Java Community | Help. Code. Learn.•2mo ago

set JTextPane to max possible size

I'm writing an application using swing and I want to stretch out the JTextPane to take whole possible space. For now, there is nothing in there except the JTextPane, but it takes only the space it needs, when due to aesthetics I want it to take whole possible space. Preferably I would like to do it with layouts, instead of using fixed size. Currently I use BorderLayout.

public class FileView extends JPanel {
    private ModelInterface model;
    private JTextPane textPane = new JTextPane();
    // creating TextPane
    public FileView(ModelInterface model) {
          this.model = model;
        
          add(textPane);

          refreshFile();
        
    }
    ...

    // thats how I append new lines to the TextPane. TextPane can also be modified from client view
    private void appendToPane(JTextPane textPane, String msg, Color c)
    {
        StyleContext sc = StyleContext.getDefaultStyleContext();
        AttributeSet aset = sc.addAttribute(SimpleAttributeSet.EMPTY, StyleConstants.Foreground, c);

        aset = sc.addAttribute(aset, StyleConstants.FontFamily, "Lucida Console");
        aset = sc.addAttribute(aset, StyleConstants.Alignment, StyleConstants.ALIGN_JUSTIFIED);

        int len = textPane.getDocument().getLength();
        textPane.setCaretPosition(len);
        textPane.setCharacterAttributes(aset, false);
        textPane.replaceSelection(msg);
    }
}

public class FileView extends JPanel {
    private ModelInterface model;
    private JTextPane textPane = new JTextPane();
    // creating TextPane
    public FileView(ModelInterface model) {
          this.model = model;
        
          add(textPane);

          refreshFile();
        
    }
    ...

    // thats how I append new lines to the TextPane. TextPane can also be modified from client view
    private void appendToPane(JTextPane textPane, String msg, Color c)
    {
        StyleContext sc = StyleContext.getDefaultStyleContext();
        AttributeSet aset = sc.addAttribute(SimpleAttributeSet.EMPTY, StyleConstants.Foreground, c);

        aset = sc.addAttribute(aset, StyleConstants.FontFamily, "Lucida Console");
        aset = sc.addAttribute(aset, StyleConstants.Alignment, StyleConstants.ALIGN_JUSTIFIED);

        int len = textPane.getDocument().getLength();
        textPane.setCaretPosition(len);
        textPane.setCharacterAttributes(aset, false);
        textPane.replaceSelection(msg);
    }
}

18 Replies

JavaBot•2mo ago

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dezodorantOP•2mo ago

anyone?

Madjosz•2mo ago

I don't see you using BorderLayout here. So if you add this it should work.

dezodorantOP•2mo ago

Thats how I use border layout:

public void createView() {   
        JScrollPane scrollPane = new JScrollPane(fileView);
        scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
        scrollPane.getVerticalScrollBar().setUnitIncrement(16);
        frame.getContentPane().add(scrollPane, BorderLayout.CENTER); // adding it to border layout here

        createMenu();

        frame.setSize(500,500);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

public void createView() {   
        JScrollPane scrollPane = new JScrollPane(fileView);
        scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
        scrollPane.getVerticalScrollBar().setUnitIncrement(16);
        frame.getContentPane().add(scrollPane, BorderLayout.CENTER); // adding it to border layout here

        createMenu();

        frame.setSize(500,500);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

Sorry for so late reply, I didnt notice the message

Madjosz•2mo ago

Ok, so here is a minimal working example for your case:

import java.awt.*;
import javax.swing.*;

public class TextFrame extends JFrame {
    
    private FileView fileView = new FileView();
    
    public void createView() {   
        JScrollPane scrollPane = new JScrollPane(fileView);
        scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
        getContentPane().add(scrollPane, BorderLayout.CENTER); // adding it to border layout here

        setSize(500,500);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }
    
    public static void main(String... args) {
        new TextFrame().createView();
    }
    
    private class FileView extends JPanel {
        private JTextPane textPane = new JTextPane();

        public FileView() {
            add(textPane);
            appendToPane("Hello world!");
        }

        private void appendToPane(String msg) {
            textPane.replaceSelection(msg);
        }
    }
}

import java.awt.*;
import javax.swing.*;

public class TextFrame extends JFrame {
    
    private FileView fileView = new FileView();
    
    public void createView() {   
        JScrollPane scrollPane = new JScrollPane(fileView);
        scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
        getContentPane().add(scrollPane, BorderLayout.CENTER); // adding it to border layout here

        setSize(500,500);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }
    
    public static void main(String... args) {
        new TextFrame().createView();
    }
    
    private class FileView extends JPanel {
        private JTextPane textPane = new JTextPane();

        public FileView() {
            add(textPane);
            appendToPane("Hello world!");
        }

        private void appendToPane(String msg) {
            textPane.replaceSelection(msg);
        }
    }
}

The problem here is that the JScrollPane is only a clipped viewer on the underlying FileView. The latter one is not attached to any parent component of which it could inherit any sizes.

dezodorantOP•2mo ago

so I have to attach it to something for it to inherit a size?

Madjosz•2mo ago

I am not sure, haven't worked with Swing that much lately but I think the scrolling could already be attached to some text component without wrapping it in a ScrollPane.

dezodorantOP•2mo ago

wdym? When I unwrap the fileView from JScrollPane, then the issue is the same, it's just not scrollable

dezodorantOP•2mo ago

Madjosz•2mo ago

Ah, you need to set the Layout of the FileView. Currently it uses FlowLayout.

public FileView() {
    super(new BorderLayout());
    add(textPane, BorderLayout.CENTER);
    appendToPane("Hello world!");
}

public FileView() {
    super(new BorderLayout());
    add(textPane, BorderLayout.CENTER);
    appendToPane("Hello world!");
}

Madjosz•2mo ago

dezodorantOP•2mo ago

it works! Thanks a lot

JavaBot•2mo ago

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dezodorantOP•2mo ago

For the future, how can I know that some layout allows it when other doesnt?

Madjosz•2mo ago

Usually you need to make sure that your used LayoutManager matches the given layout contraints. Since this a kind of old API it uses Object arguments everywhere and does not enforce anything in the type system. A more modern API would probably have warned you or even failed to build because the BorderLayout.CENTER is not supported by FlowLayout.

dezodorantOP•2mo ago

okay thanks'

JavaBot•2mo ago

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set JTextPane to max possible size

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