| Handling mouse events [message #103725] |
Wed, 14 February 2007 06:20  |
Eclipse User |
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Originally posted by: jiri_semecky.cz.ibm.com
Hi,
I'm trying to handle mouse events on particular subfigures of an EditPart.
I added org.eclipse.draw2d.MouseListener to figures (subclasses of
org.eclipse.draw2d.Figure) in XXXFigure.createContents() method.
However the events are caught only if the EditPart consists of a single
Figure. If the figure is more complex (composed of several subfigures,
e.g. compartments), the events do not get to the figure. They are caught
by an instance of ShapeCompartmentFigure, DefaultSizeNodeFigure,
WrapLabel or so, but they are not propagated to the figure directly
created in createContents().
Please, how can be the mouse event handled for subregions of an
EditPart? The EditPolicy mechanism doesn't work here, because it is only
EditPart-grained (without the information which subfigure was clicked).
Thanks for any hint,
Jirka
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| Re: Handling mouse events [message #103802 is a reply to message #103725] |
Wed, 14 February 2007 07:39  |
| Eclipse User |
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Originally posted by: 5d5.mail.ru
SWTEventDispatcher emits draw2d events; you may try to trace what
happens there...
Jiri Semecky wrote:
> Hi,
>
> I'm trying to handle mouse events on particular subfigures of an EditPart.
> I added org.eclipse.draw2d.MouseListener to figures (subclasses of
> org.eclipse.draw2d.Figure) in XXXFigure.createContents() method.
>
> However the events are caught only if the EditPart consists of a single
> Figure. If the figure is more complex (composed of several subfigures,
> e.g. compartments), the events do not get to the figure. They are caught
> by an instance of ShapeCompartmentFigure, DefaultSizeNodeFigure,
> WrapLabel or so, but they are not propagated to the figure directly
> created in createContents().
>
> Please, how can be the mouse event handled for subregions of an
> EditPart? The EditPolicy mechanism doesn't work here, because it is only
> EditPart-grained (without the information which subfigure was clicked).
>
> Thanks for any hint,
> Jirka
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| Re: Handling mouse events [message #103930 is a reply to message #103725] |
Wed, 14 February 2007 09:34 |
| Eclipse User |
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Jirka,
I may have struggled with the same problem as you are when I was working
on the diagram assistants (i.e. the popup bar and connection handles).
The diagram assistant editpolicies are installed on top-level shapes by
default to react to mouse events over the shape. I wanted the diagram
assistants to appear even if the user was hovering over a compartment on
the shape, but as you saw, the mouse events weren't being propogated to
the top-level figure.
To fix this, I created a DelegatingMouseEventsEditPolicy which forwards
all mouse events on its figure (i.e. the compartment) to the parent's
editpolicy of the same role.
Take a look at the code in DelegatingMouseEventsEditPolicy and where it
is installed to understand how it works. This editpolicy is private at
this point, but could be made public I suppose if it is useful to
others. There may be a better way to accomplish this in a more correct
GEF way as I don't think having an editpolicy that delegates mouse
events is something that GEF would do. See
http://help.eclipse.org/help32/topic/org.eclipse.draw2d.doc. isv/guide/hittest.html
for some information on hit testing in GEF which may be of use.
Hope this helps.
- Cherie
Jiri Semecky wrote:
> Hi,
>
> I'm trying to handle mouse events on particular subfigures of an EditPart.
> I added org.eclipse.draw2d.MouseListener to figures (subclasses of
> org.eclipse.draw2d.Figure) in XXXFigure.createContents() method.
>
> However the events are caught only if the EditPart consists of a single
> Figure. If the figure is more complex (composed of several subfigures,
> e.g. compartments), the events do not get to the figure. They are caught
> by an instance of ShapeCompartmentFigure, DefaultSizeNodeFigure,
> WrapLabel or so, but they are not propagated to the figure directly
> created in createContents().
>
> Please, how can be the mouse event handled for subregions of an
> EditPart? The EditPolicy mechanism doesn't work here, because it is only
> EditPart-grained (without the information which subfigure was clicked).
>
> Thanks for any hint,
> Jirka
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