Selection View

The Selection View is a standard Simantics view, which shows tabbed configuration views about the current workbench selection.

Quick Summary

• To use the standard selection view facilities you need to make your WorkbenchPart adaptable to StandardPropertyPage.
• StandardPropertyPage will create StandardProperties as the property page control and use StandardSelectionProcessor to process all incoming selections.

Selection View

The Selection View is contributed in org.simantics.browsing.ui.platform/plugin.xml. The selection view implementation is in class org.simantics.browsing.ui.platform.PropertyPageView.

Selection View displays content for the workbench selection.

Selection View listens to the active workbench part and tries to obtain org.simantics.ui.workbench.IPropertyPage via IAdaptable.getAdapter for displaying selections from the part.

Most Simantics workbench part implementations adapt into the standard property page implementation described next.

Standard property page

The standard property page (StandardPropertyPage) displays a tab folder (StandardProperties), which contains a number of tabs contributed by a set of selection processors (SelectionProcessor).

Selection processing

<syntaxhighlight lang="java"> /**

* A selection processor is an interface for encapsulating the conversion from a
* UI selection into a collection of input objects. Minimally a selection
* processor must simply transfer the incoming selection's contents into a
* collection. The point of having this interface is to allow contribution-based
* preprocessing of UI selections into proper domain-specific model objects that
* the domain-specific UI components can take as their inputs.
* 

*

* This interface is used in conjunction with UI components that are meant to * react to external inputs/UI selections. A tabbed selection view is an example * of such a UI component. One or more tabs are created for each preprocessed * input object. A selection processor in a tabbed property table is the party * that decides how to process/adapt a new workbench selection before sending it * on to property contributors for resolving all potential property tab * contributors. * * @author Tuukka Lehtonen * * @param * @param */ public interface SelectionProcessor<S, B> { /** * @param selection the incoming selection to process * @param backend for providing back-end access to the processor * @return an ordered set of * org.simantics.browsing.ui.swt.ComparableTabContributor * instances representing the property tabs to be contributed to the * selection view. The processor must not return null, * return an empty collection instead. */ Collection<?> process(S selection, B backend); } </syntaxhighlight>

• Selection is the workbench selection.
• Backend is normally ReadGraph (could be something else if custom property pages are used).
• Selection processors are contributed by:
  1. Extending StandardPropertyPage and overriding method getSelectionProcessor
  2. Constructing StandardPropertyPage with a set of browse contexts for which selection processors can be contributed via extension point org.simantics.browsing.ui.common.selectionProcessorBinding
• The obtained set of ComparableTabContributors are sorted and used to create tabs for the tabbed folder.

A modelled implementation of the SelectionProcessor interface is described next.

Modelled Selection Processor (org.simantics.selectionview.StandardSelectionProcessor)

The implementation of modelled selection processor does the following procedure:

1. Try to get a model resource from the workbench selection.

<syntaxhighlight lang="java"> private Resource getModel(ReadGraph graph, Object selection) throws DatabaseException {

   Variable variable = ISelectionUtils.filterSingleSelection(selection, Variable.class);
   if (variable != null)
       return Variables.getModel(graph, variable);

   Resource model = ISelectionUtils.getSinglePossibleKey(selection,
           SelectionHints.KEY_MODEL, Resource.class);
   if (model == null) {
       Resource r = ISelectionUtils.getSinglePossibleKey(selection,
               SelectionHints.KEY_MAIN, Resource.class);
       if (r != null)
           model = graph.sync(new PossibleModel(r));
   }
   return model != null
           && graph.isInstanceOf(model, SimulationResource.getInstance(graph).Model)
           ? model
           : null;

} </syntaxhighlight>

2. Seek all instances of http://www.simantics.org/SelectionView-0.0/TabContribution from model dependencies and adapt (ReadGraph.adapt) them to org.simantics.selectionview.TabContribution.

<syntaxhighlight lang="python"> SEL.VariableTabContribution <T SEL.TabContribution

 >-- SEL.VariableTabContribution.HasTest <R L0.DependsOn
 >-- SEL.VariableTabContribution.HasView <R L0.DependsOn
 >-- SEL.VariableTabContribution.HasPriority <R L0.DependsOn

SEL.TypedVariableTabContribution <T SEL.VariableTabContribution

 >-- SEL.TypedVariableTabContribution.HasType <R L0.DependsOn

</syntaxhighlight>

<syntaxhighlight lang="java"> public interface TabContribution<T> {

   void contribute(ReadGraph graph, T selection, Collection<ComparableTabContributor> result)
           throws DatabaseException;	

} </syntaxhighlight>

(SEL.VariableTabContribution.HasView refers to a Modelled View configuration for describing the contents of the tab.)

