How can I put this Jtree into a Split pane

[Marcus Rivera]

I would like to put a JTree into a splitPane but

[/code FileBrowser testing=new FileBrowser();]


and then doing [code=java][/code splitPane.setLeftComponent(testing);]

I recieve the error (The method setLeftComponent(Component) in the type JSplitPane is not applicable for the arguments (FileBrowser))





[code=java][ /code import java.io.File;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;

public class FileBrowser implements Runnable {

    private DefaultMutableTreeNode root;

    private DefaultTreeModel treeModel;

    private JTree tree;

    @Override
    public void run() {
        JFrame frame = new JFrame("File Browser");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        File fileRoot = new File("C:/");
        root = new DefaultMutableTreeNode(new FileNode(fileRoot));
        treeModel = new DefaultTreeModel(root);

        tree = new JTree(treeModel);
        tree.setShowsRootHandles(true);
        JScrollPane scrollPane = new JScrollPane(tree);

        frame.add(scrollPane);
        frame.setLocationByPlatform(true);
        frame.setSize(640, 480);
        frame.setVisible(true);

        CreateChildNodes ccn = 
                new CreateChildNodes(fileRoot, root);
        new Thread(ccn).start();
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new FileBrowser());
    }

    public class CreateChildNodes implements Runnable {

        private DefaultMutableTreeNode root;

        private File fileRoot;

        public CreateChildNodes(File fileRoot, 
                DefaultMutableTreeNode root) {
            this.fileRoot = fileRoot;
            this.root = root;
        }

        @Override
        public void run() {
            createChildren(fileRoot, root);
        }

        private void createChildren(File fileRoot, 
                DefaultMutableTreeNode node) {
            File[] files = fileRoot.listFiles();
            if (files == null) return;

            for (File file : files) {
                DefaultMutableTreeNode childNode = 
                        new DefaultMutableTreeNode(new FileNode(file));
                node.add(childNode);
                if (file.isDirectory()) {
                    createChildren(file, childNode);
                }}}}

    public class FileNode {

        private File file;

        public FileNode(File file) {
            this.file = file;
        }

        @Override
        public String toString() {
            String name = file.getName();
            if (name.equals("")) {
                return file.getAbsolutePath();
            } else {
                return name;
            }}}}]



[code=java]

Please let me know if you need any further clarifications. Thank you

[Alexander Bonasera]

The setLeftComponent method requires a Component as an argument. Your FileBrowser object does not extend the class Component or one of it's subclasses so it is not a Component. A quick look at your code makes me think you may be wanting to use the JTree field in your FileBrowser as the argument for setLeftComponent instead.

[Marcus Rivera]

Alexander Bonasera wrote:The setLeftComponent method requires a Component as an argument. Your FileBrowser object does not extend the class Component or one of it's subclasses so it is not a Component. A quick look at your code makes me think you may be wanting to use the JTree field in your FileBrowser as the argument for setLeftComponent instead.

Thank you for your reply. How do you think I should call the JTree field in FileBrowser so I could put it in the setLeftComponent?

[Alexander Bonasera]

Since you are calling setLeftComponent from outside the FileBrowser class one option would be to make a public accessor for the JTree field in the FileBrowser class, and then call that accessor as the argument in the setLeftComponent method.

[Marcus Rivera]

Alexander Bonasera wrote:Since you are calling setLeftComponent from outside the FileBrowser class one option would be to make a public accessor for the JTree field in the FileBrowser class, and then call that accessor as the argument in the setLeftComponent method.

So i made Jtree tree public in the FileBrowser class

I did [ FileBrowser testing=new FileBrowser();]


and then did[ splitPane.setLeftComponent(testing.tree);]

Did I do it correctly because it does not seem to be doing anything

[Paul Clapham]

Marcus Rivera wrote:...because it does not seem to be doing anything

That could cover a multitude of sins. Could you perhaps be more specific about what it isn't doing? I'm sure there is a list of things you expected to see; surely you are seeing some of them? On the other hand if you don't see any of the GUI at all then it would help if you said so.

[Paul Clapham]

I just looked a bit more at your code. If I read it right, it's supposed to be filling a JTree with all of the files on your C drive. The last time I looked, my Windows C drive had over a quarter of a million files on it. So you might just have to wait longer for your table to appear. Or maybe you're getting an out-of-memory error. Are you running your code in such a way that you can see if it writes output (e.g. stack trace) to the console?

P.S. I'm going to move the thread to the Swing forum.

[Stephan van Hulst]

It's probably because you are also adding the tree to a scroll pane. A component can have only one parent.

Don't make the field public. Just add the JTree to a JScrollPane, add the JScrollPane to a JSplitPane, and add the JSplitPane to the JFrame.

If it's still not working, show us the code including where you've tried to add the JTree.

[Rob Camick]

This as been asked in other forums: https://stackoverflow.com/questions/60291922/how-can-i-put-this-jtree-into-a-split-pane

The OP has just completely reposted the same question without attempting to implement any of the suggestions given.

[Marcus Rivera]

Stephan van Hulst wrote:It's probably because you are also adding the tree to a scroll pane. A component can have only one parent.

Don't make the field public. Just add the JTree to a JScrollPane, add the JScrollPane to a JSplitPane, and add the JSplitPane to the JFrame.

If it's still not working, show us the code including where you've tried to add the JTree.

This worked perfectly, thank you very much

[Campbell Ritchie]

MR: please don't edit a post to add so much information. Please put the new class in a new post. I have reverted the changes.