent(newExtent);
}
public void setValues(int low, int high) {
boolean changeLow = low != getValue();
boolean changeHigh = high != getUpperValue();
if (changeHigh || changeLow) {
int extent = getExtent();
extent = Math.min(Math.max(0, high - low), getMaximum() - low);
// Compute new value and extent to maintain upper value.
int oldExtent = getExtent();
int newValue = Math.min(Math.max(getMinimum(), low), getValue() + oldExtent);
// int newExtent = oldExtent + oldValue - newValue;
// Set new value and extent, and fire a single change event.
getModel().setRangeProperties(newValue, extent, getMinimum(),
getMaximum(), getValueIsAdjusting());
}
}
private static class JRangeSliderWindowsUI extends WindowsSliderUI {
/** Color of selected range. */
//private Color rangeColor = new Color(168,223,85,178);//nice green
private Color rangeColor = new Color(49, 220, 251, 178);//nice vista blue
/** Location and size of thumb for upper value. */
private Rectangle upperThumbRect;
/** Indicator that determines whether upper thumb is selected. */
private boolean upperThumbSelected;
/** Indicator set when lower thumb is being dragged. */
private transient boolean lowerDragging;
/** Indicator set when upper thumb is being dragged. */
private transient boolean upperDragging;
/**
* Constructs a RangeSliderUI for the specified slider component.
* @param b RangeSlider
*/
public JRangeSliderWindowsUI(JSlider slider) {
super(slider);
/*Color rColor = UIManager.getColor("Slider.focus");
if(rColor!=null) {
rangeColor = rColor;
}*/
}
/**
* Installs this UI delegate on the specified component.
*/
@Override
public void installUI(JComponent c) {
upperThumbRect = new Rectangle();
super.installUI(c);
}
/**
* Creates a listener to handle track events in the specified slider.
*/
@Override
protected TrackListener createTrackListener(JSlider slider) {
return new RangeTrackListener();
}
/**
* Creates a listener to handle change events in the specified slider.
*/
@Override
protected ChangeListener createChangeListener(JSlider slider) {
return new ChangeHandler();
}
/**
* Updates the dimensions for both thumbs.
*/
@Override
protected void calculateThumbSize() {
// Call superclass method for lower thumb size.
super.calculateThumbSize();
// Set upper thumb size.
upperThumbRect.setSize(thumbRect.width, thumbRect.height);
}
/**
* Updates the locations for both thumbs.
*/
@Override
protected void calculateThumbLocation() {
// Call superclass method for lower thumb location.
super.calculateThumbLocation();
// Adjust upper value to snap to ticks if necessary.
if (slider.getSnapToTicks()) {
int upperValue = slider.getValue() + slider.getExtent();
int snappedValue = upperValue;
int majorTickSpacing = slider.getMajorTickSpacing();
int minorTickSpacing = slider.getMinorTickSpacing();
int tickSpacing = 0;
if (minorTickSpacing > 0) {
tickSpacing = minorTickSpacing;
} else if (majorTickSpacing > 0) {
tickSpacing = majorTickSpacing;
}
if (tickSpacing != 0) {
// If it's not on a tick, change the value
if ((upperValue - slider.getMinimum()) % tickSpacing != 0) {
float temp = (float) (upperValue - slider.getMinimum()) / (float) tickSpacing;
int whichTick = Math.round(temp);
snappedValue = slider.getMinimum() + (whichTick * tickSpacing);
}
if (snappedValue != upperValue) {
slider.setExtent(snappedValue - slider.getValue());
}
}
}
// Calculate upper thumb location. The thumb is centered over its
// value on the track.
if (slider.getOrientation() == JSlider.HORIZONTAL) {
int upperPosition = xPositionForValue(slider.getValue() + slider.getExtent());
upperThumbRect.x = upperPosition - (upperThumbRect.width / 2);
upperThumbRect.y = trackRect.y;
} else {
int upperPosition = yPositionForValue(slider.getValue() + slider.getExtent());
upperThumbRect.x = trackRect.x;
upperThumbRect.y = upperPosition - (upperThumbRect.height / 2);
}
}
/**
* Paints the slider. The selected thumb is always painted on top of the
* other thumb.
