E-book viewer: When using the tap and hold gesture on a touchscreen, …

…allow lookup of the word currently under the finger in the dictionary or online. Fixes #1318242 [Enhancement: allow text select on Windows Tablet, perhaps with stylus](https://bugs.launchpad.net/calibre/+bug/1318242)

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

@@ -103,6 +103,22 @@ class CalibreUtils
         return this.viewport_to_document(r.top, 0, elem.ownerDocument)[0]
     # }}}
 
+    word_at_point: (x, y) -> # {{{
+        # Return the word at the specified point (in viewport co-ordinates)
+        range = if document.caretPositionFromPoint then document.caretPositionFromPoint(x, y) else document.caretRangeFromPoint(x, y)
+        if range == null
+            return null
+        node = range.startContainer
+        if node.nodeType != Node.TEXT_NODE
+            return null
+        offset = range.startOffset
+        range = document.createRange()
+        range.selectNodeContents(node)
+        range.setStart(node, offset)
+        range.setEnd(node, offset+1)
+        range.expand('word')
+        return range.toString()
+    # }}}
 
 if window?
     window.calibre_utils = new CalibreUtils()

src/calibre/gui2/viewer/documentview.py

@@ -364,10 +364,7 @@ def javascript(self, string, typ=None):
         return ans
 
     def javaScriptConsoleMessage(self, msg, lineno, msgid):
-        if self.debug_javascript:
-            prints(msg)
-        else:
-            return QWebPage.javaScriptConsoleMessage(self, msg, lineno, msgid)
+        prints(msg)
 
     def javaScriptAlert(self, frame, msg):
         if self.debug_javascript:
@@ -681,6 +678,12 @@ def contextMenuEvent(self, ev):
                 ac = getattr(self, '%s_action' % x)
                 menu.addAction(ac.icon(), '%s [%s]' % (unicode(ac.text()), ','.join(self.shortcuts.get_shortcuts(sc))), ac.trigger)
 
+        if from_touch and self.manager is not None:
+            word = unicode(mf.evaluateJavaScript('window.calibre_utils.word_at_point(%f, %f)' % (ev.pos().x(), ev.pos().y())).toString())
+            if word:
+                menu.addAction(self.dictionary_action.icon(), _('Lookup %s in the dictionary') % word, partial(self.manager.lookup, word))
+                menu.addAction(self.search_online_action.icon(), _('Search for %s online') % word, partial(self.do_search_online, word))
+
         if not text and img.isNull():
             menu.addSeparator()
             if self.manager.action_back.isEnabled():
@@ -748,8 +751,11 @@ def search_next(self):
     def search_online(self):
         t = unicode(self.selectedText()).strip()
         if t:
-            url = 'https://www.google.com/search?q=' + QUrl().toPercentEncoding(t)
-            open_url(QUrl.fromEncoded(url))
+            self.do_search_online(t)
+
+    def do_search_online(self, text):
+        url = 'https://www.google.com/search?q=' + QUrl().toPercentEncoding(text)
+        open_url(QUrl.fromEncoded(url))
 
     def set_manager(self, manager):
         self.manager = manager