java swing中的JTree组件

Question

如何在Swing的JTree组件中更改节点和root的图标？

Answer 1

DefaultTreeCellRenderer使用setClosedIcon，setOpenIcon和setLeafIcon。

从How to Use Trees复制：

ImageIcon leafIcon = createImageIcon("images/middle.gif");
if (leafIcon != null) {
    DefaultTreeCellRenderer renderer = 
    new DefaultTreeCellRenderer();
    renderer.setLeafIcon(leafIcon);
    tree.setCellRenderer(renderer);
}

Answer 2

关于JTree的Sun Tutorial有一节介绍如何将TreeCellRenderer子类化以获取JTree中的节点和文本。

Answer 3

如果您要做的就是为封闭节点，叶子和打开的节点设置不同的图标，那么它非常直接。

//创建3个图标   private Icon customOpenIcon = new ImageIcon（“images / my_open.gif”）;   private Icon customClosedIcon = new ImageIcon（“images / my_closed.gif”）;   private Icon customLeafIcon = new ImageIcon（“images / my_leaf.gif”）;

//假设您创建了DefaultMutableTreeNode层次结构     DefaultMutableTreeNode rootNode = new ...     ...     JTree树=新的JTree（rootNode）;

DefaultTreeCellRenderer customRenderer = new DefaultTreeCellRenderer();
customRenderer.setOpenIcon(customOpenIcon);
customRenderer.setClosedIcon(customClosedIcon);
customRenderer.setLeafIcon(customLeafIcon);
tree.setCellRenderer(customRenderer );