mhm.. it sounds interesting for me too.. even i think i have seen some
similar concept.
but here, the themes were shown only in a different "view".. called
map-view (which avoids a bit confusion).
I see the idea rathe as an add-on.. that means as a concept that is on
the same level as a layer. And most important, that one does not need to
create a theme to show data, i.e. layer is still enough but "theme" if
for those who want to make maps.
i would be interest too what other people do think about this proposal.
stefan
Paul Austin schrieb:
> At the moment the Task frame has two levels, Category and Layer. I would
> like to propose a third Theme.
>
> What is a theme? A theme identifies a sub set of features in a Layer
> which have their own style, a label and you can show/hide the layer.
>
> For feature layers an example would be a building you may have schools
> and churches that are rendered using different symbols. This corresponds
> to the ColorThemingStyle.
>
> For WMS layers you could use themes to represent each layer from the
> server, with the icon being the legend graphic from the server. Here
> when you show/hide a layer it would add or remove that layer from the
> WMS request and update the layer.
>
> To support this we would need to add a new Theme interface to the
> workbench.model, which describes the theme. Different type of Layerable
> would use their own implementations of this interface.
>
> public interface Theme {
> String getLabel();
>
> void setLabel(String label);
>
> BasicStyle getStyle();
>
> void setStyle(BasicStyle style);
>
> boolean isVisible();
>
> void setVisible(boolean visible);
> }
>
> I would also propose a ThemedLayerable interface that would allow you to
> get the themes for the layer, Layerables that support themes would
> implement this interface.
>
> public interface ThemedLayerable extends Layerable {
> public List getThemes();
> }
>
> Would would then need to modify the LayerTreeModel and the
> TreeLayerPanel to support this new kind of item in the tree.
>
> For Layers I would delegate getting the Themes from the Styles, and my
> new FilterTheming style would use this.
>
> I almost have this code ready to checkin, I'll post a diff so that
> people can have a look at what I've done and decide if this is something
> we should add to the core.
>
> Paul
>
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