Java example source code file (XScrollbar.java)
The XScrollbar.java Java example source code
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* particular file as subject to the "Classpath" exception as provided
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*
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* 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).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
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package sun.awt.X11;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import sun.awt.SunToolkit;
import sun.awt.X11GraphicsConfig;
import sun.util.logging.PlatformLogger;
/**
* A simple vertical scroll bar.
*/
abstract class XScrollbar {
private static PlatformLogger log = PlatformLogger.getLogger("sun.awt.X11.XScrollbar");
/**
* The thread that asynchronously tells the scrollbar to scroll.
* @see #startScrolling
*/
private static XScrollRepeater scroller = new XScrollRepeater(null);
/*
* The repeater that used for concurrent scrolling of the vertical and horizontal scrollbar
* And so there is not static keyword
* See 6243382 for more information
*/
private XScrollRepeater i_scroller = new XScrollRepeater(null);
// Thumb length is always >= MIN_THUMB_H
private final static int MIN_THUMB_H = 5;
private static final int ARROW_IND = 1;
XScrollbarClient sb;
//Use set methods to set scrollbar parameters
private int val;
private int min;
private int max;
private int vis;
private int line;
private int page;
private boolean needsRepaint = true;
private boolean pressed = false;
private boolean dragging = false;
Polygon firstArrow, secondArrow;
int width, height; // Dimensions of the visible part of the parent window
int barWidth, barLength; // Rotation-independent values,
// equal to (width, height) for vertical,
// rotated by 90 for horizontal.
// That is, barLength is always the length between
// the tips of the arrows.
int arrowArea; // The area reserved for the scroll arrows
int alignment;
public static final int ALIGNMENT_VERTICAL = 1, ALIGNMENT_HORIZONTAL = 2;
int mode;
Point thumbOffset;
private Rectangle prevThumb;
public XScrollbar(int alignment, XScrollbarClient sb) {
this.sb = sb;
this.alignment = alignment;
}
public boolean needsRepaint() {
return needsRepaint;
}
void notifyValue(int v) {
notifyValue(v, false);
}
void notifyValue(int v, final boolean isAdjusting) {
if (v < min) {
v = min;
} else if (v > max - vis) {
v = max - vis;
}
final int value = v;
final int mode = this.mode;
if ((sb != null) && ((value != val)||(!pressed))) {
SunToolkit.executeOnEventHandlerThread(sb.getEventSource(), new Runnable() {
public void run() {
sb.notifyValue(XScrollbar.this, mode, value, isAdjusting);
}
});
}
}
abstract protected void rebuildArrows();
public void setSize(int width, int height) {
if (log.isLoggable(PlatformLogger.Level.FINER)) {
log.finer("Setting scroll bar " + this + " size to " + width + "x" + height);
}
this.width = width;
this.height = height;
}
/**
* Creates oriented directed arrow
*/
protected Polygon createArrowShape(boolean vertical, boolean up) {
Polygon arrow = new Polygon();
// TODO: this should be done polymorphically in subclasses
// FIXME: arrows overlap the thumb for very wide scrollbars
if (vertical) {
int x = width / 2 - getArrowWidth()/2;
int y1 = (up ? ARROW_IND : barLength - ARROW_IND);
int y2 = (up ? getArrowWidth() : barLength - getArrowWidth() - ARROW_IND);
arrow.addPoint(x + getArrowWidth()/2, y1);
arrow.addPoint(x + getArrowWidth(), y2);
arrow.addPoint(x, y2);
arrow.addPoint(x + getArrowWidth()/2, y1);
} else {
int y = height / 2 - getArrowWidth()/2;
int x1 = (up ? ARROW_IND : barLength - ARROW_IND);
int x2 = (up ? getArrowWidth() : barLength - getArrowWidth() - ARROW_IND);
arrow.addPoint(x1, y + getArrowWidth()/2);
arrow.addPoint(x2, y + getArrowWidth());
arrow.addPoint(x2, y);
arrow.addPoint(x1, y + getArrowWidth()/2);
}
return arrow;
}
/**
* Gets the area of the scroll track
*/
protected abstract Rectangle getThumbArea();
/**
* paint the scrollbar
* @param g the graphics context to paint into
* @param colors the colors to use when painting the scrollbar
* @param width the width of the scrollbar
* @param height the height of the scrollbar
* @param paintAll paint the whole scrollbar if true, just the thumb is false
*/
void paint(Graphics g, Color colors[], boolean paintAll) {
if (log.isLoggable(PlatformLogger.Level.FINER)) {
log.finer("Painting scrollbar " + this);
}
boolean useBufferedImage = false;
Graphics2D g2 = null;
BufferedImage buffer = null;
if (!(g instanceof Graphics2D)) {
// Fix for 5045936, 5055171. While printing, g is an instance
// of sun.print.ProxyPrintGraphics which extends Graphics.