*/
@Override
public void paint(Graphics g, JComponent c) {
super.paint(g, c);
Rectangle r = thumbRect;
thumbRect = upperThumbRect;
paintThumb(g);
thumbRect = r;
//paintThumb(g);
/*Rectangle clipRect = g.getClipBounds();
if (upperThumbSelected) {
// Paint lower thumb first, then upper thumb.
if (clipRect.intersects(thumbRect)) {
paintLowerThumb(g);
}
if (clipRect.intersects(upperThumbRect)) {
paintUpperThumb(g);
}
} else {
// Paint upper thumb first, then lower thumb.
if (clipRect.intersects(upperThumbRect)) {
paintUpperThumb(g);
}
if (clipRect.intersects(thumbRect)) {
paintLowerThumb(g);
}
}*/
}
/**
* Paints the track.
*/
@Override
public void paintTrack(Graphics g) {
// Draw track.
super.paintTrack(g);
Rectangle trackBounds = trackRect;
if (slider.getOrientation() == JSlider.HORIZONTAL) {
// Determine position of selected range by moving from the middle
// of one thumb to the other.
int lowerX = thumbRect.x + (thumbRect.width / 2);
int upperX = upperThumbRect.x + (upperThumbRect.width / 2);
// Determine track position.
int cy = (trackBounds.height / 2) - 2;
// Save color and shift position.
Color oldColor = g.getColor();
g.translate(trackBounds.x, trackBounds.y + cy);
// Draw selected range.
g.setColor(rangeColor);
for (int y = 0; y <= 3; y++) {
g.drawLine(lowerX - trackBounds.x, y, upperX - trackBounds.x, y);
}
// Restore position and color.
g.translate(-trackBounds.x, -(trackBounds.y + cy));
g.setColor(oldColor);
} else {
// Determine position of selected range by moving from the middle
// of one thumb to the other.
int lowerY = thumbRect.y + (thumbRect.height / 2);
int upperY = upperThumbRect.y + (upperThumbRect.height / 2);
// Determine track position.
int cx = (trackBounds.width / 2) - 2;
// Save color and shift position.
Color oldColor = g.getColor();
g.translate(trackBounds.x + cx, trackBounds.y);
// Draw selected range.
g.setColor(rangeColor);
for (int x = 0; x <= 3; x++) {
g.drawLine(x, lowerY - trackBounds.y, x, upperY - trackBounds.y);
}
// Restore position and color.
g.translate(-(trackBounds.x + cx), -trackBounds.y);
g.setColor(oldColor);
}
}
/**
* Paints the thumb for the lower value using the specified graphics object.
*/
private void paintLowerThumb(Graphics g) {
Rectangle knobBounds = thumbRect;
int w = knobBounds.width;
int h = knobBounds.height;
// Create graphics copy.
Graphics2D g2d = (Graphics2D) g.create();
// Create default thumb shape.
Shape thumbShape = createThumbShape(w - 1, h - 1);
// Draw thumb.
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.translate(knobBounds.x, knobBounds.y);
g2d.setColor(Color.CYAN);
g2d.fill(thumbShape);
g2d.setColor(Color.BLUE);
g2d.draw(thumbShape);
// Dispose graphics.
g2d.dispose();
}
/**
* Paints the thumb for the upper value using the specified graphics object.
*/
private void paintUpperThumb(Graphics g) {
Rectangle knobBounds = upperThumbRect;
int w = knobBounds.width;
int h = knobBounds.height;
// Create graphics copy.
Graphics2D g2d = (Graphics2D) g.create();
// Create default thumb shape.
Shape thumbShape = createThumbShape(w - 1, h - 1);
// Draw thumb.
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.translate(knobBounds.x, knobBounds.y);
g2d.setColor(Color.PINK);
g2d.fill(thumbShape);
g2d.setColor(Color.RED);
g2d.draw(thumbShape);
// Dispose graphics.
g2d.dispose();
}
/**
* Returns a Shape representing a thumb.
*/
private Shape createThumbShape(int width, int height) {
// Use circular shape.
