Tabsize in JTextArea lässt sich nicht ändern

[hakker82]

Die tabsize einer JTextArea liegt bei etwa 20. Daher wollte ich sie gerne auf 8 setzen. Aber setTabSize(size) hat keine Wirkung. hat jemand eine Anhnung, wie man die Tabsize trotzzdem festlegt?

Danke.

 

[Sky]

Zeig mal deinen Code! setTabSize ist schon die richtige Methode dafür!

 

[hakker82]

Gerade eben hab' ich's hinbekommen. Man muss danach einfach auch die Schrift ändern.
Danke für deine Hilfe.

package muscodgui;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JSplitPane;
import javax.swing.JTree;
import javax.swing.JTabbedPane;
import javax.swing.JScrollPane;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.event.TreeSelectionListener;
import javax.swing.event.TreeSelectionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.Event;
import java.awt.Toolkit;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Font;
import java.io.File;
import java.io.FileReader;
import java.io.FileNotFoundException;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.ImageIcon;
import javax.swing.JTextArea;
import java.util.Properties;

public class MainFrame extends JFrame implements ActionListener, TreeSelectionListener {
	private MenuBar menuBar;
	private JTree tree;
	private JSplitPane splitPane;
	private Container content = getContentPane();
	private JTabbedPane tabPane = new JTabbedPane();
	private Chooser chooser;
	private String file = null;
	private String path = null;
	private DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer();
	private FileHandler cFile;
	private FileHandler dFile;
	private FileHandler tFile;
	private JTextArea cArea = new JTextArea();
	private JTextArea dArea = new JTextArea();
	private JTextArea tArea = new JTextArea();

	public MainFrame() {
		super("MuscodGui");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		addWindowListener(new WindowAdapter() {
         		public void WindowClosing(WindowEvent e) {
            			System.exit(0);
         		}
      		});
		
		/* add menu */
		menuBar = new MenuBar(this);
		setJMenuBar(menuBar);

		/* add tree */
		DefaultMutableTreeNode root = new DefaultMutableTreeNode("Modules");
		DefaultMutableTreeNode source = new DefaultMutableTreeNode("Source code");
		DefaultMutableTreeNode dat = new DefaultMutableTreeNode("Dat file");
		DefaultMutableTreeNode text = new DefaultMutableTreeNode("Text file");
		root.add(source); root.add(dat); root.add(text);
		ImageIcon leafIcon = new ImageIcon("muscodgui/module.gif");
		renderer.setLeafIcon(leafIcon);
		renderer.setOpenIcon(null);
		renderer.setClosedIcon(null);
		renderer.setBackgroundSelectionColor(null);
		renderer.setBorderSelectionColor(null);
		tree = new JTree(root);
		tree.setCellRenderer(renderer);
		tree.setShowsRootHandles(true);
		tree.addTreeSelectionListener(this);
		tree.expandRow(1);
		content.add(new JScrollPane(tree), BorderLayout.CENTER);
				
		/* add splitpane */
		splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,
				tree, tabPane);
		splitPane.setDividerSize(6);
		splitPane.setResizeWeight(0);
		content.add(splitPane, BorderLayout.CENTER);
		
		/* add tabs */
		cArea.setTabSize(8);
		cArea.setLineWrap(true);
		cArea.setWrapStyleWord(true);
		cArea.setFont(new Font("Courier", Font.PLAIN, 12));
		dArea.setTabSize(8);
		tArea.setTabSize(8);
		tabPane.addTab("Source code", cArea);
		tabPane.addTab("Dat file", dArea);
		tabPane.addTab("Text file", tArea);
		
		setLocation(	
			(Toolkit.getDefaultToolkit().getScreenSize().width - 800)/2,
			(Toolkit.getDefaultToolkit().getScreenSize().height - 600)/2
		);
		setSize(800, 600);
		setVisible(true);
	}

		
	public void actionPerformed(ActionEvent e) {
		Object obj = e.getSource();
		String cmd = e.getActionCommand();
		if (obj instanceof JMenuItem && cmd != null) {
			System.out.println("Menu: " + cmd);
			if (cmd.equals("new")) {
				/* create file */
			}
			if (cmd.equals("open")) {
				chooser = new Chooser(cmd);
				int returnVal = chooser.showOpenDialog(this);
				if (returnVal == Chooser.APPROVE_OPTION) { 
					File rfile = chooser.getSelectedFile();
					file = rfile.getName();
					path = rfile.getParent();
					open();
				}
			}
			if (cmd.equals("save")) {
				/* save file */
			}
			if (cmd.equals("saveAs")) {
				chooser = new Chooser(cmd);
				int returnVal = chooser.showSaveDialog(this);
				if (returnVal == Chooser.APPROVE_OPTION) { 
					File rfile = chooser.getSelectedFile();
					file = rfile.getName();
					path = rfile.getParent();
					/* save file */
				}
			}
			if (cmd.equals("exit")) {
				System.exit(0);
			}
		}
	}

	public void valueChanged(TreeSelectionEvent e) {
		Object obj = e.getSource();
		String cmd = null;
		try {	/* can throw a NullPointerException, but it doesn't matter */
			cmd = tree.getLastSelectedPathComponent().toString();
		} catch(Exception ev) {}
		if (obj instanceof JTree && cmd != null) {
			if (!cmd.equals("Modules")) {
				System.out.println("Tree: " + cmd);
			}
			if (cmd.equals("Source code")) {
				tabPane.setSelectedIndex(0);
			}
			if (cmd.equals("Dat file")) {
				tabPane.setSelectedIndex(1);
			}
			if (cmd.equals("Text file")) {
				tabPane.setSelectedIndex(2);
			}
		}
	}

	private void open() {
		if (file != null && path != null) {
			int point = file.lastIndexOf('.');
			String fileOnlyName = file.substring(0, point);
			String sep = System.getProperty("file.separator");
			if (!path.endsWith(sep)) {
				path = path.concat(sep);
			}
			try {	
				cFile = new FileHandler(new FileReader(path + "src" + sep + fileOnlyName + ".c"));
			} catch (Exception e) {
				cFile = null;
				System.out.println(e);
			}
			try {
				dFile = new FileHandler(new FileReader(path + "dat" + sep + fileOnlyName + ".dat"));
			} catch (Exception e2) {
				dFile = null;
				System.out.println(e2);
			}
			try {
				tFile = new FileHandler(new FileReader(path + "txt" + sep + fileOnlyName + ".txt"));
			} catch (Exception e3) {
				tFile = null;
				System.out.println(e3);
			}
			try {
				tabPane.removeTabAt(0);
				tabPane.removeTabAt(0);
				tabPane.removeTabAt(0);
			} catch (Exception e4) {}

			try {
				cArea = new JTextArea();
				cArea.append(cFile.getFile());
			} catch (Exception e5) {
				System.out.println(e5);
			}
			try {
				dArea = new JTextArea();
				dArea.append(dFile.getFile());
			} catch (Exception e6) {
				System.out.println(e6);
			}
			try {
				tArea = new JTextArea();
				tArea.append(tFile.getFile());
			} catch (Exception e7) {
				System.out.println(e7);
			}
			tabPane.addTab(fileOnlyName + ".c", cArea);
			tabPane.addTab(fileOnlyName + ".dat", dArea);
			tabPane.addTab(fileOnlyName + ".txt", tArea);
		}
	}
}

 

[elmato]

ist tabsize( 8 ) nicht der default wert?