// So we use a separate buffered image and its graphics is
// always Graphics2D instance
X11GraphicsConfig graphicsConfig = (X11GraphicsConfig)(sb.getEventSource().getGraphicsConfiguration());
buffer = graphicsConfig.createCompatibleImage(width, height);
g2 = buffer.createGraphics();
useBufferedImage = true;
} else {
g2 = (Graphics2D)g;
}
try {
Rectangle thumbRect = calculateThumbRect();
// if (prevH == thumbH && prevY == thumbPosY) {
// return;
// }
prevThumb = thumbRect;
// TODO: Share Motif colors
Color back = colors[XComponentPeer.BACKGROUND_COLOR];
Color selectColor = new Color(MotifColorUtilities.calculateSelectFromBackground(back.getRed(),back.getGreen(),back.getBlue()));
Color darkShadow = new Color(MotifColorUtilities.calculateBottomShadowFromBackground(back.getRed(),back.getGreen(),back.getBlue()));
Color lightShadow = new Color(MotifColorUtilities.calculateTopShadowFromBackground(back.getRed(),back.getGreen(),back.getBlue()));
XToolkit.awtLock();
try {
XlibWrapper.XFlush(XToolkit.getDisplay());
} finally {
XToolkit.awtUnlock();
}
/* paint the background slightly darker */
if (paintAll) {
// fill the entire background
g2.setColor(selectColor);
if (alignment == ALIGNMENT_HORIZONTAL) {
g2.fillRect(0, 0, thumbRect.x, height);
g2.fillRect(thumbRect.x + thumbRect.width , 0, width - (thumbRect.x + thumbRect.width), height);
} else {
g2.fillRect(0, 0, width, thumbRect.y);
g2.fillRect(0, thumbRect.y + thumbRect.height, width, height - (thumbRect.y + thumbRect.height));
}
// Paint edges
// TODO: Share Motif 3d rect drawing
g2.setColor(darkShadow);
g2.drawLine(0, 0, width-1, 0); // top
g2.drawLine(0, 0, 0, height-1); // left
g2.setColor(lightShadow);
g2.drawLine(1, height-1, width-1, height-1); // bottom
g2.drawLine(width-1, 1, width-1, height-1); // right
} else {
// Clear all thumb area
g2.setColor(selectColor);
Rectangle thumbArea = getThumbArea();
g2.fill(thumbArea);
}
if (paintAll) {
// ************ paint the arrows
paintArrows(g2, colors[XComponentPeer.BACKGROUND_COLOR], darkShadow, lightShadow );
}
// Thumb
g2.setColor(colors[XComponentPeer.BACKGROUND_COLOR]);
g2.fillRect(thumbRect.x, thumbRect.y, thumbRect.width, thumbRect.height);
g2.setColor(lightShadow);
g2.drawLine(thumbRect.x, thumbRect.y,
thumbRect.x + thumbRect.width, thumbRect.y); // top
g2.drawLine(thumbRect.x, thumbRect.y,
thumbRect.x, thumbRect.y+thumbRect.height); // left
g2.setColor(darkShadow);
g2.drawLine(thumbRect.x+1,
thumbRect.y+thumbRect.height,
thumbRect.x+thumbRect.width,
thumbRect.y+thumbRect.height); // bottom
g2.drawLine(thumbRect.x+thumbRect.width,
thumbRect.y+1,
thumbRect.x+thumbRect.width,
thumbRect.y+thumbRect.height); // right
} finally {
if (useBufferedImage) {
g2.dispose();
}
}
if (useBufferedImage) {
g.drawImage(buffer, 0, 0, null);
}
XToolkit.awtLock();
try {
XlibWrapper.XFlush(XToolkit.getDisplay());
} finally {
XToolkit.awtUnlock();
}
}
void paintArrows(Graphics2D g, Color background, Color darkShadow, Color lightShadow) {
g.setColor(background);
// paint firstArrow
if (pressed && (mode == AdjustmentEvent.UNIT_DECREMENT)) {
g.fill(firstArrow);
g.setColor(lightShadow);
g.drawLine(firstArrow.xpoints[0],firstArrow.ypoints[0],
firstArrow.xpoints[1],firstArrow.ypoints[1]);
g.drawLine(firstArrow.xpoints[1],firstArrow.ypoints[1],
