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"""
Tabs management module
Provide a class holding the current tabs of the application.
Supported list modification operations:
- Appending a tab
- Deleting a tab (and going back to the previous one)
- Inserting a tab from a position to another
- Replacing the whole tab list with another (used for rearranging the
list from outside)
This class holds a cursor to the current tab, which allows:
- Going left (prev()) or right (next()) in the list, cycling
- Getting a reference to the current tab
- Setting the current tab by index or reference
It supports the poezio "gap tab" concept, aka empty tabs taking a space in the
tab list in order to avoid shifting the tab numbers when closing a tab.
Example tab list: [0|1|2|3|4]
We then close the tab 3: [0|1|2|4]
The tab has been closed and replaced with a "gap tab", which the user cannot
switch to, but which avoids shifting numbers (in the case above, the list would
have become [0|1|2|3], with the tab "4" renumbered to "3" if gap tabs are
disabled.
"""
from typing import List, Dict, Type, Optional, Union
from collections import defaultdict
from poezio import tabs
class Tabs:
"""
Tab list class
"""
__slots__ = [
'_current_index', '_current_tab', '_tabs', '_tab_types', '_tab_names',
'_previous_tab'
]
def __init__(self):
"""
Initialize the Tab List. Even though the list is initially
empty, all methods are only valid once append() has been called
once. Otherwise, mayhem is expected.
"""
# cursor
self._current_index: int = 0
self._previous_tab: Optional[tabs.Tab] = None
self._current_tab: Optional[tabs.Tab] = None
self._tabs: List[tabs.Tab] = []
self._tab_types: Dict[Type[tabs.Tab], List[tabs.Tab]] = defaultdict(
list)
self._tab_names: Dict[str, tabs.Tab] = dict()
def __len__(self):
return len(self._tabs)
def __iter__(self):
return iter(self._tabs)
def __getitem__(self, index: Union[int, str]):
if isinstance(index, int):
return self._tabs[index]
return self.by_name(index)
def first(self) -> tabs.Tab:
"""Return the Roster tab"""
return self._tabs[0]
@property
def current_index(self) -> int:
"""Current tab index"""
return self._current_index
def set_current_index(self, value: int) -> bool:
"""Set the current tab index"""
if 0 <= value < len(self._tabs):
tab = self._tabs[value]
if not isinstance(tab, tabs.GapTab):
self._store_previous()
self._current_index = tab.nb
self._current_tab = tab
return True
return False
@property
def current_tab(self) -> Optional[tabs.Tab]:
"""Current tab"""
return self._current_tab
def set_current_tab(self, tab: tabs.Tab) -> bool:
"""Set the current tab"""
if (not isinstance(tab, tabs.GapTab)
and 0 <= tab.nb < len(self._tabs)):
self._store_previous()
self._current_index = tab.nb
self._current_tab = tab
return True
return False
def get_tabs(self) -> List[tabs.Tab]:
"""Return the tab list"""
return self._tabs
def by_name(self, name: str) -> tabs.Tab:
"""Get a tab with a specific name"""
return self._tab_names.get(name)
def by_class(self, cls: Type[tabs.Tab]) -> List[tabs.Tab]:
"""Get all the tabs of a class"""
return self._tab_types.get(cls, [])
def find_match(self, name: str) -> Optional[tabs.Tab]:
"""Get a tab using extended matching (tab.matching_name())"""
def transform(tab_index):
"""Wrap the value of the range around the current index"""
return (tab_index + self._current_index + 1) % len(self._tabs)
for i in map(transform, range(len(self._tabs) - 1)):
for tab_name in self._tabs[i].matching_names():
if tab_name[1] and name in tab_name[1].lower():
return self._tabs[i]
return None
def by_name_and_class(self, name: str,
cls: Type[tabs.Tab]) -> Optional[tabs.Tab]:
"""Get a tab with its name and class"""
cls_tabs = self._tab_types.get(cls, [])
for tab in cls_tabs:
if tab.name == name:
return tab
return None
def _rebuild(self):
self._tab_types = defaultdict(list)
self._tab_names = dict()
for tab in self._tabs:
self._tab_types[type(tab)].append(tab)
self._tab_names[tab.name] = tab
self._update_numbers()
def replace_tabs(self, new_tabs: List[tabs.Tab]):
"""
Replace the current tab list with another, and
rebuild the mappings.
