JDK8/Java8源码在线阅读
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package javax.swing.plaf.basic;
import java.awt.event.*;
import java.awt.*;
import java.beans.*;
import java.util.Dictionary;
import java.util.Enumeration;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.plaf.*;
import sun.swing.DefaultLookup;
import sun.swing.UIAction;
/**
* A Basic L&F implementation of SliderUI.
*
* @author Tom Santos
*/
public class BasicSliderUI extends SliderUI{
// Old actions forward to an instance of this.
private static final Actions SHARED_ACTION = new Actions();
public static final int POSITIVE_SCROLL = +1;
public static final int NEGATIVE_SCROLL = -1;
public static final int MIN_SCROLL = -2;
public static final int MAX_SCROLL = +2;
protected Timer scrollTimer;
protected JSlider slider;
protected Insets focusInsets = null;
protected Insets insetCache = null;
protected boolean leftToRightCache = true;
protected Rectangle focusRect = null;
protected Rectangle contentRect = null;
protected Rectangle labelRect = null;
protected Rectangle tickRect = null;
protected Rectangle trackRect = null;
protected Rectangle thumbRect = null;
protected int trackBuffer = 0; // The distance that the track is from the side of the control
private transient boolean isDragging;
protected TrackListener trackListener;
protected ChangeListener changeListener;
protected ComponentListener componentListener;
protected FocusListener focusListener;
protected ScrollListener scrollListener;
protected PropertyChangeListener propertyChangeListener;
private Handler handler;
private int lastValue;
// Colors
private Color shadowColor;
private Color highlightColor;
private Color focusColor;
/**
* Whther or not sameLabelBaselines is up to date.
*/
private boolean checkedLabelBaselines;
/**
* Whether or not all the entries in the labeltable have the same
* baseline.
*/
private boolean sameLabelBaselines;
protected Color getShadowColor() {
return shadowColor;
}
protected Color getHighlightColor() {
return highlightColor;
}
protected Color getFocusColor() {
return focusColor;
}
/**
* Returns true if the user is dragging the slider.
*
* @return true if the user is dragging the slider
* @since 1.5
*/
protected boolean isDragging() {
return isDragging;
}
/////////////////////////////////////////////////////////////////////////////
// ComponentUI Interface Implementation methods
/////////////////////////////////////////////////////////////////////////////
public static ComponentUI createUI(JComponent b) {
return new BasicSliderUI((JSlider)b);
}
public BasicSliderUI(JSlider b) {
}
public void installUI(JComponent c) {
slider = (JSlider) c;
checkedLabelBaselines = false;
slider.setEnabled(slider.isEnabled());
LookAndFeel.installProperty(slider, "opaque", Boolean.TRUE);
isDragging = false;
trackListener = createTrackListener( slider );
changeListener = createChangeListener( slider );
componentListener = createComponentListener( slider );
focusListener = createFocusListener( slider );
scrollListener = createScrollListener( slider );
propertyChangeListener = createPropertyChangeListener( slider );
installDefaults( slider );
installListeners( slider );
installKeyboardActions( slider );
scrollTimer = new Timer( 100, scrollListener );
scrollTimer.setInitialDelay( 300 );
insetCache = slider.getInsets();
leftToRightCache = BasicGraphicsUtils.isLeftToRight(slider);
focusRect = new Rectangle();
contentRect = new Rectangle();
labelRect = new Rectangle();
tickRect = new Rectangle();
trackRect = new Rectangle();
thumbRect = new Rectangle();
lastValue = slider.getValue();
calculateGeometry(); // This figures out where the labels, ticks, track, and thumb are.
}
public void uninstallUI(JComponent c) {
if ( c != slider )
throw new IllegalComponentStateException(
this + " was asked to deinstall() "
+ c + " when it only knows about "
+ slider + ".");
scrollTimer.stop();
scrollTimer = null;
uninstallDefaults(slider);
uninstallListeners( slider );
uninstallKeyboardActions(slider);
insetCache = null;
leftToRightCache = true;
focusRect = null;
contentRect = null;
labelRect = null;
tickRect = null;
trackRect = null;
thumbRect = null;
trackListener = null;
changeListener = null;
componentListener = null;
focusListener = null;
scrollListener = null;
propertyChangeListener = null;
slider = null;
}
protected void installDefaults( JSlider slider ) {
LookAndFeel.installBorder(slider, "Slider.border");
LookAndFeel.installColorsAndFont(slider, "Slider.background",
"Slider.foreground", "Slider.font");
highlightColor = UIManager.getColor("Slider.highlight");
shadowColor = UIManager.getColor("Slider.shadow");
focusColor = UIManager.getColor("Slider.focus");
focusInsets = (Insets)UIManager.get( "Slider.focusInsets" );
// use default if missing so that BasicSliderUI can be used in other
// LAFs like Nimbus
if (focusInsets == null) focusInsets = new InsetsUIResource(2,2,2,2);
}
protected void uninstallDefaults(JSlider slider) {
LookAndFeel.uninstallBorder(slider);
focusInsets = null;
}
protected TrackListener createTrackListener(JSlider slider) {
return new TrackListener();
}
protected ChangeListener createChangeListener(JSlider slider) {
return getHandler();
}
protected ComponentListener createComponentListener(JSlider slider) {
return getHandler();
}
protected FocusListener createFocusListener(JSlider slider) {
return getHandler();
}
protected ScrollListener createScrollListener( JSlider slider ) {
return new ScrollListener();
}
protected PropertyChangeListener createPropertyChangeListener(
JSlider slider) {
return getHandler();
}
private Handler getHandler() {
if (handler == null) {
handler = new Handler();
}
return handler;
}
protected void installListeners( JSlider slider ) {
slider.addMouseListener(trackListener);
slider.addMouseMotionListener(trackListener);
slider.addFocusListener(focusListener);
slider.addComponentListener(componentListener);
slider.addPropertyChangeListener( propertyChangeListener );
slider.getModel().addChangeListener(changeListener);
}
protected void uninstallListeners( JSlider slider ) {
slider.removeMouseListener(trackListener);
slider.removeMouseMotionListener(trackListener);
slider.removeFocusListener(focusListener);
slider.removeComponentListener(componentListener);
slider.removePropertyChangeListener( propertyChangeListener );
slider.getModel().removeChangeListener(changeListener);
handler = null;
}
protected void installKeyboardActions( JSlider slider ) {
InputMap km = getInputMap(JComponent.WHEN_FOCUSED, slider);
SwingUtilities.replaceUIInputMap(slider, JComponent.WHEN_FOCUSED, km);
LazyActionMap.installLazyActionMap(slider, BasicSliderUI.class,
"Slider.actionMap");
}
InputMap getInputMap(int condition, JSlider slider) {
if (condition == JComponent.WHEN_FOCUSED) {
InputMap keyMap = (InputMap)DefaultLookup.get(slider, this,
"Slider.focusInputMap");
InputMap rtlKeyMap;
if (slider.getComponentOrientation().isLeftToRight() ||
((rtlKeyMap = (InputMap)DefaultLookup.get(slider, this,
"Slider.focusInputMap.RightToLeft")) == null)) {
return keyMap;
} else {
rtlKeyMap.setParent(keyMap);
return rtlKeyMap;
}
}
return null;
}
/**
* Populates ComboBox's actions.