3. Seek all instances of http://www.simantics.org/SelectionView-0.0/SelectionTransformation (which are also L0.Function) and apply them (org.simantics.db.common.utils.Functions#exec) as long as needed to obtain a closure of inputs, i.e. as long as new inputs are generated from existing ones.
4. Feed all inputs to the found TabContributions to obtain a set of tabs.

Tab implementation

The standard way of implementing a tab is a Simantics Modelled View.

Generic configurations for modelled tabs can be found in the ontology http://www.simantics.org/SelectionViewUI-1.0.

The standard modelled property tab is http://www.simantics.org/SelectionViewUI-1.0/StandardProperties

SEL.StandardPropertiesBase <T VIEW.Explorer
  @L0.assert VIEW.Control.layoutData
    _ : VIEW.GridLayout.GridData
      VIEW.GridLayout.GridData.horizontalGrab true
      VIEW.GridLayout.GridData.verticalGrab true
  @L0.assert VIEW.Control.style 
    _ : VIEW.Control.Style
      VIEW.Control.Style.HasConstant VIEW.Control.Style.Constant.Multi
      VIEW.Control.Style.HasConstant VIEW.Control.Style.Constant.FullSelection
  @L0.assert VIEW.Explorer.columns 
    _ : VIEW.Explorer.ColumnList
      @L0.list
        SEL.PropertyColumn
        SEL.ValueColumn
        SEL.UnitColumn
  @L0.assert VIEW.Explorer.input MOD.Functions.singleVariableSelection
  @L0.assert VIEW.Explorer.browseContext
    _ : VIEW.ResourceURI
      VIEW.ResourceURI.HasResource SEL.StandardPropertiesBase.BrowseContext : SEL.StandardProperties.BrowseContextStandardChildren

SEL.StandardProperties : SEL.StandardPropertiesBase

where input is obtained from modelled view runtime state

    @SCLValue(type = "ReadGraph -> Resource -> Variable -> Variable")
    public static Variable singleVariableSelection(ReadGraph graph, Resource resource, Variable context) throws DatabaseException {
    	return ScenegraphLoaderUtils.getVariableSelection(graph, context);
    }

and browsing rules are defined by

SEL.StandardProperties.BrowseContextStandardChildren <T SEL.StandardProperties.BrowseContextWithoutChildren
  @L0.assert VP.BrowseContext.HasChildContribution 
    _ : VP.ChildContribution
      VP.ChildContribution.HasParentNodeType MOD.ModelingBrowseContext.Variable
      VP.ChildContribution.HasChildNodeType MOD.ModelingBrowseContext.Variable
      VP.ChildContribution.HasRule _ : MOD.ModelingBrowseContext.VariablePropertyRule
        MOD.ModelingBrowseContext.VariablePropertyRule.RequireProperty "HasStandardPropertyInfo"
  @L0.assert VP.BrowseContext.HasChildContribution 
    _ : VP.ChildContribution
      VP.ChildContribution.HasParentNodeType MOD.ModelingBrowseContext.Variable
      VP.ChildContribution.HasChildNodeType SEL.CategoryNode
      VP.ChildContribution.HasRule _ : SEL.VariablePropertyCategoryRule

