OpenEuphoria

1. disappearing text in child window

• Posted by DanM Apr 19, 2009
• 977 views

Below is demo stub for minor problem I'm encountering.
It has two windows, one is child of first, and child has text written to it on activate.

But some few seconds after activation, I regularly hear some hard disk activity,
and the text disappears.

What's up with that?

I know I can make the text reappear "onPaint" the child window,
but that still shows a momentary flicker of the window, which I don't like,
and I'm wondering WHY does the text disappear in the first place,
and what causes the window to flicker when I'm not doing anything
programmatically?

Dan (demo follows)

--  code generated by Win32Lib IDE v0.20.1 
 
  
include Win32lib.ew 
without warning 
 
-------------------------------------------------------------------------------- 
--  Window Window1 
constant Window1 = createEx( Window, "Window1", 0, Default, Default,  
400, 300, 0, 0 ) 
--------------------------------------------------------- 
-------------------------------------------------------------------------------- 
--  Window Window2 
sequence IDEFlags 
IDEFlags = classDefaults(Window, { {1,  
   {WS_SYSMENU,WS_MINIMIZEBOX,WS_MAXIMIZEBOX}},{2, {WS_EX_DLGMODALFRAME}} } ) 
constant Window2 = createEx( Window, "Window 2", Window1,  
    Default, Default, 331, 195,  
   {WS_CHILD, WS_CLIPSIBLINGS, WS_BORDER, WS_DLGFRAME,  
    WS_THICKFRAME, WS_CAPTION, WS_SYSMENU, WS_MINIMIZEBOX,  
WS_MAXIMIZEBOX}, {WS_EX_DLGMODALFRAME} ) 
moveZOrder( Window2, HWND_TOP) 
--------------------------------------------------------- 
-------------------------------------------------------------------------------- 
procedure Window1_onActivate (integer self, integer event, sequence params)--params is () 
   openWindow(Window2, Normal) 
end procedure 
setHandler( Window1, w32HActivate, routine_id("Window1_onActivate")) 
-------------------------------------------------------------------------------- 
procedure Window2_onActivate (integer self, integer event, sequence params)--params is () 
  wPuts(Window2, "here is some text") 
end procedure 
setHandler( Window2, w32HActivate, routine_id("Window2_onActivate")) 
 
 
WinMain( Window1,Normal ) 

3. Re: disappearing text in child window

• Posted by DanM Apr 19, 2009
• 972 views

Derek,

I should've saved time and noted: I'm using XP SP3, Win32Lib 0.60.6, Eu 2.5

Dan

5. Re: disappearing text in child window

• Posted by DanM Apr 23, 2009
• 972 views

Thanks for responding Greg!

I'll look at using a label, not sure at this point if that will completely suffice.

But what really confuses me is that the text disappearing seems to be somewhat specific to *my* system, as it *doesn't* disappear for Derek running my demo code. Does my demo disappear for you? For me, it disappears, that is, there must be as you said, a Paint event asserted, at exactly the same moment that I hear a hard disk access, but with no *programmatic* event occurring to assert the Paint event.

And the reason I put \\ at the end of my lines in the original post is because the demo code did not wrap, so when I read my own post and probably any responses, the wrapping of both my text and any responses go out as far as the longest line of code, so I have to scroll sideways over to read every line of response, which is a hassle, so I make my post have "shorter" lines by forcing line breaks. I guess that doesn't help me to read responses, as they'll probably auto-use the longest line as a limit to wrap to, but at least I don't have to scroll sideways to read each line of my own post. This may also be an artifact of my browsers setting for font size. It doesn't hurt to force line breaks, right?

Dan

7. Re: disappearing text in child window

• Posted by DanM Apr 23, 2009
• 943 views
• Last edited Apr 24, 2009

That's a good observation, I'll see if I can find out.

Well, of course your example looks really weird,
but the way I break lines up is just by phrases, or sentences,
so it doesn't look that weird!
(I'm using slightly larger fonts, so maybe with smaller ones
it does look weird?)
But you can read this without having to scroll sideways,
unlike the following:

see, here is a really long line of text, could be a line of code of course, which even though you have to scroll sideways to read this, you DON'T have to scroll sideways to read the above.