Files
Lector/library.py
2017-12-29 00:35:02 +05:30

230 lines
8.7 KiB
Python

#!/usr/bin/env python3
# This file is a part of Lector, a Qt based ebook reader
# Copyright (C) 2017 BasioMeusPuga
# This program 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 3 of the License, or
# (at your option) any later version.
# This program 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, see <http://www.gnu.org/licenses/>.
# TODO
# Implement filterAcceptsRow for the view_model
import os
import pickle
import database
from PyQt5 import QtGui, QtCore
from models import MostExcellentTableModel, TableProxyModel
class Library:
def __init__(self, parent):
self.parent = parent
self.view_model = None
self.proxy_model = None
self.table_model = None
self.table_proxy_model = None
self.table_rows = []
def generate_model(self, mode, parsed_books=None):
if mode == 'build':
self.table_rows = []
self.view_model = QtGui.QStandardItemModel()
books = database.DatabaseFunctions(
self.parent.database_path).fetch_data(
('*',),
'books',
{'Title': ''},
'LIKE')
if not books:
print('Database returned nothing')
return
elif mode == 'addition':
# Assumes self.view_model already exists and may be extended
# Because any additional books have already been added to the
# database using background threads
books = []
for i in parsed_books.items():
# Scheme
# 1: Title, 2: Author, 3: Year, 4: Path
# 5: Position, 6: isbn, 7: Tags, 8: Hash
# 9: CoverImage
_tags = i[1]['tags']
if _tags:
_tags = ', '.join([j for j in _tags if j])
books.append([
None, i[1]['title'], i[1]['author'], i[1]['year'], i[1]['path'],
None, i[1]['isbn'], _tags, i[0], i[1]['cover_image']])
else:
return
for i in books:
# The database query returns (or the extension data is)
# an iterable with the following indices:
# Index 0 is the key ID is ignored
title = i[1]
author = i[2]
year = i[3]
path = i[4]
tags = i[7]
cover = i[9]
position = i[5]
if position:
position = pickle.loads(position)
file_exists = os.path.exists(path)
all_metadata = {
'title': title,
'author': author,
'year': year,
'path': path,
'position': position,
'isbn': i[6],
'tags': tags,
'hash': i[8],
'file_exists': file_exists}
tooltip_string = title + '\nAuthor: ' + author + '\nYear: ' + str(year)
if tags:
tooltip_string += ('\nTags: ' + tags)
# This remarkably ugly hack is because the QSortFilterProxyModel
# doesn't easily allow searching through multiple item roles
search_workaround = title + ' ' + author
if tags:
search_workaround += tags
# Generate image pixmap and then pass it to the widget
# as a QIcon
# Additional data can be set using an incrementing
# QtCore.Qt.UserRole
# QtCore.Qt.DisplayRole is the same as item.setText()
# The model is a single row and has no columns
img_pixmap = QtGui.QPixmap()
if cover:
img_pixmap.loadFromData(cover)
else:
img_pixmap.load(':/images/NotFound.png')
img_pixmap = img_pixmap.scaled(420, 600, QtCore.Qt.IgnoreAspectRatio)
item = QtGui.QStandardItem()
item.setToolTip(tooltip_string)
# The following order is needed to keep sorting working
item.setData(title, QtCore.Qt.UserRole)
item.setData(author, QtCore.Qt.UserRole + 1)
item.setData(year, QtCore.Qt.UserRole + 2)
item.setData(all_metadata, QtCore.Qt.UserRole + 3)
item.setData(search_workaround, QtCore.Qt.UserRole + 4)
item.setData(file_exists, QtCore.Qt.UserRole + 5)
item.setData(i[8], QtCore.Qt.UserRole + 6) # File hash
item.setData(position, QtCore.Qt.UserRole + 7)
item.setIcon(QtGui.QIcon(img_pixmap))
self.view_model.appendRow(item)
# all_metadata is just being sent. It is not being displayed
# It will be correlated to the current row as its first userrole
self.table_rows.append(
[title, author, None, year, tags, all_metadata, i[8]])
def create_table_model(self):
table_header = ['Title', 'Author', 'Status', 'Year', 'Tags']
self.table_model = MostExcellentTableModel(
table_header, self.table_rows, self.parent.temp_dir.path())
self.create_table_proxy_model()
def create_table_proxy_model(self):
self.table_proxy_model = TableProxyModel()
self.table_proxy_model.setSourceModel(self.table_model)
self.table_proxy_model.setSortCaseSensitivity(False)
self.table_proxy_model.sort(0, QtCore.Qt.AscendingOrder)
self.parent.tableView.setModel(self.table_proxy_model)
self.parent.tableView.horizontalHeader().setSortIndicator(
0, QtCore.Qt.AscendingOrder)
self.update_table_proxy_model()
def update_table_proxy_model(self):
self.table_proxy_model.invalidateFilter()
self.table_proxy_model.setFilterParams(
self.parent.libraryToolBar.searchBar.text(), [0, 1, 4])
# This isn't needed, but it forces a model update every time the
# text in the line edit changes. So I guess it is needed.
self.table_proxy_model.setFilterFixedString(
self.parent.libraryToolBar.searchBar.text())
def create_proxymodel(self):
self.proxy_model = QtCore.QSortFilterProxyModel()
self.proxy_model.setSourceModel(self.view_model)
self.proxy_model.setSortCaseSensitivity(False)
s = QtCore.QSize(160, 250) # Set icon sizing here
self.parent.listView.setIconSize(s)
self.parent.listView.setModel(self.proxy_model)
self.update_proxymodel()
def update_proxymodel(self):
self.proxy_model.setFilterRole(QtCore.Qt.UserRole + 4)
self.proxy_model.setFilterCaseSensitivity(QtCore.Qt.CaseInsensitive)
self.proxy_model.setFilterWildcard(
self.parent.libraryToolBar.searchBar.text())
self.parent.statusMessage.setText(
str(self.proxy_model.rowCount()) + ' books')
# Sorting according to roles and the drop down in the library
self.proxy_model.setSortRole(
QtCore.Qt.UserRole + self.parent.libraryToolBar.sortingBox.currentIndex())
self.proxy_model.sort(0)
def prune_models(self, valid_paths):
# To be executed when the library is updated by folder
# All files in unselected directories will have to be removed
# from both of the models
# They will also have to be deleted from the library
valid_paths = set(valid_paths)
# Get all paths in the dictionary from either of the models
# self.table_rows has all file metadata in position 5
all_paths = [i[5]['path'] for i in self.table_rows]
all_paths = set(all_paths)
invalid_paths = all_paths - valid_paths
# Remove invalid paths from both of the models
self.table_rows = [
i for i in self.table_rows if i[5]['path'] not in invalid_paths]
deletable_persistent_indexes = []
for i in range(self.view_model.rowCount()):
item = self.view_model.item(i)
path = item.data(QtCore.Qt.UserRole + 3)['path']
if path in invalid_paths:
deletable_persistent_indexes.append(
QtCore.QPersistentModelIndex(item.index()))
if deletable_persistent_indexes:
for i in deletable_persistent_indexes:
self.view_model.removeRow(i.row())
# Remove invalid paths from the database as well
database.DatabaseFunctions(
self.parent.database_path).delete_from_database('Path', invalid_paths)