*/
static void loadActionMap(LazyActionMap map) {
map.put(new Actions(Actions.POSITIVE_UNIT_INCREMENT));
map.put(new Actions(Actions.POSITIVE_BLOCK_INCREMENT));
map.put(new Actions(Actions.NEGATIVE_UNIT_INCREMENT));
map.put(new Actions(Actions.NEGATIVE_BLOCK_INCREMENT));
map.put(new Actions(Actions.MIN_SCROLL_INCREMENT));
map.put(new Actions(Actions.MAX_SCROLL_INCREMENT));
}
protected void uninstallKeyboardActions( JSlider slider ) {
SwingUtilities.replaceUIActionMap(slider, null);
SwingUtilities.replaceUIInputMap(slider, JComponent.WHEN_FOCUSED,
null);
}
/**
* Returns the baseline.
*
* @throws NullPointerException {@inheritDoc}
* @throws IllegalArgumentException {@inheritDoc}
* @see javax.swing.JComponent#getBaseline(int, int)
* @since 1.6
*/
public int getBaseline(JComponent c, int width, int height) {
super.getBaseline(c, width, height);
if (slider.getPaintLabels() && labelsHaveSameBaselines()) {
FontMetrics metrics = slider.getFontMetrics(slider.getFont());
Insets insets = slider.getInsets();
Dimension thumbSize = getThumbSize();
if (slider.getOrientation() == JSlider.HORIZONTAL) {
int tickLength = getTickLength();
int contentHeight = height - insets.top - insets.bottom -
focusInsets.top - focusInsets.bottom;
int thumbHeight = thumbSize.height;
int centerSpacing = thumbHeight;
if (slider.getPaintTicks()) {
centerSpacing += tickLength;
}
// Assume uniform labels.
centerSpacing += getHeightOfTallestLabel();
int trackY = insets.top + focusInsets.top +
(contentHeight - centerSpacing - 1) / 2;
int trackHeight = thumbHeight;
int tickY = trackY + trackHeight;
int tickHeight = tickLength;
if (!slider.getPaintTicks()) {
tickHeight = 0;
}
int labelY = tickY + tickHeight;
return labelY + metrics.getAscent();
}
else { // vertical
boolean inverted = slider.getInverted();
Integer value = inverted ? getLowestValue() :
getHighestValue();
if (value != null) {
int thumbHeight = thumbSize.height;
int trackBuffer = Math.max(metrics.getHeight() / 2,
thumbHeight / 2);
int contentY = focusInsets.top + insets.top;
int trackY = contentY + trackBuffer;
int trackHeight = height - focusInsets.top -
focusInsets.bottom - insets.top - insets.bottom -
trackBuffer - trackBuffer;
int yPosition = yPositionForValue(value, trackY,
trackHeight);
return yPosition - metrics.getHeight() / 2 +
metrics.getAscent();
}
}
}
return 0;
}
/**
* Returns an enum indicating how the baseline of the component
* changes as the size changes.
*
* @throws NullPointerException {@inheritDoc}
* @see javax.swing.JComponent#getBaseline(int, int)
* @since 1.6
*/
public Component.BaselineResizeBehavior getBaselineResizeBehavior(
JComponent c) {
super.getBaselineResizeBehavior(c);
// NOTE: BasicSpinner really provides for CENTER_OFFSET, but
// the default min/pref size is smaller than it should be
// so that getBaseline() doesn't implement the contract
// for CENTER_OFFSET as defined in Component.
return Component.BaselineResizeBehavior.OTHER;
}
/**
* Returns true if all the labels from the label table have the same
* baseline.
*
* @return true if all the labels from the label table have the
* same baseline
* @since 1.6
*/
protected boolean labelsHaveSameBaselines() {
if (!checkedLabelBaselines) {
checkedLabelBaselines = true;
Dictionary dictionary = slider.getLabelTable();
if (dictionary != null) {
sameLabelBaselines = true;
Enumeration elements = dictionary.elements();
int baseline = -1;
while (elements.hasMoreElements()) {
JComponent label = (JComponent) elements.nextElement();
Dimension pref = label.getPreferredSize();
int labelBaseline = label.getBaseline(pref.width,
pref.height);
if (labelBaseline >= 0) {
if (baseline == -1) {
baseline = labelBaseline;
}
else if (baseline != labelBaseline) {
sameLabelBaselines = false;
break;
}
}
else {
sameLabelBaselines = false;
break;
}
}
}
else {
sameLabelBaselines = false;
}
}
return sameLabelBaselines;
}
public Dimension getPreferredHorizontalSize() {
Dimension horizDim = (Dimension)DefaultLookup.get(slider,
this, "Slider.horizontalSize");
if (horizDim == null) {
horizDim = new Dimension(200, 21);
}
return horizDim;
}
public Dimension getPreferredVerticalSize() {
Dimension vertDim = (Dimension)DefaultLookup.get(slider,
this, "Slider.verticalSize");
if (vertDim == null) {
vertDim = new Dimension(21, 200);
}
return vertDim;
}
public Dimension getMinimumHorizontalSize() {
Dimension minHorizDim = (Dimension)DefaultLookup.get(slider,
this, "Slider.minimumHorizontalSize");
if (minHorizDim == null) {
minHorizDim = new Dimension(36, 21);
}
return minHorizDim;
}
public Dimension getMinimumVerticalSize() {
Dimension minVertDim = (Dimension)DefaultLookup.get(slider,
this, "Slider.minimumVerticalSize");
if (minVertDim == null) {
minVertDim = new Dimension(21, 36);
}
return minVertDim;
}
public Dimension getPreferredSize(JComponent c) {
recalculateIfInsetsChanged();
Dimension d;
if ( slider.getOrientation() == JSlider.VERTICAL ) {
d = new Dimension(getPreferredVerticalSize());
d.width = insetCache.left + insetCache.right;
d.width += focusInsets.left + focusInsets.right;
d.width += trackRect.width + tickRect.width + labelRect.width;
}
else {
d = new Dimension(getPreferredHorizontalSize());
d.height = insetCache.top + insetCache.bottom;
d.height += focusInsets.top + focusInsets.bottom;
