E-book viewer: Fix viewer losing place in very long single file documents when window resized. Fixes #745001 (Book jumps ahead several pages when closing the table of contents window)

src/calibre/ebooks/metadata/sources/amazon.py

@@ -483,7 +483,6 @@ class Amazon(Source):
             log.exception('Failed to download cover from:', cached_url)
     # }}}
 
-
 if __name__ == '__main__': # tests {{{
     # To run these test use: calibre-debug -e
     # src/calibre/ebooks/metadata/sources/amazon.py

src/calibre/ebooks/metadata/xisbn.py

@@ -76,9 +76,9 @@ class xISBN(object):
 xisbn = xISBN()
 
 if __name__ == '__main__':
-    import sys
+    import sys, pprint
     isbn = sys.argv[-1]
-    print xisbn.get_data(isbn)
+    print pprint.pprint(xisbn.get_data(isbn))
     print
     print xisbn.get_associated_isbns(isbn)
 

src/calibre/gui2/viewer/documentview.py

@@ -171,10 +171,11 @@ class Document(QWebPage): # {{{
             self.misc_config()
             self.after_load()
 
-    def __init__(self, shortcuts, parent=None):
+    def __init__(self, shortcuts, parent=None, resize_callback=lambda: None):
         QWebPage.__init__(self, parent)
         self.setObjectName("py_bridge")
         self.debug_javascript = False
+        self.resize_callback = resize_callback
         self.current_language = None
         self.loaded_javascript = False
 
@@ -237,6 +238,12 @@ class Document(QWebPage): # {{{
         if self.loaded_javascript:
             return
         self.loaded_javascript = True
+        self.javascript(
+            '''
+            window.onresize = function(event) {
+                window.py_bridge.window_resized();
+            }
+            ''')
         if jquery is None:
             jquery = P('content_server/jquery.js', data=True)
         self.javascript(jquery)
@@ -298,6 +305,10 @@ class Document(QWebPage): # {{{
     def debug(self, msg):
         prints(msg)
 
+    @pyqtSignature('')
+    def window_resized(self):
+        self.resize_callback()
+
     def reference_mode(self, enable):
         self.javascript(('enter' if enable else 'leave')+'_reference_mode()')
 
@@ -424,12 +435,19 @@ class Document(QWebPage): # {{{
     def xpos(self):
         return self.mainFrame().scrollPosition().x()
 
-    @property
+    @dynamic_property
     def scroll_fraction(self):
+        def fget(self):
             try:
                 return float(self.ypos)/(self.height-self.window_height)
             except ZeroDivisionError:
                 return 0.
+        def fset(self, val):
+            npos = val * (self.height - self.window_height)
+            if npos < 0:
+                npos = 0
+            self.scroll_to(x=self.xpos, y=npos)
+        return property(fget=fget, fset=fset)
 
     @property
     def hscroll_fraction(self):
@@ -493,7 +511,8 @@ class DocumentView(QWebView): # {{{
         self._size_hint = QSize(510, 680)
         self.initial_pos = 0.0
         self.to_bottom = False
-        self.document = Document(self.shortcuts, parent=self)
+        self.document = Document(self.shortcuts, parent=self,
+                resize_callback=self.viewport_resized)
         self.setPage(self.document)
         self.manager = None
         self._reference_mode = False
@@ -630,9 +649,13 @@ class DocumentView(QWebView): # {{{
     def sizeHint(self):
         return self._size_hint
 
-    @property
+    @dynamic_property
     def scroll_fraction(self):
+        def fget(self):
             return self.document.scroll_fraction
+        def fset(self, val):
+            self.document.scroll_fraction = float(val)
+        return property(fget=fget, fset=fset)
 
     @property
     def hscroll_fraction(self):
@@ -968,9 +991,11 @@ class DocumentView(QWebView): # {{{
     def resizeEvent(self, event):
         ret = QWebView.resizeEvent(self, event)
         QTimer.singleShot(10, self.initialize_scrollbar)
+        return ret
+
+    def viewport_resized(self):
         if self.manager is not None:
             self.manager.viewport_resized(self.scroll_fraction)
-        return ret
 
     def event(self, ev):
         typ = ev.type()

src/calibre/gui2/viewer/main.py

@@ -240,7 +240,7 @@ class EbookViewer(MainWindow, Ui_EbookViewer):
         self.connect(self.action_reference_mode, SIGNAL('triggered(bool)'),
                      lambda x: self.view.reference_mode(x))
         self.connect(self.action_metadata, SIGNAL('triggered(bool)'), lambda x:self.metadata.setVisible(x))
-        self.connect(self.action_table_of_contents, SIGNAL('toggled(bool)'), lambda x:self.toc.setVisible(x))
+        self.action_table_of_contents.toggled[bool].connect(self.set_toc_visible)
         self.connect(self.action_copy, SIGNAL('triggered(bool)'), self.copy)
         self.connect(self.action_font_size_larger, SIGNAL('triggered(bool)'),
                      self.font_size_larger)
@@ -310,6 +310,9 @@ class EbookViewer(MainWindow, Ui_EbookViewer):
 
         self.restore_state()
 
+    def set_toc_visible(self, yes):
+        self.toc.setVisible(yes)
+
     def clear_recent_history(self, *args):
         vprefs.set('viewer_open_history', [])
         self.build_recent_menu()