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[STR New]
Link: http://www.fltk.org/str.php?L2304
Version: 1.3-current
I looked into this and reduced the problem to a much smaller demo program.
First I couldn't reproduce the bug, but then I added a big Fl_Group widget
to the Fl_Scroll, and then the bug showed up as in the OP's test program.
Please see instructions in the attached file scroll_1.cxx.
Currently my suspicion is that it either has to do with fl_scroll() or
with clipping, but that needs to be investigated. Both use system specific
functions...
Link: http://www.fltk.org/str.php?L2304
Version: 1.3-current
/*
This demo program shows the drawing bug (STR #2304) on Linux, but works
well on Windows (Mac currently untested).
Compile and run with:
fltk-config --compile scroll_1.cxx && ./scroll_1
The bug can only be seen if the Fl_Scroll widget has a Fl_Group child,
and this Fl_Group becomes more than 32767 pixels high by adding more than
about 1310 child widgets and resizing the Fl_Group accordingly.
It works okay, if the Fl_Group is omitted and the Fl_Box child widgets
are added directly to the Fl_Scroll widget.
Please define USE_GROUP to 1 to see the bug
and define USE_GROUP to 0 to see that it works okay
*/
#define USE_GROUP 1 // 0 works okay, 1 shows the bug
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Scroll.H>
#include <stdio.h>
#define SIZE (1600)
#define WIDTH (160)
#define HEIGHT (25)
int main(int argc, char **argv)
{
char text[40];
Fl_Double_Window *win = new Fl_Double_Window (250,320,"Scrolling test");
win->begin();
Fl_Scroll *scroll = new Fl_Scroll (20, 15, 200, 250);
// scroll->type(FL_VERTICAL);
scroll->box(FL_BORDER_BOX);
scroll->begin();
#if USE_GROUP
Fl_Group *g = new Fl_Group(21,15,180,SIZE*HEIGHT);
g->box(FL_FLAT_BOX);
g->color(FL_YELLOW);
g->begin();
#endif
int x = 23, y = 15;
for (int i=0; i<SIZE; i++) {
sprintf (text,"game %d",i);
Fl_Box *b = new Fl_Box(x,y,WIDTH,HEIGHT);
b->copy_label(text);
b->box(FL_BORDER_BOX);
y += HEIGHT;
}
#if USE_GROUP
g->end();
printf("g=%p, g->resizable() = %p\n",g,g->resizable());
#endif
scroll->end();
printf ("max. y = %d\n",y);
win->end();
win->show(argc,argv);
return Fl::run();
}
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