与螺纹有关Jtable 作为 Jtree 节点 https://stackoverflow.com/questions/8839025/jtable-as-a-jtree-node我把 JTable 放到 JTree 中,但是JTree
视图在启动时未正确呈现,我该怎么办setPreferredSize
for JTable
, 因为PreferredScrollableViewportSize
缩小了JTable
带渲染TableHeader
+ one Row
, one Row
保持隐藏状态,但展开 Node(s) TreeRenderer 后会更改并重新绘制setPreferredSize
到预期的Dimension
import java.awt.*;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import javax.swing.tree.*;
public class TreeWithTableRenderer extends JFrame {
private static final long serialVersionUID = 1L;
private JTree tree;
public TreeWithTableRenderer() {
DefaultMutableTreeNode AA1 = new DefaultMutableTreeNode("AA1");
DefaultMutableTreeNode AA2 = new DefaultMutableTreeNode("AA2");
DefaultMutableTreeNode A = new DefaultMutableTreeNode("A");
A.add(AA1);
A.add(AA2);
DefaultMutableTreeNode BB1 = new DefaultMutableTreeNode("BB1");
DefaultMutableTreeNode BB2 = new DefaultMutableTreeNode("BB2");
DefaultMutableTreeNode B = new DefaultMutableTreeNode("B");
B.add(BB1);
B.add(BB2);
DefaultMutableTreeNode CC1 = new DefaultMutableTreeNode("CC1");
DefaultMutableTreeNode CC2 = new DefaultMutableTreeNode("CC2");
DefaultMutableTreeNode C = new DefaultMutableTreeNode("C");
C.add(CC1);
C.add(CC2);
DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
root.add(A);
root.add(B);
root.add(C);
tree = new JTree(root);
tree.setCellRenderer(new MyTableInTreeCellRenderer());
tree.setRowHeight(0);
JScrollPane jsp = new JScrollPane(tree);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
add(jsp, BorderLayout.CENTER);
pack();
setLocationRelativeTo(null);
}
class MyTableInTreeCellRenderer extends JPanel implements TreeCellRenderer {
private static final long serialVersionUID = 1L;
private JTable table;
public MyTableInTreeCellRenderer() {
super(new BorderLayout());
table = new JTable();
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane);
}
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
final String v = (String) ((DefaultMutableTreeNode) value).getUserObject();
table.setModel(new DefaultTableModel() {
private static final long serialVersionUID = 1L;
@Override
public int getRowCount() {
return 2;
}
@Override
public int getColumnCount() {
return 2;
}
@Override
public Object getValueAt(int row, int column) {
return v + ":" + row + ":" + column;
}
});
table.setPreferredScrollableViewportSize(table.getPreferredSize());
return this;
}
}
public static void main(String[] args) throws Exception {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new TreeWithTableRenderer().setVisible(true);
}
});
}
}
摆脱scrollPane,无论如何它都是功能失调的(到目前为止我同意Russell的观点:-)并使用适当的LayoutManager将表格及其标题添加到面板中:
public MyTableInTreeCellRenderer() {
super();
setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
table = new JTable();
add(table.getTableHeader());
add(table);
}
您可能需要稍微调整一下视觉效果,左侧和顶部边框线丢失 - 不完全确定哪个组件正常绘制它们,可能是滚动窗格
Edit
忘记了:在计算渲染组件所需的大小(在ui委托中完成,即VariableHeightLayoutCache)时查询scrollPane的prefSize的原因是scrollPane尚未配置标题。查询发生在面板添加到 rendererPane 之前,完整的配置在表的 addNotify 中完成,只有在将面板添加到层次结构之后才会发生
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