protected void layoutVScrollbar(JScrollBar sb) {
if (AbstractLookAndFeel.getTheme().isLinuxStyleScrollBarOn()) {
Dimension sbSize = sb.getSize();
Insets sbInsets = sb.getInsets();
int sizeH = sbSize.height - sbInsets.top - sbInsets.bottom;
/*
* Width and left edge of the buttons and thumb.
*/
int itemX = sbInsets.left;
int itemW = sbSize.width - (sbInsets.left + sbInsets.right);
int itemH = Math.min(itemW, sizeH / 2);
/* Nominal locations of the buttons, assuming their preferred
* size will fit.
*/
int decrButtonY = sbSize.height - sbInsets.bottom - itemH - itemH + 1;
int incrButtonY = sbSize.height - sbInsets.bottom - itemH;
/* Compute the height and origin of the thumb. The case
* where the thumb is at the bottom edge is handled specially
* to avoid numerical problems in computing thumbY. Enforce
* the thumbs min/max dimensions. If the thumb doesn't
* fit in the track (trackH) we'll hide it later.
*/
float trackH = sbSize.height - sbInsets.top - sbInsets.bottom - itemW - itemW + 1;
float min = sb.getMinimum();
float max = sb.getMaximum();
float extent = sb.getVisibleAmount();
float range = max - min;
float value = sb.getValue();
int maxThumbH = getMaximumThumbSize().height;
int minThumbH = getMinimumThumbSize().height;
int thumbH = (range <= 0) ? maxThumbH : (int) (trackH * (extent / range));
thumbH = Math.max(thumbH, minThumbH);
thumbH = Math.min(thumbH, maxThumbH);
int thumbY = decrButtonY - thumbH;
if (value < (max - extent)) {
float thumbRange = trackH - thumbH;
thumbY = (int) (0.5f + (thumbRange * ((value - min) / (range - extent))));
}
/* If the thumb isn't going to fit, zero it's bounds. Otherwise
* make sure it fits between the buttons. Note that setting the
* thumbs bounds will cause a repaint.
*/
if (thumbH > trackH) {
setThumbBounds(0, 0, 0, 0);
} else {
setThumbBounds(itemX, thumbY, itemW, thumbH);
}
decrButton.setBounds(itemX, decrButtonY, itemW, itemH);
incrButton.setBounds(itemX, incrButtonY, itemW, itemH);
/* Update the trackRect field.
*/
trackRect.setBounds(itemX, 0, itemW, (int) trackH);
} else {
super.layoutVScrollbar(sb);
}
}
protected void layoutVScrollbar(JScrollBar sb) {
if (useAlternateLayout) alternateLayoutVScrollbar(sb);
else super.layoutVScrollbar(sb);
}
