| UPDATE : Model-View-Controller Question [message #150496] |
Fri, 10 September 2004 16:58  |
Eclipse User |
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Originally posted by: patrick.sirr.embarcadero.com
Sorry, the MVC question below is not acurate. My problem was not in moving
the figure. I can do that through the model. It was the next step I left
out.
I want to select the new figure that got created and begin an automatic edit
on the new figures first label - the name. But all I have is the model. Do
I fire a property events from the model (ie
firePropertyChange("SELECT_YOURSELF"...) and then
firePropertyChange("BEGIN_EDIT"...). I'm worried about 2 things
1. firing property changes means that more commands get added to my undo
stack. I'd like one compound command with the model element creation,
selection and editing.
2. Other listeners to the model. Should I be? I know the first listener
is the EditPart for the figure that just got created. Would it voilate MVC
to fire a property on ONLY the first listener?
Thanks. Sorry for the confusion! I'm just now getting my mind wrapped
around the GEF!
Patrick
"psirr" <patrick.sirr@embarcadero.com> wrote in message news:...
> Hello - I understand the GEF MVC model. I have a problem though that I
> can't fit into that archetecture. I was hoping for some help.
>
> Normal MVC :
> User Grabs a figure with the mouse
> Figure's EditPart is queried for a command using a request.
> The EditPart's installed policies fulfil that request for a command
> Command is executed changing the Model
> The Model sends a property change (ie location) to the listenters (ie the
> EditPart)
> The Edit part receives and says 'updateVisuals' to get the figure to
update.
>
> Here's my situation. Anyone have any ideas on how to fit this into the
MVC
> paradigm? :
> User hits the SWT.INSERT key on the diagram
> The insert key is received and a command is created and executed to create
a
> new model element
> Problem -> Within that command I'd like to position the new figure in the
> center of the diagram. My problem is though that I've created the new
model
> element and I know that it's first listener is the EditPart I need, but
> casting that first listener to an EditPart violates MVC. How can I get
the
> figure created by the step above and position it without violating MVC?
>
> Thanks!
>
> Patrick
>
>
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| Re: UPDATE : Model-View-Controller Question [message #150590 is a reply to message #150552] |
Sun, 12 September 2004 01:19  |
| Eclipse User |
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Originally posted by: psirr.earthlink.net
Thanks for the help, but in this situation a tool isn't involved. In my
editor I've placed an action against the INSERT key :
handler.put(KeyStroke.getPressed(SWT.INSERT, 0), myAction());
So the action fires and the edit policy returns a command and the command
does
mParent.addChild(new MyModelElement);
This creates a new edit part, and then a figure. After the addChild I now
need to begin a direct edit. Do I...
1. Tell the model to fire off a "start editing yourself" property change
event? Do I need to worry about more then one listener?
2. Cast the first listener to an EditPart and send that guy a
REQ_DIRECT_EDIT? That would violate MVC wouldn't it?
Thanks!
"Pratik Shah" <ppshah@us.ibm.com> wrote in message
news:chveop$foi$1@eclipse.org...
> Subclass CreationTool and override performCreation(). The CreationTool
> selects the newly created part for you already. Just add some code like
> this:
>
> editPart.performRequest(new Request(REQ_DIRECT_EDIT));
>
> Any EditPart that supports Direct Editing will then go into that mode upon
> creation. If you're not sure how to get the newly created EditPart, look
at
> CreationTool#selectAddedObject().
>
> "psirr" <patrick.sirr@embarcadero.com> wrote in message
> news:chsm88$bdp$1@eclipse.org...
> > Sorry, the MVC question below is not acurate. My problem was not in
> moving
> > the figure. I can do that through the model. It was the next step I
left
> > out.
> >
> > I want to select the new figure that got created and begin an automatic
> edit
> > on the new figures first label - the name. But all I have is the model.
> Do
> > I fire a property events from the model (ie
> > firePropertyChange("SELECT_YOURSELF"...) and then
> > firePropertyChange("BEGIN_EDIT"...). I'm worried about 2 things
> >
> > 1. firing property changes means that more commands get added to my
undo
> > stack. I'd like one compound command with the model element creation,
> > selection and editing.
> > 2. Other listeners to the model. Should I be? I know the first
listener
> > is the EditPart for the figure that just got created. Would it voilate
> MVC
> > to fire a property on ONLY the first listener?
> >
> > Thanks. Sorry for the confusion! I'm just now getting my mind wrapped
> > around the GEF!
> >
> > Patrick
> >
> >
> > "psirr" <patrick.sirr@embarcadero.com> wrote in message news:...
> > > Hello - I understand the GEF MVC model. I have a problem though that
I
> > > can't fit into that archetecture. I was hoping for some help.
> > >
> > > Normal MVC :
> > > User Grabs a figure with the mouse
> > > Figure's EditPart is queried for a command using a request.
> > > The EditPart's installed policies fulfil that request for a command
> > > Command is executed changing the Model
> > > The Model sends a property change (ie location) to the listenters (ie
> the
> > > EditPart)
> > > The Edit part receives and says 'updateVisuals' to get the figure to
> > update.
