| Re: explicit redraw does nothing until expose(?) event - IDLitComponent propertysheets [message #39120 is a reply to message #39097] |
Wed, 21 April 2004 12:29   |
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Chris[2]
Messages: 39
Registered: August 2003
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Member |
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How are you sending the event to your button handler? Are you simply calling
the method directly? Or are you trying to use widget_control with
send_event? Using send_event would be a bad idea.
Why not simply add a win->draw at the end of your property sheet event
handler? You know that if a property changes, you want to redraw.
-Chris
"Sean Dettrick" <sdettrick@hotmail.com> wrote in message
news:c233c3ea.0404211042.19412b3d@posting.google.com...
> 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?
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