From 43ef8c02eacdebd1d7e9442346bcf37e323d35d7 Mon Sep 17 00:00:00 2001
From: Gonzalo Odiard <godiard@gmail.com>
Date: Tue, 07 Feb 2012 19:50:58 +0000
Subject: Wait until one file is loaded before trying to load another file

Added a semaphore and removed code where the change of pages from one file to another
was miscalculated.

Signed-off-by: Gonzalo Odiard <gonzalo@laptop.org>
---
diff --git a/epubview/epubview.py b/epubview/epubview.py
index a626fe1..1813cbe 100644
--- a/epubview/epubview.py
+++ b/epubview/epubview.py
@@ -57,6 +57,7 @@ class _View(gtk.HBox):
         self._ready = False
         self._paginator = None
         self._loaded_page = -1
+        self._file_loaded = True
         #self._old_scrollval = -1
         self._loaded_filename = None
         self._pagecount = -1
@@ -385,12 +386,12 @@ class _View(gtk.HBox):
             if self._v_vscrollbar.get_value() >= \
                 self._v_vscrollbar.props.adjustment.props.upper - \
                     self._v_vscrollbar.props.adjustment.props.page_size:
-                self._load_next_file()
+                self._load_page(self._loaded_page + 1)
                 return True
         elif self.__going_back:
             if self._v_vscrollbar.get_value() == \
                     self._v_vscrollbar.props.adjustment.props.lower:
-                self._load_prev_file()
+                self._load_page(self._loaded_page - 1)
                 return True
 
         return False
@@ -400,6 +401,7 @@ class _View(gtk.HBox):
         # possible Webkit bug. See : https://bugs.launchpad.net/bugs/483231
         self._sw.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_NEVER)
 
+        self._file_loaded = True
         filename = self._view.props.uri.replace('file://', '')
         if os.path.exists(filename.replace('xhtml', 'xml')):
             # Hack for making javascript work
@@ -566,10 +568,15 @@ class _View(gtk.HBox):
             return
 
         self._on_page_changed(self._loaded_page, pageno)
+
         filename = self._paginator.get_file_for_pageno(pageno)
         filename = filename.replace('file://', '')
         if filename != self._loaded_filename:
             self._loaded_filename = filename
+            if not self._file_loaded:
+                # wait until the file is loaded
+                return
+            self._file_loaded = False
 
             """
             TODO: disabled because javascript can't be executed
@@ -600,18 +607,6 @@ class _View(gtk.HBox):
         o.close()
         shutil.copy(file_name + '.tmp', file_name)
 
-    def _load_next_file(self):
-        if self._loaded_page == self._pagecount:
-            return
-        cur_file = self._paginator.get_file_for_pageno(self._loaded_page)
-        pageno = self._loaded_page
-        while pageno < self._paginator.get_total_pagecount():
-            pageno += 1
-            if self._paginator.get_file_for_pageno(pageno) != cur_file:
-                break
-
-        self._load_page(pageno)
-
     def _load_file(self, path):
         #TODO: This is a bit suboptimal - fix it
         for pageno in range(1, self.get_pagecount()):
@@ -620,18 +615,6 @@ class _View(gtk.HBox):
                 self._load_page(pageno)
                 break
 
-    def _load_prev_file(self):
-        if self._loaded_page == 1:
-            return
-        cur_file = self._paginator.get_file_for_pageno(self._loaded_page)
-        pageno = self._loaded_page
-        while pageno > 1:
-            pageno -= 1
-            if self._paginator.get_file_for_pageno(pageno) != cur_file:
-                break
-
-        self._load_page(pageno)
-
     def _scrollbar_change_value_cb(self, range, scrolltype, value):
         if scrolltype == gtk.SCROLL_STEP_FORWARD:
             self.__going_fwd = True
--
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