限制文本框輸入用的DocumentFilter

Question

列/衝突的數目我有一個WWFormattedTextField：

public class WWFormattedTextField extends JFormattedTextField implements FocusListener { 

private DocumentFilter filter = new UppercaseDocumentFilter(); 
private boolean limitToMaxInput = false; 

public WWFormattedTextField() { 
    super(); 
    init(); 
} 

private void init() { 
    addFocusListener(this); 
//This line makes ALL text in ALL textfields uppercase as they type 
    ((AbstractDocument) this.getDocument()).setDocumentFilter(filter); 
} 

//This method uses value of colulmn property of textfield and creates a mask 
//that limits the amount of characters 
public void setLimitToMaxInput(boolean limitToMaxInput) { 
    int columns = getColumns(); 
    String patternLimit = ""; 
    while (columns > 0) { 
     patternLimit = patternLimit.concat("*"); 
     columns -= 1; 
    } 
    try { 
     setFormatterFactory(new javax.swing.text.DefaultFormatterFactory(new javax.swing.text.MaskFormatter(patternLimit))); 
    } catch (ParseException ex) { 
     Logger.getLogger(WWFormattedTextField.class.getName()).log(Level.SEVERE, null, ex); 
    } 
    this.limitToMaxInput = limitToMaxInput; 
} 

我的問題是，setLimitToMaxInput覆蓋UppercaseDocumentFilter。該字段限於列數，但由於掩碼是* - 當用戶鍵入時 - 它不會大寫......

需要一些有用的提示或建議以實現我的目標的正確方法：始終當達到最大大小（列）時限制（停止）用戶輸入的upprercase文本字段。

代碼爲UppercaseDocumentFilter：

public class UppercaseDocumentFilter extends DocumentFilter{ 
    @Override 
    public void insertString(DocumentFilter.FilterBypass fb, int offset, String text, AttributeSet attr) throws BadLocationException { 
     fb.insertString(offset, text.toUpperCase(), attr); 
    } 

    @Override 
    public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException { 
     fb.replace(offset, length, text.toUpperCase(), attrs); 
    } 
} 

Answer 1

我想通了閱讀this post

後，很顯然我沒有與笨重的屏蔽打擾，只是使用的DocumentFilter兩種：大寫和限制輸入。