verticalfieldmanager will not be available to the child

private VerticalFieldManager vfm = new VerticalFieldManager( Manager.VERTICAL_SCROLL | Manager.VERTICAL_SCROLLBAR | Manager.FIELD_HCENTER) {

        int width = Display.getWidth();
        int height = Display.getHeight() - 80;

        public void sublayout(int maxWidth, int maxHeight) {
            super.sublayout( width, height);
            int bagi = (Display.getWidth() - this.getField(0).getWidth()) / 2;
            Field field = this.getField(0);
            setPositionChild(field, bagi, 0);
            setExtent( width, height);
        }
    };

I had a display issue of the provision of the child for verticalfieldmanager.

available to the child focuses not horizontal on the Manager when creating a fixed size for the Manager.

someone knows the solution?

setpositionchild will not solve the problem.

This code, I think he need to better understand what a Manager should do in the sublayout and the constraints that it works under.

Let's look at your code:

' public void sublayout (int maxWidth, maxHeight int) {}
Super.sublayout (width, height);
bagi int = (Display.getWidth () - this.getField (0) .getWidth ()) / 2;
Field = this.getField (0);
setPositionChild (field, bagi, 0);
setExtent (width, height);
}

There are a lot of points to note, please bear with me:

You specify your Manager with Manager.FIELD_HCENTER.  It's trying to tell the Manager you add this in (call it the father Manager), that this child, the Manager must be centered horizontally.  So the father will help this child Manager, then determine how wide the child Manager, then to determine the width of the father is the Director and finally position the child in the Center Manager.  Here, the assumption is that this Manager will have limited space on each side.  If she has in fact that, will depend on the type of Manager, and other fields in it, and how have specified you them.  But this setting in itself might solve your problem.  The fact that it is not suggests there is another problem elsewhere.

Note that the space provided for the Manager is the maximum that he can use.  As you try to limit the width and the height, in case you, the area you have to play with is bounded by

(1) a minimum of maxWidth and Display.getWidth () - 80, width and

(2) minimum of maxHeight and Display.getHeight)

You should check this before using a value for your treatment.

You call super.layout (), then actually ignore everything he does, except that it will be layout all fields, this value must be precise:

this.getField (0) .getWidth)

But what we don't know is how you asked that area be set up.  For example, they say this field of USE_ALL_WIDTH.  In this case the value of bagi was 0 and means that this Manager cannot hope 'centre' field.

I recommend that you consult these KB articles for more information on how to program manager.

http://supportforums.BlackBerry.com/T5/Java-development/create-a-custom-layout-manager-for-a-screen/...

http://supportforums.BlackBerry.com/T5/Java-development/how-to-extend-Manager/Ta-p/446749

In this particular case, you can actually Center a field in a fair value for money using the FIELD_HCENTER style.  If it does not, then it is probably a problem with the field as an EditField who always takes the entire width.  You will not solve this using your own.

In addition, in this case, we can actually solve this problem for you.  You can debug this further and determine exactly why the field is not being centered.  Is it because bagi is 0 for example?  I hope that knowing that you will have to review the articles once again will help to debug this.

Tags: BlackBerry Developers

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