BitmapFields CENTER alignment

Hi all

Please help me more.

I have created several BitmapFields and put them in HorizontalFieldManager.

But these BitmapFields are always left aligned.

I want to be focused on these fields.

How can I do this?

Examples?

Thank you

DK.

Like so many other things, the page layout settings are not terribly clear when it comes to user interface components.  First, imagine that a HFM might be assuming that it has * not * forced by the size of the screen; they are often provided a value of 1 million (or something) for their scope max then they are folding.  Anyway, I don't want to start all the user interface controls...

What I did (I only do things once and then I reuse my stuff), is to create my own handler by extending HFM.  I did it for a toolbar item that looks a lot like what you're doing.

public Toolbar() {
    super(NO_HORIZONTAL_SCROLL | NO_VERTICAL_SCROLL);

    // more init stuff...
}

You'll want to disable scrolling as the HFM will make your life difficult if not; make your own scroll if you have more components than is adapted to the screen.

Then use sublayout to provision only your children (buttons) and define your measure:

    protected void sublayout(int width, int height) {
        int fieldCount = getFieldCount();

        for (int i = 0; i < fieldCount; i++) {
            Field field = getField(i);
            layoutChild(field, width, height);
            maxFieldHeight = Math.max(maxFieldHeight, field.getHeight());
        }

        int extentHeight = maxFieldHeight + VERTICAL_PADDING * 2;

        setExtent(width, extentHeight); 

        layoutButtonSpacing();
    }

"layoutButtonSpacing" simply determines how many buttons is adapted to the screen and, on that basis, determines the amount of spacing that should go between them.  It stores this value in an instance variable.

Then, you need to replace 'subpaint' actually paint your components and your buttons.  A mine simplfied version follows (paint removed background and code associate of scrolling):

protected void subpaint(Graphics graphics) {
                  int xOffset = buttonSpacing;

        for (int i = 0; i < fieldCount; i++) {
            Field field = getField(i);

            setPositionChild(field, xOffset, 0);
            paintChild(graphics, field);

            xOffset += field.getWidth() + buttonSpacing;
        }
}

In addition, there may be of other bits and pieces of scaffolding, you'll want to implement if you want certain behavior (for example, setting the focus to the button on the last if the user navigates in the component).

Well, HTH.

Tags: BlackBerry Developers

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