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eaf_pdf_document.py
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eaf_pdf_document.py
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# -*- coding: utf-8 -*-
# Copyright (C) 2018 Andy Stewart
#
# Author: Andy Stewart <lazycat.manatee@gmail.com>
# Maintainer: Andy Stewart <lazycat.manatee@gmail.com>
#
# 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
# 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/>.
import functools
import os
import fitz
from core.utils import PostGui, get_emacs_vars, message_to_emacs
from eaf_pdf_page import PdfPage
def get_page_crop_box(page):
if hasattr(page, "page_cropbox"):
return page.page_cropbox
else:
return page.page_cropbox
def set_page_crop_box(page):
if hasattr(page, "set_cropbox"):
return page.set_cropbox
else:
return page.set_cropbox
class PdfDocument(fitz.Document):
def __init__(self, document):
self.document = document
self._is_trim_margin = False
self._page_cache_dict = {}
self._document_page_clip = None
self._document_page_change = lambda rect: None
def __getattr__(self, attr):
return getattr(self.document, attr)
def __getitem__(self, index):
if index in self._page_cache_dict:
page = self._page_cache_dict[index]
if not self._is_trim_margin:
return page
if page.cropbox == self._document_page_clip:
return page
page = PdfPage(self.document[index], index, self.document.is_pdf)
# udpate the page clip
new_rect_clip = self.computer_page_clip(page.get_tight_margin_rect(), self._document_page_clip)
if new_rect_clip != self._document_page_clip:
self._document_page_clip = new_rect_clip
if self._is_trim_margin:
self._document_page_change(new_rect_clip)
if self._is_trim_margin:
return PdfPage(self.document[index], index, self.document.is_pdf, self._document_page_clip)
return page
def computer_page_clip(self, *args):
'''Update the bestest max page clip.'''
dr = None
for r in args:
if r is None:
continue
if dr is None:
dr = r
continue
x0 = min(r.x0, dr.x0)
y0 = min(r.y0, dr.y0)
x1 = max(r.x1, dr.x1)
y1 = max(r.y1, dr.y1)
dr = fitz.Rect(x0, y0, x1, y1)
return dr
def reload_document(self, url):
self._page_cache_dict = {}
try:
self.document = fitz.open(url)
if self.watch_callback is not None:
self.watch_callback(url)
self.file_changed_timer.stop()
except Exception:
self.watch_callback = None
if os.path.exists(url):
self.file_changed_timer.start()
print("Failed to reload PDF file: " + url)
def cache_page(self, index, page):
self._page_cache_dict[index] = page
def remove_cache(self, index):
self._page_cache_dict.pop(index)
def reset_cache(self):
self._page_cache_dict.clear()
def watch_file(self, path, callback):
'''
Refresh content with PDF file changed.
'''
from PyQt6.QtCore import QFileSystemWatcher
self.watch_callback = callback
self.file_changed_wacher = QFileSystemWatcher()
self.file_changed_wacher.addPath(path)
self.file_changed_wacher.fileChanged.connect(self.handle_file_changed)
@PostGui()
def handle_file_changed(self, path):
'''
Use the QFileSystemWatcher watch file changed. If the watch file have been remove or rename,
this watch will auto remove.
'''
from PyQt6.QtCore import QTimer
if path in self.file_changed_wacher.files():
self.file_changed_timer = QTimer()
self.file_changed_timer.setInterval(500)
self.file_changed_timer.setSingleShot(True)
reload_callback = functools.partial(self.reload_document, path)
self.file_changed_timer.timeout.connect(reload_callback)
self.file_changed_timer.start()
notify, = get_emacs_vars(["eaf-pdf-notify-file-changed"])
if notify:
message_to_emacs("Detected that {} has been changed. Refreshing buffer...".format(path))
def toggle_trim_margin(self):
self._is_trim_margin = not self._is_trim_margin
def get_page_width(self):
if self.is_pdf:
if self._is_trim_margin:
return self._document_page_clip.width
return get_page_crop_box(self.document)(0).width
else:
return self[0].clip.width
def get_page_height(self):
if self.is_pdf:
if self._is_trim_margin:
return self._document_page_clip.height
return get_page_crop_box(self.document)(0).height
else:
return self[0].clip.height
def watch_page_size_change(self, callback):
self._document_page_change = callback