无法调整 JInternalFrame 的大小

Question

我在 JDesktopPane 中添加了 JTree 和一个 JInternalFrame。我想调整 JInternalFrame 的大小，但做不到 it.But 我可以在其中移动内部框架。

import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.OverlayLayout;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;

public class TableDiff {

public static void main(String[] args) {
    JDesktopPane panel = new JDesktopPane() {
       // @Override
       // public boolean isOptimizedDrawingEnabled() {
       //     return false;
       // }
    };
    panel.setLayout(new OverlayLayout(panel));
    JTree tree = new JTree();
    DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
    for (int i = 0; i < 10; i++) {
        DefaultMutableTreeNode node = new DefaultMutableTreeNode(i + "x");
        for (int j = 0; j < 5; j++) {
            node.add(new DefaultMutableTreeNode(i + "x"));
        }
        root.add(node);
    }
    tree.setModel(new DefaultTreeModel(root));
    JScrollPane tscrollpane = new JScrollPane(tree);

    JInternalFrame iFrame = new JInternalFrame("asd");
    iFrame.setClosable(true);
    iFrame.setMaximizable(true);
    iFrame.setResizable(true);
    iFrame.setIconifiable(true);
    iFrame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
   // tscrollpane.setAlignmentX(1.0f);
  //  tscrollpane.setAlignmentY(0.0f);
   // iFrame.setAlignmentX(0.0f);
   // iFrame.setAlignmentY(0.0f);
    panel.add(tscrollpane);
    panel.add(iFrame);

    iFrame.setVisible(true);

    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setContentPane(panel);
    frame.pack();
    frame.setVisible(true);
}
}

Answer 1

您的问题是 OverlayLayout 的使用。

只需删除以下行：

panel.setLayout(new OverlayLayout(panel));

此外，非常重要的是，不要忘记设置 JFrame 和 JInternalFrame 的首选尺寸！

根据 Oracle documentation for using Internal Frames with Java Swing (link):

You must set the size of the internal frame.
If you do not set the size of the internal frame, it will have zero size and thus never be visible. You can set the size using one of the following methods: setSize, pack, or setBounds.

无法调整 JInternalFrame 的大小

Couldn't Resize JInternalFrame

java

swing

jinternalframe