I ran into a similar problem...I needed a series of numeric edit fields that would display fixed width fonts, and no combination of built in fonts gave me what I wanted. There are some posts in the old forums that led me to this solution, but its basically to roll a custom field class. In my case, the edit fields contain a fixed number of digits, so it makes the math a little easier. This class also doesn't support decimals, but it shouldn't be too hard too adapt.
class FixedWidthNumericEditField
extends BasicEditField
{
private static final long STYLE = DrawStyle.VCENTER | DrawStyle.HCENTER | Field.FIELD_VCENTER | Field.FIELD_HCENTER | BasicEditField.FILTER_NUMERIC;
private final int digitWidth;
private final int fieldWidth;
public FixedWidthNumericEditField(final int length, final int fieldWidth, final Font font, final FieldChangeListener fieldChangeListener)
{
super("", "", length, STYLE);
digitWidth = fieldWidth / length;
this.fieldWidth = fieldWidth;
setChangeListener(fieldChangeListener);
setFont(font);
// This is needed because of our custom drawFocus logic. Without invalidating the control,
// there are areas of the screen that do not get redrawn as you move the cursor around
setFocusListener(new FocusChangeListener()
{
public void focusChanged(Field field, int eventType)
{
invalidate();
}
});
}
public int getPreferredWidth()
{
return fieldWidth;
}
public int getPreferredHeight()
{
return super.getPreferredHeight();
}
protected void layout(int width, int height)
{
width = getPreferredWidth();
height = getPreferredHeight();
super.layout(width, height);
super.setExtent(width, height);
}
protected void drawFocus(Graphics graphics, boolean on)
{
int pos = getCursorPosition();
int x = (pos * digitWidth) + (getFont().getAdvance(getLabel()));
int y = 1;
drawHighlightRegion(graphics, Field.HIGHLIGHT_FOCUS, on, x, y, digitWidth, getHeight());
}
protected void paint(Graphics graphics)
{
int x = 0;
int y = 0;
int digitCount = getTextLength();
Font f = getFont();
char c;
int charWidth;
int digitCenter;
int left;
for (int i = 0; i < digitCount; i++)
{
c = charAt(i);
charWidth = f.getAdvance(c);
digitCenter = x + (digitWidth / 2);
left = digitCenter - (charWidth / 2);
graphics.drawText(c, left, y, 0, digitWidth);
x += digitWidth;
}
int w = getWidth();
int h = getHeight();
graphics.setColor(0x00000000);
graphics.drawRect(0, 0, w, h);
}
}
