Custom EditField di Blackberry

EditField di Blackberry secara default di tampilkan dalam bentuk yang sangat kaku (mungkin ini pendapat pribadi saya), ia akan memakai semua width dari resolusi. Sehingga jika kita ingin menambah button di samping EditField maka button tersebut tidak akan tampil. Agar bisa tampil maka perlu untuk melakukan custom terhadap EditField tersebut.
Berikut code Custom EditField.

import net.rim.device.api.system.Characters;
import net.rim.device.api.system.Display;
import net.rim.device.api.ui.Color;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Font;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.Manager;
import net.rim.device.api.ui.component.EditField;

public class TextFieldCustom extends Manager {
    
    private final static int DEFAULT_LEFT_MARGIN = 1;
    private final static int DEFAULT_RIGHT_MARGIN = 1;
    private final static int DEFAULT_TOP_MARGIN = 3;
    private final static int DEFAULT_BOTTOM_MARGIN = 1;
     
    private final static int DEFAULT_LEFT_PADDING = 5; 
    private final static int DEFAULT_RIGHT_PADDING = 5;
    private final static int DEFAULT_TOP_PADDING = 3; 
    private final static int DEFAULT_BOTTOM_PADDING = 3;
     
    private int topMargin = DEFAULT_TOP_MARGIN;
    private int bottomMargin = DEFAULT_BOTTOM_MARGIN;
    private int leftMargin = DEFAULT_LEFT_MARGIN;
    private int rightMargin = DEFAULT_RIGHT_MARGIN;
     
    private int topPadding = DEFAULT_TOP_PADDING;
    private int bottomPadding = DEFAULT_BOTTOM_PADDING;
    private int leftPadding = DEFAULT_LEFT_PADDING;
    private int rightPadding = DEFAULT_RIGHT_PADDING;
     
    private int totalHorizontalEmptySpace = leftMargin + leftPadding + rightPadding + rightMargin;
    private int totalVerticalEmptySpace = topMargin + topPadding + bottomPadding + bottomMargin;
     
    private int minHeight = 21 + totalVerticalEmptySpace;
    private int width;
    private int height = minHeight;
    private int text_colour = 0xFF0000;
    private int border_color = 0x000066;
    private int background_color = 0xFFFF99;
    private String label = "";
    private Font headingFont = getFont().derive(Font.PLAIN, 20);
    private EditField editField;
    
    public TextFieldCustom(){
        super(0);
        this.label = "";
        this.width = Display.getWidth()/2;
        editField = new EditField();
        add(editField);
    }

    public TextFieldCustom(long style){
        super(0);
        this.label = "";
        this.width = Display.getWidth()/2;
        editField = new EditField(style);
        add(editField);
    }
    
    public TextFieldCustom(int panjang){
        super(0);
        this.label = "";
        this.width = panjang;
        editField = new EditField();
        add(editField);
    }
    
    public TextFieldCustom(int panjang, long style){
        super(0);
        this.label = "";
        this.width = panjang;
        editField = new EditField(style);
        add(editField);
    }
     
    protected void sublayout(int width, int height)
    {
        Field field = getField(0);
        layoutChild(field, this.width - totalHorizontalEmptySpace , this.height - totalVerticalEmptySpace);
        setPositionChild(field, leftMargin+leftPadding, topMargin+topPadding);
        setExtent(this.width, this.height);
    }     
     
    protected void paint(Graphics graphics){     
        graphics.setColor(border_color);
        graphics.drawRoundRect(leftMargin, topMargin, width - (leftMargin+rightMargin), height - (topMargin+bottomMargin), 7, 7);
        graphics.setColor(background_color);
        graphics.fillRoundRect(leftMargin+1, topMargin+1, (width - (leftMargin+rightMargin))-2, (height- (topMargin+bottomMargin))-2, 7, 7);
        
        graphics.setColor(Color.BLACK);
        if(headingFont!=null){
            setFont(headingFont);
            graphics.drawText(label, 2, 10);
        }else{
            graphics.drawText(label, 2, 7);
        }
        
        graphics.setColor(text_colour);
        EditField ef = (EditField)getField(0);
        String entireText = ef.getText();
        
        boolean longText = false;
        String textToDraw = "";
        Font font = headingFont;
        int availableWidth = width - totalHorizontalEmptySpace;
        if (font.getAdvance(entireText) <= availableWidth)
        {
            textToDraw = entireText;
        }
        else
        {
            int endIndex = entireText.length();
            for (int beginIndex = 1; beginIndex < endIndex; beginIndex++)
            {
                textToDraw = entireText.substring(beginIndex);
                if (font.getAdvance(textToDraw) <= availableWidth)
                {
                    longText = true;
                    break;
                }
            }
        }
        
        if (longText == true)
        {        
            ef.setText(textToDraw);          
            super.paint(graphics); 
            ef.setText(entireText);
        }
        else
        {
            super.paint(graphics);
        }
         
    }
     
    public int getPreferredWidth(){
        return width;
    }
     
    public int getPreferredHeight(){
        return height;
    }
     
    protected boolean keyChar(char ch, int status, int time){        
       if (ch == Characters.ENTER)
       {
            return true;
       }     
       else
       {
            return super.keyChar(ch, status, time);
       }
    } 
   
    protected void onUnfocus() {
       super.onUnfocus();
    }
   
    protected void onFocus(int direction) {
       super.onFocus(direction);
    }
  
    protected void drawFocus(Graphics graphics, boolean on) {
       super.drawFocus(graphics, on);
    }

    public String getText(){
       return ((EditField) getField(0)).getText();
    }
         
    public void setText(final String text){
       ((EditField)getField(0)).setText(text);
    }  
}

Sekarang Tambahkan Code berikut di MainScreen untuk menampilkan TextFieldCustom.

   LabelField nama = new LabelField("Nama: ");        
   TextFieldCustom textField = new TextFieldCustom();
   ButtonField namaBtn = new ButtonField("OK");
        
   HorizontalFieldManager hfm = new HorizontalFieldManager();
   hfm.add(nama);
   hfm.add(textField);
   hfm.add(namaBtn);
   add(hfm); 

Outpunya: