Лучший способ настройки размера вкладки в JTextPane

Question

Мне было интересно, есть ли лучший способ настройки размера вкладок?

FontMetrics fm = textPane.getFontMetrics(textPane.getFont()); // deprecated! 
int cw = fm.stringWidth(" "); 
float f = (float) cw; 
TabStop[] tabs = new TabStop[50]; // this sucks 

for (int i = 0; i < tabs.length; i++) { 
    tabs[i] = new TabStop(f * (i + 1), TabStop.ALIGN_LEFT, TabStop.LEAD_NONE); 
} 

TabSet tabset = new TabSet(tabs); 
StyleContext sc = StyleContext.getDefaultStyleContext(); 
AttributeSet aset = sc.addAttribute(SimpleAttributeSet.EMPTY, StyleConstants.TabSet, tabset); 
textPane.setParagraphAttributes(aset, false); 

Answer 1

От the link

import javax.swing.text.*; 
import javax.swing.*; 

public class TabSizeEditorKit extends StyledEditorKit { 

    public static final int TAB_SIZE=36; 

    public ViewFactory getViewFactory() { 
     return new MyViewFactory(); 
    } 

    static class MyViewFactory implements ViewFactory { 

     public View create(Element elem) { 
      String kind = elem.getName(); 
      if (kind != null) { 
       if (kind.equals(AbstractDocument.ContentElementName)) { 
        return new LabelView(elem); 
       } else if (kind.equals(AbstractDocument.ParagraphElementName)) { 
        return new CustomTabParagraphView(elem); 
       } else if (kind.equals(AbstractDocument.SectionElementName)) { 
        return new BoxView(elem, View.Y_AXIS); 
       } else if (kind.equals(StyleConstants.ComponentElementName)) { 
        return new ComponentView(elem); 
       } else if (kind.equals(StyleConstants.IconElementName)) { 
        return new IconView(elem); 
       } 
      } 

      return new LabelView(elem); 
     } 
    } 

    public static void main(String[] args) { 
     JFrame frame=new JFrame("Custom default Tab Size in EditorKit example"); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

     JEditorPane edit=new JEditorPane(); 
     edit.setEditorKit(new TabSizeEditorKit()); 
     try { 
      edit.getDocument().insertString(0,"1\t2\t3\t4\t5", new SimpleAttributeSet()); 
     } catch (BadLocationException e) { 
      e.printStackTrace(); 
     } 
     frame.getContentPane().add(new JScrollPane(edit)); 

     frame.setSize(300,100); 
     frame.setLocationRelativeTo(null); 
     frame.setVisible(true); 
    } 


    static class CustomTabParagraphView extends ParagraphView { 

     public CustomTabParagraphView(Element elem) { 
      super(elem); 
     } 

     public float nextTabStop(float x, int tabOffset) { 
      TabSet tabs = getTabSet(); 
      if(tabs == null) { 
       // a tab every 72 pixels. 
       return (float)(getTabBase() + (((int)x/TAB_SIZE + 1) * TAB_SIZE)); 
      } 

      return super.nextTabStop(x, tabOffset); 
     } 

    } 
}