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List:       kfm-devel
Subject:    Re: khtml, kbackpage stuff
From:       Lars Knoll <Lars.Knoll () mpi-hd ! mpg ! de>
Date:       2000-03-27 18:36:40
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On Mon, 27 Mar 2000, Frederik Holljen wrote:

> Hi, 
> 
> I'm having some trouble positioning the cursor in our editor. Positioning
> within the text node seems to work fine, so the problem is getting the correct
> x, y position of the surrounding block.(cursor inside a <p> seems to work, but
> in lists and tables it misses the text completely) So, I have a couple of
> questions (to try and sort this out in my head :)
> 
> 1. How does a <P> get rendered. (what  sort of rendering object)

Allmost all regular elements (including <p>) get mapped to a RenderFlow in
the rendering tree.

> 2. The x, y position of the texts containingBlock() are they absolute, or
> relative to something else? (another more toplevel containgBlock perhaps)

The x and y positions are always relative to the objects parent, except
for the root object (RenderRoot). This makes it possible to move a subtree
around in the scrollview, without needing a relayout.

If you need the absolute position, there's a method 
absolutePosition(int &x, int&y) in RenderObject.

> 3. Any special treatments that have to be done for text inside tables?

No.

> I've included the current code (at least on my computer) in case you wanted to
> look at it. And for those who are interested: the kbackpage code can now be
> found in kdenonbeta (it should even compile :D )
> 
> Cheers,
> Frederik
> 
> 
> void RenderText::cursorPos(int offset, int &_x, int &_y, int &height)
> {
>     //FIXME! This is possibly incorrect....
-     _x = ( (RenderBox*)containingBlock() )->xPos();
-     _y = ( (RenderBox*)containingBlock() )->yPos();
+	absolutePosition(x, y);

... and things should be working ;-)

Lars
>     
>     TextSlave *s = m_first;
>     int off = s->len;
>     int y = s->y;
>     
>     while(offset > off)
>     {
>         s=s->next();
>         off += s->len;
>         if( s->y != y )  // ugly hack to fix problem with space removal on line wrap
>         {
>             y = s->y;
>             offset--;
>         }
>     }   // we are now in the correct text slave
>     
>     int pos = s->len - (off - offset );
>     _y += s->y;
>     height = s->m_height;
>     
>     QString tekst(s->m_text, s->len);
>     _x += s->x + (fm->boundingRect(tekst, pos)).right();
>     if(pos)
>         _x += fm->rightBearing( *(s->m_text + pos - 1 ) );
> }
> 
> 

-- 
Lars Knoll                                 knoll@mpi-hd.mpg.de
  PGP pub key [6DADF3D5]: finger knoll@pluto.mpi-hd.mpg.de 

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