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Widget_Draw - Help [message #27339]

Thu, 18 October 2001 12:55

Logan Lindquist
Messages: 50
Registered: October 2001

Member

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<DIV><FONT face=Arial size=2>I figured I would start with something
easy, trying to create widget that displays images
in Widget_Draw.  I am trying to pass the wdraw variable in a
Struct to the button procedure event handler. The event handler then calls
a procedure that will hopefully open the file, resize the image and display in
the wdraw window. Right now I am getting an error saying that my wdraw variable
is undefined. Some hints to what I am doing wrong, would be greatly appreciated!
</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Widget_Draw creation</FONT></DIV>
<DIV><FONT face=Arial size=2>*****</FONT></DIV>
<DIV><FONT face=Arial size=2> wdraw = Widget_Draw(wbase_col, XSize=256,
YSize=256,$<BR>    Graphics_Level=2, Expose_Events=1, Retain=0,
$<BR>   Event_Func ='image_expose')</FONT></DIV>
<DIV><FONT face=Arial size=2>****</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Creating the Struct </FONT></DIV>
<DIV><FONT face=Arial size=2>****</FONT></DIV>
<DIV><FONT face=Arial size=2>info = {  wdraw:wdraw,$<BR>   
 wid:wid }</FONT></DIV>
<DIV><FONT face=Arial size=2>Widget_Control, wbase, Set_UValue=info,
/No_Copy<BR>*****</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The button event handler code</FONT></DIV>
<DIV><FONT face=Arial size=2>*****</FONT></DIV>
<DIV><FONT face=Arial size=2>Widget_Control, event.top, Get_UValue=info,
/No_Copy<BR>  selectFile, info.wdraw<BR> Widget_Control,
info.wdraw, Set_UValue=info, /No_Copy<BR>*****</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The file select procedure relating to the finding
the Draw Widget</FONT></DIV>
<DIV><FONT face=Arial size=2>*****</FONT></DIV>
<DIV><FONT face=Arial size=2>Widget_Control, wdraw, Get_Value=wid,
/No_Copy<BR>oldWin = !D.WINDOW<BR>WSET, wid<BR> loadct, 0,
/SILENT<BR>erase,wid<BR>*****</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks,</FONT></DIV>
<DIV><FONT face=Arial size=2>Logan Lindquist</FONT></DIV>
<DIV><FONT face=Arial size=2><A
href="mailto:llindquist@mrdoc.cc">llindquist@mrdoc.cc</A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></BODY></HTML>

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Re: Widget_Draw - Help [message #27435 is a reply to message #27339]

Tue, 23 October 2001 14:26

Pavel A. Romashkin
Messages: 531
Registered: November 2000

Senior Member

In the event handler, get the value of the draw widget and set that to
be the active window:

widget_control, Draw_ID, get_value=w_ID
wset, w_ID

You can also make the event handler return the focus to the originally
active direct graphics window.
Check out http://spot.colorado.edu/~romashki/idl/smart_w.pro to see how
the window focusing can be accomplished.

> Logan Lindquist wrote:
>
> How do I get the image to stay in the Widget_Draw when I click on
> another window? I was thinking that by coding in the PRO that the
> Widget_Draw calls [in the initialization], something updates the
> image. Is this the correct way to do that?
>
> Thanks,
>
> Logan

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