将背景色设置为TreeCellRenderer时出现问题

Question

嗨，我已经创建了我自己的渲染器。我希望背景应该是蓝色的。我也将背景颜色设置为蓝色。但我不知道是什么问题，我的渲染器的背景颜色似乎总是白色。

我已经发布了代码。如果我错了，请帮我把背景颜色改成白色。

class CheckTreeCellRenderer extends JPanel implements TreeCellRenderer {

private CheckTreeSelectionModel selectionModel;
private MyRenderer 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(MyRenderer delegate, CheckTreeSelectionModel selectionModel) {
    this.delegate = delegate;

    this.selectionModel = selectionModel;
    setLayout(new BorderLayout());
    setOpaque(true);
    setBackground(new Color(207, 219, 234));
    checkBox.setState(Boolean.TRUE);

    checkBox.setOpaque(true);
    checkBox.setBackground(new Color(207, 219, 234));
}

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);
        }
    }

    renderer.setBackground(new Color(207, 219, 234));
    tree.setOpaque(true);
    tree.setBackground(new Color(207, 219, 234));
    this.setOpaque(true);
    this.setBackground(new Color(207, 219, 234));

    add(checkBox, BorderLayout.WEST);
    add(renderer, BorderLayout.CENTER);

    return this;
}

}

Answer 1

如果不看剩下的代码，就很难判断。

我猜代理的渲染器很可能包含一个白色背景的不透明组件。代码仅将渲染器设置为蓝色，渲染器包含的组件(如果有)不会被上面的代码调整。

Answer 2

你没有提出任何例外吗？你确定你的getTreeCellRendererComponent方法至少被调用了一个吗？