d.height += trackRect.height + tickRect.height + labelRect.height;
}
return d;
}
public Dimension getMinimumSize(JComponent c) {
recalculateIfInsetsChanged();
Dimension d;
if ( slider.getOrientation() == JSlider.VERTICAL ) {
d = new Dimension(getMinimumVerticalSize());
d.width = insetCache.left + insetCache.right;
d.width += focusInsets.left + focusInsets.right;
d.width += trackRect.width + tickRect.width + labelRect.width;
}
else {
d = new Dimension(getMinimumHorizontalSize());
d.height = insetCache.top + insetCache.bottom;
d.height += focusInsets.top + focusInsets.bottom;
d.height += trackRect.height + tickRect.height + labelRect.height;
}
return d;
}
public Dimension getMaximumSize(JComponent c) {
Dimension d = getPreferredSize(c);
if ( slider.getOrientation() == JSlider.VERTICAL ) {
d.height = Short.MAX_VALUE;
}
else {
d.width = Short.MAX_VALUE;
}
return d;
}
protected void calculateGeometry() {
calculateFocusRect();
calculateContentRect();
calculateThumbSize();
calculateTrackBuffer();
calculateTrackRect();
calculateTickRect();
calculateLabelRect();
calculateThumbLocation();
}
protected void calculateFocusRect() {
focusRect.x = insetCache.left;
focusRect.y = insetCache.top;
focusRect.width = slider.getWidth() - (insetCache.left + insetCache.right);
focusRect.height = slider.getHeight() - (insetCache.top + insetCache.bottom);
}
protected void calculateThumbSize() {
Dimension size = getThumbSize();
thumbRect.setSize( size.width, size.height );
}
protected void calculateContentRect() {
contentRect.x = focusRect.x + focusInsets.left;
contentRect.y = focusRect.y + focusInsets.top;
contentRect.width = focusRect.width - (focusInsets.left + focusInsets.right);
contentRect.height = focusRect.height - (focusInsets.top + focusInsets.bottom);
}
private int getTickSpacing() {
int majorTickSpacing = slider.getMajorTickSpacing();
int minorTickSpacing = slider.getMinorTickSpacing();
int result;
if (minorTickSpacing > 0) {
result = minorTickSpacing;
} else if (majorTickSpacing > 0) {
result = majorTickSpacing;
} else {
result = 0;
}
return result;
}
protected void calculateThumbLocation() {
if ( slider.getSnapToTicks() ) {
int sliderValue = slider.getValue();
int snappedValue = sliderValue;
int tickSpacing = getTickSpacing();
if ( tickSpacing != 0 ) {
// If it's not on a tick, change the value
if ( (sliderValue - slider.getMinimum()) % tickSpacing != 0 ) {
float temp = (float)(sliderValue - slider.getMinimum()) / (float)tickSpacing;
int whichTick = Math.round( temp );
// This is the fix for the bug #6401380
if (temp - (int)temp == .5 && sliderValue < lastValue) {
whichTick --;
}
snappedValue = slider.getMinimum() + (whichTick * tickSpacing);
}
if( snappedValue != sliderValue ) {
slider.setValue( snappedValue );
}
}
}
if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
int valuePosition = xPositionForValue(slider.getValue());
thumbRect.x = valuePosition - (thumbRect.width / 2);
thumbRect.y = trackRect.y;
}
else {
int valuePosition = yPositionForValue(slider.getValue());
thumbRect.x = trackRect.x;
thumbRect.y = valuePosition - (thumbRect.height / 2);
}
}
protected void calculateTrackBuffer() {
if ( slider.getPaintLabels() && slider.getLabelTable() != null ) {
Component highLabel = getHighestValueLabel();
Component lowLabel = getLowestValueLabel();
if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
trackBuffer = Math.max( highLabel.getBounds().width, lowLabel.getBounds().width ) / 2;
trackBuffer = Math.max( trackBuffer, thumbRect.width / 2 );
}
else {
trackBuffer = Math.max( highLabel.getBounds().height, lowLabel.getBounds().height ) / 2;
trackBuffer = Math.max( trackBuffer, thumbRect.height / 2 );
}
}
else {
if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
trackBuffer = thumbRect.width / 2;
}
else {
trackBuffer = thumbRect.height / 2;
}
}
}
protected void calculateTrackRect() {
int centerSpacing; // used to center sliders added using BorderLayout.CENTER (bug 4275631)
if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
centerSpacing = thumbRect.height;
if ( slider.getPaintTicks() ) centerSpacing += getTickLength();
if ( slider.getPaintLabels() ) centerSpacing += getHeightOfTallestLabel();
trackRect.x = contentRect.x + trackBuffer;
trackRect.y = contentRect.y + (contentRect.height - centerSpacing - 1)/2;
trackRect.width = contentRect.width - (trackBuffer * 2);
trackRect.height = thumbRect.height;
}
else {
centerSpacing = thumbRect.width;
if (BasicGraphicsUtils.isLeftToRight(slider)) {
if ( slider.getPaintTicks() ) centerSpacing += getTickLength();
if ( slider.getPaintLabels() ) centerSpacing += getWidthOfWidestLabel();
} else {
if ( slider.getPaintTicks() ) centerSpacing -= getTickLength();
if ( slider.getPaintLabels() ) centerSpacing -= getWidthOfWidestLabel();
}
trackRect.x = contentRect.x + (contentRect.width - centerSpacing - 1)/2;
trackRect.y = contentRect.y + trackBuffer;
trackRect.width = thumbRect.width;
trackRect.height = contentRect.height - (trackBuffer * 2);
}
}
/**
* Gets the height of the tick area for horizontal sliders and the width of the
* tick area for vertical sliders. BasicSliderUI uses the returned value to
* determine the tick area rectangle. If you want to give your ticks some room,
* make this larger than you need and paint your ticks away from the sides in paintTicks().