> > >
> > > Here's my situation. Anyone have any ideas on how to fit this into
the
> > MVC
> > > paradigm? :
> > > User hits the SWT.INSERT key on the diagram
> > > The insert key is received and a command is created and executed to
> create
> > a
> > > new model element
> > > Problem -> Within that command I'd like to position the new figure in
> the
> > > center of the diagram. My problem is though that I've created the new
> > model
> > > element and I know that it's first listener is the EditPart I need,
but
> > > casting that first listener to an EditPart violates MVC. How can I
get
> > the
> > > figure created by the step above and position it without violating
MVC?
> > >
> > > Thanks!
> > >
> > > Patrick
> > >
> > >
> >
> >
>
>
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| Re: UPDATE : Model-View-Controller Question [message #150598 is a reply to message #150590] |
Sun, 12 September 2004 15:26 |
| Eclipse User |
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Originally posted by: psirr.earthlink.net
Pratik - Thanks for the help. In reading through the source for
CreationTool I found what I needed. The EditPartViewer has an
EditPartFactory. Using that object I can convert a model element to an
EditPart thusly...
EditPartViewer viewer = getCurrentViewer();
Object editpart = viewer.getEditPartRegistry().get(model);
Thanks!
"Patrick" <psirr@earthlink.net> wrote in message
news:ci07vd$7tj$1@eclipse.org...
> Thanks for the help, but in this situation a tool isn't involved. In my
> editor I've placed an action against the INSERT key :
>
> handler.put(KeyStroke.getPressed(SWT.INSERT, 0), myAction());
>
> So the action fires and the edit policy returns a command and the command
> does
>
> mParent.addChild(new MyModelElement);
>
> This creates a new edit part, and then a figure. After the addChild I now
> need to begin a direct edit. Do I...
>
> 1. Tell the model to fire off a "start editing yourself" property change
> event? Do I need to worry about more then one listener?
> 2. Cast the first listener to an EditPart and send that guy a
> REQ_DIRECT_EDIT? That would violate MVC wouldn't it?
>
> Thanks!
>
> "Pratik Shah" <ppshah@us.ibm.com> wrote in message
> news:chveop$foi$1@eclipse.org...
> > Subclass CreationTool and override performCreation(). The CreationTool
> > selects the newly created part for you already. Just add some code like
> > this:
> >
> > editPart.performRequest(new Request(REQ_DIRECT_EDIT));
> >
> > Any EditPart that supports Direct Editing will then go into that mode
upon
> > creation. If you're not sure how to get the newly created EditPart,
look
> at
> > CreationTool#selectAddedObject().
> >
> > "psirr" <patrick.sirr@embarcadero.com> wrote in message
> > news:chsm88$bdp$1@eclipse.org...
> > > Sorry, the MVC question below is not acurate. My problem was not in
> > moving
> > > the figure. I can do that through the model. It was the next step I
> left
> > > out.
> > >
> > > I want to select the new figure that got created and begin an
automatic
> > edit
> > > on the new figures first label - the name. But all I have is the
model.
> > Do
> > > I fire a property events from the model (ie
> > > firePropertyChange("SELECT_YOURSELF"...) and then
> > > firePropertyChange("BEGIN_EDIT"...). I'm worried about 2 things
> > >
> > > 1. firing property changes means that more commands get added to my
> undo
> > > stack. I'd like one compound command with the model element creation,
> > > selection and editing.
> > > 2. Other listeners to the model. Should I be? I know the first
> listener
> > > is the EditPart for the figure that just got created. Would it
voilate
> > MVC
> > > to fire a property on ONLY the first listener?
> > >
> > > Thanks. Sorry for the confusion! I'm just now getting my mind
wrapped
> > > around the GEF!
> > >
> > > Patrick
> > >
> > >
> > > "psirr" <patrick.sirr@embarcadero.com> wrote in message news:...
> > > > Hello - I understand the GEF MVC model. I have a problem though
that
> I
> > > > can't fit into that archetecture. I was hoping for some help.
> > > >
> > > > Normal MVC :
> > > > User Grabs a figure with the mouse
> > > > Figure's EditPart is queried for a command using a request.
> > > > The EditPart's installed policies fulfil that request for a command
> > > > Command is executed changing the Model
> > > > The Model sends a property change (ie location) to the listenters
(ie
> > the
> > > > EditPart)
> > > > The Edit part receives and says 'updateVisuals' to get the figure to
> > > update.
> > > >
> > > > Here's my situation. Anyone have any ideas on how to fit this into
> the
> > > MVC
> > > > paradigm? :
> > > > User hits the SWT.INSERT key on the diagram
> > > > The insert key is received and a command is created and executed to
> > create
> > > a
> > > > new model element
> > > > Problem -> Within that command I'd like to position the new figure
in
> > the
> > > > center of the diagram. My problem is though that I've created the
new
> > > model
> > > > element and I know that it's first listener is the EditPart I need,
> but
> > > > casting that first listener to an EditPart violates MVC. How can I
> get
> > > the
> > > > figure created by the step above and position it without violating
> MVC?
> > > >
> > > > Thanks!
> > > >
> > > > Patrick
> > > >
> > > >
> > >
> > >
> >
> >
>
>
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