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Nice Work 
I have made the visibility of the code more clear please find it......But the credit goes to magfed....
package com.emx.forex.components;
import net.rim.device.api.ui.component.ObjectChoiceField;
import net.rim.device.api.ui.Graphics;
import java.lang.String;
import net.rim.device.api.ui.XYRect;
import net.rim.device.api.ui.Font;
public class CMyChoiceField extends ObjectChoiceField
{
/** Constants for the horizontal text alignment */
public static final int TEXT_HALINGMENT_LEFT = 0;
public static final int TEXT_HALINGMENT_CENTER = 1;
/** Array of choices */
String[] m_Choices;
/** Left margin of the field */
private int m_MarginLeft = 1;
/** Right margin of the field */
private int m_MarginRight = 1;
/** Top margin of the field */
private int m_MarginTop = 1;
/** Top margin of the field */
private int m_MarginBottom = 1;
/** Right margin of the text in the selectbox */
private int m_TextMarginRight = 5;
/** Left margin of the text in the selectbox */
private int m_TextMarginLeft = 5;
/** Horizonta text alingment */
private int m_HTextAlignment = TEXT_HALINGMENT_CENTER;
/** Width of the chpice box */
private int m_ChoiceFieldWidth;
/** Height of the field */
private int m_Height;
/** Determones is field focused */
private boolean m_isFocused = false;
/** Width of thr DropDown arrow */
private int m_DropDownArrowWidth;
/** Field default color */
private int m_DefBgColor = 0xffffff;
/** Field text default color */
private int m_DefTextColor = 0;
/** Field color when it is focused */
private int m_FocusedBgColor = 0xf6921e;
/** Field text color when it is focused */
private int m_FocusedTextColor = 0;
/** * Constructor. The width of choice box became as big as * maximum length of choice strings + text marfins + derop-down arrow width. * * @param String - label of the field * @param String[] - field choices */
public CMyChoiceField(String label, String[] choices)
{
super(label, choices);
m_Choices = choices;
// dimensions of selectable field
Font currFont = getFont();
m_DropDownArrowWidth = m_Height = currFont.getHeight();
m_ChoiceFieldWidth = currFont.getAdvance(choices[0]);
for (int i = 1; i < choices.length; i++)
{
if (m_ChoiceFieldWidth < currFont.getAdvance(choices[i]))
m_ChoiceFieldWidth = currFont.getAdvance(choices[i]);
}
m_ChoiceFieldWidth += m_TextMarginLeft + m_TextMarginRight + m_DropDownArrowWidth;
}
/** * Constructor. The width of choice box became as big as * maximum length of choice strings + text marfins + derop-down arrow width. * * @param String - label of the field * @param String[] - field choices * @param int - initial choice index */
public CMyChoiceField(String label, String[] choices, int initialIndex)
{
super(label, choices, initialIndex);
m_Choices = choices; // dimensions of selectable field
Font currFont = getFont();
m_DropDownArrowWidth = m_Height = currFont.getHeight();
m_ChoiceFieldWidth = currFont.getAdvance(choices[0]);
for (int i = 1; i < choices.length; i++)
{
if (m_ChoiceFieldWidth < currFont.getAdvance(choices[i]))
m_ChoiceFieldWidth = currFont.getAdvance(choices[i]);
}
m_ChoiceFieldWidth += m_TextMarginLeft + m_TextMarginRight + m_DropDownArrowWidth;
}
/**
* * Constructor. The width of choice box became as big as * maximum length of choice strings + text marfins + derop-down arrow width. * * @param String - label of the field * @param String[] - field choices * @param int - initial choice index * @param long - field style(see
* ObjectChoiceField styles)
*/
public CMyChoiceField(String label, String[] choices, int initialIndex, long style)
