mirror of
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269 lines
12 KiB
Plaintext
269 lines
12 KiB
Plaintext
# vim:fileencoding=utf-8
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# License: GPL v3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
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from __python__ import bound_methods, hash_literals
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from book_list.globals import get_session_data, get_boss
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from dom import set_css
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from elementmaker import E
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from gettext import gettext as _
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from read_book.globals import messenger, iframe_id
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from read_book.resources import load_resources
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from read_book.overlay import Overlay
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from utils import parse_url_params, username_key
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LOADING_DOC = '''
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<!DOCTYPE html>
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<html>
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<head>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<script type="text/javascript" id="bootstrap">
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__SCRIPT__
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end_script
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</head>
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<body>
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<div style="font-family: sans-serif; font-size:larger; font-weight: bold; margin-top:48vh; text-align:center">
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__BS__
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</div>
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</body>
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</html>
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'''.replace('end_script', '<' + '/script>') # cannot have a closing script tag as this is embedded inside a script tag in index.html
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class View:
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def __init__(self, container, ui):
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self.ui = ui
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self.loaded_resources = {}
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sd = get_session_data()
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container.appendChild(
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E.div(style='width: 100vw; height: 100vh; overflow: hidden; display: flex; align-items: stretch', # container for horizontally aligned panels
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E.div(style='display: flex; flex-direction: column; align-items: stretch; flex-grow:2', # container for iframe and any other panels in the same column
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E.div(style='flex-grow: 2; display:flex; align-items: stretch', # container for iframe and its overlay
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E.div(style='width:{}px; height:100%'.format(sd.get('margin_left', 20)), id='book-left-margin'),
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E.div(style='flex-grow:2; display:flex; align-items:stretch; flex-direction: column', # container for top and bottom margins
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E.div(style='height:{}px; width:100%; padding: 0'.format(sd.get('margin_top', 20)), id='book-top-margin'),
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E.iframe(id=iframe_id, seamless=True, sandbox='allow-popups allow-scripts', style='flex-grow: 2'),
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E.div(style='height:{}px; width:100%; padding: 0'.format(sd.get('margin_bottom', 20)), id='book-bottom-margin'),
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),
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E.div(style='width:{}px; height:100%'.format(sd.get('margin_right', 20)), id='book-right-margin'),
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E.div(style='position: absolute; top:0; left:0; width: 100%; height: 100%; display:none', id='book-overlay'), # overlay
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)
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)
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)
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)
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self.overlay = Overlay(self)
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self.src_doc = None
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self.iframe_ready = False
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self.pending_load = None
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self.encrypted_communications = False
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self.create_src_doc()
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window.addEventListener('message', self.handle_message, False)
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self.handlers = {
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'ready': self.on_iframe_ready,
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'error': self.on_iframe_error,
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'next_spine_item': self.on_next_spine_item,
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'goto_doc_boundary': self.goto_doc_boundary,
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'scroll_to_anchor': self.on_scroll_to_anchor,
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'update_cfi': self.on_update_cfi,
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'content_loaded': self.on_content_loaded,
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}
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self.currently_showing = {}
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document.getElementById('book-top-margin').addEventListener('click', self.top_margin_clicked)
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@property
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def iframe(self):
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return document.getElementById(iframe_id)
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def top_margin_clicked(self, event):
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if event.button is 0:
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event.preventDefault(), event.stopPropagation()
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self.overlay.show()
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def set_margins(self, no_margins):
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sd = get_session_data()
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margin_left = 0 if no_margins else sd.get('margin_left')
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margin_right = 0 if no_margins else sd.get('margin_right')
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margin_top = 0 if no_margins else sd.get('margin_top')
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margin_bottom = 0 if no_margins else sd.get('margin_bottom')
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max_text_height = sd.get('max_text_height')
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th = window.innerHeight - margin_top - margin_bottom
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if not no_margins and max_text_height > 100 and th > max_text_height:
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extra = (th - max_text_height) // 2
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margin_top += extra
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margin_bottom += extra
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max_text_width = sd.get('max_text_width')
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tw = window.innerWidth - margin_left - margin_right
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if not no_margins and max_text_width > 100 and tw > max_text_width:
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extra = (tw - max_text_width) // 2
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margin_left += extra
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margin_right += extra
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set_css(document.getElementById('book-top-margin'), height=margin_top + 'px')
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set_css(document.getElementById('book-bottom-margin'), height=margin_bottom + 'px')
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set_css(document.getElementById('book-left-margin'), width=margin_left + 'px')
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set_css(document.getElementById('book-right-margin'), width=margin_right + 'px')
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def create_src_doc(self):
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iframe_script = self.ui.interface_data.main_js.replace(/is_running_in_iframe\s*=\s*false/, 'is_running_in_iframe = true')
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self.ui.interface_data.main_js = None
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self.src_doc = self.iframe.srcdoc = LOADING_DOC.replace(
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'__BS__', _('Bootstrapping book reader...')).replace(
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'__SCRIPT__', iframe_script)
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def init_iframe(self, iframe_script):
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self.encrypted_communications = False
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self.iframe.srcdoc = self.src_doc
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def send_message(self, action, **data):
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data.action = action
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if self.encrypted_communications:
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data = messenger.encrypt(data)
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self.iframe.contentWindow.postMessage(data, '*')
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def handle_message(self, event):
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if event.source is not self.iframe.contentWindow:
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return
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data = event.data
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if self.encrypted_communications:
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try:
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data = messenger.decrypt(data)
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except Exception as e:
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print('Could not process message from iframe:')
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console.log(e)
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return
