-ID_BLACKLIST = ['self', 'options', 'gr', 'blks2', 'wxgui', 'wx', 'math', 'forms', 'firdes'] + dir(builtins)

- # Hide empty grid positions

- if self.key in ('grid_pos', 'notebook') and not self.get_value():

- return 'part'

- # Grid Position Type

- #########################

- elif t == 'grid_pos':

- if not v:

- # Allow for empty grid pos

- return ''

- e = self.parent_flowgraph.evaluate(v)

- if not isinstance(e, (list, tuple)) or len(e) != 4 or not all([isinstance(ei, int) for ei in e]):

- raise Exception('A grid position must be a list of 4 integers.')

- row, col, row_span, col_span = e

- # Check row, col

- if row < 0 or col < 0:

- raise Exception('Row and column must be non-negative.')

- # Check row span, col span

- if row_span <= 0 or col_span <= 0:

- raise Exception('Row and column span must be greater than zero.')

- # Get hostage cell parent

- try:

- my_parent = self.parent.get_param('notebook').evaluate()

- except:

- my_parent = ''

- # Calculate hostage cells

- for r in range(row_span):

- for c in range(col_span):

- self._hostage_cells.append((my_parent, (row+r, col+c)))

- # Avoid collisions

- params = [p for p in self.get_all_params('grid_pos') if p is not self]

- for param in params:

- for parent, cell in param._hostage_cells:

- if (parent, cell) in self._hostage_cells:

- raise Exception('Another graphical element is using parent "{}", cell "{}".'.format(str(parent), str(cell)))

- return e

- #########################

- # Notebook Page Type

- #########################

- elif t == 'notebook':

- if not v:

- # Allow for empty notebook

- return ''

-

- # Get a list of all notebooks

- notebook_blocks = [b for b in self.parent_flowgraph.get_enabled_blocks() if b.key == 'notebook']

- # Check for notebook param syntax

- try:

- notebook_id, page_index = map(str.strip, v.split(','))

- except:

- raise Exception('Bad notebook page format.')

- # Check that the notebook id is valid

- try:

- notebook_block = [b for b in notebook_blocks if b.get_id() == notebook_id][0]

- except:

- raise Exception('Notebook id "{}" is not an existing notebook id.'.format(notebook_id))

-

- # Check that page index exists

- if int(page_index) not in range(len(notebook_block.get_param('labels').evaluate())):

- raise Exception('Page index "{}" is not a valid index number.'.format(page_index))

- return notebook_id, page_index

-

- #########################