regards,
Larry
On 8/29/06,
Stefan Steiniger <[EMAIL PROTECTED]> wrote:
Hei Juliana,
i guess your idea is the best, to add a property to the Layer class
(Layerable?)
and then change the selection tool /method
I think we should apply this to the core as well ... if e.g.Ugo or Larry
think the same
stefan
Juliana Barros wrote
> Thanks for your help!
> I Think I will change the OpenJump source but I will make a simple
> modification specifically at Layer class and CursorTool.
>
>
> On 8/29/06, * Sunburned Surveyor* <[EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED] >> wrote:
>
> Thanks for the extra information. That helps some!
>
> I'm going to take a stab at this, although there are others on the
> list that may no better than me. I'm still learning OpenJUMP's code
> base.
>
> I think there are two ways to go here.
>
> You can try to change the feature selection and identification tools,
> or you can try to change something about the way layers work.
>
> I think the first option will be easier, but the second option may be
> a more effective solution in the long run.
>
> If we can change the way layers work any future tools will also be
> able to obey our "which layers will work for this tool and which
> layers don't work for this tool" rule.
>
> Unfortunately I think this will involve some changes to OpenJUMP's
> source code. I don't think we can do it with a Plug-In.
>
> Let me give you my intial thoughts. Remember I'm brainstorming
> here. :]
>
> You can create a class named "LayerPermissions". It can track
> information about which layers can be used by OpenJUMP's tools.
> Instead of tracking what is allowed, we should track what isn't
> allowed. That way a tool will only be disabled for a layer if someone
> goes out of there way to make it so.
>
> I imagine our LayerPermissions inteface would have at least these
> two methods:
>
> public void addRestriction(String LayerName, String ToolName)
>
> public void removeRestriction(String LayerName, String ToolName)
>
> These methods would take two parameters. The first would be the name
> of the layer the restriction applied to, while the second would
> identify the tool being restricted.
>
> Some other methods of this interface might be:
>
> public void clearAllRestrictions()
>
> public void clearAllRestrictionsOnLayer(String LayerName)
>
> public void getPermittedLayersForTool(String ToolName)
>
> You could easily design a simple dialog box that showed a list of
> tools and layers and allowed restrictions to be added and removed. You
> could even password protect this dialog box if necessary.
>
> I think we are still going to have to modify the classes for the tools
> themselves. We need to have the tools utilize the informtation
> provided by our LayersPermission class to modify their behavior.
>
> For example, we would need to "filter out" features restricted layers
> when the feature selection tool is used. In the case of the identity
> tool, we would need to check for permission before displaying the
> information on a feature selected for identification by the user.
>
> I'd want to display some sort of message to the user explaining why
> the tool didn't work. I wouldn't just want to turn the tool off for
> some layers. (I'm picturing my Dad banging his head on the floor
> becuase a tool won't work like it is supposed to.) :]
>
> There may be a much simpler solution. Stefan and Ugo might have some
> ideas. Honestly, I haven't looked extensively at the layering system
> source code, or at the source code for the feature selection and
> feature identification tools.
>
> If the users don't need to see the features, you can just turn the
> layers off!
>
> Let me know if you decide to go forward and I'll see if I can help
> answer some questions. If we come up with a functional layers
> permission system we may want to integrate it into the core.
>
> The Sunburned Surveyor
> On 8/29/06, Juliana Barros < [EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>> wrote:
> > Hi Sunburned,
> >
> > The first option! "Users can't select features from this layer
> with the
> > feature
> > selection or identification tools".
> >
> > I´m looking for a programattic technique.
> >
> > Thanks,
> >
> > Juliana
> >
> >
> > On 8/29/06, Sunburned Surveyor <[EMAIL PROTECTED]
> <mailto: [EMAIL PROTECTED]>> wrote:
> > >
> > Juliana,
> >
> > When you say "unselectable", which of the following do you mean?:
> >
> > [1] Users can't select features from this layer with the feature
> > selection or identification tools.
> >
> > [2] Users can't make this layer editable?
> >
> > [3] Users aren't allowed make this layer not paint/paint on the
> layer view.
> >
> > [4] Something else I haven't thought of...
> >
> > Also, are you looking for a programattic technique, or a
> configuration
> > setting built into OpenJUMP? (There isn't a built-in setting that I
> > know of, but we can probably help you with some code...)
> >
> > The Sunburned Surveyor
> >
> > On 8/29/06, Juliana Barros <[EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>> wrote:
> > > Hi,
> > >
> > > Anyone knows how can I configure a Layer to be unselectable?
> > >
> > > Thanks,
> > >
> > > Juliana
> > >
> > >
> >
> -------------------------------------------------------------------------
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> -------------------------------------------------------------------------
>
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