OpenEuphoria

2. RE: Let's try that again --was RE: CText

• Posted by Evan Marshall <evan at net-link.net> Dec 04, 2001
• 393 views

Thanks Brian, 
 I was going to change the for loop to a timer in the near future.
I just wasn't sure how to go about setting up and using the Windows timer.  I'll
try that.



12/4/01 4:50:00 PM, Brian Broker <bkb at cnw.com> wrote:

>
>For those following this thread, I've already replied privately to Evan 
>but here was my reply.
>
>Evan, given your test examples I can offer the following advice:
>
>Rule number one for writing windows programs: Avoid busy-waiting if at 
>all possible.
>
>What's probably happening in the second example is the following:
>procedure Display gets called which queues a message to show the CText.  
>This message doesn't seem to get processed until after your Activation 
>routine.  But you are also hiding your window during Activation so when 
>the routine is done, we process both messages at once.  Show/Hide in 
>succession looks like it's never shown.
>
>Here's how I would re-write the second example to avoid busy waiting
>(the empty for-loop is a delay which is dependent on system speed and
>pushes CPU utilization to max.  That's not good.)
>
>Instead, try something like this:
>
>-- test2.exw --
>include win32lib.ew
>
>constant
>Win  = create(Window, "Window", 0, 0, 0, 600, 600, Normal),
>myCText = create(CText, "This is CText", Win,  250, 200, 100, 15, 0)
>
>sequence seq1
>
>seq1= {0,0,5,0,0}
>
>integer int1, d
>int1 = 5
>
>setVisible(myCText, False)
>
>procedure Display()
>  d = find(int1,seq1)
>  if d then
>    setVisible(myCText, True)
>  end if
>end procedure
>
>procedure onTimer_Win( atom id )
>  if id = 1 then
>    killTimer( Win, id )       -- stop timer
>    setVisible(myCText, False) -- show CText
>  end if
>end procedure
>onTimer[Win] = routine_id( "onTimer_Win" )
>
>procedure ClearText()
>  Display()
>  setTimer( Win, 1, 3000 )  -- 3 second delay
>end procedure
>onActivate[Win] = routine_id( "ClearText" )
>
>WinMain(Win, Normal)
>-- end program --
>
>Hope this helps,
>-- Brian
>
>
>Evan Marshall wrote:
>> This works:
>> ------------------------------
>> include win32lib.ew
>> 
>> constant
>> Win  = create(Window, "Window", 0, 0, 0, 600, 600, Normal),
>> myCText = create(CText, "This is CText", Win,  250, 200, 100, 15, 0)
>> 
>> setVisible(myCText, False)
>> 
>> procedure Display()
>>       setVisible(myCText, True)
>> end procedure
>> onActivate[Win] = routine_id( "Display" )
>> 
>> procedure ClearText()
>>      setVisible(myCText, False)
>> end procedure
>> onClick[Win] = routine_id( "ClearText" )
>> 
>> WinMain(Win, Normal)
>> 
>> This doesn't:
>> --------------------
>> 
>> include win32lib.ew
>> 
>> constant
>> Win  = create(Window, "Window", 0, 0, 0, 600, 600, Normal),
>> myCText = create(CText, "This is CText", Win,  250, 200, 100, 15, 0)
>> 
>> setVisible(myCText, False)
>> 
>> procedure Display()
<snip>

>
>
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