Ellipse2D shape = new Ellipse2D.Double(0, 0, width, height);
return shape;
}
/**
* Sets the location of the upper thumb, and repaints the slider. This is
* called when the upper thumb is dragged to repaint the slider. The
* <code>setThumbLocation()</code> method performs the same task for the
* lower thumb.
*/
private void setUpperThumbLocation(int x, int y) {
Rectangle upperUnionRect = new Rectangle();
upperUnionRect.setBounds(upperThumbRect);
upperThumbRect.setLocation(x, y);
SwingUtilities.computeUnion(upperThumbRect.x, upperThumbRect.y, upperThumbRect.width, upperThumbRect.height, upperUnionRect);
slider.repaint(upperUnionRect.x, upperUnionRect.y, upperUnionRect.width, upperUnionRect.height);
}
/**
* Moves the selected thumb in the specified direction by a block increment.
* This method is called when the user presses the Page Up or Down keys.
*/
@Override
public void scrollByBlock(int direction) {
synchronized (slider) {
int blockIncrement = (slider.getMaximum() - slider.getMinimum()) / 10;
if (blockIncrement <= 0 && slider.getMaximum() > slider.getMinimum()) {
blockIncrement = 1;
}
int delta = blockIncrement * ((direction > 0) ? POSITIVE_SCROLL : NEGATIVE_SCROLL);
if (upperThumbSelected) {
int oldValue = ((JRangeSlider) slider).getUpperValue();
((JRangeSlider) slider).setUpperValue(oldValue + delta);
} else {
int oldValue = slider.getValue();
slider.setValue(oldValue + delta);
}
}
}
/**
* Moves the selected thumb in the specified direction by a unit increment.
* This method is called when the user presses one of the arrow keys.
*/
@Override
public void scrollByUnit(int direction) {
synchronized (slider) {
int delta = 1 * ((direction > 0) ? POSITIVE_SCROLL : NEGATIVE_SCROLL);
if (upperThumbSelected) {
int oldValue = ((JRangeSlider) slider).getUpperValue();
((JRangeSlider) slider).setUpperValue(oldValue + delta);
} else {
int oldValue = slider.getValue();
slider.setValue(oldValue + delta);
}
}
}
/**
* Listener to handle model change events. This calculates the thumb
* locations and repaints the slider if the value change is not caused by
* dragging a thumb.
*/
public class ChangeHandler implements ChangeListener {
public void stateChanged(ChangeEvent arg0) {
if (!lowerDragging && !upperDragging) {
calculateThumbLocation();
slider.repaint();
}
}
}
/**
* Listener to handle mouse movements in the slider track.
*/
public class RangeTrackListener extends TrackListener {
@Override
public void mousePressed(MouseEvent e) {
if (!slider.isEnabled()) {
return;
}
currentMouseX = e.getX();
currentMouseY = e.getY();
if (slider.isRequestFocusEnabled()) {
slider.requestFocus();
}
// Determine which thumb is pressed. If the upper thumb is
// selected (last one dragged), then check its position first;
// otherwise check the position of the lower thumb first.
boolean lowerPressed = false;
boolean upperPressed = false;
if (upperThumbSelected) {
if (upperThumbRect.contains(currentMouseX, currentMouseY)) {
upperPressed = true;
} else if (thumbRect.contains(currentMouseX, currentMouseY)) {
lowerPressed = true;
}
} else {
if (thumbRect.contains(currentMouseX, currentMouseY)) {
lowerPressed = true;
} else if (upperThumbRect.contains(currentMouseX, currentMouseY)) {
upperPressed = true;
}
}
// Handle lower thumb pressed.
if (lowerPressed) {
switch (slider.getOrientation()) {
case JSlider.VERTICAL:
offset = currentMouseY - thumbRect.y;
break;
case JSlider.HORIZONTAL:
offset = currentMouseX - thumbRect.x;
break;
}
upperThumbSelected = false;
lowerDragging = true;
return;
}
lowerDragging = false;
// Handle upper thumb pressed.