*/
protected int getTickLength() {
return 8;
}
protected void calculateTickRect() {
if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
tickRect.x = trackRect.x;
tickRect.y = trackRect.y + trackRect.height;
tickRect.width = trackRect.width;
tickRect.height = (slider.getPaintTicks()) ? getTickLength() : 0;
}
else {
tickRect.width = (slider.getPaintTicks()) ? getTickLength() : 0;
if(BasicGraphicsUtils.isLeftToRight(slider)) {
tickRect.x = trackRect.x + trackRect.width;
}
else {
tickRect.x = trackRect.x - tickRect.width;
}
tickRect.y = trackRect.y;
tickRect.height = trackRect.height;
}
}
protected void calculateLabelRect() {
if ( slider.getPaintLabels() ) {
if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
labelRect.x = tickRect.x - trackBuffer;
labelRect.y = tickRect.y + tickRect.height;
labelRect.width = tickRect.width + (trackBuffer * 2);
labelRect.height = getHeightOfTallestLabel();
}
else {
if(BasicGraphicsUtils.isLeftToRight(slider)) {
labelRect.x = tickRect.x + tickRect.width;
labelRect.width = getWidthOfWidestLabel();
}
else {
labelRect.width = getWidthOfWidestLabel();
labelRect.x = tickRect.x - labelRect.width;
}
labelRect.y = tickRect.y - trackBuffer;
labelRect.height = tickRect.height + (trackBuffer * 2);
}
}
else {
if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
labelRect.x = tickRect.x;
labelRect.y = tickRect.y + tickRect.height;
labelRect.width = tickRect.width;
labelRect.height = 0;
}
else {
if(BasicGraphicsUtils.isLeftToRight(slider)) {
labelRect.x = tickRect.x + tickRect.width;
}
else {
labelRect.x = tickRect.x;
}
labelRect.y = tickRect.y;
labelRect.width = 0;
labelRect.height = tickRect.height;
}
}
}
protected Dimension getThumbSize() {
Dimension size = new Dimension();
if ( slider.getOrientation() == JSlider.VERTICAL ) {
size.width = 20;
size.height = 11;
}
else {
size.width = 11;
size.height = 20;
}
return size;
}
public class PropertyChangeHandler implements PropertyChangeListener {
// NOTE: This class exists only for backward compatibility. All
// its functionality has been moved into Handler. If you need to add
// new functionality add it to the Handler, but make sure this
// class calls into the Handler.
public void propertyChange( PropertyChangeEvent e ) {
getHandler().propertyChange(e);
}
}
protected int getWidthOfWidestLabel() {
Dictionary dictionary = slider.getLabelTable();
int widest = 0;
if ( dictionary != null ) {
Enumeration keys = dictionary.keys();
while ( keys.hasMoreElements() ) {
JComponent label = (JComponent) dictionary.get(keys.nextElement());
widest = Math.max( label.getPreferredSize().width, widest );
}
}
return widest;
}
protected int getHeightOfTallestLabel() {
Dictionary dictionary = slider.getLabelTable();
int tallest = 0;
if ( dictionary != null ) {
Enumeration keys = dictionary.keys();
while ( keys.hasMoreElements() ) {
JComponent label = (JComponent) dictionary.get(keys.nextElement());
tallest = Math.max( label.getPreferredSize().height, tallest );
}
}
return tallest;
}
protected int getWidthOfHighValueLabel() {
Component label = getHighestValueLabel();
int width = 0;
if ( label != null ) {
width = label.getPreferredSize().width;
}
return width;
}
protected int getWidthOfLowValueLabel() {
Component label = getLowestValueLabel();
int width = 0;
if ( label != null ) {
width = label.getPreferredSize().width;
}
return width;
}
protected int getHeightOfHighValueLabel() {
Component label = getHighestValueLabel();
int height = 0;
if ( label != null ) {
height = label.getPreferredSize().height;
}
return height;
}
protected int getHeightOfLowValueLabel() {
Component label = getLowestValueLabel();
int height = 0;
if ( label != null ) {
height = label.getPreferredSize().height;
}
return height;
}
protected boolean drawInverted() {
if (slider.getOrientation()==JSlider.HORIZONTAL) {
if(BasicGraphicsUtils.isLeftToRight(slider)) {
return slider.getInverted();
} else {
return !slider.getInverted();
}
} else {
return slider.getInverted();
}
}
/**
* Returns the biggest value that has an entry in the label table.
*
* @return biggest value that has an entry in the label table, or
* null.
* @since 1.6
*/
protected Integer getHighestValue() {
Dictionary dictionary = slider.getLabelTable();
if (dictionary == null) {
return null;
}
Enumeration keys = dictionary.keys();
Integer max = null;
while (keys.hasMoreElements()) {
Integer i = (Integer) keys.nextElement();
if (max == null || i > max) {
max = i;
}
}
return max;
}
/**
* Returns the smallest value that has an entry in the label table.
*
* @return smallest value that has an entry in the label table, or
* null.
* @since 1.6
*/
protected Integer getLowestValue() {
Dictionary dictionary = slider.getLabelTable();
if (dictionary == null) {
return null;
}
Enumeration keys = dictionary.keys();
Integer min = null;
while (keys.hasMoreElements()) {
Integer i = (Integer) keys.nextElement();
if (min == null || i < min) {
min = i;
}
}
return min;
}
/**
* Returns the label that corresponds to the highest slider value in the label table.
* @see JSlider#setLabelTable
*/
protected Component getLowestValueLabel() {
Integer min = getLowestValue();
if (min != null) {
return (Component)slider.getLabelTable().get(min);
}
return null;
}
/**
* Returns the label that corresponds to the lowest slider value in the label table.
