[maemo-developers] Problem with Treeview drag and drop

[From: Jeffrey Barish]

Here's more:

When I remove all items from the treeview, motion-notify event works again. 
As long as there is an item in the treeview, I get only button-press and
one motion-notify.

I tried catching the event signal.  With an item present in the treeview, I
am not getting any other events either after the first motion-notify
signal.  Here's the exact sequence of events when I tap and trace in an
open area with an item present in the treeview:

event = <enum GDK_MOTION_NOTIFY of type GdkEventType>
event position (no button1_mask) = 224 281
event = <enum GDK_LEAVE_NOTIFY of type GdkEventType>
event = <enum GDK_ENTER_NOTIFY of type GdkEventType>
event = <enum GDK_BUTTON_PRESS of type GdkEventType>
START position = 224 281
event = <enum GDK_MOTION_NOTIFY of type GdkEventType>
event position = 224 281
event = <enum GDK_BUTTON_RELEASE of type GdkEventType>


Notice that the first event is a motion-notify that I didn't know about
because there was no button1_mask.  The second motion-notify is the one I
knew about.  Apparently the first motion-notify event is associated with
the change in position from where the previous actions left off and the
present ones began.  I also noticed that there is no button-release at the
end of the drag that moved the item into the treeview (which immediately
preceded the sequence above).

With no item in the treeview, I get this sequence of events:

event = <enum GDK_MOTION_NOTIFY of type GdkEventType>
event position (no button1_mask) = 39 337
event = <enum GDK_LEAVE_NOTIFY of type GdkEventType>
event = <enum GDK_ENTER_NOTIFY of type GdkEventType>
event = <enum GDK_BUTTON_PRESS of type GdkEventType>
START position = 39 337
event = <enum GDK_MOTION_NOTIFY of type GdkEventType>
event position = 38 338
... other MOTION_NOTIFY events ...
event = <enum GDK_BUTTON_RELEASE of type GdkEventType>

No difference, except that with an item present I get only the one
motion-notify event.  The only anomaly I'm seeing is that there is no
button-release event on completion of the drag.
-- 
Jeffrey Barish