firstArrow.xpoints[2],firstArrow.ypoints[2]);
g.setColor(darkShadow);
g.drawLine(firstArrow.xpoints[2],firstArrow.ypoints[2],
firstArrow.xpoints[0],firstArrow.ypoints[0]);
}
else {
g.fill(firstArrow);
g.setColor(darkShadow);
g.drawLine(firstArrow.xpoints[0],firstArrow.ypoints[0],
firstArrow.xpoints[1],firstArrow.ypoints[1]);
g.drawLine(firstArrow.xpoints[1],firstArrow.ypoints[1],
firstArrow.xpoints[2],firstArrow.ypoints[2]);
g.setColor(lightShadow);
g.drawLine(firstArrow.xpoints[2],firstArrow.ypoints[2],
firstArrow.xpoints[0],firstArrow.ypoints[0]);
}
g.setColor(background);
// paint second Arrow
if (pressed && (mode == AdjustmentEvent.UNIT_INCREMENT)) {
g.fill(secondArrow);
g.setColor(lightShadow);
g.drawLine(secondArrow.xpoints[0],secondArrow.ypoints[0],
secondArrow.xpoints[1],secondArrow.ypoints[1]);
g.setColor(darkShadow);
g.drawLine(secondArrow.xpoints[1],secondArrow.ypoints[1],
secondArrow.xpoints[2],secondArrow.ypoints[2]);
g.drawLine(secondArrow.xpoints[2],secondArrow.ypoints[2],
secondArrow.xpoints[0],secondArrow.ypoints[0]);
}
else {
g.fill(secondArrow);
g.setColor(darkShadow);
g.drawLine(secondArrow.xpoints[0],secondArrow.ypoints[0],
secondArrow.xpoints[1],secondArrow.ypoints[1]);
g.setColor(lightShadow);
g.drawLine(secondArrow.xpoints[1],secondArrow.ypoints[1],
secondArrow.xpoints[2],secondArrow.ypoints[2]);
g.drawLine(secondArrow.xpoints[2],secondArrow.ypoints[2],
secondArrow.xpoints[0],secondArrow.ypoints[0]);
}
}
/**
* Tell the scroller to start scrolling.
*/
void startScrolling() {
if (log.isLoggable(PlatformLogger.Level.FINER)) {
log.finer("Start scrolling on " + this);
}
// Make sure that we scroll at least once
scroll();
// wake up the scroll repeater
if (scroller == null) {
// If there isn't a scroller, then create
// one and start it.
scroller = new XScrollRepeater(this);
} else {
scroller.setScrollbar(this);
}
scroller.start();
}
/**
* Tell the instance scroller to start scrolling.
* See 6243382 for more information
*/
void startScrollingInstance() {
if (log.isLoggable(PlatformLogger.Level.FINER)) {
log.finer("Start scrolling on " + this);
}
// Make sure that we scroll at least once
scroll();
i_scroller.setScrollbar(this);
i_scroller.start();
}
/**
* Tell the instance scroller to stop scrolling.
* See 6243382 for more information
*/
void stopScrollingInstance() {
if (log.isLoggable(PlatformLogger.Level.FINER)) {
log.finer("Stop scrolling on " + this);
}
i_scroller.stop();
}
/**
* The set method for mode property.
* See 6243382 for more information
*/
public void setMode(int mode){
this.mode = mode;
}
/**
* Scroll one unit.
* @see notifyValue
*/
void scroll() {
switch (mode) {
case AdjustmentEvent.UNIT_DECREMENT:
notifyValue(val - line);
return;
case AdjustmentEvent.UNIT_INCREMENT:
notifyValue(val + line);
return;
case AdjustmentEvent.BLOCK_DECREMENT:
notifyValue(val - page);
return;
case AdjustmentEvent.BLOCK_INCREMENT:
notifyValue(val + page);
return;
}
return;
}
boolean isInArrow(int x, int y) {
// Mouse is considered to be in the arrow if it is anywhere in the
// arrow area.
int coord = (alignment == ALIGNMENT_HORIZONTAL ? x : y);
int arrAreaH = getArrowAreaWidth();
if (coord < arrAreaH || coord > barLength - arrAreaH + 1) {
return true;
}
return false;
}
/**
* Is x,y in the scroll thumb?
