jtextarea

问题 how can I count the number of line breaks in a JTextArea? Is there a simple example? Any suggestions? Thanks you in advance! 回答1: Here is a program from this: import java.awt.*; import java.awt.event.*; import java.awt.font.*; import java.text.*; import javax.swing.*; public class JTextAreaLineCountDemo extends JPanel { JTextArea textArea; static Font f = new Font("Helvetiva", Font.ITALIC, 50); public JTextAreaLineCountDemo() { super(new GridBagLayout()); String inputStr = "Lorem ipsum dolor

问题 I hope I did not miss some duplicate question, I feel like this should be trivial! Anyway, I have a JTextArea with text in it, with automatic line wraps: public PleaseResize(){ super(); Container cp = this.getContentPane(); JTextArea area = new JTextArea(); area.setColumns(20); area.setLineWrap(true); area.setEditable(false); area.setWrapStyleWord(true); area.setText("Once upon a midnight dreary, while I pondered, weak and weary, over many a quaint an curious volume of forgotten lore."); cp

问题 Hi I have the following code : AbstractDocument d = (AbstractDocument)editorText.getDocument(); d.setDocumentFilter(new myFilter()); where editorText is a JTextArea. and my DocumentFiler is defined as follows : private class myFilter extends DocumentFilter{ public void insertString(DocumentFilter.FilterBypass fb, int offset, String string, AttributeSet attr){ System.out.print("insert invoked"); try { super.insertString(fb, offset, "; You inserted the string: "+string, attr); } catch

问题 Here's the code. It prints out the mouse location when it's in the panel but not the JTextArea. I added the mouse listener to the text area as well? The problem is that the coordinates are not consistent throughout the JFrame. Is there a way to just have one mouselistener that covers the entire jframe? Is there a way to disable the mouse listener in the textarea? import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.event.MouseEvent; import java.awt

问题 I have a Text Area swing element where I want to display some execution logs. messages should appear after each execution step. e.g. "Fetching has been started". But the problem is that all logs messages appear only once after the button action performed event is completed.Below is the way I used to display some text getXmlButton = new JButton("Fetch Reports"); getXmlButton.addActionListener((new ActionListener() { @Override public void actionPerformed(ActionEvent e) { createDirectory();

问题 I'm trying to set a documentFilter for my JTextArea. Having overriden the insert(...) method I admitted that it is never called. What's wrong? A piece of code: package jaba; import javax.swing.*; import javax.swing.text.*; import java.awt.*; public class Main extends JFrame { public Main() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setSize(640, 480); setLayout(new FlowLayout()); add(txt); Document doc = txt.getDocument(); if (doc instanceof AbstractDocument) { ((AbstractDocument)doc)

问题 I have a document listener, and it's indirect source, JTextArea (JTextArea.getDocument().addDocumentListener etc..). I need my listener to have access to JTextArea, but without referencing. Something similar to event.getSource() from action and key listeners... I'm aware that the source of the listener is the document, not JTextArea itself, but I need to get to it. Any suggestions? 回答1: A Document is the model of a text component, and Swing is built for a single model to be able to be used by

问题 I know this seems to be a stupid question, but so far all the answers I found ask me to use html tags. Is there a easier way to do it? The TextArea may change size. 回答1: Override the insertString method of the Document , so that whenever a string is inserted, the extra characters are removed and an ellipsis is inserted. Here is an example: JTextArea area = new JTextArea(); area.setDocument(new PlainDocument() { private static final long serialVersionUID = 1L; private static final int MAX =

问题 Right I already worked out that JTextArea or JTextField don't support HTML. I want to add text to a "screen" like a JTextArea and later keep appending text to it. I tried with JTextArea which worked wonderfully, but it does not support formatting it seems... So I tried using JEditorPane's subclass JTextPane, but this one does not have it's append function... Can someone guid me in the right direction how I easily can append text to a JTextPane or format a JTextArea. Or if there is any other

问题 I am writing a GUI with a button. When the user clicks the button, I would like a "Beginning work..." message to appear in a JTextArea immediately, and a "Finished." message to appear when the work is done. The GUI contains some code of the form private void buttonActionPerformed(java.awt.event.ActionEvent evt) { myJTextArea.append("Beginning work...\n"); <more lines of code> myJTextArea.append("Finished.\n"); } Unfortunately, neither message appears until the end. Is there a way to flush