[news.eclipse.platform.swt] Re: Drag and drop woes

[duongn@xxxxxxxxxx (Duong Nguyen)]

The drag effect is just a hint of the items being dragged. On some 
platforms the drag data is null until the drop occurs (not when the drag 
starts). That means dragSetData is called when the mouse is released. It's 
an optimization to prevent data from being created unnecessarily since it 
may not be used if a drop failed for whatever reason. 

If you have access to the dragSource, you can set the dragEffect to null 
to turn off the drag effect.

Duong

David Huebel wrote:

> Duong,

> Thank you for the suggestions.  Sorry for the bogus report.  I used this
> wonderful program to figure out that I wasn't actually setting the data
> after all:

> http://mi.eng.cam.ac.uk/~er258/code/x11.html

> I find the drag effect provided by Eclipse to be most confusing.  It appears
> to use a graphical copy of the currently displayed part of the current
> selection.  Not only did it show me dragging the current selection when in
> fact the drag data was null, but when I select several screenfuls of data
> in my TableViewer, it shows me dragging just the few rows that are on the
> screen when I initiate the drag.  It could be very confusing to users who
> go through many screenfuls of data ctrl-clicking the rows they want, and
> then see only one row being dragged.  Is there any way to turn this effect
> off?  

> -David