*
* If we ever cache the thumb rect, we may need to clone the result of
* calculateThumbRect().
*/
boolean isInThumb(int x, int y) {
Rectangle thumbRect = calculateThumbRect();
// If the mouse is in the shadow of the thumb or the shadow of the
// scroll track, treat it as hitting the thumb. So, slightly enlarge
// our rectangle.
thumbRect.x -= 1;
thumbRect.width += 3;
thumbRect.height += 1;
return thumbRect.contains(x,y);
}
abstract boolean beforeThumb(int x, int y);
/**
*
* @see java.awt.event.MouseEvent
* MouseEvent.MOUSE_CLICKED
* MouseEvent.MOUSE_PRESSED
* MouseEvent.MOUSE_RELEASED
* MouseEvent.MOUSE_MOVED
* MouseEvent.MOUSE_ENTERED
* MouseEvent.MOUSE_EXITED
* MouseEvent.MOUSE_DRAGGED
*/
public void handleMouseEvent(int id, int modifiers, int x, int y) {
if ((modifiers & InputEvent.BUTTON1_MASK) == 0) {
return;
}
if (log.isLoggable(PlatformLogger.Level.FINER)) {
String type;
switch (id) {
case MouseEvent.MOUSE_PRESSED:
type = "press";
break;
case MouseEvent.MOUSE_RELEASED:
type = "release";
break;
case MouseEvent.MOUSE_DRAGGED:
type = "drag";
break;
default:
type = "other";
}
log.finer("Mouse " + type + " event in scroll bar " + this +
"x = " + x + ", y = " + y +
", on arrow: " + isInArrow(x, y) +
", on thumb: " + isInThumb(x, y) + ", before thumb: " + beforeThumb(x, y)
+ ", thumb rect" + calculateThumbRect());
}
switch (id) {
case MouseEvent.MOUSE_PRESSED:
if (isInArrow(x, y)) {
pressed = true;
if (beforeThumb(x, y)) {
mode = AdjustmentEvent.UNIT_DECREMENT;
} else {
mode = AdjustmentEvent.UNIT_INCREMENT;
}
sb.repaintScrollbarRequest(this);
startScrolling();
break;
}
if (isInThumb(x, y)) {
mode = AdjustmentEvent.TRACK;
} else {
if (beforeThumb(x, y)) {
mode = AdjustmentEvent.BLOCK_DECREMENT;
} else {
mode = AdjustmentEvent.BLOCK_INCREMENT;
}
startScrolling();
}
Rectangle pos = calculateThumbRect();
thumbOffset = new Point(x - pos.x, y - pos.y);
break;
case MouseEvent.MOUSE_RELEASED:
pressed = false;
sb.repaintScrollbarRequest(this);
scroller.stop();
if(dragging){
handleTrackEvent(x, y, false);
dragging=false;
}
break;
case MouseEvent.MOUSE_DRAGGED:
dragging = true;
handleTrackEvent(x, y, true);
}
}
private void handleTrackEvent(int x, int y, boolean isAdjusting){
if (mode == AdjustmentEvent.TRACK) {
notifyValue(calculateCursorOffset(x, y), isAdjusting);
}
}
private int calculateCursorOffset(int x, int y){
if (alignment == ALIGNMENT_HORIZONTAL) {
if (dragging)
return Math.max(0,(int)((x - (thumbOffset.x + getArrowAreaWidth()))/getScaleFactor())) + min;
else
return Math.max(0,(int)((x - (getArrowAreaWidth()))/getScaleFactor())) + min;
} else {
if (dragging)
return Math.max(0,(int)((y - (thumbOffset.y + getArrowAreaWidth()))/getScaleFactor())) + min;
else
return Math.max(0,(int)((y - (getArrowAreaWidth()))/getScaleFactor())) + min;
}
}
/*
private void updateNeedsRepaint() {
Rectangle thumbRect = calculateThumbRect();
if (!prevThumb.equals(thumbRect)) {
needsRepaint = true;
}
prevThumb = thumbRect;
}
*/
/**
* Sets the values for this Scrollbar.
* This method enforces the same constraints as in java.awt.Scrollbar:
* <UL>
* <LI> The maximum must be greater than the minimum
* <LI> The value must be greater than or equal to the minimum
* and less than or equal to the maximum minus the
* visible amount </LI>
* <LI> The visible amount must be greater than 1 and less than or equal
* to the difference between the maximum and minimum values. </LI>
* </UL>
* Values which do not meet these criteria are quietly coerced to the
* appropriate boundary value.
