| Drag & Drop [message #118498] |
Thu, 19 February 2004 17:57  |
Eclipse User |
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Originally posted by: sandip.us.ibm.com
I am trying to customize dnd operations on the graphical viewer for the GEF
logic example
so that an item from the pallette can be only dropped into certain but not
all region of the
GraphicalViewer. To do this, I override the following methods in the
LogicTemplateTransferDropTargetListener class (the idea is I will check for
validity of a
drop inside these methods):
public void
dragEnter(DropTargetEvent event)
{
System.err.println("dragEnter called");
super.dragEnter(event);
}
protected void handleDragOver()
{
System.err.println("handleDragOver called");
super.handleDragOver();
}
protected void
handleHover()
{
System.err.println("handleHover called");
super.handleHover();
}
However, none of these methods are called when I select an item from the
pallet and move the cursor
over the GraphicalViewer area. Am I missing something here?
Thanks.
- Sandip
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| Re: Drag & Drop [message #119056 is a reply to message #118771] |
Mon, 23 February 2004 11:44  |
| Eclipse User |
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Originally posted by: none.us.ibm.com
DND is only used if you hold down the mouse. Hence the name. What you are
seeing is the creation tool's cursor, which looks similar. It allows
creation, but the mechanism/callbacks are standard mouse events, not DND.
"Sandip Lahiri" <sandip@us.ibm.com> wrote in message
news:c165ka$7td$1@eclipse.org...
> OK, here's what's happening: when I select a pallette item and hold down
the
> left mouse button, then the callbacks are getting called when I move the
> mouse over the graphical editor. However, if simply select a pallette item
> and then move the mouse *without* holding its left button down over the
> graphical editor the callbacks are *not* getting called. However, the
cursor
> is changing to DND OK shape in both the cases.
>
> - Sandip
>
> "Sandip Lahiri" <sandip@us.ibm.com> wrote in message
> news:c13eud$4in$1@eclipse.org...
> > I am trying to customize dnd operations on the graphical viewer for the
> GEF
> > logic example
> > so that an item from the pallette can be only dropped into certain but
not
> > all region of the
> > GraphicalViewer. To do this, I override the following methods in the
> > LogicTemplateTransferDropTargetListener class (the idea is I will check
> for
> > validity of a
> > drop inside these methods):
> >
> > public void
> >
> > dragEnter(DropTargetEvent event)
> >
> > {
> >
> > System.err.println("dragEnter called");
> >
> > super.dragEnter(event);
> >
> >
> > }
> >
> > protected void handleDragOver()
> >
> > {
> >
> > System.err.println("handleDragOver called");
> >
> > super.handleDragOver();
> >
> > }
> >
> > protected void
> >
> > handleHover()
> >
> > {
> >
> > System.err.println("handleHover called");
> >
> > super.handleHover();
> >
> > }
> >
> > However, none of these methods are called when I select an item from the
> > pallet and move the cursor
> >
> > over the GraphicalViewer area. Am I missing something here?
> >
> > Thanks.
> >
> > - Sandip
> >
> >
>
>
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| Re: Drag & Drop [message #119095 is a reply to message #119056] |
Mon, 23 February 2004 12:53 |
| Eclipse User |
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Originally posted by: sandip.us.ibm.com
Randy, mucho thanks!!!
- Sandip
"Randy Hudson" <none@us.ibm.com> wrote in message
news:c1daf2$dk4$1@eclipse.org...
> DND is only used if you hold down the mouse. Hence the name. What you
are
> seeing is the creation tool's cursor, which looks similar. It allows
> creation, but the mechanism/callbacks are standard mouse events, not DND.
>
> "Sandip Lahiri" <sandip@us.ibm.com> wrote in message
> news:c165ka$7td$1@eclipse.org...
> > OK, here's what's happening: when I select a pallette item and hold down
> the
> > left mouse button, then the callbacks are getting called when I move the
> > mouse over the graphical editor. However, if simply select a pallette
item
> > and then move the mouse *without* holding its left button down over the
> > graphical editor the callbacks are *not* getting called. However, the
> cursor
> > is changing to DND OK shape in both the cases.
> >
> > - Sandip
> >
> > "Sandip Lahiri" <sandip@us.ibm.com> wrote in message
> > news:c13eud$4in$1@eclipse.org...
> > > I am trying to customize dnd operations on the graphical viewer for
the
> > GEF
> > > logic example
> > > so that an item from the pallette can be only dropped into certain but
> not
> > > all region of the
> > > GraphicalViewer. To do this, I override the following methods in the
> > > LogicTemplateTransferDropTargetListener class (the idea is I will
check
> > for
> > > validity of a
> > > drop inside these methods):
> > >
> > > public void
> > >
> > > dragEnter(DropTargetEvent event)
> > >
> > > {
> > >
> > > System.err.println("dragEnter called");
> > >
> > > super.dragEnter(event);
> > >
> > >
> > > }
> > >
> > > protected void handleDragOver()
> > >
> > > {
> > >
> > > System.err.println("handleDragOver called");
> > >
> > > super.handleDragOver();
> > >
> > > }
> > >
> > > protected void
> > >
> > > handleHover()
> > >
> > > {
> > >
> > > System.err.println("handleHover called");
> > >
> > > super.handleHover();
> > >
> > > }
> > >
> > > However, none of these methods are called when I select an item from
the
> > > pallet and move the cursor
> > >
> > > over the GraphicalViewer area. Am I missing something here?
> > >
> > > Thanks.
> > >
> > > - Sandip
> > >
> > >
> >
> >
>
>
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