if (upperPressed) {
switch (slider.getOrientation()) {
case JSlider.VERTICAL:
offset = currentMouseY - upperThumbRect.y;
break;
case JSlider.HORIZONTAL:
offset = currentMouseX - upperThumbRect.x;
break;
}
upperThumbSelected = true;
upperDragging = true;
return;
}
upperDragging = false;
}
@Override
public void mouseReleased(MouseEvent e) {
lowerDragging = false;
upperDragging = false;
slider.setValueIsAdjusting(false);
super.mouseReleased(e);
}
@Override
public void mouseDragged(MouseEvent e) {
if (!slider.isEnabled()) {
return;
}
currentMouseX = e.getX();
currentMouseY = e.getY();
if (lowerDragging) {
slider.setValueIsAdjusting(true);
moveLowerThumb();
} else if (upperDragging) {
slider.setValueIsAdjusting(true);
moveUpperThumb();
}
}
@Override
public boolean shouldScroll(int direction) {
return false;
}
/**
* Moves the location of the lower thumb, and sets its corresponding
* value in the slider.
*/
private void moveLowerThumb() {
int thumbMiddle = 0;
switch (slider.getOrientation()) {
case JSlider.VERTICAL:
int halfThumbHeight = thumbRect.height / 2;
int thumbTop = currentMouseY - offset;
int trackTop = trackRect.y;
int trackBottom = trackRect.y + (trackRect.height - 1);
int vMax = yPositionForValue(slider.getValue() + slider.getExtent());
// Apply bounds to thumb position.
if (drawInverted()) {
trackBottom = vMax;
} else {
trackTop = vMax;
}
thumbTop = Math.max(thumbTop, trackTop - halfThumbHeight);
thumbTop = Math.min(thumbTop, trackBottom - halfThumbHeight);
setThumbLocation(thumbRect.x, thumbTop);
// Update slider value.
thumbMiddle = thumbTop + halfThumbHeight;
slider.setValue(valueForYPosition(thumbMiddle));
break;
case JSlider.HORIZONTAL:
int halfThumbWidth = thumbRect.width / 2;
int thumbLeft = currentMouseX - offset;
int trackLeft = trackRect.x;
int trackRight = trackRect.x + (trackRect.width - 1);
int hMax = xPositionForValue(slider.getValue() + slider.getExtent());
// Apply bounds to thumb position.
if (drawInverted()) {
trackLeft = hMax;
} else {
trackRight = hMax;
}
thumbLeft = Math.max(thumbLeft, trackLeft - halfThumbWidth);
thumbLeft = Math.min(thumbLeft, trackRight - halfThumbWidth);
setThumbLocation(thumbLeft, thumbRect.y);
// Update slider value.
thumbMiddle = thumbLeft + halfThumbWidth;
slider.setValue(valueForXPosition(thumbMiddle));
break;
default:
return;
}
}
/**
* Moves the location of the upper thumb, and sets its corresponding
* value in the slider.
*/
private void moveUpperThumb() {
int thumbMiddle = 0;
switch (slider.getOrientation()) {
case JSlider.VERTICAL:
int halfThumbHeight = thumbRect.height / 2;
int thumbTop = currentMouseY - offset;
int trackTop = trackRect.y;
int trackBottom = trackRect.y + (trackRect.height - 1);
int vMin = yPositionForValue(slider.getValue());
// Apply bounds to thumb position.
if (drawInverted()) {
trackTop = vMin;
} else {
trackBottom = vMin;
}
thumbTop = Math.max(thumbTop, trackTop - halfThumbHeight);
thumbTop = Math.min(thumbTop, trackBottom - halfThumbHeight);
setUpperThumbLocation(thumbRect.x, thumbTop);
// Update slider extent.
thumbMiddle = thumbTop + halfThumbHeight;
slider.setExtent(valueForYPosition(thumbMiddle) - slider.getValue());
break;
case JSlider.HORIZONTAL:
int halfThumbWidth = thumbRect.width / 2;
int thumbLeft = currentMouseX - offset;
int trackLeft = trackRect.x;
int trackRight = trackRect.x + (trackRect.width - 1);
int hMin = xPositionForValue(slider.getValue());
// Apply bounds to thumb position.
if (drawInverted()) {
trackRight = hMin;
} else {
trackLeft = hMin;
}
thumbLeft = Math.max(thumbLeft, trackLeft - halfThumbWidth);
thumbLeft = Math.min(thumbLeft, trackRight - halfThumbWidth);
setUpperThumbLocation(thumbLeft, thumbRect.y);
// Update slider extent.
