Selection View

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

Selection View (org.simantics.browsing.ui.platform.PropertyPageView)

The Selection View is contributed in org.simantics.browsing.ui.platform/plugin.xml.

Selection View displays content for the workbench selection.

Selection View listens 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 (org.simantics.selectionview.StandardPropertyPage)

The standard property page displays a tab folder (org.simantics.selectionview.StandardProperties), which contains n tabs contributed by a set of selection processors (org.simantics.selectionview.SelectionProcessor).

Selection processing

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
     *         <code>org.simantics.browsing.ui.swt.ComparableTabContributor</code>
     *         instances representing the property tabs to be contributed to the
     *         selection view. The processor must not return <code>null</code>,
     *         return an empty collection instead.
     */
    Collection<?> process(S selection, B backend);

}

Selection is the workbench selection.

Backend is ReadGraph in most cases (could be something else if custom property pages are used).

Selection processors are contributed by

• Extending StandardPropertyPage and overriding method getSelectionProcessor
• 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:

Try to get a model resource from the workbench selection.

private Resource getModel(ReadGraph graph, Object selection) throws DatabaseException {
		
		Variable variable = ISelectionUtils.filterSingleSelection(selection, Variable.class);
		if(variable != null) {
			return Variables.getModel(graph, variable);
		}
		
		return ISelectionUtils.getSinglePossibleKey(selection, SelectionHints.KEY_MODEL, Resource.class);		
		
	}

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.

public interface TabContribution<T> {

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

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.

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 modelled selection view tabs include

StandardProperties (http://www.simantics.org/SelectionView-0.0/StandardProperties)

• StandardProperties is an Explorer view which expects a single Variable as an input.
• The view has the columns 'Property', 'Value' and 'Unit'
• Tree children for variable v are all properties of v which have a property called HasStandardPropertyInfo
• Column labels for child c are obtained by collecting all properties of c that have a property called DISPLAY_COLUMN
  • The (String) value of DISPLAY_COLUMN property if the column identifier
  • 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.
• The HasStandardPropertyInfo property defines the following attributes of the displayed property
  • Category (Name, SortingName, Visibility)
• Required, Default?