Start work on preview panel

src/calibre/gui2/tweak_book/boss.py

@@ -388,6 +388,7 @@ class Boss(QObject):
     def shutdown(self):
         self.save_state()
         self.save_manager.shutdown()
+        self.gui.preview.parse_worker.shutdown()
         self.save_manager.wait(0.1)
 
     def save_state(self):

src/calibre/gui2/tweak_book/preview.py

@@ -0,0 +1,98 @@
+#!/usr/bin/env python
+# vim:fileencoding=utf-8
+from __future__ import (unicode_literals, division, absolute_import,
+                        print_function)
+
+__license__ = 'GPL v3'
+__copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
+
+from threading import Thread
+from Queue import Queue, Empty
+
+from PyQt4.Qt import (QWidget, QVBoxLayout, QApplication, QSize, QNetworkAccessManager)
+from PyQt4.QtWebKit import QWebView
+
+from calibre.gui2.viewer.documentview import apply_settings
+from calibre.gui2.viewer.config import config
+from calibre.utils.ipc.simple_worker import offload_worker
+
+shutdown = object()
+
+class ParseWorker(Thread):
+
+    daemon = True
+
+    def __init__(self):
+        Thread.__init__(self)
+        self.worker = offload_worker(priority='low')
+        self.requests = Queue()
+        self.request_count = 0
+        self.start()
+
+    def run(self):
+        try:
+            # Connect to the worker and send a dummy job to initialize it
+            self.worker(None, None, (), {})
+        except:
+            import traceback
+            traceback.print_exc()
+            return
+
+        while True:
+            x = self.requests.get()
+            requests = [x]
+            while True:
+                try:
+                    requests.append(self.requests.get_nowait())
+                except Empty:
+                    break
+            if shutdown in requests:
+                self.worker.shutdown()
+                break
+            request = sorted(requests, reverse=True)[0]
+            del requests
+            request
+
+    def shutdown(self):
+        self.requests.put(shutdown)
+
+class NetworkAccessManager(QNetworkAccessManager):
+
+    OPERATION_NAMES = {getattr(QNetworkAccessManager, '%sOperation'%x) :
+            x.upper() for x in ('Head', 'Get', 'Put', 'Post', 'Delete',
+                'Custom')
+    }
+
+    def createRequest(self, operation, request, data):
+        url = unicode(request.url().toString())
+        print (url)
+        return QNetworkAccessManager.createRequest(self, operation, request,
+                data)
+
+class WebView(QWebView):
+
+    def __init__(self, parent=None):
+        QWebView.__init__(self, parent)
+        w = QApplication.instance().desktop().availableGeometry(self).width()
+        self._size_hint = QSize(int(w/3), int(w/2))
+        settings = self.page().settings()
+        apply_settings(settings, config().parse())
+        settings.setMaximumPagesInCache(0)
+        self.setHtml('<p>')
+        self.nam = NetworkAccessManager(self)
+        self.page().setNetworkAccessManager(self.nam)
+
+    def sizeHint(self):
+        return self._size_hint
+
+class Preview(QWidget):
+
+    def __init__(self, parent=None):
+        QWidget.__init__(self, parent)
+        self.l = l = QVBoxLayout()
+        self.setLayout(l)
+        l.setContentsMargins(0, 0, 0, 0)
+        self.parse_worker = ParseWorker()
+        self.view = WebView(self)
+        l.addWidget(self.view)
+

src/calibre/gui2/tweak_book/ui.py

@@ -17,6 +17,7 @@ from calibre.gui2.tweak_book.file_list import FileListWidget
 from calibre.gui2.tweak_book.job import BlockingJob
 from calibre.gui2.tweak_book.boss import Boss
 from calibre.gui2.tweak_book.keyboard import KeyboardManager
+from calibre.gui2.tweak_book.preview import Preview
 
 class Central(QStackedWidget):
     ' The central widget, hosts the editors '
@@ -190,6 +191,13 @@ class Main(MainWindow):
         d.setWidget(self.file_list)
         self.addDockWidget(Qt.LeftDockWidgetArea, d)
 
+        self.preview_dock = d = QDockWidget(_('&Book preview'), self)
+        d.setObjectName('file_list_dock')  # Needed for saveState
+        d.setAllowedAreas(Qt.LeftDockWidgetArea | Qt.RightDockWidgetArea)
+        self.preview = Preview(d)
+        d.setWidget(self.preview)
+        self.addDockWidget(Qt.RightDockWidgetArea, d)
+
     def resizeEvent(self, ev):
         self.blocking_job.resize(ev.size())
         return super(Main, self).resizeEvent(ev)

src/calibre/gui2/viewer/documentview.py

@@ -30,6 +30,18 @@ from calibre.ebooks.oeb.display.webview import load_html
 from calibre.constants import isxp, iswindows
 # }}}
 
+def apply_settings(settings, opts):
+    settings.setFontSize(QWebSettings.DefaultFontSize, opts.default_font_size)
+    settings.setFontSize(QWebSettings.DefaultFixedFontSize, opts.mono_font_size)
+    settings.setFontSize(QWebSettings.MinimumLogicalFontSize, opts.minimum_font_size)
+    settings.setFontSize(QWebSettings.MinimumFontSize, opts.minimum_font_size)
+    settings.setFontFamily(QWebSettings.StandardFont, {'serif':opts.serif_family, 'sans':opts.sans_family, 'mono':opts.mono_family}[opts.standard_font])
+    settings.setFontFamily(QWebSettings.SerifFont, opts.serif_family)
+    settings.setFontFamily(QWebSettings.SansSerifFont, opts.sans_family)
+    settings.setFontFamily(QWebSettings.FixedFont, opts.mono_family)
+    settings.setAttribute(QWebSettings.ZoomTextOnly, True)
+
+
 class Document(QWebPage):  # {{{
 
     page_turn = pyqtSignal(object)
@@ -38,15 +50,7 @@ class Document(QWebPage):  # {{{
 
     def set_font_settings(self, opts):
         settings = self.settings()
-        settings.setFontSize(QWebSettings.DefaultFontSize, opts.default_font_size)
+        apply_settings(settings, opts)
-        settings.setFontSize(QWebSettings.DefaultFixedFontSize, opts.mono_font_size)
-        settings.setFontSize(QWebSettings.MinimumLogicalFontSize, opts.minimum_font_size)
-        settings.setFontSize(QWebSettings.MinimumFontSize, opts.minimum_font_size)
-        settings.setFontFamily(QWebSettings.StandardFont, {'serif':opts.serif_family, 'sans':opts.sans_family, 'mono':opts.mono_family}[opts.standard_font])
-        settings.setFontFamily(QWebSettings.SerifFont, opts.serif_family)
-        settings.setFontFamily(QWebSettings.SansSerifFont, opts.sans_family)
-        settings.setFontFamily(QWebSettings.FixedFont, opts.mono_family)
-        settings.setAttribute(QWebSettings.ZoomTextOnly, True)
 
     def do_config(self, parent=None):
         d = ConfigDialog(self.shortcuts, parent)

src/calibre/utils/ipc/simple_worker.py

@@ -206,7 +206,7 @@ def fork_job(mod_name, func_name, args=(), kwargs={}, timeout=300,  # seconds
 
 def offload_worker(env={}, priority='normal', cwd=None):
     listener, w = create_worker(env=env, priority=priority, cwd=cwd, func='offload')
-    return OffloadWorker(listener)
+    return OffloadWorker(listener, w)
 
 def compile_code(src):
     import re, io