| explicit redraw does nothing until expose(?) event - IDLitComponent propertysheets [message #39125] |
Wed, 21 April 2004 11:42 |
sdettrick
Messages: 14
Registered: December 2003
|
Junior Member |
|
|
Hi,
I've got an object window with a bunch of plots on it. I popup a
WIDGET_PROPERTYSHEET to change the properties of my IDLgrLegend
(registered with IDLitComponent), and it works nicely, but the actual
graphic is never redrawn unless I move my legend around with the
mouse, or drag my popup window over the top of the draw window.
So I add a Re-Draw button to my pop-up property sheet, in the hope
that I can force a draw manually (I make sure it has access to the
right IDLgrWindow and IDLgrView objects). Clicking on my Re-Draw
button multiple times does nothing, until I either click on the legend
or drag the popup over the draw window. Then all my queued Re-Draw
events execute one after the other.
What's happening? Is there a way to get my redraw event processed
immediately? Why doesn't the thing process the event until I expose
or interact with the draw widget?
confused,
Sean
In more detail:
The TLB and Draw widgets are defined as:
tlb = Widget_Base( TLB_Size_Events=1 )
drawID = Widget_Draw(tlb, $
Button_Events=1, $
Expose_Events=1, $
Retain=0, $
Graphics_Level=2, $
Event_Pro='Select_Button_Events')
The plot legend object has SELECT_TARGET=1, so after it is clicked on,
the event handler calls a method of the selected target:
target -> propertysheet, group_leader=event.top, $
window=info.mywindow, $
view=info.myview
This class method pops up a widget with the ReDraw button and the
WIDGET_PROPERTYSHEET. It looks a bit like this:
pro myLegend::PropertySheet, group_leader=group_leader, $
window=window,$
view=view
self.window=window
self.view=view
wpopup = widget_base( /FLOATING, $
GROUP_LEADER=GROUP_LEADER $
)
button = WIDGET_BUTTON( wpopup, $
value='Re-draw window', $
event_pro='handle_all_events', $
UVALUE = {object:self, $
method:'ReDraw'} $
)
result = WIDGET_PROPERTYSHEET( wpopup, $
VALUE = self , $
event_pro = 'handle_all_events', $
UVALUE = {object:self, $
method:'ChangeProperty'} $
)
widget_control, wpopup, /realize
end
(Thanks to David Fanning and Stein Vidar for this way of getting a
class method to be a proxy event handler.)
The handle_all_events.pro routine passes the WIDGET_BUTTON event to
the myLegend::ReDraw method, which is as simple as this:
pro myLegend::ReDraw, event
if event.select eq 1 then begin
print,'REDRAW on request:'
self.window -> Draw, self.view
endif
end
Self.window and self.view are the original draw window and view.
If I click on the button 5 times, nothing happens until I click on the
legend or move the pop-up over the draw window. Then all 5 draw
events execute directly!
Any suggestions?
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
