Horizontal Scrolling in AbsoluteFieldManager

Hello

I am trying to add several labels to an AbsoluteFieldManager as follows:

        final AbsoluteFieldManager man = new AbsoluteFieldManager();

        man.add(new LabelField("1", Field.FOCUSABLE), 20, 0);
        man.add(new LabelField("2", Field.FOCUSABLE), 30, 100);
        man.add(new LabelField("3", Field.FOCUSABLE), 0, 200);
        man.add(new LabelField("4", Field.FOCUSABLE), 0, 220);
        man.add(new LabelField("5", Field.FOCUSABLE), 150, 240);
        man.add(new LabelField("6", Field.FOCUSABLE), 300, 260);
        man.add(new LabelField("7", Field.FOCUSABLE), 300, 280);
        man.add(new LabelField("8", Field.FOCUSABLE), 300, 300);
        man.add(new LabelField("9", Field.FOCUSABLE), 300, 320);
        man.add(new LabelField("10", Field.FOCUSABLE), 350, 320);
        man.add(new LabelField("11", Field.FOCUSABLE), 400, 320);
        man.add(new LabelField("12", Field.FOCUSABLE), 450, 320);
        man.add(new LabelField("13", Field.FOCUSABLE), 500, 320);
        man.add(new LabelField("14", Field.FOCUSABLE), 550, 320);
        man.add(new LabelField("15", Field.FOCUSABLE), 600, 320);
        this.add(man);

When I move on the trackpad, the next label Gets the focus. This works well in the direction y. All labels with Label '12' are visible. When I try to get the focus to the next label, '12' Label loses focus. '13' label now has the development in-house, but it is not visible and no scrolling happens. Ditto for the "14" and "15". It is easy to notice, the focus moves to the 14 and 15, because it takes a lot of movement on the trackpad to return to 12. But why the AbsoluteFieldManager scrolls at 13, 14 and 15 to make them visible?

I also tried to add the AbsoluteFieldManager to a HorizontalScreenManager that has vertical and horizontal scrolling. Then, it is even possible to scroll, but not yet all of the labels are visible.

Is that what I can do to make it possible that the AbsoluteFieldManager scrolls auotmatically once a field outside of the visible area Gets the focus?

Thank you

Hello

Finally, I made my own AbsoluteFieldManager. It works really well. You can position your fields anywhere and just highlight the field you want. I also substitute nextFocus() which now moves according to the movement of pad/trackball. I think it is fairly intuitive and not according to the order of the fields. You can also use it on Blackberry OS prior to 5, where AbsoluteFieldManager is not supported.

This thread helped me a lot:

http://supportforums.BlackBerry.com/T5/Java-development/AbsoluteFieldManager-on-OS-prior-to-5-0/TD-p...

Here is the code, feel free to use or improve.

import java.util.Vector;

import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Manager;
import net.rim.device.api.ui.XYPoint;

public class ImageMenuFieldManager extends Manager
{

    protected Vector _coordinates;

    public ImageMenuFieldManager()
    {
        super(Manager.VERTICAL_SCROLL | Manager.HORIZONTAL_SCROLL);
        _coordinates = new Vector();

    }

       public int getPreferredWidth()
      {
            return Integer.MAX_VALUE >> 1;
       }

       public int getPreferredHeight()
        {
           return Integer.MAX_VALUE >> 1;
       }

    protected void sublayout(final int maxWidth, final int maxHeight)
    {
        int totalWidth = 0;
        int totalHeight = 0;
        final int noOfFields = getFieldCount();
        final int maxSize = Integer.MAX_VALUE >> 1;

        for (int i = 0; i < noOfFields; ++i)
        {
            final XYPoint fieldPos = (XYPoint) _coordinates.elementAt(i);
            final Field field = getField(i);
            layoutChild(field, maxSize - fieldPos.x, maxSize - fieldPos.y);
            setPositionChild(field, fieldPos.x, fieldPos.y);
            totalWidth = Math.max(totalWidth, field.getExtent().X2());
            totalHeight = Math.max(totalHeight, field.getExtent().Y2());
        }
        setExtent(Math.min(maxWidth, totalWidth), Math.min(maxHeight, totalHeight));
        setVirtualExtent(totalWidth, totalHeight);
    }

    protected int nextFocus(final int direction, final int axis)
    {

        final int focusFieldIndex = this.getFieldWithFocusIndex();

        final int size = _coordinates.size();
        final XYPoint position = (XYPoint) _coordinates.elementAt(focusFieldIndex);
        int shortestAbsoluteDistance = 0;
        int nearestIndex = focusFieldIndex;
        for (int i = 0; i < size; i++)
        {
            //skip focus field
            if (i != focusFieldIndex)
            {

                final XYPoint p = (XYPoint) _coordinates.elementAt(i);
                final int xDistance = p.x - position.x;
                final int yDistance = p.y - position.y;
                final int absoluteDistance = (xDistance * xDistance) + (yDistance * yDistance);

                //point p is in direction right
                if (direction > 0 && xDistance > 0 && axis == Manager.AXIS_HORIZONTAL)
                {
                    if (absoluteDistance < shortestAbsoluteDistance || shortestAbsoluteDistance == 0)
                    {
                        shortestAbsoluteDistance = absoluteDistance;
                        nearestIndex = i;
                    }
                }
                //point p is in direction left
                if (direction < 0 && xDistance < 0 && axis == Manager.AXIS_HORIZONTAL)
                {
                    if (absoluteDistance < shortestAbsoluteDistance || shortestAbsoluteDistance == 0)
                    {
                        shortestAbsoluteDistance = absoluteDistance;
                        nearestIndex = i;
                    }
                }

                //point p is in direction down
                if (direction > 0 && yDistance > 0 && axis == Manager.AXIS_VERTICAL)
                {
                    if (absoluteDistance < shortestAbsoluteDistance || shortestAbsoluteDistance == 0)
                    {
                        shortestAbsoluteDistance = absoluteDistance;
                        nearestIndex = i;
                    }
                }

                //point p is in direction up
                if (direction < 0 && yDistance < 0 && axis == Manager.AXIS_VERTICAL)
                {
                    if (absoluteDistance < shortestAbsoluteDistance || shortestAbsoluteDistance == 0)
                    {
                        shortestAbsoluteDistance = absoluteDistance;
                        nearestIndex = i;
                    }
                }

            }
        }

        return nearestIndex;

    }

    public void add(final Field field)
    {
        throw new IllegalArgumentException("You need to provide x and y coordinates to add a field. Use add (Field field, int x, int y) instead");
    }

    public void add(final Field field, final int x, final int y)
    {
        super.add(field);
        this._coordinates.addElement(new XYPoint(x, y));
        updateLayout();
    }

}

Tags: BlackBerry Developers

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