SEL.StandardProperties.BrowseContextWithoutChildren <T VP.BrowseContext
  @L0.assert VP.BrowseContext.HasVisualsContribution
    _ : VP.VisualsContribution
      VP.VisualsContribution.HasNodeType MOD.ModelingBrowseContext.Variable
      VP.VisualsContribution.HasRule SEL.VariablePropertyLabelRule
  @L0.assert VP.BrowseContext.HasVisualsContribution
    _ : VP.VisualsContribution
      VP.VisualsContribution.HasNodeType SEL.CategoryNode
      VP.VisualsContribution.HasRule SEL.CategoryNodeLabelRule
  @L0.assert VP.BrowseContext.HasVisualsContribution
    _ : VP.VisualsContribution
      VP.VisualsContribution.HasNodeType MOD.ModelingBrowseContext.Variable
      VP.VisualsContribution.HasRule SEL.StandardPropertySorterRule
  @L0.assert VP.BrowseContext.HasVisualsContribution
    _ : VP.VisualsContribution
      VP.VisualsContribution.HasNodeType MOD.ModelingBrowseContext.Variable
      VP.VisualsContribution.HasRule SEL.VariablePropertyModifierRule
  @L0.assert VP.BrowseContext.HasVisualsContribution
    _ : VP.VisualsContribution
      VP.VisualsContribution.HasNodeType MOD.ModelingBrowseContext.Variable
      VP.VisualsContribution.HasRule SEL.VariableDecorationRule
  @L0.assert VP.BrowseContext.HasVisualsContribution
    _ : VP.VisualsContribution
      VP.VisualsContribution.HasNodeType SEL.CategoryNode
      VP.VisualsContribution.HasRule SEL.CategoryDecorationRule

The rules of the standard browse context are as follows:

• MOD.ModelingBrowseContext.VariablePropertyRule returns all properties (Variable.browseProperties) such that
  • All results contain all properties defined by VariablePropertyRule.RequireProperty
• SEL.VariablePropertyCategoryRule returns a set of categories collected from all suitable properties (as above)
  • categories are identified by
    • var#HasStandardPropertyInfo#CategoryName
    • var#HasStandardPropertyInfo#CategorySortingName
  • hidden categories are not shown
    • see var#HasStandardPropertyInfo#IsHidden
• SEL.VariablePropertyLabelRule collects a String->String map by searching properties var where
  • key is the value of (var#HasDisplayColumn)
  • value is the (Bindings.STRING) value of var
• SEL.CategoryNodeLabelRule returns the map "HasDisplayProperty" -> ((CategoryNode)content).getName()
• SEL.StandardPropertySorterRule sorts properties and categories by sorting name where sorting name is
  • (p#SortingName) or if absent (p#HasDisplayProperty) for a variable p
  • ((CategoryNode)content).getSortingName() for categories
• SEL.VariablePropertyModifierRule returns org.simantics.browsing.ui.content.Labeler.Modifier by
  • finding the column property (by var#HasDisplayColumn)
  • trying to obtain a custom modifier (var#HasCustomModifier)
  • trying to obtain an enumeration modifier by listing (var#HasEnumerationValues) and returning org.simantics.browsing.ui.graph.impl.EnumerationVariableModifier3
  • returning org.simantics.browsing.ui.model.modifiers.VariableModifier2
• SEL.VariableDecorationRule offsets the property name column of properties by one
• SEL.CategoryDecorationRule displays categories as bold

The standard implementation can be customised by e.g.

• Introducing more columns
• Applying property filtering (RequiresProperty)
• Adding decorations

Some other notable points

• Modifier uses the property 'HasInputValidator' for getting a validator
• Modifier writes with Bindings.STRING into the label property.
• The labels may apply transformations such as unit conversion or formatting i.e. they can not be used for obtaining raw property data.

Selection View Title

By default the selection view title is set to Selection. However it is possible for tab contributions to customize the title text. On the low-level customization happens through the org.simantics.selectionview.IPropertyTab2 interface which tab contributions can implement.

public interface IPropertyTab2 extends IPropertyTab {

    /**
     * @param updateCallback a callback that <em>can be</em> invoked by
     *        getPartName if it wishes to change the part name. If the page does
     *        not wish to change the part name, it does not have to invoke the
     *        updateCallback. A <code>null</code> value indicates that the part
     *        name should be returned to its default value. The method should
     *        use the selection received by
     *        {@link #setInput(org.simantics.db.management.ISessionContext, ISelection, boolean)}
     *        as input for constructing the part title.
     */
    void updatePartName(Callback<String> updateCallback);

}

Contributing custom title logic is not yet possible through modelling, only by implementing your own custom org.simantics.selectionview.PropertyTabContributor, e.g. by customizing org.simantics.selectionview.ModelledTabContributor or org.simantics.selectionview.PropertyTabContributorImpl.

Future developments

Some generic Variable properties should be used in rules. These properties include

• #classifications
• #valid
• #validator
• #expression
• #required
• #default
• #readOnly

The Variable model includes a generic model for connections, which should also be supported in the standard properties

Selection view title logic modelling shall be added.