thumbMiddle = thumbLeft + halfThumbWidth;
slider.setExtent(valueForXPosition(thumbMiddle) - slider.getValue());
break;
default:
return;
}
}
}
}
private static class JRangeSliderBasicUI extends BasicSliderUI {
/** Color of selected range. */
//private Color rangeColor = new Color(168,223,85,178);//nice green
private Color rangeColor = new Color(49, 220, 251, 178);//nice vista blue
/** Location and size of thumb for upper value. */
private Rectangle upperThumbRect;
/** Indicator that determines whether upper thumb is selected. */
private boolean upperThumbSelected;
/** Indicator set when lower thumb is being dragged. */
private transient boolean lowerDragging;
/** Indicator set when upper thumb is being dragged. */
private transient boolean upperDragging;
/**
* Constructs a RangeSliderUI for the specified slider component.
* @param b RangeSlider
*/
public JRangeSliderBasicUI(JSlider slider) {
super(slider);
/*Color rColor = UIManager.getColor("Slider.focus");
if(rColor!=null) {
rangeColor = rColor;
}*/
}
/**
* Installs this UI delegate on the specified component.
*/
@Override
public void installUI(JComponent c) {
upperThumbRect = new Rectangle();
super.installUI(c);
}
/**
* Creates a listener to handle track events in the specified slider.
*/
@Override
protected TrackListener createTrackListener(JSlider slider) {
return new RangeTrackListener();
}
/**
* Creates a listener to handle change events in the specified slider.
*/
@Override
protected ChangeListener createChangeListener(JSlider slider) {
return new ChangeHandler();
}
/**
* Updates the dimensions for both thumbs.
*/
@Override
protected void calculateThumbSize() {
// Call superclass method for lower thumb size.
super.calculateThumbSize();
// Set upper thumb size.
upperThumbRect.setSize(thumbRect.width, thumbRect.height);
}
/**
* Updates the locations for both thumbs.
*/
@Override
protected void calculateThumbLocation() {
// Call superclass method for lower thumb location.
super.calculateThumbLocation();
// Adjust upper value to snap to ticks if necessary.
if (slider.getSnapToTicks()) {
int upperValue = slider.getValue() + slider.getExtent();
int snappedValue = upperValue;
int majorTickSpacing = slider.getMajorTickSpacing();
int minorTickSpacing = slider.getMinorTickSpacing();
int tickSpacing = 0;
if (minorTickSpacing > 0) {
tickSpacing = minorTickSpacing;
} else if (majorTickSpacing > 0) {
tickSpacing = majorTickSpacing;
}
if (tickSpacing != 0) {
// If it's not on a tick, change the value
if ((upperValue - slider.getMinimum()) % tickSpacing != 0) {
float temp = (float) (upperValue - slider.getMinimum()) / (float) tickSpacing;
int whichTick = Math.round(temp);
snappedValue = slider.getMinimum() + (whichTick * tickSpacing);
}
if (snappedValue != upperValue) {
slider.setExtent(snappedValue - slider.getValue());
}
}
}
// Calculate upper thumb location. The thumb is centered over its
// value on the track.
if (slider.getOrientation() == JSlider.HORIZONTAL) {
int upperPosition = xPositionForValue(slider.getValue() + slider.getExtent());
upperThumbRect.x = upperPosition - (upperThumbRect.width / 2);
upperThumbRect.y = trackRect.y;
} else {
int upperPosition = yPositionForValue(slider.getValue() + slider.getExtent());
upperThumbRect.x = trackRect.x;
upperThumbRect.y = upperPosition - (upperThumbRect.height / 2);
}
}
/**
* Paints the slider. The selected thumb is always painted on top of the
* other thumb.
