private static int getScrollAmount(Component c, MouseWheelEvent me, JScrollBar scrollBar) {
final int scrollBarWidth = scrollBar.getWidth();
final int ratio =
Registry.is("ide.smart.horizontal.scrolling") && scrollBarWidth > 0
? Math.max((int) Math.pow(c.getWidth() / scrollBarWidth, 2), 10)
: 10; // do annoying scrolling faster if smart scrolling is on
return me.getUnitsToScroll() * scrollBar.getUnitIncrement() * ratio;
}
private boolean doHorizontalScrolling(Component c, MouseWheelEvent me) {
final JScrollBar scrollBar = findHorizontalScrollBar(c);
if (scrollBar != null) {
if (scrollBar.hashCode() != myLastHorScrolledComponentHash) {
FeatureUsageTracker.getInstance().triggerFeatureUsed("ui.horizontal.scrolling");
myLastHorScrolledComponentHash = scrollBar.hashCode();
}
scrollBar.setValue(scrollBar.getValue() + getScrollAmount(c, me, scrollBar));
return true;
}
return false;
}
@Nullable
private static JScrollBar findHorizontalScrollBar(Component c) {
if (c == null) return null;
if (c instanceof JScrollPane) {
return ((JScrollPane) c).getHorizontalScrollBar();
}
if (isDiagramViewComponent(c)) {
final JComponent view = (JComponent) c;
for (int i = 0; i < view.getComponentCount(); i++) {
if (view.getComponent(i) instanceof JScrollBar) {
final JScrollBar scrollBar = (JScrollBar) view.getComponent(i);
if (scrollBar.getOrientation() == Adjustable.HORIZONTAL) {
return scrollBar;
}
}
}
}
return findHorizontalScrollBar(c.getParent());
}