Ask yourself: where is that border painted? If you look carefully, you'll find this:
public void paint(Graphics g) {
super.paint(g);
g.drawRect(0, 0, getWidth(), getHeight());
}
That g.drawRect paints the border. How do you change its color, you ask? You use Graphics.setColor() for that. So, you change that to:
public void paint(Graphics g) {
super.paint(g);
int prevColor = g.getColor();
g.setColor(myBorderColor);
g.drawRect(0, 0, getWidth(), getHeight());
g.setColor(prevColor);
}
(please observe that saving of the previous color and restoring it after you've done using your custom one).
That myBorderColor should be a member variable in your TextBoxField, which you change in your onFocus() and your onUnfocus() calls. If you do it there, don't forget to invalidate() your whole TextBoxField after changing that color.
Now, if you use that TextBoxField, be advised that it is an example of some extremely careless programming - and I don't use those words lightly. The culprit is this piece of code:
editField = new EditField(){
public void paint(Graphics g) {
getManager().invalidate();
super.paint(g);
}
};
The highlighted line causes the manager to repaint its fields, which, in turn, calls the same paint() again - and again, and again, creating a kind of a soft infinite loop on event (UI) thread. Since the rationale behind that invalidation is to preserve the border during vfm's scrolling, the right approach would be to catch that scrolling event and invalidate the manager there. Use ScrollChangeListener for that. Something like this:
VerticalFieldManager vfm =
new VerticalFieldManager
(Manager.VERTICAL_SCROLL);
vfm.setScrollListener(new ScrollChangeListener() {
void scrollChanged(Manager mgr, int horizontal, int vertical) {
mgr.getManager().invalidate();
}
});
I doubt you need to go through all that trouble as the border has nothing to do with the inner Manager scrolling, though one needs to test that.
Also notice that the original code would not refresh that border anyway, as the Manager of the editField is vfm, not the whole TextBoxField! And invalidating vfm is not enough to make its parent Manager to repaint the border.
Edit: Just debugged and had success with this:
public class TextBoxField extends VerticalFieldManager {
int myWidth;
int myHeight;
VerticalFieldManager vfm = new VerticalFieldManager(VERTICAL_SCROLL | VERTICAL_SCROLLBAR | USE_ALL_WIDTH | USE_ALL_HEIGHT);
EditField editField = new EditField("", "", EditField.DEFAULT_MAXCHARS, FOCUSABLE);
TextBoxField(int width, int height) {
super(NO_VERTICAL_SCROLL);
myWidth = width;
myHeight = height;
add(vfm);
vfm.add(editField);
}
public String getText() {
return editField.getText();
}
protected void sublayout(int w, int h) {
int actWidth = Math.min(myWidth, w);
int actHeight = Math.min(myHeight, h);
super.sublayout(actWidth - 2, actHeight - 2); // Leave room for border
setPositionChild(vfm, 1, 1); // again, careful not to overlay the border
setExtent(actWidth, actHeight);
}
protected void paint(Graphics g) {
super.paint(g);
int prevColor = g.getColor();
g.setColor(Color.BLACK);
g.drawRect(0, 0, getWidth(), getHeight());
g.setColor(prevColor);
}
}
Again, change g.setColor() the way you see fit.
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