/**
* Updates the scroll bar's value.
*
* @param component The scroll bar.
* @param scrollType Unit or block scrolling.
* @param scrollAmount The amount of scrolling.
* @param wheelRotation <tt>-1</tt> or <tt>1</tt> for backward or forward scrolling, respectively.
* @param x The x-coordinate of the event in the scroll bar's coordinate space.
* @param y The y-coordinate of the event in the scroll bar's coordinate space.
*/
@Override
public boolean mouseWheel(
Component component,
Mouse.ScrollType scrollType,
int scrollAmount,
int wheelRotation,
int x,
int y) {
boolean consumed = false;
ScrollBar scrollBar = (ScrollBar) getComponent();
int previousValue = scrollBar.getValue();
int newValue = previousValue + (scrollAmount * wheelRotation * scrollBar.getUnitIncrement());
if (wheelRotation > 0) {
int maxValue = scrollBar.getEnd() - scrollBar.getExtent();
newValue = Math.min(newValue, maxValue);
if (previousValue < maxValue) {
consumed = true;
}
} else {
newValue = Math.max(newValue, 0);
if (previousValue > 0) {
consumed = true;
}
}
scrollBar.setValue(newValue);
return consumed;
}
private void scroll() {
ScrollBar scrollBar = (ScrollBar) TerraScrollBarSkin.this.getComponent();
int start = scrollBar.getStart();
int end = scrollBar.getEnd();
int extent = scrollBar.getExtent();
int value = scrollBar.getValue();
int adjustment;
if (incrementType == Mouse.ScrollType.UNIT) {
adjustment = direction * scrollBar.getUnitIncrement();
} else {
adjustment = direction * scrollBar.getBlockIncrement();
}
if (adjustment < 0) {
int newValue = Math.max(value + adjustment, start);
scrollBar.setValue(newValue);
if (stopValue != -1 && newValue < stopValue) {
// We've reached the explicit stop value
stop();
}
if (newValue == start) {
// We implicit stop at the minimum scroll bar value
stop();
}
} else {
int newValue = Math.min(value + adjustment, end - extent);
scrollBar.setValue(newValue);
if (stopValue != -1 && newValue > stopValue) {
// We've reached the explicit stop value
stop();
}
if (newValue == end - extent) {
// We implicitly stop at the maximum scroll bar value
stop();
}
}
}