The selection view now works. Functions can return a dataset.Selection object which will be stored in the selection list.

workflows/test_workflow.py

@@ -19,6 +19,7 @@ class TestWorkflow (workflow.Workflow):
         load.add_function(CelFileImportFunction())
         load.add_function(TestDataFunction())
         load.add_function(DatasetLoadFunction())
+        load.add_function(SelectFunction())
         self.add_stage(load)
 
         preproc = workflow.Stage('preprocess', 'Preprocessing')
@@ -116,6 +117,17 @@ class TestDataFunction(workflow.Function):
         ds_scatter = plots.ScatterMarkerPlot(ds, ds, 'rows_0', 'rows_0', '0_1', '0_2')
         return [X, ds, plots.SinePlot(), p, ds_plot, ds_scatter,p2]
 
+class SelectFunction(workflow.Function):
+    def __init__(self):
+        workflow.Function.__init__(self, 'select', 'Select')
+
+    def run(self, data):
+        s = dataset.Selection('Arbitrary selection')
+        s.select('rows', ['0_1', '0_2'])
+        print s['rows']
+        print s.dims()
+        return [s]
+
 class DatasetLog(workflow.Function):
     def __init__(self):
         workflow.Function.__init__(self, 'log', 'Log')