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-rw-r--r--grc/src/gui/StateCache.py92
1 files changed, 0 insertions, 92 deletions
diff --git a/grc/src/gui/StateCache.py b/grc/src/gui/StateCache.py
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index 04b18b18a..000000000
--- a/grc/src/gui/StateCache.py
+++ /dev/null
@@ -1,92 +0,0 @@
-"""
-Copyright 2007 Free Software Foundation, Inc.
-This file is part of GNU Radio
-
-GNU Radio Companion is free software; you can redistribute it and/or
-modify it under the terms of the GNU General Public License
-as published by the Free Software Foundation; either version 2
-of the License, or (at your option) any later version.
-
-GNU Radio Companion is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
-"""
-
-from Actions import FLOW_GRAPH_UNDO, FLOW_GRAPH_REDO, get_action_from_name
-from Constants import STATE_CACHE_SIZE
-
-class StateCache(object):
- """
- The state cache is an interface to a list to record data/states and to revert to previous states.
- States are recorded into the list in a circular fassion by using an index for the current state,
- and counters for the range where states are stored.
- """
-
- def __init__(self, initial_state):
- """
- StateCache constructor.
- @param initial_state the intial state (nested data)
- """
- self.states = [None] * STATE_CACHE_SIZE #fill states
- self.current_state_index = 0
- self.num_prev_states = 0
- self.num_next_states = 0
- self.states[0] = initial_state
- self.update_actions()
-
- def save_new_state(self, state):
- """
- Save a new state.
- Place the new state at the next index and add one to the number of previous states.
- @param state the new state
- """
- self.current_state_index = (self.current_state_index + 1)%STATE_CACHE_SIZE
- self.states[self.current_state_index] = state
- self.num_prev_states = self.num_prev_states + 1
- if self.num_prev_states == STATE_CACHE_SIZE: self.num_prev_states = STATE_CACHE_SIZE - 1
- self.num_next_states = 0
- self.update_actions()
-
- def get_current_state(self):
- """
- Get the state at the current index.
- @return the current state (nested data)
- """
- self.update_actions()
- return self.states[self.current_state_index]
-
- def get_prev_state(self):
- """
- Get the previous state and decrement the current index.
- @return the previous state or None
- """
- if self.num_prev_states > 0:
- self.current_state_index = (self.current_state_index + STATE_CACHE_SIZE -1)%STATE_CACHE_SIZE
- self.num_next_states = self.num_next_states + 1
- self.num_prev_states = self.num_prev_states - 1
- return self.get_current_state()
- return None
-
- def get_next_state(self):
- """
- Get the nest state and increment the current index.
- @return the next state or None
- """
- if self.num_next_states > 0:
- self.current_state_index = (self.current_state_index + 1)%STATE_CACHE_SIZE
- self.num_next_states = self.num_next_states - 1
- self.num_prev_states = self.num_prev_states + 1
- return self.get_current_state()
- return None
-
- def update_actions(self):
- """
- Update the undo and redo actions based on the number of next and prev states.
- """
- get_action_from_name(FLOW_GRAPH_REDO).set_sensitive(self.num_next_states != 0)
- get_action_from_name(FLOW_GRAPH_UNDO).set_sensitive(self.num_prev_states != 0)