* @see JSlider#setLabelTable
*/
protected Component getHighestValueLabel() {
Integer max = getHighestValue();
if (max != null) {
return (Component)slider.getLabelTable().get(max);
}
return null;
}
public void paint( Graphics g, JComponent c ) {
recalculateIfInsetsChanged();
recalculateIfOrientationChanged();
Rectangle clip = g.getClipBounds();
if ( !clip.intersects(trackRect) && slider.getPaintTrack())
calculateGeometry();
if ( slider.getPaintTrack() && clip.intersects( trackRect ) ) {
paintTrack( g );
}
if ( slider.getPaintTicks() && clip.intersects( tickRect ) ) {
paintTicks( g );
}
if ( slider.getPaintLabels() && clip.intersects( labelRect ) ) {
paintLabels( g );
}
if ( slider.hasFocus() && clip.intersects( focusRect ) ) {
paintFocus( g );
}
if ( clip.intersects( thumbRect ) ) {
paintThumb( g );
}
}
protected void recalculateIfInsetsChanged() {
Insets newInsets = slider.getInsets();
if ( !newInsets.equals( insetCache ) ) {
insetCache = newInsets;
calculateGeometry();
}
}
protected void recalculateIfOrientationChanged() {
boolean ltr = BasicGraphicsUtils.isLeftToRight(slider);
if ( ltr!=leftToRightCache ) {
leftToRightCache = ltr;
calculateGeometry();
}
}
public void paintFocus(Graphics g) {
g.setColor( getFocusColor() );
BasicGraphicsUtils.drawDashedRect( g, focusRect.x, focusRect.y,
focusRect.width, focusRect.height );
}
public void paintTrack(Graphics g) {
Rectangle trackBounds = trackRect;
if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
int cy = (trackBounds.height / 2) - 2;
int cw = trackBounds.width;
g.translate(trackBounds.x, trackBounds.y + cy);
g.setColor(getShadowColor());
g.drawLine(0, 0, cw - 1, 0);
g.drawLine(0, 1, 0, 2);
g.setColor(getHighlightColor());
g.drawLine(0, 3, cw, 3);
g.drawLine(cw, 0, cw, 3);
g.setColor(Color.black);
g.drawLine(1, 1, cw-2, 1);
g.translate(-trackBounds.x, -(trackBounds.y + cy));
}
else {
int cx = (trackBounds.width / 2) - 2;
int ch = trackBounds.height;
g.translate(trackBounds.x + cx, trackBounds.y);
g.setColor(getShadowColor());
g.drawLine(0, 0, 0, ch - 1);
g.drawLine(1, 0, 2, 0);
g.setColor(getHighlightColor());
g.drawLine(3, 0, 3, ch);
g.drawLine(0, ch, 3, ch);
g.setColor(Color.black);
g.drawLine(1, 1, 1, ch-2);
g.translate(-(trackBounds.x + cx), -trackBounds.y);
}
}
public void paintTicks(Graphics g) {
Rectangle tickBounds = tickRect;
g.setColor(DefaultLookup.getColor(slider, this, "Slider.tickColor", Color.black));
if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
g.translate(0, tickBounds.y);
if (slider.getMinorTickSpacing() > 0) {
int value = slider.getMinimum();
while ( value <= slider.getMaximum() ) {
int xPos = xPositionForValue(value);
paintMinorTickForHorizSlider( g, tickBounds, xPos );
// Overflow checking
if (Integer.MAX_VALUE - slider.getMinorTickSpacing() < value) {
break;
}
value += slider.getMinorTickSpacing();
}
}
if (slider.getMajorTickSpacing() > 0) {
int value = slider.getMinimum();
while ( value <= slider.getMaximum() ) {
int xPos = xPositionForValue(value);
paintMajorTickForHorizSlider( g, tickBounds, xPos );
// Overflow checking
if (Integer.MAX_VALUE - slider.getMajorTickSpacing() < value) {
break;
}
value += slider.getMajorTickSpacing();
}
}
g.translate( 0, -tickBounds.y);
} else {
g.translate(tickBounds.x, 0);
if (slider.getMinorTickSpacing() > 0) {
int offset = 0;
if(!BasicGraphicsUtils.isLeftToRight(slider)) {
offset = tickBounds.width - tickBounds.width / 2;
g.translate(offset, 0);
}
int value = slider.getMinimum();
while (value <= slider.getMaximum()) {
int yPos = yPositionForValue(value);
paintMinorTickForVertSlider( g, tickBounds, yPos );
// Overflow checking
if (Integer.MAX_VALUE - slider.getMinorTickSpacing() < value) {
break;
}
value += slider.getMinorTickSpacing();
}
if(!BasicGraphicsUtils.isLeftToRight(slider)) {
g.translate(-offset, 0);
}
}
if (slider.getMajorTickSpacing() > 0) {
if(!BasicGraphicsUtils.isLeftToRight(slider)) {
g.translate(2, 0);
}
int value = slider.getMinimum();
while (value <= slider.getMaximum()) {
int yPos = yPositionForValue(value);
paintMajorTickForVertSlider( g, tickBounds, yPos );
// Overflow checking
if (Integer.MAX_VALUE - slider.getMajorTickSpacing() < value) {
break;
}
value += slider.getMajorTickSpacing();
}
if(!BasicGraphicsUtils.isLeftToRight(slider)) {
g.translate(-2, 0);
}
}
g.translate(-tickBounds.x, 0);
}
}
protected void paintMinorTickForHorizSlider( Graphics g, Rectangle tickBounds, int x ) {
g.drawLine( x, 0, x, tickBounds.height / 2 - 1 );
}
protected void paintMajorTickForHorizSlider( Graphics g, Rectangle tickBounds, int x ) {
g.drawLine( x, 0, x, tickBounds.height - 2 );
}
protected void paintMinorTickForVertSlider( Graphics g, Rectangle tickBounds, int y ) {
g.drawLine( 0, y, tickBounds.width / 2 - 1, y );
}
protected void paintMajorTickForVertSlider( Graphics g, Rectangle tickBounds, int y ) {
g.drawLine( 0, y, tickBounds.width - 2, y );
}
public void paintLabels( Graphics g ) {
Rectangle labelBounds = labelRect;
Dictionary dictionary = slider.getLabelTable();
if ( dictionary != null ) {
Enumeration keys = dictionary.keys();
int minValue = slider.getMinimum();
int maxValue = slider.getMaximum();
boolean enabled = slider.isEnabled();
while ( keys.hasMoreElements() ) {
Integer key = (Integer)keys.nextElement();
int value = key.intValue();
if (value >= minValue && value <= maxValue) {
JComponent label = (JComponent) dictionary.get(key);
label.setEnabled(enabled);
if (label instanceof JLabel) {
Icon icon = label.isEnabled() ? ((JLabel) label).getIcon() : ((JLabel) label).getDisabledIcon();
if (icon instanceof ImageIcon) {
// Register Slider as an image observer. It allows to catch notifications about
// image changes (e.g. gif animation)
Toolkit.getDefaultToolkit().checkImage(((ImageIcon) icon).getImage(), -1, -1, slider);
}
}
if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
g.translate( 0, labelBounds.y );
paintHorizontalLabel( g, value, label );
g.translate( 0, -labelBounds.y );
}
else {
int offset = 0;
if (!BasicGraphicsUtils.isLeftToRight(slider)) {
offset = labelBounds.width -
label.getPreferredSize().width;
}
g.translate( labelBounds.x + offset, 0 );
paintVerticalLabel( g, value, label );
g.translate( -labelBounds.x - offset, 0 );
}
}
}
}
}
/**
* Called for every label in the label table. Used to draw the labels for horizontal sliders.
* The graphics have been translated to labelRect.y already.
