jtextcomponent

I'm using DocumentFilter to restrict input as integer or decimal. And the code I post here is working well for that. Can anybody help me about how to restrict the input length or range in the given code? Thanks!! class MyIntFilter extends DocumentFilter { public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr) throws BadLocationException { Document doc = fb.getDocument(); StringBuilder sb = new StringBuilder(); sb.append(doc.getText(0, doc.getLength())); sb.insert(offset, string); if (test(sb.toString())) { super.insertString(fb, offset, string, attr); } else {

I'm currently working on a console window in Swing. It's based on a JTextArea and works like a common command line. You type a command in one line and press enter. In the next line, the output is shown and under that output, you could write the next command. Now I want, that you could only edit the current line with your command. All lines above (old commands and results) should be non editable. How can I do this? You do not need to create your own component. This can be done (as in I have done it) using a custom DocumentFilter . You can get the document from textPane.getDocument() and set a

as part of my java learning I made a jForm using netbeans which contains three jTextFields for the user to enter some numbers and then the sum of those numbres is displayed in another jTextField. This is, of course, extremely easy, but I want to be able to do this without any buttons. I don't know how to "update" the sum everytime any of the 3 textfields is modified. Can anyone help me? Here's my code (the form was done with netbeans in the design mode): package sumfields; public class Frame extends javax.swing.JFrame { public Frame() { initComponents(); } @SuppressWarnings("unchecked") //

How to determine number of the first visible line and the number of lines currently visible in scrollable JTextArea (JTextArea inside a JScrollPane)? Okay, this is my take on the problem... (Nice question though) There is a small consideration you need to have with this solution. It will return partially displayed lines. public class TestTextArea { public static void main(String[] args) { new TestTextArea(); } public TestTextArea() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch

In all the examples that I can find that use a JTextArea , the height & width is known before constructing the JTextArea , and if the JTextArea would require more height, then it is put inside of a JScrollPane . Obviously, the height of JTextArea is dependent on the width and the text contents. Now, my situation requires that I do not use a JScrollPane , but instead that the JTextArea be just tall enough to display all the text. When I create the JTextArea , I know the text contents and how much width it will have to work with; I don't know the height - I want that to be as small as possible

I have to write the content of textarea into a file with line breaks. I got the output like, it is written as one string in the file. public void actionPerformed(ActionEvent ev) { text.setVisible(true); String str= text.getText(); System.out.println(str); try { BufferedWriter fileOut = new BufferedWriter(new FileWriter("filename.txt")); fileOut.write(str); fileOut.close(); } catch (IOException ioe) { ioe.printStackTrace(); } } Example Output should be: I am King. but it is showing: IamKing. Please get me some suggestions Use JTextComponent.write(Writer) : Stores the contents of the model into

What are the purposes of using TextAction from AbstractAction ? and how to use it for the following: Caret Selection in the JTextComponents KeyBindings trashgod While composing this answer , I recalled a venerable HTMLDocumentEditor by Charles Bell that illustrates the typical usage of the subclasses found in javax.swing.text.TextAction . That editor is listed among the credits of Metaphase Editor . This related example showing actions found in StyledEditorKit follows the same approach. All such actions are suitable for Key Bindings , and all operate on the current selection maintained by the