OpenEuphoria

Re: Dialog wanders when shown repeatedly

• Posted by CChris <christian.cuvier at agricu?ture.gou?.fr> Jan 28, 2008
• 729 views

Tony Bohm wrote:
> 
> --Great first posting, huh?  Didn't mean to hit Send Now, previously.  Sorry
> for the incomplete post + double posting :(
> 
> Hello ;D  I'm trying to get into programming again after a very long hiatus,
> and am running into a problem too simple to wrap my head around XD
> 
> I've defined two windows with the create() function; one of which is intended
> to be the main window, and the other will be called in a button-click handler
> as the need arises.  Depending on the button clicked, setText is used to give
> this secondary window the appropriate title (works OK), and a text label is
> created to show whatever text is appropriate (works OK).  But, this window
> doesn't appear in a consistant (x,y) location relative to the screen corners
> or the primary window, and appears farther up (and usually, but not always,
> farther to the left) relative to its prior position every time it's shown
> after the first time it's displayed during a program run.
> 
> My code looks like this:
> 
> include win32lib.ew
> without warning
> 
> --Main program window
> constant MainWin = create(Window, "etS beta 0.0", 0, Default, Default, 100,
> 100, {WS_DLGFRAME, WS_SYSMENU, WS_MINIMIZEBOX})
> --Secondary message window/dialogue
> constant MsgWin = create(Window, "", MainWin, 200, 200, 100, 100,
> {WS_DLGFRAME,
> WS_SYSMENU})
> 
> --Button click handler
> procedure ButClick(integer self, integer event, sequence parms)
> 	atom hTemp
> 
> 	if self=hHistBut then
> 		setClientRect(MsgWin, 150, 150)
> 		setText(MsgWin, "History..")
> 		hTemp = create(CText, "Blahblahblah", MsgWin, 0, 0, 150, 150, 0)
> 		openDialog(MsgWin)
> 	elsif self=hAboutBut then
> 		setClientRect(MsgWin, 150, 150)
> 		setText(MsgWin, "About")
> 		hTemp = create(CText, "Blarghblargh", MsgWin, 0, 0, 150, 150, 0)
> 		openDialog(MsgWin)
> 	end if
> 
>         destroy(hTemp)
> end procedure
> 
> global procedure IntroScreen()
> 	atom hSplash, hTrim
> 
> 	hSplash = create(Bitmap, ImageSource & "starmap.bmp", MainWin, 0, 0, 668,
> 546, 0)
> 	hTrim = create(Bitmap, ImageSource & "startrim.bmp", MainWin, 668, 0, 60,
> 486, 0)
> 	hStoryBut = create(PictureButton, {"", "History"}, MainWin, 668, 486, 60, 30,
> ImageSource & "storybut.bmp")
> 	hAboutBut = create(PictureButton, {"", "About"}, MainWin, 668, 516, 60, 30,
> ImageSource
> & "aboutbut.bmp")
> 	setHandler({hHistBut, hAboutBut}, w32HClick, routine_id("ButClick"))
> 	setFocus(hStoryBut)
> end procedure
> 
> global procedure main()
> 	setClientRect(MainWin, 728, 546)
> 	IntroScreen()
> end procedure

Actually, the problem was not in the library, but in your code. The following
does work properly (I had to simplify it a little):

include win32lib.ew
without warning

--Main program window
constant MainWin = create(Window, "etS beta 0.0", 0, Default, Default, 100,
100, {WS_DLGFRAME, WS_SYSMENU, WS_MINIMIZEBOX})
--Secondary message window/dialogue
constant MsgWin = create(Window, "", MainWin, 200, 200, 100, 100,
{WS_DLGFRAME,WS_SYSMENU,
-- NOTE THIS
WS_CAPTION,WS_CHILD})

--Button click handler
procedure ButClick(integer self, integer event, sequence parms)
	atom hTemp

		setClientRect(MsgWin, 150, 150)
		setText(MsgWin, "History..")
		hTemp = create(CText, "Blahblahblah", MsgWin, 0, 0, 150, 150, 0)
		openDialog(MsgWin)

        destroy(hTemp)
end procedure
atom hStoryBut
	hStoryBut = create(PushButton, {"", "History"}, MainWin, 168, 186, 60, 30,0)
	setHandler(hStoryBut, w32HClick, routine_id("ButClick"))
	setFocus(hStoryBut)

global procedure main()
	setClientRect(MainWin, 728, 546)
end procedure
main()
WinMain(MainWin,Normal)

create() sets the position of the owned window in terms of the parent window,
but *does not track it afterwards*. For the tracking to take place, you need to
specify the WS_CHILD style, which has a few consequences, some of which are not
always desirable.

Having controls that resize or reposition dynamically according to rules fixed
at creation time is on the to-do list for win32lib, but not for next release.

CChris