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# Copyright 2012 Canonical Ltd.
#
# This file is part of u1db.
#
# u1db is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License version 3
# as published by the Free Software Foundation.
#
# u1db 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with u1db. If not, see <http://www.gnu.org/licenses/>.
"""User interface for the u1todo example application."""
from collections import defaultdict
from datetime import datetime
import os
import sys
from PyQt4 import QtGui, QtCore, uic
from u1todo import TodoStore, get_database, extract_tags
import u1db
from u1db.errors import DatabaseDoesNotExist
from u1db.sync import Synchronizer
from u1db.remote.http_target import HTTPSyncTarget
from u1db.remote.http_database import HTTPDatabase
from ubuntuone.platform.credentials import CredentialsManagementTool
class UITask(QtGui.QListWidgetItem):
"""Task list item."""
def __init__(self, task):
super(UITask, self).__init__()
self.task = task
self.setText(self.task.title)
self.setCheckState(
QtCore.Qt.Checked if task.done else QtCore.Qt.Unchecked)
font = self.font()
font.setStrikeOut(task.done)
self.setFont(font)
class Main(QtGui.QMainWindow):
"""Main window of our application."""
def __init__(self, in_memory=False):
super(Main, self).__init__()
uifile = os.path.join(os.path.abspath(os.path.dirname(__file__)),
'u1todo.ui')
uic.loadUi(uifile, self)
self.connect_events()
db = get_database()
self.store = TodoStore(db)
# create or update the indexes if they are not up-to-date
self.store.initialize_db()
self.delete_button.setEnabled(False)
self._tag_docs = defaultdict(list)
self._tag_buttons = {}
self._tag_filter = []
for task in self.store.get_all_tasks():
self.add_task(task)
self.task_edit.clear()
self.task_edit.setFocus()
self.item = None
def connect_events(self):
"""Hook up all the signal handlers."""
self.task_edit.returnPressed.connect(self.update)
self.edit_button.clicked.connect(self.update)
self.delete_button.clicked.connect(self.delete)
self.todo_list.currentRowChanged.connect(self.row_changed)
self.todo_list.itemChanged.connect(self.item_changed)
self.sync_button.clicked.connect(self.synchronize)
def refresh_filter(self):
while len(self.todo_list):
self.todo_list.takeItem(0)
for task in self.store.get_tasks_by_tags(self._tag_filter):
self.add_task(task)
self.item = None
self.task_edit.clear()
def item_changed(self, item):
if item.checkState() == QtCore.Qt.Checked:
item.task.done = True
else:
item.task.done = False
font = item.font()
font.setStrikeOut(item.task.done)
item.setFont(font)
item.setText(item.task.title)
self.store.save_task(item.task)
self.todo_list.setCurrentRow(-1)
self.task_edit.clear()
self.item = None
def update(self):
"""Either add a new task or update an existing one."""
text = unicode(self.task_edit.text(), 'utf-8')
if not text:
return
if self.item is None:
task = self.store.new_task(text, tags=extract_tags(text))
self.add_task(task)
else:
self.update_task_text(text)
self.todo_list.setCurrentRow(-1)
self.task_edit.clear()
self.item = None
def get_ubuntuone_credentials(self):
cmt = CredentialsManagementTool()
return cmt.find_credentials()
def synchronize(self):
self.sync_button.setEnabled(False)
if self.u1_radio.isChecked():
d = self.get_ubuntuone_credentials()
d.addCallback(self._synchronize)
else:
# TODO: add ui for entering creds for non u1 servers.
self._synchronize()
def _synchronize(self, creds=None):
if self.u1_radio.isChecked():
# TODO: not hardcode
target = 'https://u1db.one.ubuntu.com/~/u1todo'
else:
target = self.url_edit.text()
if target.startswith('http://') or target.startswith('https://'):
st = HTTPSyncTarget.connect(target)
oauth_creds = {
'token_key': creds['token'],
'token_secret': creds['token_secret'],
'consumer_key': creds['consumer_key'],
'consumer_secret': creds['consumer_secret']}
if creds:
st.set_oauth_credentials(**oauth_creds)
else:
db = u1db.open(target, create=True)
st = db.get_sync_target()
syncer = Synchronizer(self.store.db, st)
try:
syncer.sync()
except DatabaseDoesNotExist:
# The server does not yet have the database, so create it.
if target.startswith('http://') or target.startswith('https://'):
HTTPDatabase.open_database(
target, create=True, oauth_creds=oauth_creds)
syncer.sync()
self.refresh_filter()
self.last_synced.setText(
'<span style="color:green">%s</span>' % (datetime.now()))
self.sync_button.setEnabled(True)
def delete(self):
"""Delete a todo item."""
item = self.todo_list.takeItem(self.todo_list.currentRow())
self.store.delete_task(item.task)
self.todo_list.setCurrentRow(-1)
if self.todo_list.count() == 0:
self.delete_button.setEnabled(False)
def add_task(self, task):
"""Add a new todo item."""
item = UITask(task)
self.todo_list.addItem(item)
self.delete_button.setEnabled(True)
if not task.tags:
return
for tag in task.tags:
self.add_tag(task.task_id, tag)
def add_tag(self, task_id, tag):
self._tag_docs[tag].append(task_id)
if len(self._tag_docs[tag]) > 1:
return
button = QtGui.QPushButton(tag)
button._u1todo_tag = tag
button.setCheckable(True)
self._tag_buttons[tag] = button
def filter_toggle(checked):
if checked:
self._tag_filter.append(button._u1todo_tag)
else:
self._tag_filter.remove(button._u1todo_tag)
self.refresh_filter()
button.clicked.connect(filter_toggle)
index = sorted(self._tag_buttons.keys()).index(tag)
self.tag_buttons.insertWidget(index, button)
def remove_tag(self, task_id, tag):
self._tag_docs[tag].remove(task_id)
if self._tag_docs[tag]:
return
button = self._tag_buttons[tag]
self.tag_buttons.removeWidget(button)
del self._tag_buttons[tag]
def update_tags(self, task_id, old_tags, new_tags):
for tag in old_tags - new_tags:
self.remove_tag(task_id, tag)
for tag in new_tags - old_tags:
self.add_tag(task_id, tag)
def update_task_text(self, text):
"""Edit an existing todo item."""
item = self.item
task = item.task
task.title = text
old_tags = set(task.tags) if task.tags else set([])
new_tags = set(extract_tags(text))
self.update_tags(item.task.task_id, old_tags, new_tags)
task.tags = list(new_tags)
# disconnect the signal temporarily while we change the title
self.todo_list.itemChanged.disconnect(self.item_changed)
item.setText(text)
# reconnect the signal after we changed the title
self.todo_list.itemChanged.connect(self.item_changed)
self.store.save_task(task)
def row_changed(self, index):
"""Edit item when row changes."""
if index == -1:
self.task_edit.clear()
return
self.edit_item(self.todo_list.item(index))
def edit_item(self, item):
"""Edit item in task edit box."""
self.item = item
self.task_edit.setText(item.task.title)
if __name__ == "__main__":
# Unfortunately, to be able to use ubuntuone.platform.credentials on linux,
# we now depend on dbus. :(
from dbus.mainloop.qt import DBusQtMainLoop
main_loop = DBusQtMainLoop(set_as_default=True)
app = QtGui.QApplication(sys.argv)
main = Main()
main.show()
app.exec_()
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