* @see JSlider#setLabelTable
*/
protected void paintHorizontalLabel( Graphics g, int value, Component label ) {
int labelCenter = xPositionForValue( value );
int labelLeft = labelCenter - (label.getPreferredSize().width / 2);
g.translate( labelLeft, 0 );
label.paint( g );
g.translate( -labelLeft, 0 );
}
/**
* Called for every label in the label table. Used to draw the labels for vertical sliders.
* The graphics have been translated to labelRect.x already.
* @see JSlider#setLabelTable
*/
protected void paintVerticalLabel( Graphics g, int value, Component label ) {
int labelCenter = yPositionForValue( value );
int labelTop = labelCenter - (label.getPreferredSize().height / 2);
g.translate( 0, labelTop );
label.paint( g );
g.translate( 0, -labelTop );
}
public void paintThumb(Graphics g) {
Rectangle knobBounds = thumbRect;
int w = knobBounds.width;
int h = knobBounds.height;
g.translate(knobBounds.x, knobBounds.y);
if ( slider.isEnabled() ) {
g.setColor(slider.getBackground());
}
else {
g.setColor(slider.getBackground().darker());
}
Boolean paintThumbArrowShape =
(Boolean)slider.getClientProperty("Slider.paintThumbArrowShape");
if ((!slider.getPaintTicks() && paintThumbArrowShape == null) ||
paintThumbArrowShape == Boolean.FALSE) {
// "plain" version
g.fillRect(0, 0, w, h);
g.setColor(Color.black);
g.drawLine(0, h-1, w-1, h-1);
g.drawLine(w-1, 0, w-1, h-1);
g.setColor(highlightColor);
g.drawLine(0, 0, 0, h-2);
g.drawLine(1, 0, w-2, 0);
g.setColor(shadowColor);
g.drawLine(1, h-2, w-2, h-2);
g.drawLine(w-2, 1, w-2, h-3);
}
else if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
int cw = w / 2;
g.fillRect(1, 1, w-3, h-1-cw);
Polygon p = new Polygon();
p.addPoint(1, h-cw);
p.addPoint(cw-1, h-1);
p.addPoint(w-2, h-1-cw);
g.fillPolygon(p);
g.setColor(highlightColor);
g.drawLine(0, 0, w-2, 0);
g.drawLine(0, 1, 0, h-1-cw);
g.drawLine(0, h-cw, cw-1, h-1);
g.setColor(Color.black);
g.drawLine(w-1, 0, w-1, h-2-cw);
g.drawLine(w-1, h-1-cw, w-1-cw, h-1);
g.setColor(shadowColor);
g.drawLine(w-2, 1, w-2, h-2-cw);
g.drawLine(w-2, h-1-cw, w-1-cw, h-2);
}
else { // vertical
int cw = h / 2;
if(BasicGraphicsUtils.isLeftToRight(slider)) {
g.fillRect(1, 1, w-1-cw, h-3);
Polygon p = new Polygon();
p.addPoint(w-cw-1, 0);
p.addPoint(w-1, cw);
p.addPoint(w-1-cw, h-2);
g.fillPolygon(p);
g.setColor(highlightColor);
g.drawLine(0, 0, 0, h - 2); // left
g.drawLine(1, 0, w-1-cw, 0); // top
g.drawLine(w-cw-1, 0, w-1, cw); // top slant
g.setColor(Color.black);
g.drawLine(0, h-1, w-2-cw, h-1); // bottom
g.drawLine(w-1-cw, h-1, w-1, h-1-cw); // bottom slant
g.setColor(shadowColor);
g.drawLine(1, h-2, w-2-cw, h-2 ); // bottom
g.drawLine(w-1-cw, h-2, w-2, h-cw-1 ); // bottom slant
}
else {
g.fillRect(5, 1, w-1-cw, h-3);
Polygon p = new Polygon();
p.addPoint(cw, 0);
p.addPoint(0, cw);
p.addPoint(cw, h-2);
g.fillPolygon(p);
g.setColor(highlightColor);
g.drawLine(cw-1, 0, w-2, 0); // top
g.drawLine(0, cw, cw, 0); // top slant
g.setColor(Color.black);
g.drawLine(0, h-1-cw, cw, h-1 ); // bottom slant
g.drawLine(cw, h-1, w-1, h-1); // bottom
g.setColor(shadowColor);
g.drawLine(cw, h-2, w-2, h-2 ); // bottom
g.drawLine(w-1, 1, w-1, h-2 ); // right
}
}
g.translate(-knobBounds.x, -knobBounds.y);
}
// Used exclusively by setThumbLocation()
private static Rectangle unionRect = new Rectangle();
public void setThumbLocation(int x, int y) {
unionRect.setBounds( thumbRect );
thumbRect.setLocation( x, y );
SwingUtilities.computeUnion( thumbRect.x, thumbRect.y, thumbRect.width, thumbRect.height, unionRect );
slider.repaint( unionRect.x, unionRect.y, unionRect.width, unionRect.height );
}
public void scrollByBlock(int direction) {
synchronized(slider) {
int blockIncrement =
(slider.getMaximum() - slider.getMinimum()) / 10;
if (blockIncrement == 0) {
blockIncrement = 1;
}
if (slider.getSnapToTicks()) {
int tickSpacing = getTickSpacing();
if (blockIncrement < tickSpacing) {
blockIncrement = tickSpacing;
}
}
int delta = blockIncrement * ((direction > 0) ? POSITIVE_SCROLL : NEGATIVE_SCROLL);
slider.setValue(slider.getValue() + delta);
}
}
public void scrollByUnit(int direction) {
synchronized(slider) {
int delta = ((direction > 0) ? POSITIVE_SCROLL : NEGATIVE_SCROLL);
if (slider.getSnapToTicks()) {
delta *= getTickSpacing();
}
slider.setValue(slider.getValue() + delta);
}
}
/**
* This function is called when a mousePressed was detected in the track, not
* in the thumb. The default behavior is to scroll by block. You can
* override this method to stop it from scrolling or to add additional behavior.
*/
protected void scrollDueToClickInTrack( int dir ) {
scrollByBlock( dir );
}
protected int xPositionForValue( int value ) {
int min = slider.getMinimum();
int max = slider.getMaximum();
int trackLength = trackRect.width;
double valueRange = (double)max - (double)min;
double pixelsPerValue = (double)trackLength / valueRange;
int trackLeft = trackRect.x;
int trackRight = trackRect.x + (trackRect.width - 1);
int xPosition;
if ( !drawInverted() ) {
xPosition = trackLeft;
xPosition += Math.round( pixelsPerValue * ((double)value - min) );
}
else {
xPosition = trackRight;
xPosition -= Math.round( pixelsPerValue * ((double)value - min) );
}
xPosition = Math.max( trackLeft, xPosition );
xPosition = Math.min( trackRight, xPosition );
return xPosition;
}
protected int yPositionForValue( int value ) {
return yPositionForValue(value, trackRect.y, trackRect.height);
}
/**
* Returns the y location for the specified value. No checking is
* done on the arguments. In particular if <code>trackHeight</code> is
* negative undefined results may occur.
