Re: sorry (Drag n Drop)

["VijayaKumar S. Kale" <vsk telco co in>]

Thanx for help.

I have gone through it.
What you have suggested is, to implement "drag_motion" to destination.
But I think implementation should be on source.  Because "drag_motion" of
destination gets called when pointer moves or enteres on it. And I want to
set pointer(of my choice) from start of dragging, so that it will show me set
pointer any where on the screen even if I have not entered the destination.
Will you plz. clear my doubts.

Thanx

Vijay
------

learfox@furry.ao.net wrote:

> > Is there any function or method to set cursor. Or shall I ungrab source
> > widget and grab it again
> > passing cursor of my choice.   But where to ungrab and grab source?
>
> Hi, I'm the original author that wrote the GTK+ Drag and Drop tutorial.
>
> I've experimented with this area of GTK+'s implmentation of DND for quite
> some time.
>
> Although I have never actually tried to change the pointer cursor (as what
> you are trying to do) I have modified drag status during drag and the
> steps to change the cursor may be similar so atleast I can give you a
> lead.
>
> First when you set up your destination widget, use:
>
>         gtk_drag_dest_set(
>             widget,
> /*          GTK_DEST_DEFAULT_MOTION | */
>             GTK_DEST_DEFAULT_HIGHLIGHT |
>             GTK_DEST_DEFAULT_DROP,
>             target_entry, total_target_entries,
>             actions
>         );
>
> Note that GTK_DEST_DEFAULT_MOTION is commented out, this is so that we can
> handle the "drag_motion" signal. So just below that put:
>
>         gtk_signal_connect(
>             GTK_OBJECT(widget), "drag_motion",
>             GTK_SIGNAL_FUNC(GUIDragMotionCB), cb_data_ptr
>         );
>
> Now for our GUIDragMotionCB() function:
>
> gboolean GUIDragMotionCB(
>         GtkWidget *widget, GdkDragContext *dc,
>         gint x, gint y, guint t,
>         gpointer data
> )
> {
>         gbool same;
>         GtkWidget *source_widget;
>         GdkDragAction action;
>
>         /* Get source widget and check if it is the same as the
>          * destination widget.
>          */
>         source_widget = gtk_drag_get_source_widget(dc);
>         same = ((source_widget == widget) ? TRUE : FALSE);
>
>         /* Insert code to get our default action here. */
> /* Change this as needed. */
>         action = GDK_ACTION_MOVE;
>
>         /* Respond with default drag action (status). First we check
>          * the dc's list of actions. If the list only contains
>          * move or copy then we select just that, otherwise we return
>          * with our default suggested action.
>          * If no valid actions are listed then we respond with 0.
>          */
>
>         /* Only move? */
>         if(dc->actions == GDK_ACTION_MOVE)
>             gdk_drag_status(dc, GDK_ACTION_MOVE, t);
>         /* Only copy? */
>         else if(dc->actions == GDK_ACTION_COPY)
>             gdk_drag_status(dc, GDK_ACTION_COPY, t);
>         /* Our default action in list? */
>         else if(dc->actions & action)
>             gdk_drag_status(dc, action, t);
>         /* All else respond with 0. */
>         else
>             gdk_drag_status(dc, 0, t);
>
>         return(TRUE);
> }
>
> What you've seen above is basically changing the drag action based on
> what the source widget and target widget's attributes.
>
> The modification of a cursor *MIGHT* be done in a similar way.
>
> So I would recommend trying to add some experimental code to the above
> function. Maybe inserting some gdk cursor setting functions or regrabbing
> the pointer (may be messy).
>
> I've been stumped on the same problem you have and this is the best lead I
> can give you at the moment. If I find anything new I'll post it on the
> GTK+ list, good luck!!! :)
>
> --
> Sincerely,                  ,"-_                         \|/
> -Capt. Taura M.             ,   O=__                    --X--
> ..__                         ,_JNMNNEO=_                 /|\
> OMNOUMmnne.                  {OMMNNNEEEEOO=_
> UOOOBIOOOEOMMn.               'LONMMMMNNEEEOOO=.__..,,..
> UUOOEUUOOOOOOOObe              '"=OMMMMWNEEEOOOOO,"=OEEEOO=,._
> OOUUUIEEIOONNOIUbe.                "7OMMMMNNNNNWWEEEEOOOOOO"   "'.
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>                  http://furry.ao.net/~learfox/

--

---------------------------------------------------------------------
        VIJAYKUMAR S. KALE
ESG, TTIL, Telco Campus,PUNE - 411 018
email:  vskale@telco.co.in
phone:  (off.)  +91-212-7402049 (Direct)
                +91-212-7402947 (Direct)
        (resi.) +91-212-4358085
----------------------------------------------------------------------
~


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