无法在HorizontalFieldManager上设置焦点

Question

我无法将焦点放在拥有两个LabelFields的HorizontalFieldManager上。当HorizontalFieldManager获得焦点时，我想突出显示它。我正在使用以下代码，但它不起作用。

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);

下面是LabelField的实现。

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

getFocusRect()函数可能会给出答案。它给出了在管理器中应用焦点的范围，然后可以使用Graphics.paint()方法或Border类。

Answer 2

如果您想要聚焦您的标签字段，那么使用final LabelField a= new LabelField("".FOCUSABLE)。

Answer 3

您需要在HorizontalFieldManager上至少有一个可聚焦字段。下面这行代码可以做到这一点。

hrzMgrTimeLabel.add(new NullField(NullField.FOCUSABLE));

检查以下代码。

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);

便笺

onFocus(...)、onUnfocus()、navigationMovement(...)、navigationClick(...)、navigationUnclick(...) -这些方法只是为了刷新绘图而被覆盖。