*
* @param value the slider value to get the location for
* @param trackY y-origin of the track
* @param trackHeight the height of the track
* @since 1.6
*/
protected int yPositionForValue(int value, int trackY, int trackHeight) {
int min = slider.getMinimum();
int max = slider.getMaximum();
double valueRange = (double)max - (double)min;
double pixelsPerValue = (double)trackHeight / valueRange;
int trackBottom = trackY + (trackHeight - 1);
int yPosition;
if ( !drawInverted() ) {
yPosition = trackY;
yPosition += Math.round( pixelsPerValue * ((double)max - value ) );
}
else {
yPosition = trackY;
yPosition += Math.round( pixelsPerValue * ((double)value - min) );
}
yPosition = Math.max( trackY, yPosition );
yPosition = Math.min( trackBottom, yPosition );
return yPosition;
}
/**
* Returns the value at the y position. If {@code yPos} is beyond the
* track at the the bottom or the top, this method sets the value to either
* the minimum or maximum value of the slider, depending on if the slider
* is inverted or not.
*/
public int valueForYPosition( int yPos ) {
int value;
final int minValue = slider.getMinimum();
final int maxValue = slider.getMaximum();
final int trackLength = trackRect.height;
final int trackTop = trackRect.y;
final int trackBottom = trackRect.y + (trackRect.height - 1);
if ( yPos <= trackTop ) {
value = drawInverted() ? minValue : maxValue;
}
else if ( yPos >= trackBottom ) {
value = drawInverted() ? maxValue : minValue;
}
else {
int distanceFromTrackTop = yPos - trackTop;
double valueRange = (double)maxValue - (double)minValue;
double valuePerPixel = valueRange / (double)trackLength;
int valueFromTrackTop = (int)Math.round( distanceFromTrackTop * valuePerPixel );
value = drawInverted() ? minValue + valueFromTrackTop : maxValue - valueFromTrackTop;
}
return value;
}
/**
* Returns the value at the x position. If {@code xPos} is beyond the
* track at the left or the right, this method sets the value to either the
* minimum or maximum value of the slider, depending on if the slider is
* inverted or not.
*/
public int valueForXPosition( int xPos ) {
int value;
final int minValue = slider.getMinimum();
final int maxValue = slider.getMaximum();
final int trackLength = trackRect.width;
final int trackLeft = trackRect.x;
final int trackRight = trackRect.x + (trackRect.width - 1);
if ( xPos <= trackLeft ) {
value = drawInverted() ? maxValue : minValue;
}
else if ( xPos >= trackRight ) {
value = drawInverted() ? minValue : maxValue;
}
else {
int distanceFromTrackLeft = xPos - trackLeft;
double valueRange = (double)maxValue - (double)minValue;
double valuePerPixel = valueRange / (double)trackLength;
int valueFromTrackLeft = (int)Math.round( distanceFromTrackLeft * valuePerPixel );
value = drawInverted() ? maxValue - valueFromTrackLeft :
minValue + valueFromTrackLeft;
}
return value;
}
private class Handler implements ChangeListener,
ComponentListener, FocusListener, PropertyChangeListener {
// Change Handler
public void stateChanged(ChangeEvent e) {
if (!isDragging) {
calculateThumbLocation();
slider.repaint();
}
lastValue = slider.getValue();
}
// Component Handler
public void componentHidden(ComponentEvent e) { }
public void componentMoved(ComponentEvent e) { }
public void componentResized(ComponentEvent e) {
calculateGeometry();
slider.repaint();
}
public void componentShown(ComponentEvent e) { }
// Focus Handler
public void focusGained(FocusEvent e) { slider.repaint(); }
public void focusLost(FocusEvent e) { slider.repaint(); }
// Property Change Handler
public void propertyChange(PropertyChangeEvent e) {
String propertyName = e.getPropertyName();
if (propertyName == "orientation" ||
propertyName == "inverted" ||
propertyName == "labelTable" ||
propertyName == "majorTickSpacing" ||
propertyName == "minorTickSpacing" ||
propertyName == "paintTicks" ||
propertyName == "paintTrack" ||
propertyName == "font" ||
propertyName == "paintLabels" ||
propertyName == "Slider.paintThumbArrowShape") {
checkedLabelBaselines = false;
calculateGeometry();
slider.repaint();
} else if (propertyName == "componentOrientation") {
calculateGeometry();
slider.repaint();
InputMap km = getInputMap(JComponent.WHEN_FOCUSED, slider);
SwingUtilities.replaceUIInputMap(slider,
JComponent.WHEN_FOCUSED, km);
} else if (propertyName == "model") {
((BoundedRangeModel)e.getOldValue()).removeChangeListener(
changeListener);
((BoundedRangeModel)e.getNewValue()).addChangeListener(
changeListener);
calculateThumbLocation();
slider.repaint();
}
}
}
/////////////////////////////////////////////////////////////////////////
/// Model Listener Class
/////////////////////////////////////////////////////////////////////////
/**
* Data model listener.
*
* This class should be treated as a "protected" inner class.
* Instantiate it only within subclasses of <code>Foo</code>.
*/
public class ChangeHandler implements ChangeListener {
// NOTE: This class exists only for backward compatibility. All
// its functionality has been moved into Handler. If you need to add
// new functionality add it to the Handler, but make sure this
// class calls into the Handler.
public void stateChanged(ChangeEvent e) {
getHandler().stateChanged(e);
}
}
/////////////////////////////////////////////////////////////////////////
/// Track Listener Class
/////////////////////////////////////////////////////////////////////////
/**
* Track mouse movements.
*
* This class should be treated as a "protected" inner class.
* Instantiate it only within subclasses of <code>Foo</code>.
*/
public class TrackListener extends MouseInputAdapter {
protected transient int offset;
protected transient int currentMouseX, currentMouseY;
public void mouseReleased(MouseEvent e) {
if (!slider.isEnabled()) {
return;
}
offset = 0;
scrollTimer.stop();
isDragging = false;
slider.setValueIsAdjusting(false);
slider.repaint();
}
/**
* If the mouse is pressed above the "thumb" component
* then reduce the scrollbars value by one page ("page up"),
* otherwise increase it by one page. If there is no
* thumb then page up if the mouse is in the upper half
* of the track.
