Examples of org.eclipse.ui.SelectionEnabler

org.eclipse.ui.SelectionEnabler
Determines the enablement status given a selection. This calculation is done based on the definition of the enablesFor attribute, enablement element, and the selection element found in the IConfigurationElement provided.
This class can be instantiated by clients. It is not intended to be extended.
@since 3.0Note: The dependency on org.eclipse.jface.text for ITextSelection must be severed It may be possible to do with IActionFilter generic workbench registers IActionFilter for "size" property against IStructuredSelection workbench text registers IActionFilter for "size" property against ITextSelection code here: sel.getAdapter(IActionFilter.class) As an interim solution, use reflection to access selections implementing ITextSelection

          element, actionId);
      return; // There is nothing to be done.
    }


    // Read the enablesFor attribute, and enablement and selection elements.
    SelectionEnabler enabler = null;
    if (element.getAttribute(ATT_ENABLES_FOR) != null) {
      enabler = new SelectionEnabler(element);
    } else {
      IConfigurationElement[] kids = element.getChildren(TAG_ENABLEMENT);
      if (kids.length > 0) {
        enabler = new SelectionEnabler(element);
      }
    }
    final Expression enabledWhenExpression;
    if (enabler == null) {
      enabledWhenExpression = null;

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        pluginId = configElement.getNamespace();


        // Read enablement declaration.
        if (configElement.getAttribute(IWorkbenchRegistryConstants.ATT_ENABLES_FOR) != null) {
            enabler = new SelectionEnabler(configElement);
        } else {
      IConfigurationElement[] kids = configElement
          .getChildren(IWorkbenchRegistryConstants.TAG_ENABLEMENT);
      IConfigurationElement[] kids2 = configElement
          .getChildren(IWorkbenchRegistryConstants.TAG_SELECTION);
      if (kids.length > 0 || kids2.length>0) {
        enabler = new SelectionEnabler(configElement);
      }
    }


        // Give enabler or delegate a chance to adjust enable state
        selectionChanged(new StructuredSelection());

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    /**
     * Answer self's action enabler, creating it first iff necessary
     */
    protected SelectionEnabler getSelectionEnabler() {
        if (selectionEnabler == null) {
      selectionEnabler = new SelectionEnabler(configurationElement);
    }


        return selectionEnabler;
    }

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