Not able to set the focus on a HorizontalFieldManager - blackberry

Question

I am not able to set the focus on the HorizontalFieldManager having two LabelFields. I want to highlight the HorizontalFieldManager when it gets focus. I am using the following code, but it is not working.
HorizontalFieldManager hrzMgrTimeLabel = new HorizontalFieldManager(
Manager.USE_ALL_HEIGHT|Manager.FOCUSABLE) {
protected void onFocus(int direction) {
focussed = true;
invalidate();
super.onFocus(direction);
}
protected void onUnfocus() {
focussed = false;
invalidate();
super.onUnfocus();
}
protected void paint(Graphics g) {
g.setBackgroundColor(0x646060);
if (focussed) {
g.setColor(Color.BLUE);
}
g.clear();
super.paint(g);
}
};
hrzMgrTimeLabel.add(a);
hrzMgrTimeLabel.add(b);
horizontalFieldManager_left15.add(hrzMgrTimeLabel);
Here is the LabelField implementation.
final LabelField a= new LabelField("") {
protected void paint(Graphics graphics) {
graphics.setColor(Color.WHITE);
graphics.setBackgroundColor(0x646060);
graphics.clear();
super.paint(graphics);
}
};
final LabelField b= new LabelField("") {
protected void paint(Graphics graphics) {
graphics.setColor(Color.WHITE);
graphics.setBackgroundColor(0x646060);
graphics.clear();
super.paint(graphics);
}
};

Answer 1

The getFocusRect() function might give you the answer.
It gives the extent for which the focus is applied in Manager and then the Graphics.paint() method or Border class can be used.

Answer 2

You need to at least one focusable field on the HorizontalFieldManager. The following line will do that.
hrzMgrTimeLabel.add(new NullField(NullField.FOCUSABLE));
Check the following code.
HorizontalFieldManager hrzMgrTimeLabel = new HorizontalFieldManager(Manager.USE_ALL_HEIGHT | Manager.FOCUSABLE) {
protected void paint(Graphics g) {
g.setBackgroundColor(isFocus() ? Color.BLUE : 0x646060);
g.clear();
super.paint(g);
}
protected void onFocus(int direction) {
invalidate();
super.onFocus(direction);
}
protected void onUnfocus() {
invalidate();
super.onUnfocus();
}
protected boolean navigationMovement(int dx, int dy, int status, int time) {
invalidate();
return super.navigationMovement(dx, dy, status, time);
}
protected boolean navigationClick(int status, int time) {
invalidate();
return super.navigationClick(status, time);
}
protected boolean navigationUnclick(int status, int time) {
invalidate();
return super.navigationUnclick(status, time);
}
};
final LabelField a = new LabelField("First Label Field") {
protected void paint(Graphics graphics) {
graphics.setColor(Color.WHITE);
super.paint(graphics);
}
};
final LabelField b = new LabelField("Second Label Field") {
protected void paint(Graphics graphics) {
graphics.setColor(Color.WHITE);
super.paint(graphics);
}
};
hrzMgrTimeLabel.add(new NullField(NullField.FOCUSABLE));
hrzMgrTimeLabel.add(a);
hrzMgrTimeLabel.add(b);
Note
onFocus(...), onUnfocus(), navigationMovement(...), navigationClick(...), navigationUnclick(...) - these methods were just overrided for refreshing the drawing.

Answer 3

If you want to focus your label field then use final LabelField a= new LabelField("".FOCUSABLE).