下面的类是一个文本框字段。可以对此进行修改,以便当文本框充满文本并且用户继续键入文本然后滚动时?现在发生的事情是,一旦文本框充满了文本,任何后续输入的文本都不会显示。
谢谢
import net.rim.device.api.ui.Color;
import net.rim.device.api.ui.Font;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.component.EditField;
public class CustomEditField extends EditField {
// private members of the CustomEditField class
private Font defaultFont;
// used to get the default font
private String text;
// used to specify the default width of the table cells
// constructor calls the super class constructor
public CustomEditField(String label, String initialValue, int maxNumChars,
long style) {
super(label, initialValue, maxNumChars, style);
}
// overrides the default getPreferredWidth functionality to return a fixed
// width
public int getPreferredWidth() {
defaultFont = Font.getDefault();
text = "0000000000";
return defaultFont.getAdvance(text);
}
// overrides the default layout functionality to set the width of the table
// cell
protected void layout(int width, int height) {
width = getPreferredWidth();
height = super.getPreferredHeight();
super.layout(width, height);
// uses the super class' layout functionality
// after the width and the height are set
super.setExtent(width, height);
// uses the super class' setExtent functionality
// after the width and the height are set
}
public void paint(Graphics graphics){
graphics.setBackgroundColor(Color.LIGHTBLUE);
super.paint(graphics);
}
}