*/
@Override
public void paint(Graphics g, JComponent c) {
super.paint(g, c);
Rectangle r = thumbRect;
thumbRect = upperThumbRect;
paintThumb(g);
thumbRect = r;
//paintThumb(g);
/*Rectangle clipRect = g.getClipBounds();
if (upperThumbSelected) {
// Paint lower thumb first, then upper thumb.
if (clipRect.intersects(thumbRect)) {
paintLowerThumb(g);
}
if (clipRect.intersects(upperThumbRect)) {
paintUpperThumb(g);
}
} else {
// Paint upper thumb first, then lower thumb.
if (clipRect.intersects(upperThumbRect)) {
paintUpperThumb(g);
}
if (clipRect.intersects(thumbRect)) {
paintLowerThumb(g);
}
}*/
}
/**
* Paints the track.
*/
@Override
public void paintTrack(Graphics g) {
// Draw track.
super.paintTrack(g);
Rectangle trackBounds = trackRect;
if (slider.getOrientation() == JSlider.HORIZONTAL) {
// Determine position of selected range by moving from the middle
// of one thumb to the other.
int lowerX = thumbRect.x + (thumbRect.width / 2);
int upperX = upperThumbRect.x + (upperThumbRect.width / 2);
// Determine track position.
int cy = (trackBounds.height / 2) - 2;
// Save color and shift position.
Color oldColor = g.getColor();
g.translate(trackBounds.x, trackBounds.y + cy);
// Draw selected range.
g.setColor(rangeColor);
for (int y = 0; y <= 3; y++) {
g.drawLine(lowerX - trackBounds.x, y, upperX - trackBounds.x, y);
}
// Restore position and color.
g.translate(-trackBounds.x, -(trackBounds.y + cy));
g.setColor(oldColor);
} else {
// Determine position of selected range by moving from the middle
// of one thumb to the other.
int lowerY = thumbRect.y + (thumbRect.height / 2);
int upperY = upperThumbRect.y + (upperThumbRect.height / 2);
// Determine track position.
int cx = (trackBounds.width / 2) - 2;
// Save color and shift position.
Color oldColor = g.getColor();
g.translate(trackBounds.x + cx, trackBounds.y);
// Draw selected range.
g.setColor(rangeColor);
for (int x = 0; x <= 3; x++) {
g.drawLine(x, lowerY - trackBounds.y, x, upperY - trackBounds.y);
}
// Restore position and color.
g.translate(-(trackBounds.x + cx), -trackBounds.y);
g.setColor(oldColor);
}
}
/**
* Paints the thumb for the lower value using the specified graphics object.
*/
private void paintLowerThumb(Graphics g) {
Rectangle knobBounds = thumbRect;
int w = knobBounds.width;
int h = knobBounds.height;
// Create graphics copy.
Graphics2D g2d = (Graphics2D) g.create();
// Create default thumb shape.
Shape thumbShape = createThumbShape(w - 1, h - 1);
// Draw thumb.
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.translate(knobBounds.x, knobBounds.y);
g2d.setColor(Color.CYAN);
g2d.fill(thumbShape);
g2d.setColor(Color.BLUE);
g2d.draw(thumbShape);
// Dispose graphics.
g2d.dispose();
}
/**
* Paints the thumb for the upper value using the specified graphics object.
*/
private void paintUpperThumb(Graphics g) {
Rectangle knobBounds = upperThumbRect;
int w = knobBounds.width;
int h = knobBounds.height;
// Create graphics copy.
Graphics2D g2d = (Graphics2D) g.create();
// Create default thumb shape.
Shape thumbShape = createThumbShape(w - 1, h - 1);
// Draw thumb.
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.translate(knobBounds.x, knobBounds.y);
g2d.setColor(Color.PINK);
g2d.fill(thumbShape);
g2d.setColor(Color.RED);
g2d.draw(thumbShape);
// Dispose graphics.
g2d.dispose();
}
/**
* Returns a Shape representing a thumb.
*/
private Shape createThumbShape(int width, int height) {
// Use circular shape.
Ellipse2D shape = new Ellipse2D.Double(0, 0, width, height);
return shape;
}
/**
* Sets the location of the upper thumb, and repaints the slider. This is
* called when the upper thumb is dragged to repaint the slider. The
* <code>setThumbLocation()</code> method performs the same task for the
* lower thumb.
