Blackberry JAVA DEVELOPMENT ENVIRONMENT - - CRYPTOGRAPHIC SMART CARD DRIVER - DEVELOPMENT GUIDE Guida alla Risoluzione dei Problemi Scaricare il pdf (Pagina 18)

BlackBerry Java Development Environment Development Guide

Create a custom field

Task Steps

Create a custom field. You can only add custom context menu items and custom layouts to a custom field.

> Extend the Field class, or one of its subclasses, implementing the DrawStyle interface to specify the

characteristics of the custom field and turn on drawing styles.

public class CustomButtonField extends Field implements DrawStyle {

public static final int RECTANGLE = 1;

public static final int TRIANGLE = 2;

public static final int OCTAGON = 3;

private String _label;

private int _shape;

private Font _font;

private int _labelHeight;

private int _labelWidth;

}

Define the label, shape,

and style of the custom

button.

> Implement constructors to define the label, shape, and style of the custom button.

public CustomButtonField(String label) {

this(label, RECTANGLE, 0);

}

public CustomButtonField(String label, int shape) {

this(label, shape, 0);

}

public CustomButtonField(String label, long style) {

this(label, RECTANGLE, style);

}

public CustomButtonField(String label, int shape, long style) {

super(style);

_label = label;

_shape = shape;

_font = getFont();

_labelHeight = _font.getHeight();

_labelWidth = font.getWidth();

}

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Blackberry JAVA DEVELOPMENT ENVIRONMENT - - CRYPTOGRAPHIC SMART CARD DRIVER - DEVELOPMENT GUIDE Guida alla Risoluzione dei Problemi Pagina 18