"""
self._tabs = new_tabs
self._rebuild()
current_tab = self.current_tab
try:
idx = self._tabs.index(current_tab)
self._current_index = idx
except ValueError:
self._current_index = 0
self._current_tab = self._tabs[0]
def _inc_cursor(self):
self._current_index += 1
if self._current_index >= len(self._tabs):
self._current_index = 0
self._current_tab = self._tabs[self._current_index]
def _dec_cursor(self):
self._current_index -= 1
if self._current_index < 0:
self._current_index = len(self._tabs) - 1
self._current_tab = self._tabs[self._current_index]
def _store_previous(self):
self._previous_tab = self._current_tab
def next(self):
"""Go to the right of the tab list (circular)"""
self._store_previous()
self._inc_cursor()
while isinstance(self.current_tab, tabs.GapTab):
self._inc_cursor()
def prev(self):
"""Go to the left of the tab list (circular)"""
self._store_previous()
self._dec_cursor()
while isinstance(self.current_tab, tabs.GapTab):
self._dec_cursor()
def append(self, tab: tabs.Tab):
"""
Add a tab to the list
"""
if not self._tabs:
tab.nb = 0
self._current_tab = tab
else:
tab.nb = self._tabs[-1].nb + 1
self._tabs.append(tab)
self._tab_types[type(tab)].append(tab)
self._tab_names[tab.name] = tab
def delete(self, tab: tabs.Tab, gap=False):
"""Remove a tab"""
if isinstance(tab, tabs.RosterInfoTab):
return
if gap:
self._tabs[tab.nb] = tabs.GapTab(None)
else:
self._tabs.remove(tab)
is_current = tab is self.current_tab
self._tab_types[type(tab)].remove(tab)
del self._tab_names[tab.name]
self._collect_trailing_gaptabs()
self._update_numbers()
if is_current:
self._restore_previous_tab()
if tab is self._previous_tab:
self._previous_tab = None
self._validate_current_index()
def _restore_previous_tab(self):
if self._previous_tab:
if not self.set_current_tab(self._previous_tab):
self.set_current_index(0)
def _validate_current_index(self):
if not 0 <= self._current_index < len(
self._tabs) or not self.current_tab:
self.prev()
def _collect_trailing_gaptabs(self):
"""Remove trailing gap tabs if any"""
i = len(self._tabs) - 1
while isinstance(self._tabs[i], tabs.GapTab):
self._tabs.pop()
i -= 1
def _update_numbers(self):
for i, tab in enumerate(self._tabs):
tab.nb = i
# Moving tabs around #
def update_gaps(self, enable_gaps: bool):
"""
Remove the present gaps from the list if enable_gaps is False.
"""
if not enable_gaps:
self._tabs = [tab for tab in self._tabs if tab]
self._update_numbers()
def _insert_nogaps(self, old_pos: int, new_pos: int) -> bool:
"""
Move tabs without creating gaps
old_pos: old position of the tab
new_pos: desired position of the tab
"""
tab = self._tabs[old_pos]
if new_pos < old_pos:
self._tabs.pop(old_pos)
self._tabs.insert(new_pos, tab)
elif new_pos > old_pos:
self._tabs.insert(new_pos, tab)
self._tabs.remove(tab)
else:
return False
return True
def _insert_gaps(self, old_pos: int, new_pos: int) -> bool:
"""
Move tabs and create gaps in the eventual remaining space
old_pos: old position of the tab
new_pos: desired position of the tab
"""
tab = self._tabs[old_pos]
target = None if new_pos >= len(self._tabs) else self._tabs[new_pos]
if not target:
if new_pos < len(self._tabs):
old_tab = self._tabs[old_pos]
self._tabs[new_pos], self._tabs[
old_pos] = old_tab, tabs.GapTab(self)
else:
self._tabs.append(self._tabs[old_pos])
self._tabs[old_pos] = tabs.GapTab(self)
else:
if new_pos > old_pos:
self._tabs.insert(new_pos, tab)
self._tabs[old_pos] = tabs.GapTab(self)
elif new_pos < old_pos:
self._tabs[old_pos] = tabs.GapTab(self)
self._tabs.insert(new_pos, tab)
else:
return False
i = self._tabs.index(tab)
done = False
# Remove the first Gap on the right in the list
# in order to prevent global shifts when there is empty space
while not done:
i += 1
if i >= len(self._tabs):
done = True
elif not self._tabs[i]:
self._tabs.pop(i)
done = True
self._collect_trailing_gaptabs()
return True
def insert_tab(self, old_pos: int, new_pos=99999, gaps=False) -> bool:
"""
Insert a tab at a position, changing the number of the following tabs
returns False if it could not move the tab, True otherwise
"""
if (old_pos <= 0 or old_pos >= len(self._tabs) or new_pos <= 0
or new_pos == old_pos or not self._tabs[old_pos]):
return False
if gaps:
result = self._insert_gaps(old_pos, new_pos)
else:
result = self._insert_nogaps(old_pos, new_pos)
self._update_numbers()
return result
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