Re: [MiNT] Dialogs in windows

[Henk Robbers <h.robbers@chello.nl>]

Hi

I have rewritten your example as attached.


As Draco pointed out, the FIRST/NEXT_XYWH loop gives you all the
visible rectangles. This is usefull if you want to update your
window contents yourself.

On a WM_REDRAW you must intersect all the rectangles with the
rectangle of the WM_REDRAW message.
This reduces the amount of repainted area considerably.


-- 
Groeten; Regards.
Henk Robbers.    mailto:h.robbers@chello.nl
                   http://members.ams.chello.nl/h.robbers/Home.html
Interactive disassembler:     TT-Digger;  http://digger.atari.org
A GEM replacement for MiNT:   XaAES;      http://xaaes.atari.org
A Home Cooked teXt editor:    AHCX
The free desktop:             TERADESK

static
int min( int a, int b)
{	return a < b ? a : b; }

static
int max( int a, int b)
{	return a > b ? a : b; }

int rc_intersect(RECT *r1,RECT *r2)
{
   int xl, yu, xr, yd;      /* left, upper, right, down */

   xl = max( r1->x, r2->x );
   yu = max( r1->y, r2->y );
   xr = min( r1->x + r1->w,
             r2->x + r2->w );
   yd = min( r1->y + r1->h,
             r2->y + r2->h );

   r2->x = xl;
   r2->y = yu;
   r2->w = xr - xl;
   r2->h = yd - yu;

   return( r2->w > 0 && r2->h > 0 );
}

/* x, y, w, h is the rectangle supplied by WM_REDRAW */
static
void redraw_mywindow( short my_window, short x, short y, short w, short h )
{
    GRECT t1, t2, r;

    wind_get_grect( my_window,
      WF_WORKXYWH,
      &r );

    /* this is my infodialog that should be redrawn
    infodialog->ob_x = r.g_x + 2;
    infodialog->ob_y = r.g_y + 2;
    infodialog->ob_width = r.g_w - 4;
    infodialog->ob_height = r.g_h - 4;

    t2.g_x     = x;
    t2.g_y     = y;
    t2.g_w     = w;
    t2.g_h     = h;

    wind_update( BEG_UPDATE );

    wind_get( my_window, WF_FIRSTXYWH, &t1.g_x, &t1.g_y, &t1.g_w, &t1.g_h );
    while ( t1.g_w && t1.g_h )
    {
       if ( rc_intersect( &t2, &t1 )
         objc_draw( infodialog, ROOT, MAX_DEPTH,
                   t1.g_x, t1.g_y, t1.g_w, t1.g_h );

       wind_get( my_window, WF_NEXTXYWH, &t1.g_x, &t1.g_y, &t1.g_w, &t1.g_h );
    }

    wind_update( END_UPDATE );  /* Fenstererneuerung beendet */
}