Blackberry - How to do text wrapping in ListField with Checkboxes?

Question

Hi all,

I m creating a ListField with Checkboxes from How To - Create a ListField with check boxes
But I m not getting how to wrap Text in a row in that ListField.
I referred the thread Text Wrapping for text in List Field items

Here its written as

If all you are displaying is text, then I would go with the approach suggested by rab.

I m displaying Text only in ListField which I want to wrap if it doesnt fit within device screen.
But i m not getting "approach suggested by rab" in which How to calculate?

String [] linesToDraw = calculate the number of lines depending on the row width

I m stucked at this so any details on this issue ?

Answer 1

I think "calculate the number of lines depending on the row width" means:

• split text on words
• create string array and while words array not empty do
  • create string lineStr
  • while getFont().getAdvance(lineStr+" "+words[i]) < row width move words[i] to lineStr

in the end you will get:

• String[] lines with lines for row
• Row height = lines.lenght * (getFont().getHeight() + topMargin + bottomMargin)

Answer 2

I got the no. of lines properly according to row width & stored it in a Vector & i m doing

int fontHeight = this.getFont().getHeight();

     for (int i = 0; i < linesToDraw .size(); i++)
    {           
        textToDraw = (String)linesToDraw.elementAt(i);
        graphics.drawText(textToDraw, xpos, ypos, 0 , width);
        ypos += fontHeight;
    }

now its drawing the lines but over the previous one as by default listField.setRowHeight() is taking only one row. If there r 2 rows then I write setRowHeight(getFont().getHeight()*2) in drawListRow() but then it goes in loop

If I write setRowHeight() while creating ListField then it comes properly but for all rows same row height is set.

I gets the String to draw at Runtime & the row height should be variable for different rows then how can I setRowHeight() with what parameter & in which method ?

Answer 3

Hi Coldice,

With ur logic I got

* split text on words
* create string array and while words array not empty do
      o create string lineStr
      o while getFont().getAdvance(lineStr+" "+words[i]) < row width move words[i] to lineStr

I m doing it like

if(getFont().getAdvance(lineStr+" "+words[i]) < Display.getWidth())
{
    lineStr += words[i];
}

& I m storing lineStr in a Vector linesToDraw as the same lineStr I m using for storing text of next row.

& in the end for drawing I m doing

for (int i = 0; i < linesToDraw.size(); i++)
{ 
          String textToDraw = (String)linesToDraw.elementAt(i);
          graphics.drawText(textToDraw, 0, y, 0, w);
          y += fontHeight;
}

but how to calculate no. of lines of a row & row height?

so that with this row height I can write setRowHeight(rowHeight) as the row height is different for different rows.