{
super(label, choices, initialIndex, style);
m_Choices = choices; // dimensions of selectable field
Font currFont = getFont();
m_DropDownArrowWidth = m_Height = currFont.getHeight();
m_ChoiceFieldWidth = currFont.getAdvance(choices[0]);
for (int i = 1; i < choices.length; i++)
{
if (m_ChoiceFieldWidth < currFont.getAdvance(choices[i]))
m_ChoiceFieldWidth = currFont.getAdvance(choices[i]);
}
m_ChoiceFieldWidth += m_TextMarginLeft + m_TextMarginRight + m_DropDownArrowWidth;
}
/** * Set field choices * * @param String[] - array of field choices */
public void setChoices(Object[] choices)
{
super.setChoices(choices);
m_Choices = (String[]) choices;
}
/** * Set field margins. This method takes an effect for * parameter to be >= 0. * * @param int - left margin of the field * @param int - right margin of the field * @param int - top margin of the field * @param int - bottom margin of the field */
public void setMargins(int marginLeft, int marginRight, int marginTop, int marginBottom)
{
if (marginLeft >= 0)
this.m_MarginLeft = marginLeft;
if (marginRight >= 0)
this.m_MarginRight = marginRight;
if (marginTop >= 0)
this.m_MarginTop = marginTop;
if (marginBottom >= 0)
this.m_MarginBottom = marginBottom;
}
/** * Set horizontal text alignment in the text box. * * @param int - alignment of the text */
public void setTextHAlignment(int alignment)
{
m_HTextAlignment = alignment;
}
/** * Set choice box width. * * @param int - choice box width. */
public void setChoiceWidth(int width)
{
m_ChoiceFieldWidth = width;
}
/** * Set text font. * * @param int - font style (see Font class) * @param int - font height * @param boolean - if true control height updates according to the new font height. */
public void setTextFont(int style, int height, boolean updateHeight)
{
this.setFont(getFont().derive(style, height));
if (updateHeight)
m_DropDownArrowWidth = m_Height = getFont().getHeight();
}
/** * Method retrieves this field's preferred width. * * @return int - field's preferred width */
public int getPreferredWidth()
{
return m_MarginLeft + m_MarginRight + m_ChoiceFieldWidth + getFont().getAdvance(getLabel());
}
/** * Method retrieves this field's preferred height. * * @return int - field's preferred height */
public int getPreferredHeight()
{
return m_MarginTop + m_MarginBottom + m_Height;
}
/** * Determines if this field accepts the focus. * * @return boolean - always true. */
public boolean isFocusable()
{
return true;
}
/** * Retrieves this field's current focus region. * * @param XYRect - object to contain the focus rect for this field in local coordinates */
public void getFocusRect(XYRect rect)
{
rect.set(m_MarginLeft + getFont().getAdvance(getLabel()), m_MarginTop, m_ChoiceFieldWidth, m_Height);
}
/** * Draws the focus indicator for this field * * @param Graphics - graphics context for drawing the focus * @param boolean - true if the focus should be set; otherwise, false. */
protected void drawFocus(Graphics graphics, boolean on)
{
invalidate();
}
/** * Lays out field contents. * * @param int - amount of available horizontal space. * @param int - amount of available vertical space. */
protected void layout(int width, int height)
{
setExtent(Math.min(getPreferredWidth(), width), Math.min(getPreferredHeight(), height));
}
/** * Invoked when a field receives the focus. * * @param int - Indicates from which direction the focus enters the field. */
public void onFocus(int direction)
{
m_isFocused = true;
invalidate();
}
/** * Invoked when a field loses the focus. */
public void onUnfocus()
{
m_isFocused = false;
invalidate();
}
