/** * Calculates the preferred size dimensions for the specified panel given the components in the * specified parent container. * * @see #minimumLayoutSize * @param target The component to be laid out. * @return A size deemed suitable for laying out the container. */ public Dimension preferredLayoutSize(Container target) { int count; Container parent; Component component; Point point; Dimension dimension; Insets insets; Dimension ret; synchronized (target.getTreeLock()) { count = target.getComponentCount(); if (0 == count) { // be the same size unless we have a parent ret = target.getSize(); parent = target.getParent(); if (null != parent) { insets = parent.getInsets(); ret = parent.getSize(); ret.setSize( ret.width - insets.left - insets.right, ret.height - insets.top - insets.bottom); } } else { ret = new Dimension(0, 0); for (int i = 0; i < count; i++) { component = target.getComponent(i); if (component.isVisible()) { point = component.getLocation(); dimension = component.getPreferredSize(); ret.width = Math.max(ret.width, point.x + dimension.width); ret.height = Math.max(ret.height, point.y + dimension.height); } } insets = target.getInsets(); ret.width += insets.left + insets.right; ret.height += insets.top + insets.bottom; } } return (ret); }