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Java Development

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New Contributor
Posts: 2
Registered: ‎06-17-2012
My Device: 9550
My Carrier: Airtel

Background image causes scrolling

Hi All,

 

I have added a background image to VerticalFieldManager . 

 

VerticalFieldManager verticalFieldManager = new VerticalFieldManager(

VerticalFieldManager.USE_ALL_WIDTH
| VerticalFieldManager.USE_ALL_HEIGHT) {

 

// Override the paint method to draw the background image.
public void paint(Graphics graphics) {
// Draw the background image and then call paint.
graphics.drawBitmap(0, 0, getWidth(), getHeight(), image, 0, 0);
super.paint(graphics);
}

};

 

Now when I add this manager to my screen then it causes the scroll arrows to come on right top and bottom of screen although the image perfectly fits the dislayable area. When I scroll down it simply scrolls down indefinately and shows a white screen (the background image which I using has Blue color).

 

If I remove VerticalFieldManager.USE_ALL_HEIGHT , then the image does not show unless I add some componenets in this field manager.

 

Not sure whats going on.

 

Thanks !

Developer
Posts: 19,636
Registered: ‎07-14-2008
My Device: Not Specified

Re: Background image causes scrolling

I think you need to add NO_VERTICAL_SCROLL.

 

But I think this is all expained in this KB article, which I suggest you review. 

http://supportforums.blackberry.com/t5/Java-Development/MainScreen-explained/ta-p/606644

New Contributor
Posts: 2
Registered: ‎06-17-2012
My Device: 9550
My Carrier: Airtel

Re: Background image causes scrolling

Thanks it worked but now when the keyboard is up I cannot see fields which are below the keyboard.

 

How do I overcome this ?

 

Thanks and Regards.

Developer
Posts: 2,268
Registered: ‎07-08-2009
My Device: various
My Carrier: various

Re: Background image causes scrolling

I suggest you try creating MainScreen with NO_VERTICAL_SCROLL and your VerticalFieldManager displaying the background with USE_ALL_HEIGHT and VERTICAL_SCROLL. See if that helps.

 

In fact, that is pretty much what was suggested in the article Peter quoted, though I never fully spelled it out there. I don't guarantee it will work as you want it to - the way virtual keyboard works is a puzzle at times Smiley Happy

 

Good luck!

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