Re: Drag/drop from workspace to app icon

[Adrian Robert]

On Jan 14, 2005, at 10:58 AM, Adam Fedor wrote:

> On Jan 12, 2005, at 10:11 AM, Adrian Robert wrote:
> > The problem is though (on GNUstep), the message only seems to be sent 
> > if the app icon is in the lower left of the screen.  This applies to 
> > other apps like TextEdit too.  Put the icon in the lower left, and a 
> > green 'draggable' icon appears when dragging, and it gets the file.  
> > Move it away, and a black 'no' icon appears instead, and no file open 
> > message is received.  Has anyone else experienced this?  I'm using 
> > WindowMaker, is it to blame?  My GWorkspace is CVS from about a month 
> > ago.
>
> There are NSDragging debug log messages you can look at that might 
> help. They print something whenever a drag event gets sent to the app:
>
> openapp MyApp --GNU-Debug=NSDragging

Thanks, I eventually tried this debug (and NSEvent) and ended up 
finding the problem is that no ConfigureNotify events are being sent to 
XGServerEvent for application icon windows.  Thus, the icon is 
initially granted location at lower left, then placed by the window 
manager, possibly moved, etc., but GNUstep never hears about it, and 
the intersection computation when a drag comes is messed up because it 
gets the drag coordinates in root space.  I guess this has something to 
do with WindowMaker, either intercepting server-generated 
ConfigureNotify events or simply not synthesizing them for the app 
icon, because it feels that it is its job to manage it and the app 
should not care.

Perhaps this has been fixed in the ongoing "development version" of 
WindowMaker, or there is some way to configure it to provide the 
ConfigureNotify's?

If there is no fix of this kind, I found that simply tossing in a 
direct determination of the window's coordinates when XGServerEvent 
gets XdndPosition events works around the bug reasonably well.  I'll 
check this in unless someone has a better idea..