Cutlery/calibre
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This commit is contained in:
Kovid Goyal 2014-09-21 17:25:42 +05:30
parent 0c1f713687
commit 8e27bf42a4
1 changed files with 8 additions and 3 deletions
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11
src/calibre/gui2/viewer/ui.py
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@ -120,21 +120,25 @@ class History(list): # {{{
if self.action_forward is not None: if self.action_forward is not None:
self.action_forward.setDisabled(self.forward_pos is None) self.action_forward.setDisabled(self.forward_pos is None)
def back(self, from_pos): def back(self, item_when_clicked):
# Back clicked # Back clicked
if self.back_pos is None: if self.back_pos is None:
return None return None
item = self[self.back_pos] item = self[self.back_pos]
self.forward_pos = self.back_pos+1 self.forward_pos = self.back_pos+1
if self.forward_pos >= len(self): if self.forward_pos >= len(self):
self.append(from_pos) # We are at the head of the stack, append item to the stack so that
# clicking forward again will take us to where we were when we
# clicked back
self.append(item_when_clicked)
self.forward_pos = len(self) - 1 self.forward_pos = len(self) - 1
self.insert_pos = self.forward_pos self.insert_pos = self.forward_pos
self.back_pos = None if self.back_pos == 0 else self.back_pos - 1 self.back_pos = None if self.back_pos == 0 else self.back_pos - 1
self.set_actions() self.set_actions()
return item return item
def forward(self, from_pos): def forward(self, item_when_clicked):
# Forward clicked
if self.forward_pos is None: if self.forward_pos is None:
return None return None
item = self[self.forward_pos] item = self[self.forward_pos]
@ -147,6 +151,7 @@ class History(list): # {{{
return item return item
def add(self, item): def add(self, item):
# Link clicked
self[self.insert_pos:] = [] self[self.insert_pos:] = []
while self.insert_pos > 0 and self[self.insert_pos-1] == item: while self.insert_pos > 0 and self[self.insert_pos-1] == item:
self.insert_pos -= 1 self.insert_pos -= 1