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我创建了一个以下渲染器，它使用复选框渲染 JTree，我想向不同的节点添加不同的颜色和图标。我该怎么做？请帮我。先感谢您。

class CheckTreeCellRenderer extends JPanel implements TreeCellRenderer {
private CheckTreeSelectionModel selectionModel;
private TreeCellRenderer delegate;
private TristateCheckBox checkBox = new TristateCheckBox("",null,true);
public static final State NOT_SELECTED = new State();
public static final State SELECTED = new State();
public static final State DONT_CARE = new State();

public CheckTreeCellRenderer(TreeCellRenderer delegate, CheckTreeSelectionModel selectionModel) {
    this.delegate =  delegate;
    this.selectionModel = selectionModel;
    setLayout(new BorderLayout());
    setOpaque(false);
    checkBox.setState(Boolean.TRUE);
    revalidate();
    checkBox.setOpaque(false);
}

public Component getTreeCellRendererComponent
        (JTree tree, Object value, boolean selected, boolean expanded,
        boolean leaf, int row, boolean hasFocus) {

    Component renderer = delegate.getTreeCellRendererComponent
            (tree, value, selected, expanded, leaf, row, hasFocus);

    TreePath path = tree.getPathForRow(row);

    if(path!=null){
        if(selectionModel.isPathSelected(path, true)) {
            checkBox.setState(Boolean.TRUE);
        }
        else {
            checkBox.setState
                    (selectionModel.isPartiallySelected(path) ? null : Boolean.FALSE);
        }
    }
    setBackground(Color.pink);

    removeAll();
    add(checkBox, BorderLayout.WEST);
    add(renderer, BorderLayout.CENTER);
    return this;
}

}

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2 回答 2

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了解 TreeCellRenderers 的最佳位置是教程（位于页面底部）。

而不是添加renderer到BorderLayout.CENTER，您可以添加您喜欢的任何颜色的不同图标。

于 2010-02-23T11:56:59.153 回答
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为了让您setBackground(Color.PINK)有任何可见的效果，您应该在构造函数中更改setOpaque(false)为setOpaque(true)。也就是说，我赞同@John 的建议，即您阅读 Sun 教程中的渲染器。

于 2010-02-23T12:03:43.770 回答