import com.apple.laf.AquaImageFactory.NineSliceMetrics; //导入依赖的package包/类
@Override
void paint(final Graphics2D g, final T stateToPaint) {
    if (metricsProvider == null) {
        AquaSingleImagePainter.paintFromSingleCachedImage(g, control, stateToPaint, boundsRect);
        return;
    }

    RecyclableJRSUISlicedImageControl slicesRef = slicedControlImages.get(stateToPaint);
    if (slicesRef == null) {
        final NineSliceMetrics metrics = metricsProvider.getNineSliceMetricsForState(stateToPaint);
        if (metrics == null) {
            AquaSingleImagePainter.paintFromSingleCachedImage(g, control, stateToPaint, boundsRect);
            return;
        }
        slicesRef = new RecyclableJRSUISlicedImageControl(control, stateToPaint, metrics);
        slicedControlImages.put(stateToPaint, slicesRef);
    }
    final SlicedImageControl slices = slicesRef.get();
    slices.paint(g, boundsRect.x, boundsRect.y, boundsRect.width, boundsRect.height);
}
 

import com.apple.laf.AquaImageFactory.NineSliceMetrics; //导入依赖的package包/类
@Override
public NineSliceMetrics getNineSliceMetricsForState(JRSUIState state) {
    if (state.is(Orientation.VERTICAL)) {
        return new NineSliceMetrics(5, 7, 0, 0, 3, 3, true, false, true);
    }
    return new NineSliceMetrics(7, 5, 3, 3, 0, 0, true, true, false);
}
 

import com.apple.laf.AquaImageFactory.NineSliceMetrics; //导入依赖的package包/类
RecyclableJRSUISlicedImageControl(final JRSUIControl control, final JRSUIState state, final NineSliceMetrics metrics) {
    super(metrics);
    this.control = control;
    this.state = state;
}
 

import com.apple.laf.AquaImageFactory.NineSliceMetrics; //导入依赖的package包/类
public NineSliceMetrics getNineSliceMetricsForState(JRSUIState state);