Dear Albrecht,
your tips were very helpful !!!
It works fine now ! (I am quite excited after days of frustration.)
Thank you very much, vielen Dank !
GrüÃe
Alexander
(I am using FLTK 1.1.10 on Windows 7 and on XP.)
> On 04.07.2010, at 13:48, Alexander Walz wrote:
> > Dear FLTK community,
> >
> > I would like to integrate the test/editor.cxx editor shipped with FLTK 1.1
> > with a
> > programming language based on Lua 5.1.
>
> which exact FLTK version (e.g. 1.1.10) ?
> which OS ?
>
> > I would like to display strings generated by Lua in real-time in a
> > Fl_Text_Display or
> > Fl_Browser object.
> >
> > My Lua programmes sometimes consume a lot of computing power but should
> > write any intermediate
> > results of the calculations immediately in a FLTK window.
> >
> > However, only after the whole computation finishes, the output is
> > displayed. Even the
> > title bar of the output window appears after the computation ends.
> >
> > Any calls to redisplay, redraw, Fl::flush, show(int line), etc. failed.
>
> For creating and showing windows, Fl::flush() is probably not enough.
> You should try Fl::wait(0.5) and/or Fl::check(). See below for more...
>
> > Object-oriented programming is new to me, as is GUI programming, so please
> > be patient
> > with me. I have not programmed any `update output` callback function yet.
>
> The asynchronous way of GUI programming can be difficult at first...
>
> > Would you please help me ?
>
> Will try ...
>
> > Here is the code:
>
> --- snipped ---
>
> > /* open a new window, and pass any text entered to the interpreter to
> > luaL_loadbuffer; luaL_loadbuffer finally runs the `print` function (if
> > entered by the user) via the C aux_printnonstruct procedure (see above) */
> > void execute_cb (Fl_Widget*, void*) { /* 0.34.0 */
> > int error;
> > const char *buffer;
> > Fl_Window *win = new Fl_Window(640, 480);
> > buff = new Fl_Text_Buffer();
> > disp = new Fl_Text_Display(0, 20, 640, 480, "Output");
> > disp->buffer(buff);
> > win->resizable(*disp);
> > win->show();
>
> FLTK needs to read the system messages related to creation of windows
> at this point, thus Fl::flush() is not enough. You need Fl::check()
> or even Fl::wait() here. If you're on Linux (X11) this might be even
> more difficult. For a first shot, try this:
>
> Fl::wait(0.2);
> Fl::wait(0.2);
> Fl::wait(0.2);
>
> Yes, I mean three times the same statement. Just to see if/how it
> works ...
>
> Note: On Windows, a single Fl::wait() or Fl::check() may be enough,
> but on Linux/X11 things may be different.
>
> > buffer = textbuf->text();
> > error = luaL_loadbuffer(L, buffer, strlen(buffer), "line") ||
> > lua_pcall(L, 0, 0, 0);
> > if (error) {
> > buff->text(lua_tostring(L, -1));
> > agn_poptop(L);
> > }
> > }
>
> I can't see what the long computation would be, and how the display
> update is programmed, but here is how it should work:
>
> Whenever you want to change the display, do something like this:
>
> buff->append(text); // append or set text in buffer
> disp->insert_position(buff->length); // set insert position
> disp->show_insert_position(); // scroll to end of buffer
> disp->redraw(); // redraw the associated Fl_Text_Display
> Fl::check(); // give FLTK the opportunity to do it now
>
> Some of the disp->... operations might not be necessary, but
> I hope that you get the idea. The code is untested, though...
>
> If you can't get it going, please try with a simple complete
> example that can be compiled in one file. You can simulate the
> long computation with some sleep() or Sleep() calls. If you
> need more help, post your simple example here, and we can see
> what's wrong and help you better.
>
> Albrecht
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