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func = self.handlers[data.action]
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if func:
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func(data)
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else:
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print('Unknown action in message from iframe to parent: ' + data.action)
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def on_iframe_ready(self, data):
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messenger.reset()
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self.send_message('initialize', secret=messenger.secret, translations=self.ui.interface_data.translations)
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self.iframe_ready = True
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if self.pending_load:
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data = self.pending_load
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self.pending_load = None
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self.show_spine_item_stage2(data)
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def on_iframe_error(self, data):
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self.ui.show_error((data.title or _('There was an error processing the book')), data.msg, data.details)
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def on_resize(self):
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pass
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def show_loading(self):
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title = self.book.metadata.title
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name = self.currently_showing.name
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self.overlay.show_loading_message(_(
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'Loading <i>{name}</i> from <i>{title}</i>, please wait...').format(name=name, title=title))
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def hide_loading(self):
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self.overlay.hide_loading_message()
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def display_book(self, book):
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self.book = book
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self.ui.db.update_last_read_time(book)
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self.loaded_resources = {}
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pos = {'replace_history':True}
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unkey = username_key(self.ui.interface_data.username)
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name = book.manifest.spine[0]
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cfi = None
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q = parse_url_params()
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if q.bookpos and q.bookpos.startswith('epubcfi(/'):
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cfi = q.bookpos
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elif book.last_read_position and book.last_read_position[unkey]:
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cfi = book.last_read_position[unkey]
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if cfi and cfi.startswith('epubcfi(/'):
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cfi = cfi[len('epubcfi(/'):-1]
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snum, rest = cfi.partition('/')[::2]
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try:
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snum = int(snum)
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except Exception:
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print('Invalid spine number in CFI:', snum)
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if type(snum) == 'number':
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name = book.manifest.spine[(int(snum) // 2) - 1] or name
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pos.type, pos.cfi = 'cfi', '/' + rest
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self.show_name(name, initial_position=pos)
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def show_name(self, name, initial_position=None):
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if self.currently_showing.loading:
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return
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sd = get_session_data()
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settings={
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'margin_left': 0 if name is self.book.manifest.title_page_name else sd.get('margin_left'),
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'margin_right': 0 if name is self.book.manifest.title_page_name else sd.get('margin_right'),
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'read_mode': sd.get('read_mode'),
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'cols_per_screen': sd.get('cols_per_screen'),
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}
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initial_position = initial_position or {'replace_history':False}
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self.currently_showing = {'name':name, 'settings':settings, 'initial_position':initial_position, 'loading':True}
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self.show_loading()
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spine = self.book.manifest.spine
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idx = spine.indexOf(name)
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if idx > -1:
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self.currently_showing.bookpos = 'epubcfi(/{})'.format(2 * (idx +1))
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self.set_margins(name is self.book.manifest.title_page_name)
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load_resources(self.ui.db, self.book, name, self.loaded_resources, self.show_spine_item)
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def goto_doc_boundary(self, data):
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name = self.book.manifest.spine[0 if data.start else self.book.manifest.spine.length - 1]
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self.show_name(name, initial_position={'type':'frac', 'frac':0 if data.start else 1, 'replace_history':False})
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def on_scroll_to_anchor(self, data):
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self.show_name(data.name, initial_position={'type':'anchor', 'anchor':data.frag, 'replace_history':False})
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def goto_named_destination(self, name, frag):
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if self.currently_showing.name is name:
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self.send_message('scroll_to_anchor', frag=frag)
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else:
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spine = self.book.manifest.spine
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idx = spine.indexOf(name)
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if idx is -1:
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self.ui.show_error(_('Destination does not exist'), _(
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'The file {} does not exist in this book').format(name))
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return
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self.show_name(name, initial_position={'type':'anchor', 'anchor':frag, 'replace_history':False})
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def on_next_spine_item(self, data):
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spine = self.book.manifest.spine
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idx = spine.indexOf(self.currently_showing.name)
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if data.previous:
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if idx is 0:
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return
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idx = min(spine.length - 1, max(idx - 1, 0))
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self.show_name(spine[idx], initial_position={'type':'frac', 'frac':1, 'replace_history':True})
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else:
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if idx is spine.length - 1:
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return
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idx = max(0, min(spine.length - 1, idx + 1))
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self.show_name(spine[idx], initial_position={'type':'frac', 'frac':0, 'replace_history':True})
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def on_update_cfi(self, data):
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self.currently_showing.bookpos = data.cfi
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get_boss().push_state(replace=data.replace_history)
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unkey = username_key(self.ui.interface_data.username)
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if not self.book.last_read_position:
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self.book.last_read_position = {}
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self.book.last_read_position[unkey] = data.cfi
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self.ui.db.update_last_read_time(self.book)
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def show_spine_item(self, resource_data):
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self.loaded_resources = resource_data
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# Re-init the iframe to ensure any changes made to the environment by the last spine item are lost
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self.init_iframe()
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# Now wait for iframe to message that it is ready
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self.pending_load = resource_data
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def show_spine_item_stage2(self, resource_data):
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self.currently_showing.loading = False
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self.send_message('display',
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resource_data=resource_data, book=self.book, name=self.currently_showing.name,
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initial_position=self.currently_showing.initial_position,
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settings=self.currently_showing.settings,
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)
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self.encrypted_communications = True
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def on_content_loaded(self):
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self.hide_loading()
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# self.overlay.show()
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