OpenEuphoria

1. wxEuphoria woes

• Posted by D. Newhall <derek_newhall at yahoo.com> Sep 08, 2005
• 540 views
• Last edited Sep 09, 2005

I've been messing around with wxEuphoria recently trying to learn it (if I'm
going to use GUIs they're going to have to be cross-platform) and I've writen a
simple program that just displays my TODO list in a window. However, after
leaving it running for a few seconds in MS Windows or moving the window the
Windows Task Manager says that EXW.EXE is using around 50% of my CPU (it starts
at 0%) which causes the screen to lock up at times (I have to ctrl-alt-delete and
kill it when that happens). All the program does is open a file and show its
contents so I'm wondering if this is caused by a bug in wxEuphoria or my code or
if that's just how wxEuphoria acts.

Here's my code:

without warning

include wxEuphoria.e
include wxGraphics.e

constant TASKS_FILE = "TODO.txt"

integer fn
fn = open(TASKS_FILE, "r")
if fn = -1 then
    fn = message_box( sprintf("Can't open file %s.", {TASKS_FILE}), "", 0 )
    abort(1)
end if

sequence tasks
tasks = {}
object line

line = gets(fn)
while sequence(line) do
    tasks = append(tasks, line)
    line = gets(fn)
end while


constant FRAME = create(wxFrame, {0, -1, "TODO list", -1, -1, 200, 200})
constant WINDOW = create(wxPanel, {FRAME})


procedure print_tasks(atom this, atom event, atom it, atom event_type)
    atom dc
    dc = create( wxPaintDC, {this})

    for i=1 to length(tasks) do
        wx_puts({this, 0, (i-1) * 15, dc}, tasks[i])
    end for
end procedure

set_event_handler(WINDOW, get_id(WINDOW), wxEVT_PAINT,
  routine_id("print_tasks"))
  
wxMain(FRAME)

The Euphoria Standard Library project :
    http://esl.sourceforge.net/
The Euphoria Standard Library mailing list :
    https://lists.sourceforge.net/lists/listinfo/esl-discussion

3. Re: wxEuphoria woes

• Posted by cklester <cklester at yahoo.com> Sep 08, 2005
• 507 views
• Last edited Sep 09, 2005

D. Newhall wrote:

> set_event_handler(WINDOW, get_id(WINDOW), wxEVT_PAINT,
>   routine_id("print_tasks"))

Okay, you've set it so that every time your window gets repainted, you
run the "print_tasks" item. Probably not a good idea, because it gets
repainted a billion times a second.

Try putting that in the wxEVT_RESIZE or wxEVT_OPEN (or whatever is
appropriate).


-=ck
"Programming in a state of EUPHORIA."
http://www.cklester.com/euphoria/

5. Re: wxEuphoria woes

• Posted by cklester <cklester at yahoo.com> Sep 08, 2005
• 516 views
• Last edited Sep 09, 2005

cklester wrote:
> D. Newhall wrote:
> > set_event_handler(WINDOW, get_id(WINDOW), wxEVT_PAINT,
> >   routine_id("print_tasks"))
> Okay, you've set it so that every time your window gets repainted, you
> run the "print_tasks" item. Probably not a good idea, because it gets
> repainted a billion times a second.
> Try putting that in the wxEVT_RESIZE or wxEVT_OPEN (or whatever is
> appropriate).

PSA: Always ignore all my helpful posts, except the very last one. 8)

-=ck
"Programming in a state of EUPHORIA."
http://www.cklester.com/euphoria/

7. Re: wxEuphoria woes

• Posted by Matt Lewis <matthewwalkerlewis at gmail.com> Sep 09, 2005
• 558 views

D. Newhall wrote:
> 
> cklester wrote:
> > 
> > D. Newhall wrote:
> > > 
> > > procedure print_tasks(atom this, atom event, atom it, atom event_type)
> > >     atom dc
> > >     dc = create( wxPaintDC, {this})
> > > 
> > >     for i=1 to length(tasks) do
> > >         wx_puts({this, 0, (i-1) * 15, dc}, tasks[i])
> > >     end for
> > -- ADD THIS
> >     delete_instance(dc)
> > 
> > > end procedure
> > 
> > That fixed it.
> > 
> > -=ck
> > "Programming in a state of EUPHORIA."
> > <a
> > href="http://www.cklester.com/euphoria/">http://www.cklester.com/euphoria/</a>
> > 
> 
> Yep, that did it. Thanks!
> 

It's usually better to put these sorts of things into a wxListBox or 
something, which will handle all the repainting for you.  Of course, I 
understand this is a learning exercise, but generally you probably don't
want to do your own painting/printing.

Matt Lewis