public abstract static class AbstractLayoutCache.NodeDimensions extends Object
AbstractLayoutCache用于确定特定节点的大小和x起点。 
      | Constructor and Description | 
|---|
| NodeDimensions() | 
public abstract Rectangle getNodeDimensions(Object value, int row, int depth, boolean expanded, Rectangle bounds)
null ,则应返回新创建的Rectangle ,否则该值应放置在边界并返回。 
          value -的 
            value被表示 
           row - 正在查询的行 
           depth - 行的深度 
           expanded - 如果行被展开,则为true,否则为false 
           bounds - a 
            Rectangle包含所需的大小,代表 
            value 
           Rectangle包含节点的尺寸,或 
            null如果节点没有尺寸 
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