Question

我有一个LabelField whith样式FOCUSABLE和许多可关注的Field s之后，我覆盖了navigationMovement的LabelField方法。navigationMovement的新实现，但焦点通常从LabelField移到下一个Field而不经过{{3}实施！

PS，我还使用调试器测试，以确保它永远不会进入其实现。

为什么会发生这种情况以及如何捕获FOCUSABLE LabelField的navigationMovement事件？

CODE：
这是班级：

public abstract class FocusableLabelField extends LabelField {
public boolean isDownUnfocused = false;

public FocusableLabelField(String text) {
    super(text, FOCUSABLE);
}

protected void drawFocus(Graphics graphics, boolean on) {
        // DO NOTHING, FOCUS IS HANDLED IN PAINT
}

protected void paint(Graphics graphics) {
    if(isDownUnfocused == true)
        graphics.setColor(0xFFFFFF);
    else {
        if(isFocus())
            graphics.setColor(0xFFFFFF);
        else {
            graphics.setColor(0x777777);
        }
    }
    super.paint(graphics);
}

protected void onFocus(int direction) {
    isDownUnfocused = false;
    onFocusing();
    super.onFocus(direction);
}

public abstract void onFocusing();

public void redraw() {
    invalidate();
}

protected boolean navigationMovement(int dx, int dy, int status, int time) {
    //TODO CHECK WHY IT'S NOT ENTERING HERE !
    if(dy>0)
        isDownUnfocused = true;
    invalidate(); // IF REMOVED NO EFFECT WILL BE APPLIED
    return super.navigationMovement(dx, dy, status, time);
}
}

以下是我在屏幕中使用它的方式：

FocusableLabelField field = new FocusableLabelField("title") {
    public void onFocusing() {
        // some logic in the screen is done here ...
    }
} ;

Answer 1

我刚刚在5.0 8900模拟器和7.1 9900模拟器上的应用程序中运行了完全代码，而我确实看到您调用的navigationMovement()。但是，我并不是100％确定它是在你想要的时候被调用的。

我不确切知道你要做什么，但看看上面的代码，看起来你只是想为焦点颜色添加自定义绘图。是吗？

如果是这样，我甚至不知道为什么你甚至需要覆盖navigationMovement()。为什么不使用这样的代码：

public abstract class FocusableLabelField extends LabelField {

   public FocusableLabelField(String text) {
      super(text, FOCUSABLE);
   }

   protected void drawFocus(Graphics graphics, boolean on) {
      // DO NOTHING, FOCUS IS HANDLED IN PAINT
   }

   protected void paint(Graphics graphics) {  
      int oldColor = graphics.getColor();
      if(isFocus())
         graphics.setColor(0xFFFFFF);
      else {
         graphics.setColor(0x777777);
      }
      super.paint(graphics);
      graphics.setColor(oldColor);
   }

   protected void onFocus(int direction) {
      onFocusing();
      invalidate();
      super.onFocus(direction);
   }

   protected void onUnfocus() {
      invalidate();
      super.onUnfocus();
   }

   public abstract void onFocusing();
}

为什么Blackberry会绕过FOCUSABLE Label Field的导航运动？

1 个答案: