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我尝试使用自定义 TreeRenderer 制作 JTree

public class TextCellRender implements TreeCellRenderer {
    JPanel panel;
    JTextArea text;
    JLabel label;
    LayoutManager Layout;

    public TextCellRender() {
        text = new JTextArea();
        text.setWrapStyleWord(true);
        text.setLineWrap(true);
        text.setSize(360, text.getPreferredSize().height);
        label = new JLabel();
        panel = new JPanel();
        panel.add(label);
        panel.add(text);
    }

    @Override
    public Component getTreeCellRendererComponent(JTree tree, Object value, 
            boolean selected, boolean expanded, boolean leaf,
            int row, boolean hasFocus) {
        Component returnValue = null;
        if ((value != null) && (value instanceof DefaultMutableTreeNode)) {
            Object userObject = ((DefaultMutableTreeNode) value).getUserObject();
            if ((userObject instanceof FieldObj)) {
                FieldObj my = (FieldObj) userObject;
                String fieldText = "";

                text.setText(my.valueList);
                label.setText(my.FieldName);

            }
            return panel;
        }
        return returnValue;
    }
}

并使用自定义编辑器

public class TextCellEdit extends AbstractCellEditor implements TreeCellEditor {

其中 getTreeCellEditorComponent 将面板返回为 getTreeCellEditorComponent 但使用 JComboBox 从数据库填充项目。渲染和编辑器工作得很好我可以点击字段和组合框显示来自 db 的值。

public Component getTreeCellEditorComponent(JTree tree, Object value, 
        boolean isSelected, boolean expanded, boolean leaf, int row) {
    if (value != null && value instanceof DefaultMutableTreeNode) {
        Object userObject = ((DefaultMutableTreeNode) value).getUserObject();
        if (userObject instanceof FieldObj) {
            FieldObj my = (FieldObj) userObject;
            box.removeAllItems();
            label.setText(my.FieldName);
            populatebox(my.FieldName);
            box.addItem(my.valueList);
            panel.add(label);
            panel.add(box);
        } else {
            box.addItem("Uknown object type");
        }
        return panel;
    }
}
public Object getCellEditorValue() { 
    System.out.println("getCellEditoValue returns :" + box.getSelectedItem());
    return box.getSelectedItem();
}

但它没有保存在渲染 textArea 我的意思是在渲染中我有面板：
JLabel (FieldName)
JTextArea (FieldValue)

当我点击 JTextArea 我有我的编辑器，它有：
JLabel (FieldName)
JComboBox(FieldValues which I have paid from db)

但是当我从 Edit ComboBox 中选择某些内容时，它不会保存在 Render TextArea 中所以问题是这些东西应该如何工作？

渲染组件如何从 Edit 组件中获取价值？

4

1 回答 1

1

当您实现TreeCellEditor时，您必须重写public Object getCellEditorValue()方法。当您取消/退出编辑时，该方法会调用。在此方法中，您可以将新值保存到存储在 TreeNode 中的对象中。然后您的渲染器在方法中获得了具有新值的编辑对象getTreeCellRendererComponent。

编辑：你的编辑是这样的：

public class TextCellEdit extends AbstractCellEditor implements TreeCellEditor {

private JComboBox<Object> box;
private JLabel label;
private JPanel panel;
private FieldObj my;

public Component getTreeCellEditorComponent(JTree tree, Object value,
        boolean isSelected, boolean expanded, boolean leaf, int row) {

    if (value != null && value instanceof DefaultMutableTreeNode) {
        Object userObject = ((DefaultMutableTreeNode) value)
                .getUserObject();
        if (userObject instanceof FieldObj) {
            my = (FieldObj) userObject;
            box.removeAllItems();
            label.setText(my.FieldName);
            populatebox(my.FieldName);
            box.addItem(my.valueList);
            panel.add(label);
            panel.add(box);
        } else {
            box.addItem("Uknown object type");
        }
        return panel;
    }
}

public Object getCellEditorValue() { 
    System.out.println("getCellEditoValue returns :" + box.getSelectedItem());
    my.FieldName = box.getSelectedItem();
    return box.getSelectedItem();
}
}
于 2013-10-31T12:42:58.690 回答