*/
private void setUpperThumbLocation(int x, int y) {
Rectangle upperUnionRect = new Rectangle();
upperUnionRect.setBounds(upperThumbRect);
upperThumbRect.setLocation(x, y);
SwingUtilities.computeUnion(upperThumbRect.x, upperThumbRect.y, upperThumbRect.width, upperThumbRect.height, upperUnionRect);
slider.repaint(upperUnionRect.x, upperUnionRect.y, upperUnionRect.width, upperUnionRect.height);
}
/**
* Moves the selected thumb in the specified direction by a block increment.
* This method is called when the user presses the Page Up or Down keys.
*/
@Override
public void scrollByBlock(int direction) {
synchronized (slider) {
int blockIncrement = (slider.getMaximum() - slider.getMinimum()) / 10;
if (blockIncrement <= 0 && slider.getMaximum() > slider.getMinimum()) {
blockIncrement = 1;
}
int delta = blockIncrement * ((direction > 0) ? POSITIVE_SCROLL : NEGATIVE_SCROLL);
if (upperThumbSelected) {
int oldValue = ((JRangeSlider) slider).getUpperValue();
((JRangeSlider) slider).setUpperValue(oldValue + delta);
} else {
int oldValue = slider.getValue();
slider.setValue(oldValue + delta);
}
}
}
/**
* Moves the selected thumb in the specified direction by a unit increment.
* This method is called when the user presses one of the arrow keys.
*/
@Override
public void scrollByUnit(int direction) {
synchronized (slider) {
int delta = 1 * ((direction > 0) ? POSITIVE_SCROLL : NEGATIVE_SCROLL);
if (upperThumbSelected) {
int oldValue = ((JRangeSlider) slider).getUpperValue();
((JRangeSlider) slider).setUpperValue(oldValue + delta);
} else {
int oldValue = slider.getValue();
slider.setValue(oldValue + delta);
}
}
}
/**
* Listener to handle model change events. This calculates the thumb
* locations and repaints the slider if the value change is not caused by
* dragging a thumb.
*/
public class ChangeHandler implements ChangeListener {
public void stateChanged(ChangeEvent arg0) {
if (!lowerDragging && !upperDragging) {
calculateThumbLocation();
slider.repaint();
}
}
}
/**
* Listener to handle mouse movements in the slider track.
*/
public class RangeTrackListener extends TrackListener {
@Override
public void mousePressed(MouseEvent e) {
if (!slider.isEnabled()) {
return;
}
currentMouseX = e.getX();
currentMouseY = e.getY();
if (slider.isRequestFocusEnabled()) {
slider.requestFocus();
}
// Determine which thumb is pressed. If the upper thumb is
// selected (last one dragged), then check its position first;
// otherwise check the position of the lower thumb first.
boolean lowerPressed = false;
boolean upperPressed = false;
if (upperThumbSelected) {
if (upperThumbRect.contains(currentMouseX, currentMouseY)) {
upperPressed = true;
} else if (thumbRect.contains(currentMouseX, currentMouseY)) {
lowerPressed = true;
}
} else {
if (thumbRect.contains(currentMouseX, currentMouseY)) {
lowerPressed = true;
} else if (upperThumbRect.contains(currentMouseX, currentMouseY)) {
upperPressed = true;
}
}
// Handle lower thumb pressed.
if (lowerPressed) {
switch (slider.getOrientation()) {
case JSlider.VERTICAL:
offset = currentMouseY - thumbRect.y;
break;
case JSlider.HORIZONTAL:
offset = currentMouseX - thumbRect.x;
break;
}
upperThumbSelected = false;
lowerDragging = true;
return;
}
lowerDragging = false;
// Handle upper thumb pressed.
if (upperPressed) {
switch (slider.getOrientation()) {
case JSlider.VERTICAL:
offset = currentMouseY - upperThumbRect.y;
break;
case JSlider.HORIZONTAL:
offset = currentMouseX - upperThumbRect.x;
break;
}
upperThumbSelected = true;
upperDragging = true;
return;
}
upperDragging = false;
}
@Override
public void mouseReleased(MouseEvent e) {
lowerDragging = false;
upperDragging = false;
slider.setValueIsAdjusting(false);
super.mouseReleased(e);
}
@Override
public void mouseDragged(MouseEvent e) {
if (!slider.isEnabled()) {
return;
}
currentMouseX = e.getX();
currentMouseY = e.getY();
if (lowerDragging) {
slider.setValueIsAdjusting(true);
moveLowerThumb();
} else if (upperDragging) {
slider.setValueIsAdjusting(true);
moveUpperThumb();
}
}
@Override
public boolean shouldScroll(int direction) {
return false;
}
/**
* Moves the location of the lower thumb, and sets its corresponding
* value in the slider.
