def _setGridSize(self, grid_size):
n_columns, n_rows = grid_size
self.removeAllChildren()
for row_n in xrange(n_rows):
row_size = (n_columns * self.cell_size[0], self.cell_size[1])
row = pychan.HBox(min_size=row_size, max_size=row_size, padding=self.padding)
row.border_size = 1
row.opaque = 0
for column_n in xrange(n_columns):
index = row_n * n_columns + column_n
slot = Slot(min_size=(self.cell_size), max_size=(self.cell_size))
slot.border_size = 1
slot.name = "Slot_%d" % index
slot.index = index
slot.image = None
slot.size = self.cell_size
row.addChild(slot)
self.addChild(row)
self.min_size = ((n_columns * self.cell_size[0]) + 2, (n_rows * self.cell_size[1]) + 2)
self.max_size = self.min_size
