Re: drag-and-drop multiple items from a TreeView

[muppet <scott asofyet org>]

On Mar 27, 2005, at 6:58 PM, Jeff 'japhy' Pinyan wrote:

> $l_tree->enable_model_drag_source(
>   ['GDK_SHIFT_MASK', 'GDK_CONTROL_MASK', 'GDK_BUTTON1_MASK'],
>   'GDK_ACTION_MOVE',
>   $l_entry
> );
> $r_tree->enable_model_drag_dest('GDK_ACTION_MOVE', $l_entry);
>
> The problem is not SELECTING multiple items (I have that taken care 
> of), the problem is the widget is not dragging the items when I hold 
> the left mouse button down when Shift or Control is pressed.

> In fact, the GDK_*_MASK flags I'm passing don't appear to be doing 
> anything at all.  I can replace them with just [], and the single-item 
> drag works...

the button mask is passed straight to gtk_drag_source_set(), which 
stores them away for later use in the private helper function 
gtk_drag_source_event_cb(), which uses the value to determine whether a 
grab should start.  this function only checks the button mask, and as 
such, the shift-mask and control-mask are just ignored.  for better or 
worse, it seems to be on purpose.  it is, after all, a button mask, and 
not a modifier state mask.

using the simplelist.pl example set to reorderable, i can get drags to 
start regardless of whether shift or control are pressed, but with 
control the drop site doesn't move.


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