*/
private void moveLowerThumb() {
int thumbMiddle = 0;
switch (slider.getOrientation()) {
case JSlider.VERTICAL:
int halfThumbHeight = thumbRect.height / 2;
int thumbTop = currentMouseY - offset;
int trackTop = trackRect.y;
int trackBottom = trackRect.y + (trackRect.height - 1);
int vMax = yPositionForValue(slider.getValue() + slider.getExtent());
// Apply bounds to thumb position.
if (drawInverted()) {
trackBottom = vMax;
} else {
trackTop = vMax;
}
thumbTop = Math.max(thumbTop, trackTop - halfThumbHeight);
thumbTop = Math.min(thumbTop, trackBottom - halfThumbHeight);
setThumbLocation(thumbRect.x, thumbTop);
// Update slider value.
thumbMiddle = thumbTop + halfThumbHeight;
slider.setValue(valueForYPosition(thumbMiddle));
break;
case JSlider.HORIZONTAL:
int halfThumbWidth = thumbRect.width / 2;
int thumbLeft = currentMouseX - offset;
int trackLeft = trackRect.x;
int trackRight = trackRect.x + (trackRect.width - 1);
int hMax = xPositionForValue(slider.getValue() + slider.getExtent());
// Apply bounds to thumb position.
if (drawInverted()) {
trackLeft = hMax;
} else {
trackRight = hMax;
}
thumbLeft = Math.max(thumbLeft, trackLeft - halfThumbWidth);
thumbLeft = Math.min(thumbLeft, trackRight - halfThumbWidth);
setThumbLocation(thumbLeft, thumbRect.y);
// Update slider value.
thumbMiddle = thumbLeft + halfThumbWidth;
slider.setValue(valueForXPosition(thumbMiddle));
break;
default:
return;
}
}
/**
* Moves the location of the upper thumb, and sets its corresponding
* value in the slider.
*/
private void moveUpperThumb() {
int thumbMiddle = 0;
switch (slider.getOrientation()) {
case JSlider.VERTICAL:
int halfThumbHeight = thumbRect.height / 2;
int thumbTop = currentMouseY - offset;
int trackTop = trackRect.y;
int trackBottom = trackRect.y + (trackRect.height - 1);
int vMin = yPositionForValue(slider.getValue());
// Apply bounds to thumb position.
if (drawInverted()) {
trackTop = vMin;
} else {
trackBottom = vMin;
}
thumbTop = Math.max(thumbTop, trackTop - halfThumbHeight);
thumbTop = Math.min(thumbTop, trackBottom - halfThumbHeight);
setUpperThumbLocation(thumbRect.x, thumbTop);
// Update slider extent.
thumbMiddle = thumbTop + halfThumbHeight;
slider.setExtent(valueForYPosition(thumbMiddle) - slider.getValue());
break;
case JSlider.HORIZONTAL:
int halfThumbWidth = thumbRect.width / 2;
int thumbLeft = currentMouseX - offset;
int trackLeft = trackRect.x;
int trackRight = trackRect.x + (trackRect.width - 1);
int hMin = xPositionForValue(slider.getValue());
// Apply bounds to thumb position.
if (drawInverted()) {
trackRight = hMin;
} else {
trackLeft = hMin;
}
thumbLeft = Math.max(thumbLeft, trackLeft - halfThumbWidth);
thumbLeft = Math.min(thumbLeft, trackRight - halfThumbWidth);
setUpperThumbLocation(thumbLeft, thumbRect.y);
// Update slider extent.
thumbMiddle = thumbLeft + halfThumbWidth;
slider.setExtent(valueForXPosition(thumbMiddle) - slider.getValue());
break;
default:
return;
}
}
}
}
}