/** * Method draws a edit field. * * @param Graphics - graphic context. */
public void paint(Graphics g)
{ // needed variables
String visibleText = (getSelectedIndex() == -1 || getSelectedIndex() >= m_Choices.length) ? "" : m_Choices[getSelectedIndex()];
int textLength = getFont().getAdvance(visibleText);
int labelLength = getFont().getAdvance(getLabel());
int textY = m_MarginTop + (m_Height - getFont().getHeight()) / 2;
if (textY < 0)
textY = m_MarginTop; // Text can be as big as text box field
while (textLength > m_ChoiceFieldWidth - m_TextMarginLeft - m_TextMarginRight - m_DropDownArrowWidth && visibleText.length() > 0)
{
visibleText = visibleText.substring(0, visibleText.length() - 1);
textLength = getFont().getAdvance(visibleText);
}
int textX = (m_HTextAlignment == TEXT_HALINGMENT_CENTER) ? m_MarginLeft + labelLength + m_TextMarginLeft + (m_ChoiceFieldWidth - m_TextMarginLeft - m_TextMarginRight - m_DropDownArrowWidth - textLength) / 2 : m_MarginLeft + labelLength + m_TextMarginLeft;
if (textX < 0)
textX = m_MarginLeft + labelLength + m_TextMarginLeft; // draw a lable
g.setColor(0);
g.drawText(getLabel(), m_MarginLeft, textY);
if (m_isFocused == false)
{ // Draw edit box b
g.setColor(m_DefBgColor);
g.fillRect(m_MarginLeft + labelLength, m_MarginTop, m_ChoiceFieldWidth, m_Height); // Draw edit box rect
g.setColor(0);
g.drawRect(m_MarginLeft + labelLength, m_MarginTop, m_ChoiceFieldWidth, m_Height); // Draw edit box text
g.setColor(m_DefTextColor);
g.drawText(visibleText, textX, textY); // g.drawText(Integer.toString(cursorPosition), m_MarginLeft + labelLength + m_TextMarginLeft, textY);
}
else
{ // Draw edit box bg
g.setColor(m_FocusedBgColor);
g.fillRect(m_MarginLeft + labelLength, m_MarginTop, m_ChoiceFieldWidth, m_Height); // Draw edit box rect
g.setColor(0);
g.drawRect(m_MarginLeft + labelLength, m_MarginTop, m_ChoiceFieldWidth, m_Height); // Draw edit box text
g.setColor(m_FocusedTextColor);
g.drawText(visibleText, textX, textY);
} // draw DropDown arrow
int ddaLeft = m_MarginLeft + labelLength + m_ChoiceFieldWidth - m_DropDownArrowWidth; // fill arrow
g.setColor(0xc6d4e9);
g.fillRect(ddaLeft, m_MarginTop, m_DropDownArrowWidth, m_Height / 2);
int leftPoint = ddaLeft, rightPoint = ddaLeft + m_DropDownArrowWidth - 1, height = m_MarginTop + m_Height / 2;
int bottom = m_MarginTop + m_Height - 1;
for (; height < bottom; height++, leftPoint++, rightPoint--)
g.drawLine(leftPoint, height, rightPoint, height); // outer line
g.setColor(0);
g.drawLine(ddaLeft, m_MarginTop, ddaLeft + m_DropDownArrowWidth - 1, m_MarginTop);
g.drawLine(ddaLeft + m_DropDownArrowWidth - 1, m_MarginTop, ddaLeft + m_DropDownArrowWidth - 1, m_MarginTop + m_Height / 2);
g.drawLine(ddaLeft + m_DropDownArrowWidth - 1, m_MarginTop + m_Height / 2, ddaLeft + m_DropDownArrowWidth / 2, m_MarginTop + m_Height - 1);
g.drawLine(ddaLeft + m_DropDownArrowWidth / 2, m_MarginTop + m_Height - 1, ddaLeft, m_MarginTop + m_Height / 2);
g.drawLine(ddaLeft, m_MarginTop + m_Height / 2, ddaLeft, m_MarginTop); // inner line
g.drawLine(ddaLeft + 1, m_MarginTop + 1, ddaLeft + m_DropDownArrowWidth - 2, m_MarginTop + 1);
g.drawLine(ddaLeft + m_DropDownArrowWidth - 2, m_MarginTop + 1, ddaLeft + m_DropDownArrowWidth - 2, m_MarginTop + m_Height / 2);
g.drawLine(ddaLeft + m_DropDownArrowWidth - 2, m_MarginTop + m_Height / 2, ddaLeft + m_DropDownArrowWidth / 2, m_MarginTop + m_Height - 2);
g.drawLine(ddaLeft + m_DropDownArrowWidth / 2, m_MarginTop + m_Height - 2, ddaLeft + 1, m_MarginTop + m_Height / 2);
g.drawLine(ddaLeft + 1, m_MarginTop + m_Height / 2, ddaLeft + 1, m_MarginTop + 1);
};
}