* @param value is the position in the current window.
* @param visible is the amount visible per page
* @param minimum is the minimum value of the scrollbar
* @param maximum is the maximum value of the scrollbar
*/
synchronized void setValues(int value, int visible, int minimum, int maximum) {
if (maximum <= minimum) {
maximum = minimum + 1;
}
if (visible > maximum - minimum) {
visible = maximum - minimum;
}
if (visible < 1) {
visible = 1;
}
if (value < minimum) {
value = minimum;
}
if (value > maximum - visible) {
value = maximum - visible;
}
this.val = value;
this.vis = visible;
this.min = minimum;
this.max = maximum;
}
/**
* Sets param of this Scrollbar to the specified values.
* @param value is the position in the current window.
* @param visible is the amount visible per page
* @param minimum is the minimum value of the scrollbar
* @param maximum is the maximum value of the scrollbar
* @param unitSize is the unit size for increment or decrement of the value
* @param page is the block size for increment or decrement of the value
* @see #setValues
*/
synchronized void setValues(int value, int visible, int minimum, int maximum,
int unitSize, int blockSize) {
/* Use setValues so that a consistent policy
* relating minimum, maximum, and value is enforced.
*/
setValues(value, visible, minimum, maximum);
setUnitIncrement(unitSize);
setBlockIncrement(blockSize);
}
/**
* Returns the current value of this Scrollbar.
* @see #getMinimum
* @see #getMaximum
*/
int getValue() {
return val;
}
/**
* Sets the value of this Scrollbar to the specified value.
* @param value the new value of the Scrollbar. If this value is
* below the current minimum or above the current maximum minus
* the visible amount, it becomes the new one of those values,
* respectively.
* @see #getValue
*/
synchronized void setValue(int newValue) {
/* Use setValues so that a consistent policy
* relating minimum, maximum, and value is enforced.
*/
setValues(newValue, vis, min, max);
}
/**
* Returns the minimum value of this Scrollbar.
* @see #getMaximum
* @see #getValue
*/
int getMinimum() {
return min;
}
/**
* Sets the minimum value for this Scrollbar.
* @param minimum the minimum value of the scrollbar
*/
synchronized void setMinimum(int newMinimum) {
/* Use setValues so that a consistent policy
* relating minimum, maximum, and value is enforced.
*/
setValues(val, vis, newMinimum, max);
}
/**
* Returns the maximum value of this Scrollbar.
* @see #getMinimum
* @see #getValue
*/
int getMaximum() {
return max;
}
/**
* Sets the maximum value for this Scrollbar.
* @param maximum the maximum value of the scrollbar
*/
synchronized void setMaximum(int newMaximum) {
/* Use setValues so that a consistent policy
* relating minimum, maximum, and value is enforced.
*/
setValues(val, vis, min, newMaximum);
}
/**
* Returns the visible amount of this Scrollbar.
*/
int getVisibleAmount() {
return vis;
}
/**
* Sets the visible amount of this Scrollbar, which is the range
* of values represented by the width of the scroll bar's bubble.
* @param visible the amount visible per page
*/
synchronized void setVisibleAmount(int newAmount) {
setValues(val, newAmount, min, max);
}
/**
* Sets the unit increment for this scrollbar. This is the value
* that will be added (subtracted) when the user hits the unit down
* (up) gadgets.
* @param unitSize is the unit size for increment or decrement of the value
*/
synchronized void setUnitIncrement(int unitSize) {
line = unitSize;
}
/**
* Gets the unit increment for this scrollbar.
*/
int getUnitIncrement() {
return line;
}
/**
* Sets the block increment for this scrollbar. This is the value
* that will be added (subtracted) when the user hits the block down
* (up) gadgets.
* @param blockSize is the block size for increment or decrement of the value
*/
synchronized void setBlockIncrement(int blockSize) {
page = blockSize;
}
/**
* Gets the block increment for this scrollbar.
*/
int getBlockIncrement() {
return page;
}
/**
* Width of the arrow image
*/
int getArrowWidth() {
return getArrowAreaWidth() - 2*ARROW_IND;
}
/**
* Width of the area reserved for arrow
*/
int getArrowAreaWidth() {
return arrowArea;
}
void calculateArrowWidth() {
if (barLength < 2*barWidth + MIN_THUMB_H + 2) {
arrowArea = (barLength - MIN_THUMB_H + 2*ARROW_IND)/2 - 1;
}
else {
arrowArea = barWidth - 1;
}
}
/**
* Returns the scale factor for the thumbArea ( thumbAreaH / (max - min)).
