Some utility functions to control the viewer position with page numbers in paged mode

src/calibre/ebooks/oeb/display/paged.coffee

@@ -350,6 +350,9 @@ class PagedDisplay
         else
             window.scrollTo(pos, 0)
 
+    scroll_to_column: (number) ->
+        this.scroll_to_xpos(number * this.page_width + 10)
+
     column_at: (xpos) ->
         # Return the number of the column that contains xpos
         return Math.floor(xpos/this.page_width)

src/calibre/ebooks/oeb/display/utils.coffee

@@ -51,6 +51,15 @@ class CalibreUtils
                 process.stdout.write(msg + '\n')
     # }}}
 
+    stack_trace: () -> # {{{
+        currentFunction = arguments.callee.caller
+        while (currentFunction)
+            fn = currentFunction.toString()
+            this.log(fn)
+            currentFunction = currentFunction.caller
+
+    # }}}
+
     window_scroll_pos: (win=window) -> # {{{
         # The current scroll position of the browser window
         if typeof(win.pageXOffset) == 'number'

src/calibre/gui2/viewer/documentview.py

@@ -460,6 +460,29 @@ class Document(QWebPage):  # {{{
                 self.scroll_to(x=self.xpos, y=npos)
         return property(fget=fget, fset=fset)
 
+    @dynamic_property
+    def page_number(self):
+        ' The page number is the number of the page at the left most edge of the screen (starting from 0) '
+        def fget(self):
+            if self.in_paged_mode:
+                return self.javascript(
+                    'ans = 0; if (window.paged_display) ans = window.paged_display.column_boundaries()[0]; ans;', typ='int')
+        def fset(self, val):
+            if self.in_paged_mode and self.loaded_javascript:
+                self.javascript('if (window.paged_display) window.paged_display.scroll_to_column(%d)' % int(val))
+                return True
+        return property(fget=fget, fset=fset)
+
+    @property
+    def page_dimensions(self):
+        if self.in_paged_mode:
+            return self.javascript(
+                '''
+                ans = ''
+                if (window.paged_display)
+                    ans = window.paged_display.col_width + ':' + window.paged_display.current_page_height;
+                ans;''', typ='string')
+
     @property
     def hscroll_fraction(self):
         try: