/**
* Stores the position and size of the bouncing box that would be painted for the current
* animation index in <code>r</code> and returns <code>r</code>. Subclasses that add to the
* painting performed in this class's implementation of <code>paintIndeterminate</code> -- to draw
* an outline around the bouncing box, for example -- can use this method to get the location of
* the bouncing box that was just painted. By overriding this method, you have complete control
* over the size and position of the bouncing box, without having to reimplement <code>
* paintIndeterminate</code>.
*
* @param r the Rectangle instance to be modified; may be <code>null</code>
* @return <code>null</code> if no box should be drawn; otherwise, returns the passed-in rectangle
* (if non-null) or a new rectangle
* @see #setAnimationIndex
* @since 1.4
*/
protected Rectangle getBox(Rectangle r) {
int currentFrame = getAnimationIndex();
int middleFrame = numFrames / 2;
if (sizeChanged() || delta == 0.0 || maxPosition == 0.0) {
updateSizes();
}
r = getGenericBox(r);
if (r == null) {
return null;
}
if (middleFrame <= 0) {
return null;
}
// assert currentFrame >= 0 && currentFrame < numFrames
if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
if (currentFrame < middleFrame) {
r.x = componentInnards.x + (int) Math.round(delta * (double) currentFrame);
} else {
r.x = maxPosition - (int) Math.round(delta * (currentFrame - middleFrame));
}
} else { // VERTICAL indeterminate progress bar
if (currentFrame < middleFrame) {
r.y = componentInnards.y + (int) Math.round(delta * currentFrame);
} else {
r.y = maxPosition - (int) Math.round(delta * (currentFrame - middleFrame));
}
}
return r;
}
/**
* This determines the amount of the progress bar that should be filled based on the percent done
* gathered from the model. This is a common operation so it was abstracted out. It assumes that
* your progress bar is linear. That is, if you are making a circular progress indicator, you will
* want to override this method.
*/
protected int getAmountFull(Insets b, int width, int height) {
int amountFull = 0;
BoundedRangeModel model = progressBar.getModel();
if ((model.getMaximum() - model.getMinimum()) != 0) {
if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
amountFull = (int) Math.round(width * progressBar.getPercentComplete());
} else {
amountFull = (int) Math.round(height * progressBar.getPercentComplete());
}
}
return amountFull;
}
/**
* Designate the place where the progress string will be painted. This implementation places it at
* the center of the progress bar (in both x and y). Override this if you want to right, left,
* top, or bottom align the progress string or if you need to nudge it around for any reason.
*/
protected Point getStringPlacement(
Graphics g, String progressString, int x, int y, int width, int height) {
FontMetrics fontSizer = SwingUtilities2.getFontMetrics(progressBar, g, progressBar.getFont());
int stringWidth = SwingUtilities2.stringWidth(progressBar, fontSizer, progressString);
if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
return new Point(
x + Math.round(width / 2 - stringWidth / 2),
y
+ ((height + fontSizer.getAscent() - fontSizer.getLeading() - fontSizer.getDescent())
/ 2));
} else { // VERTICAL
return new Point(
x
+ ((width - fontSizer.getAscent() + fontSizer.getLeading() + fontSizer.getDescent())
/ 2),
y + Math.round(height / 2 - stringWidth / 2));
}
}
/**
* Returns the length of the "bouncing box" to be painted. This method is invoked by the default
* implementation of <code>paintIndeterminate</code> to get the width (if the progress bar is
* horizontal) or height (if vertical) of the box. For example:
*
* <blockquote>
*
* <pre>
* boxRect.width = getBoxLength(componentInnards.width,
* componentInnards.height);
* </pre>
*
* </blockquote>
*
* @param availableLength the amount of space available for the bouncing box to move in; for a
* horizontal progress bar, for example, this should be the inside width of the progress bar
* (the component width minus borders)
* @param otherDimension for a horizontal progress bar, this should be the inside height of the
* progress bar; this value might be used to constrain or determine the return value
* @return the size of the box dimension being determined; must be no larger than <code>
* availableLength</code>
* @see javax.swing.SwingUtilities#calculateInnerArea
* @since 1.5
*/
protected int getBoxLength(int availableLength, int otherDimension) {
return (int) Math.round(availableLength / 6.0);
}