setVerticalScroll does not not in 6.0.0 Simulator

My project is built using JRE 5.0.0 and everything works correctly when you test in a simulator running OS 5.0.0. The problem I have is that for a screen scroll does not work when testing on a simulator running OS 6.0.0.

I have a class derived from screen with a unique VerticalFieldManager added as follows:

summaryContent = new VerticalFieldManager(VerticalFieldManager.VERTICAL_SCROLL | VerticalFieldManager.VERTICAL_SCROLLBAR);
add(summaryContent);

Multiple instances of HorizontalFieldManager are then added to summaryContent. Each HorizontalFieldManager contains two fields (a LabelField and a RichTextField). I replaced for the LabelField getPreferredWidth method to return a constant value to ensure a fixed width. The RichTextField is created with the USE_ALL_WIDTH and NON_FOCUSABLE styles.

I have managers in place to capture the navigation, wheel and touch events and from that determine the amount of movement, the user has a up/down input. This amount is then passed to the next method:

protected void scrollContent(int amount)
{
    int verticalScroll = summaryContent.getVerticalScroll();
    int virtualHeight = summaryContent.getVirtualHeight();
    int visibleHeight = summaryContent.getVisibleHeight();
    int maxScroll = virtualHeight - visibleHeight;

    if (maxScroll < 0) maxScroll = 0;

    int fontHeight = getGraphics().getFont().getHeight();
    int requestedScroll = amount * fontHeight;

    if (requestedScroll < 0)
    {
        if (verticalScroll + requestedScroll < 0) requestedScroll = -verticalScroll;
    }
    else
    {
        if (verticalScroll + requestedScroll > maxScroll) requestedScroll = maxScroll - verticalScroll;
    }

    summaryContent.setVerticalScroll(verticalScroll + requestedScroll);
    summaryContent.invalidate();
}

Any value is passed to summaryContent.setVerticalScroll (), the verticalScrollPosition remains at 0. Yet once, this will only occur when you test in a Simulator runs 6.0.0 OS. I do not have a physical device with this OS, so I can't check if the problem is with the version of the OS or the Simulator. I tested on a device and in a simulator running OS 5.0.0 and it works perfectly.

Is this a bug or something I can make anyone see bad?

I finally get it working. The problem is off not to be in the code that I posted originally, but in the input event handlers. Originally, my navigationMovement event handler looks like this:

    protected boolean navigationMovement(int dx, int dy, int status, int time)
    {
        if (dy != 0) scrollContent(dy);
        return true;
    }

The fix was to add the following line at the beginning of the navigationMovement method:

       super.navigationMovement(dx, dy, status, time);

For some reason, the call to the base class method is required on OS 6.0 but not 5.0.

Tags: BlackBerry Developers

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