def _get_row(self, row, autoadjust=False, require=True):
"""Return the row number 'row' from the database as a 'PresentedRow' instance.
Arguments:
row -- row number within the *database select*, starting from 0
autoadjust -- when true, 'row' is decreased by one if it is located
behind an edited *new* row. Also when the 'row', equals to the
number of the currently edited row (whether new or existing), this
edited row is returned.
require -- when true, the requested row must exist, otherwise 'None'
is returned if the given row doesn't exist
"""
edited = self._edited_row
if edited and row == edited.row:
return edited.the_row
elif edited and autoadjust and edited.the_row.new() and row > edited.row:
row_ = row - 1
else:
row_ = row
success, result = db_operation(self._retrieve_row, row_, require=require)
if not success:
self._panic()
return result
def _get_row(self, row, autoadjust=False, require=True):
"""Return the row number 'row' from the database as a 'PresentedRow' instance.
Arguments:
row -- row number within the *database select*, starting from 0
autoadjust -- when true, 'row' is decreased by one if it is located
behind an edited *new* row. Also when the 'row', equals to the
number of the currently edited row (whether new or existing), this
edited row is returned.
require -- when true, the requested row must exist, otherwise 'None'
is returned if the given row doesn't exist
"""
edited = self._edited_row
if edited and row == edited.row:
return edited.the_row
elif edited and autoadjust and edited.the_row.new(
) and row > edited.row:
row_ = row - 1
else:
row_ = row
success, result = db_operation(self._retrieve_row,
row_,
require=require)
if not success:
self._panic()
return result
def rewind(self, position=None):
"""Přesuň datové ukazovátko na začátek dat.
Jestliže 'position' není 'None', přesuň ukazovátko na 'position'.
"""
if self._current_row is None:
return
if position is None:
self._data.rewind()
self._cache = self._DisplayCache()
self._current_row = None
elif position < -1 or position >= self.number_of_rows() - 1:
pass
else:
row = position
success, result = db_operation(self._retrieve_row, row)
if not success:
self._panic()
self._presented_row.set_row(result)
self._current_row = self._CurrentRow(row, copy.copy(self._presented_row))
def rewind(self, position=None):
"""Přesuň datové ukazovátko na začátek dat.
Jestliže 'position' není 'None', přesuň ukazovátko na 'position'.
"""
if self._current_row is None:
return
if position is None:
self._data.rewind()
self._cache = self._DisplayCache()
self._current_row = None
elif position < -1 or position >= self.number_of_rows() - 1:
pass
else:
row = position
success, result = db_operation(self._retrieve_row, row)
if not success:
self._panic()
self._presented_row.set_row(result)
self._current_row = self._CurrentRow(
row, copy.copy(self._presented_row))