| Re: Problem with sensitivity of a Draw widget (also in XROI.pro) [message #38436 is a reply to message #38424] |
Mon, 08 March 2004 06:57  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Ahammer Helmut writes:
> I'm working on an interactive widget with several buttons, text and a
> draw widget for image display, scrolling and curser information. The
> last thing I implemented was the curser information (with
> keyword/motion_event). Now the curser position and the grey value of
> the image are displayed if the curser moves over the image. But now
> there emerged a problem I had not before. If the scrolling bar is
> moved with the mouse and after the mouse button is released and if the
> mouse thereafter is moved instantly over the image display, then the
> scrolling event is not finished readily. The viewport is not scrolled
> instantly. The viewport is scrolled step by step and the whole scroll
> event need much more time (up to 10-20 seconds). It seems that the
> curser motion events are handled before the scroll event has finished.
> I used the sensitive keyword, but it didn't help.
> Furthermore, XROI.pro does the same. I`m using IDL 6.0 with W2k
With XROI I can stop this from happening by turning draw
widget MOTION events OFF while I process the viewport event
and then turning them back on. Here is the code I changed:
pro xroi__Viewport, sEvent
compile_opt idl2, hidden
; Handle viewport move (scroll) event in the draw area.
WIDGET_CONTROL, sEvent.top, GET_UVALUE=pState
Widget_control,(*pState).wDraw, Draw_Motion_Events=0, /Clear_Events
;^^^^^^^^^^^^^^
draw_geom = WIDGET_INFO((*pState).wDraw, /GEOM)
; On Motif, the geom.xsize may include room for scrollbar even if
; no scrollbar present. Restrict size to <= to the virtual canvas.
draw_xsize = draw_geom.xsize < draw_geom.draw_xsize
draw_ysize = draw_geom.ysize < draw_geom.draw_ysize
(*pState).oView->SetProperty, $
VIEWPLANE_RECT=[sEvent.x, sEvent.y, draw_xsize, draw_ysize]
; If we know our draw time is long, then set the hourglass.
if ((*pState).draw_time gt 0.1) then $
WIDGET_CONTROL, /HOURGLASS
(*pState).oWindow->Draw, (*pState).oView
Widget_control, (*pState).wDraw, Draw_Motion_Events=1, /Clear_Events
;^^^^^^^^^^^^^^
end
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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