private void updatePointerRect() {
if (seq == null || seq.getLength() == 0) {
ptrRect.x = 0;
} else {
ptrRect.x = (int) (getWidth() * seq.getThumbPosition() / seq.getLength() - PTR_WIDTH / 2);
}
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
int ptrPos;
if (seq == null || seq.getLength() == 0) {
ptrPos = 0;
} else {
ptrPos =
(int) (SIDE_PAD + (getWidth() - 2 * SIDE_PAD) * seq.getThumbPosition() / seq.getLength());
}
final int x = SIDE_PAD;
final int y = (PTR_HEIGHT - BAR_HEIGHT) / 2;
int right = getWidth() - SIDE_PAD;
g2.setClip(new RoundRectangle2D.Float(x, y, right - x, BAR_HEIGHT, ROUND, ROUND));
g2.setPaint(new GradientPaint(0, y, Color.DARK_GRAY, 0, y + BAR_HEIGHT, Color.GRAY));
g2.fillRect(x, y, ptrPos - x, BAR_HEIGHT);
g2.setPaint(new GradientPaint(0, y, Color.LIGHT_GRAY, 0, y + BAR_HEIGHT, Color.WHITE));
g2.fillRect(ptrPos, y, right - ptrPos, BAR_HEIGHT);
g2.setClip(null);
g2.setColor(Color.BLACK);
g2.drawRoundRect(x, y, right - x - 1, BAR_HEIGHT, ROUND, ROUND);
if ((mouseHovering || seq.isDragging()) && this.isEnabled()) {
int left = ptrPos - PTR_WIDTH / 2;
final Color PTR_COLOR_1 = Color.WHITE;
final Color PTR_COLOR_2 = Color.LIGHT_GRAY;
g2.setPaint(new GradientPaint(left, 0, PTR_COLOR_1, left + PTR_WIDTH, 0, PTR_COLOR_2));
g2.fillOval(left, 0, PTR_WIDTH, PTR_HEIGHT);
g2.setColor(Color.BLACK);
g2.drawOval(left, 0, PTR_WIDTH - 1, PTR_HEIGHT - 1);
}
}