import apple.laf.JRSUIConstants.State; //导入依赖的package包/类
public static UIResource getTreeExpandedIcon() {
    // public, because UIDefaults.ProxyLazyValue uses reflection to get this value
    return AquaIcon.getIconFor(new JRSUIControlSpec() {
        public void initIconPainter(final AquaPainter<? extends JRSUIState> painter) {
            painter.state.set(Widget.DISCLOSURE_TRIANGLE);
            painter.state.set(State.ACTIVE);
            painter.state.set(Direction.DOWN);
            painter.state.set(AlignmentHorizontal.CENTER);
            painter.state.set(AlignmentVertical.CENTER);
        }
    }, 20, 20);
}
 

import apple.laf.JRSUIConstants.State; //导入依赖的package包/类
public static UIResource getTreeCollapsedIcon() {
    // public, because UIDefaults.ProxyLazyValue uses reflection to get this value
    return AquaIcon.getIconFor(new JRSUIControlSpec() {
        public void initIconPainter(final AquaPainter<? extends JRSUIState> painter) {
            painter.state.set(Widget.DISCLOSURE_TRIANGLE);
            painter.state.set(State.ACTIVE);
            painter.state.set(Direction.RIGHT);
            painter.state.set(AlignmentHorizontal.CENTER);
            painter.state.set(AlignmentVertical.CENTER);
        }
    }, 20, 20);
}
 

import apple.laf.JRSUIConstants.State; //导入依赖的package包/类
public static UIResource getTreeRightToLeftCollapsedIcon() {
    // public, because UIDefaults.ProxyLazyValue uses reflection to get this value
    return AquaIcon.getIconFor(new JRSUIControlSpec() {
        public void initIconPainter(final AquaPainter<? extends JRSUIState> painter) {
            painter.state.set(Widget.DISCLOSURE_TRIANGLE);
            painter.state.set(State.ACTIVE);
            painter.state.set(Direction.LEFT);
            painter.state.set(AlignmentHorizontal.CENTER);
            painter.state.set(AlignmentVertical.CENTER);
        }
    }, 20, 20);
}
 

import apple.laf.JRSUIConstants.State; //导入依赖的package包/类
protected State getState(final JComponent c) {
    if (!AquaFocusHandler.isActive(c)) return State.INACTIVE;
    if (!c.isEnabled()) return State.DISABLED;
    return State.ACTIVE;
}
 

import apple.laf.JRSUIConstants.State; //导入依赖的package包/类
public void paintBorder(final Component c, final Graphics g, final int x, final int y, final int width, final int height) {
    final State state = getState((JComponent)c);
    painter.state.set(state);
    painter.state.set(isFocused(c) && state == State.ACTIVE ? Focused.YES : Focused.NO);
    painter.paint(g, c, x, y, width, height);
}
 

import apple.laf.JRSUIConstants.State; //导入依赖的package包/类
protected State getState() {
    return splitPane.isEnabled() ? State.ACTIVE : State.DISABLED;
}