* @see #getArrowAreaSize
*/
private double getScaleFactor(){
double f = (double)(barLength - 2*getArrowAreaWidth()) / Math.max(1,(max - min));
return f;
}
/**
* Method to calculate the scroll thumb's size and position. This is
* based on CalcSliderRect in ScrollBar.c of Motif source.
*
* If we ever cache the thumb rect, we'll need to use a clone in
* isInThumb().
*/
protected Rectangle calculateThumbRect() {
float range;
float trueSize; // Area of scroll track
float factor;
float slideSize;
int minSliderWidth;
int minSliderHeight;
int hitTheWall = 0;
int arrAreaH = getArrowAreaWidth();
Rectangle retVal = new Rectangle(0,0,0,0);
trueSize = barLength - 2*arrAreaH - 1; // Same if vert or horiz
if (alignment == ALIGNMENT_HORIZONTAL) {
minSliderWidth = MIN_THUMB_H ; // Base on user-set vis?
minSliderHeight = height - 3;
}
else { // Vertical
minSliderWidth = width - 3;
minSliderHeight = MIN_THUMB_H ;
}
// Total number of user units displayed
range = max - min;
// A naive notion of pixels per user unit
factor = trueSize / range;
// A naive notion of the size of the slider in pixels
// in thermo, slider_size is 0 ans is ignored
slideSize = vis * factor;
if (alignment == ALIGNMENT_HORIZONTAL) {
// Simulating MAX_SCROLLBAR_DIMENSION macro
int localVal = (int) (slideSize + 0.5);
int localMin = minSliderWidth;
if (localVal > localMin) {
retVal.width = localVal;
}
else {
retVal.width = localMin;
hitTheWall = localMin;
}
retVal.height = minSliderHeight;
}
else { // Vertical
retVal.width = minSliderWidth;
// Simulating MAX_SCROLLBAR_DIMENSION macro
int localVal = (int) (slideSize + 0.5);
int localMin = minSliderHeight;
if (localVal > localMin) {
retVal.height = localVal;
}
else {
retVal.height = localMin;
hitTheWall = localMin;
}
}
if (hitTheWall != 0) {
trueSize -= hitTheWall; // Actual pixels available
range -= vis; // Actual range
factor = trueSize / range;
}
if (alignment == ALIGNMENT_HORIZONTAL) {
retVal.x = ((int) (((((float) val)
- ((float) min)) * factor) + 0.5))
+ arrAreaH;
retVal.y = 1;
}
else {
retVal.x = 1;
retVal.y = ((int) (((((float) val)
- ((float) min)) * factor) + 0.5))
+ arrAreaH;
}
// There was one final adjustment here in the Motif function, which was
// noted to be for backward-compatibility. It has been left out for now.
return retVal;
}
public String toString() {
return getClass() + "[" + width + "x" + height + "," + barWidth + "x" + barLength + "]";
}
}
class XScrollRepeater implements Runnable {
/**
* Time to pause before the first scroll repeat.
*/
static int beginPause = 500;
// Reminder - make this a user definable property
/**
* Time to pause between each scroll repeat.
*/
static int repeatPause = 100;
// Reminder - make this a user definable property
/**
* The scrollbar that we sending scrolling.
*/
XScrollbar sb;
/**
* newScroll gets reset when a new scrollbar gets set.
*/
boolean newScroll;
boolean shouldSkip;
/**
* Creates a new scroll repeater.
* @param sb the scrollbar that this thread will scroll
*/
XScrollRepeater(XScrollbar sb) {
this.setScrollbar(sb);
newScroll = true;
}
public void start() {
stop();
shouldSkip = false;
XToolkit.schedule(this, beginPause);
}
public void stop() {
synchronized(this) {
shouldSkip = true;
}
XToolkit.remove(this);
}
/**
* Sets the scrollbar.
* @param sb the scrollbar that this thread will scroll
*/
public synchronized void setScrollbar(XScrollbar sb) {
this.sb = sb;
stop();
newScroll = true;
}
public void run () {
synchronized(this) {
if (shouldSkip) {
return;
}
}
sb.scroll();
XToolkit.schedule(this, repeatPause);
}
}
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