Focus with GridFieldManager problem

I'm having a problem of development/unfocus. A label should draw a border of red around him when it gets the focus and a black border when he loses it. But when I add/remove a label for a GridFieldManager (see below the code and the screenshot), I find that the update will temporarily to the field at (0,0) and 'loses' never the focus - in other words, he draws a red border, but never black. So, I end up having 2 fields with the red border - something that should never happen!

I'm under 5.0 SDK on Eclipse. I reproduced the problem in the simplest possible form: If you import the following code, you'll see for yourself. Please help me!

Import net.rim.device.api.ui.XYEdges;
Import net.rim.device.api.ui.component.LabelField;
Import net.rim.device.api.ui.container.GridFieldManager;
Import net.rim.device.api.ui.container.MainScreen;
Import net.rim.device.api.ui.decor.Border;
Import net.rim.device.api.ui.decor.BorderFactory;

/ public final class screen extends MyScreen
{
private GridFieldManager MDT;

public MyScreen()
{
Set the displayed title of the screen
setTitle ("MyTitle");
int size = 3;
GFM = new GridFieldManager (size, size, GridFieldManager.FIELD_HCENTER |) GridFieldManager.FOCUSABLE);
for (int y = 0; y)< size;="" y++)="">
for (int x = 0; x)< size;="" x++)="">
LabelField nf = new LabelField ("H", LabelField.FOCUSABLE) {}
protected boolean navigationClick (int time, int status) {}
swap (this);
this.setFocus ();
Returns true;
}

Protected Sub onFocus (int direction) {}
this.setBorder (BorderFactory.createSimpleBorder (new XYEdges (1,1,1,1), new XYEdges(0xFF0000,0xFF0000,0xFF0000,0xFF0000), Border.STYLE_DASHED));
}

protected void onUnfocus () {}
this.setBorder (BorderFactory.createSimpleBorder (XYEdges (1,1,1,1))) of new;
}

};
nf.setBorder (BorderFactory.createSimpleBorder (XYEdges (1,1,1,1))) of new;

GFM. Add (NF);
}
}
Add (GFM);
}

private void swap (LabelField lf) {}
GFM. Delete (LF);
GFM. Add (LF);
}
}

Thus, even if I clicked on the intermediate element, an area of development is established around the item to (0,0)

Why is this?

Sorry to get to this post, this late - I could have saved a lot of traffic if I noticed it earlier...

In any case - onUnfocus has a very strange behavior. In some cases (I don't know which) it is not called at all when the field loses focus. So, rather than using onFocus/onUnfocus pair, use FocusChangeListener. This listener will turn on the eventType and onFocus on FOCUS_GAINED work and the work of onUnfocus on FOCUS_LOST.

Overall, it will look like this:

import net.rim.device.api.ui.XYEdges;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.container.GridFieldManager;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.ui.decor.Border;
import net.rim.device.api.ui.decor.BorderFactory;

public final class MyScreen extends MainScreen
{
    private GridFieldManager gfm;

    public MyScreen()
    {
        // Set the displayed title of the screen
        setTitle("MyTitle");
        int size = 3;
        FocusChangeListener fcl = new FocusChangeListener() {
          public void focusChanged(Field field, int eventType) {
            switch (eventType) {
            case FOCUS_GAINED:
              field.setBorder(BorderFactory.createSimpleBorder(new XYEdges(1,1,1,1), new XYEdges(0xFF0000,0xFF0000,0xFF0000,0xFF0000), Border.STYLE_DASHED), false);
              break;
            case FOCUS_LOST:
              field.setBorder(BorderFactory.createSimpleBorder(new XYEdges(1,1,1,1)), false);
              break;
            case FOCUS_CHANGED:
              break;
            default:
              break;
            }
          }
        };
        gfm = new GridFieldManager(size,size,GridFieldManager.FIELD_HCENTER|GridFieldManager.FOCUSABLE);
        for (int y = 0; y < size; y++) {
            for (int x = 0; x < size; x++) {
                LabelField nf = new LabelField("H", LabelField.FOCUSABLE) {
                    protected boolean navigationClick(int time, int status) {
                        swap(this) ;
                        this.setFocus();
                        return true;
                    }

                };
                nf.setBorder(BorderFactory.createSimpleBorder(new XYEdges(1,1,1,1)));
                nf.setFocusListener(fcl);

                gfm.add(nf);
            }
        }
        add(gfm);
    }

    private void swap(LabelField lf){
        gfm.delete(lf);
        gfm.add(lf);
    }
}

You will notice that I have created a FocusChangeListener to listen each LabelField and changed calls setBorder on focus has changed not update in page layout (as does not change the size of the border), which will make it much more effective and does not cause the entire screen redraw

You can do even better if you setBorder on the ground as it is created, but use the long form - viewable one following first parameter. Define borders forVISUAL_STATE_FOCU andVISUAL_STATE_NORMA at least. Again, take a long look at prototypes withupdateLayou indicator. This way you won't have to worry about changes in development at all - the system will do it for you

Tags: BlackBerry Developers

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