黑莓滚动变化监听 [英] scroll change listener on blackberry

问题描述

当我执行以下code在模拟器上它抛出计算器错误。

我觉得，当我滚动每个newhorizo​​ntalScroll价值附带的错误。

如何避免它，或者如何计算最终水平滚动价值？

  INT customfiledwidth = Display.getWidth（）/ 3;
Horizo​​ntalFieldManager horizo​​ntalScrollLayout =新Horizo​​ntalFieldManager（Horizo​​ntalFieldManager.HORIZONTAL_SCROLL）
horizo​​ntalScrollLayout.setScrollListener（本）;//我在horizo​​ntalscrolllayout添加的CustomField数.....公共无效scrollChanged（经理经理，INT newHorizo​​ntalScroll，诠释newVerticalScroll）
{
    {        horizo​​ntalScrollLayout.setHorizo​​ntalScroll（newHorizo​​ntalScroll）;
        INT字段索引= horizo​​ntalScrollLayout.getFieldAtLocation（newHorizo​​ntalScroll + customfieldwidth，0）;
        域F = horizo​​ntalScrollLayout.getField（字段索引）;
        f.setFocus（）;
        无效（）;
        }}
    }
 

解决方案

您正在进入一个无限循环pretty通过调用多少 setHorizo​​ntalScroll（）的同场，你是听其滚动。我会删除此行，看看你的code ++工程。

When I execute the following code on a simulator it throws stackoverflow error.

I think the error came for, Each newhorizontalScroll value when I scroll.

How to avoid it or how to calculate the final horizontal scroll value?

int customfiledwidth = Display.getWidth()/3;


HorizontalFieldManager horizontalScrollLayout = new HorizontalFieldManager(HorizontalFieldManager.HORIZONTAL_SCROLL)
horizontalScrollLayout.setScrollListener(this);

// i add number of customfield on horizontalscrolllayout.....

public void scrollChanged(Manager manager, int newHorizontalScroll,int newVerticalScroll) 
{
    {

        horizontalScrollLayout.setHorizontalScroll(newHorizontalScroll);
        int fieldIndex =horizontalScrollLayout.getFieldAtLocation(newHorizontalScroll+customfieldwidth,0);
        Field f = horizontalScrollLayout.getField(fieldIndex);
        f.setFocus();
        invalidate();
        }}
    }

解决方案

You're getting into an infinite loop pretty much by calling setHorizontalScroll() on the same Field that you are listening to its scroll. I would remove this line and see if your code works.

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