*/
public void mousePressed(MouseEvent e) {
if (!slider.isEnabled()) {
return;
}
// We should recalculate geometry just before
// calculation of the thumb movement direction.
// It is important for the case, when JSlider
// is a cell editor in JTable. See 6348946.
calculateGeometry();
currentMouseX = e.getX();
currentMouseY = e.getY();
if (slider.isRequestFocusEnabled()) {
slider.requestFocus();
}
// Clicked in the Thumb area?
if (thumbRect.contains(currentMouseX, currentMouseY)) {
if (UIManager.getBoolean("Slider.onlyLeftMouseButtonDrag")
&& !SwingUtilities.isLeftMouseButton(e)) {
return;
}
switch (slider.getOrientation()) {
case JSlider.VERTICAL:
offset = currentMouseY - thumbRect.y;
break;
case JSlider.HORIZONTAL:
offset = currentMouseX - thumbRect.x;
break;
}
isDragging = true;
return;
}
if (!SwingUtilities.isLeftMouseButton(e)) {
return;
}
isDragging = false;
slider.setValueIsAdjusting(true);
Dimension sbSize = slider.getSize();
int direction = POSITIVE_SCROLL;
switch (slider.getOrientation()) {
case JSlider.VERTICAL:
if ( thumbRect.isEmpty() ) {
int scrollbarCenter = sbSize.height / 2;
if ( !drawInverted() ) {
direction = (currentMouseY < scrollbarCenter) ?
POSITIVE_SCROLL : NEGATIVE_SCROLL;
}
else {
direction = (currentMouseY < scrollbarCenter) ?
NEGATIVE_SCROLL : POSITIVE_SCROLL;
}
}
else {
int thumbY = thumbRect.y;
if ( !drawInverted() ) {
direction = (currentMouseY < thumbY) ?
POSITIVE_SCROLL : NEGATIVE_SCROLL;
}
else {
direction = (currentMouseY < thumbY) ?
NEGATIVE_SCROLL : POSITIVE_SCROLL;
}
}
break;
case JSlider.HORIZONTAL:
if ( thumbRect.isEmpty() ) {
int scrollbarCenter = sbSize.width / 2;
if ( !drawInverted() ) {
direction = (currentMouseX < scrollbarCenter) ?
NEGATIVE_SCROLL : POSITIVE_SCROLL;
}
else {
direction = (currentMouseX < scrollbarCenter) ?
POSITIVE_SCROLL : NEGATIVE_SCROLL;
}
}
else {
int thumbX = thumbRect.x;
if ( !drawInverted() ) {
direction = (currentMouseX < thumbX) ?
NEGATIVE_SCROLL : POSITIVE_SCROLL;
}
else {
direction = (currentMouseX < thumbX) ?
POSITIVE_SCROLL : NEGATIVE_SCROLL;
}
}
break;
}
if (shouldScroll(direction)) {
scrollDueToClickInTrack(direction);
}
if (shouldScroll(direction)) {
scrollTimer.stop();
scrollListener.setDirection(direction);
scrollTimer.start();
}
}
public boolean shouldScroll(int direction) {
Rectangle r = thumbRect;
if (slider.getOrientation() == JSlider.VERTICAL) {
if (drawInverted() ? direction < 0 : direction > 0) {
if (r.y <= currentMouseY) {
return false;
}
}
else if (r.y + r.height >= currentMouseY) {
return false;
}
}
else {
if (drawInverted() ? direction < 0 : direction > 0) {
if (r.x + r.width >= currentMouseX) {
return false;
}
}
else if (r.x <= currentMouseX) {
return false;
}
}
if (direction > 0 && slider.getValue() + slider.getExtent() >=
slider.getMaximum()) {
return false;
}
else if (direction < 0 && slider.getValue() <=
slider.getMinimum()) {
return false;
}
return true;
}
/**
* Set the models value to the position of the top/left
* of the thumb relative to the origin of the track.
*/
public void mouseDragged(MouseEvent e) {
int thumbMiddle;
if (!slider.isEnabled()) {
return;
}
currentMouseX = e.getX();
currentMouseY = e.getY();
if (!isDragging) {
return;
}
slider.setValueIsAdjusting(true);
switch (slider.getOrientation()) {
case JSlider.VERTICAL:
int halfThumbHeight = thumbRect.height / 2;
int thumbTop = e.getY() - offset;
int trackTop = trackRect.y;
int trackBottom = trackRect.y + (trackRect.height - 1);
int vMax = yPositionForValue(slider.getMaximum() -
slider.getExtent());
if (drawInverted()) {
trackBottom = vMax;
}
else {
trackTop = vMax;
}
thumbTop = Math.max(thumbTop, trackTop - halfThumbHeight);
thumbTop = Math.min(thumbTop, trackBottom - halfThumbHeight);
setThumbLocation(thumbRect.x, thumbTop);
thumbMiddle = thumbTop + halfThumbHeight;
slider.setValue( valueForYPosition( thumbMiddle ) );
break;
case JSlider.HORIZONTAL:
int halfThumbWidth = thumbRect.width / 2;
int thumbLeft = e.getX() - offset;
int trackLeft = trackRect.x;
int trackRight = trackRect.x + (trackRect.width - 1);
int hMax = xPositionForValue(slider.getMaximum() -
slider.getExtent());
if (drawInverted()) {
trackLeft = hMax;
}
else {
trackRight = hMax;
}
thumbLeft = Math.max(thumbLeft, trackLeft - halfThumbWidth);
thumbLeft = Math.min(thumbLeft, trackRight - halfThumbWidth);
setThumbLocation(thumbLeft, thumbRect.y);
thumbMiddle = thumbLeft + halfThumbWidth;
slider.setValue(valueForXPosition(thumbMiddle));
break;
}
}
public void mouseMoved(MouseEvent e) { }
}
/**
* Scroll-event listener.
*
* This class should be treated as a "protected" inner class.
* Instantiate it only within subclasses of <code>Foo</code>.
*/
public class ScrollListener implements ActionListener {
// changed this class to public to avoid bogus IllegalAccessException
// bug in InternetExplorer browser. It was protected. Work around
// for 4109432
int direction = POSITIVE_SCROLL;
boolean useBlockIncrement;
public ScrollListener() {
direction = POSITIVE_SCROLL;
useBlockIncrement = true;
}
public ScrollListener(int dir, boolean block) {
direction = dir;
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