From e61a1c1b10171a04a6cc9b8759bee78c2a873f8b Mon Sep 17 00:00:00 2001
From: Gonzalo Odiard <godiard@sugarlabs.org>
Date: Fri, 25 Feb 2011 21:04:31 +0000
Subject: Highligh of spoken word in epub backend implemented.

Is not working right  - Temporary Patch
---
diff --git a/epubadapter.py b/epubadapter.py
index ab6eb01..38a9991 100644
--- a/epubadapter.py
+++ b/epubadapter.py
@@ -83,6 +83,7 @@ class EpubViewer(epubview.EpubView):
 
     def highlight_next_word(self,  word_count):
         self.current_word = word_count
+        self._view.highlight_next_word()
         return True
 
     def connect_zoom_handler(self, handler):
diff --git a/epubview/epubview.py b/epubview/epubview.py
index 4d3a130..5dccad0 100644
--- a/epubview/epubview.py
+++ b/epubview/epubview.py
@@ -541,6 +541,13 @@ class _View(gtk.HBox):
         filename = self._paginator.get_file_for_pageno(pageno)
         if filename != self._loaded_filename:
             #self._loaded_filename = filename
+
+            # Copy javascript to highligth text to speech
+            destpath, destname = os.path.split(filename.replace('file://', ''))
+            shutil.copy('./epubview/highlight_words.js', destpath)
+            self._insert_js_reference(filename.replace('file://', ''),
+                    destpath)
+
             if filename.endswith('xml'):
                 dest = filename.replace('xml', 'xhtml')
                 shutil.copy(filename.replace('file://', ''),
@@ -551,6 +558,16 @@ class _View(gtk.HBox):
         else:
             self._scroll_page()
 
+    def _insert_js_reference(self, file_name, path):
+        js_reference = '<script type="text/javascript" ' + \
+                'src="./highlight_words.js"></script>'
+        o = open(file_name + '.tmp', 'a')
+        for line in open(file_name):
+            line = line.replace('</head>', js_reference + '</head>')
+            o.write(line + "\n")
+        o.close()
+        shutil.copy(file_name + '.tmp', file_name)
+
     def _load_next_file(self):
         if self._loaded_page == self._pagecount:
             return
diff --git a/epubview/highlight_words.js b/epubview/highlight_words.js
new file mode 100644
index 0000000..ffa5e9a
--- /dev/null
+++ b/epubview/highlight_words.js
@@ -0,0 +1,89 @@
+    var parentElement;
+    var actualChild;
+    var actualWord;
+    var words;
+    var originalNode = null;
+    var modifiedNode = null;
+
+    function trim(s) { 
+      s =  ( s || '' ).replace( /^\s+|\s+$/g, '' ); 
+      return s.replace(/[\n\r\t]/g,' ');
+    }
+
+
+    function init() {
+        parentElement = document.getElementsByTagName("body")[0];
+        actualChild = new Array();
+        actualWord = 0;
+        actualChild.push(0);
+    }
+
+    function highLightNextWordInt() {
+        var nodeList = parentElement.childNodes;
+        ini_posi = actualChild[actualChild.length - 1];
+        for (var i=ini_posi; i < nodeList.length; i++) {
+            var node = nodeList[i];            
+            if ((node.nodeName == "#text") && (trim(node.nodeValue) != '')) {
+                node_text =  trim(node.nodeValue);
+                words = node_text.split(" ");
+                if (actualWord < words.length) {
+                    originalNode = document.createTextNode(node.nodeValue);
+                    
+                    prev_text = '';
+                    for (var p1 = 0; p1 < actualWord; p1++) {
+                        prev_text = prev_text + words[p1] + " ";
+                    }
+                    var textNode1 = document.createTextNode(prev_text);
+                    var textNode2 = document.createTextNode(words[actualWord]+" ");
+                    post_text = '';
+                    for (var p2 = actualWord + 1; p2 < words.length; p2++) {
+                        post_text = post_text + words[p2] + " ";
+                    }
+                    var textNode3 = document.createTextNode(post_text);
+                    var newParagraph = document.createElement('p');
+                    var boldNode = document.createElement('b');
+                    boldNode.appendChild(textNode2);
+                    newParagraph.appendChild(textNode1);    
+                    newParagraph.appendChild(boldNode);    
+                    newParagraph.appendChild(textNode3);    
+
+                    parentElement.insertBefore(newParagraph, node);
+                    parentElement.removeChild(node);
+                    modifiedNode = newParagraph;
+
+                    actualWord = actualWord + 1;
+                    if (actualWord >=  words.length) {
+                        actualChild.pop();
+                        actualChild[actualChild.length - 1] = actualChild[actualChild.length - 1] + 2;
+                        actualWord = 0;
+                        parentElement = parentElement.parentNode;
+                    }
+                }    
+                throw "exit"; 
+            } else {
+                if (node.childNodes.length > 0) {
+                    parentElement = node;
+                    actualChild.push(0);
+                    actualWord = 0;
+                    highLightNextWordInt();
+                    actualChild.pop();
+                }
+            }
+        }
+        return;
+    }
+
+
+    function highLightNextWord() {
+        if (typeof parentElement  == "undefined") {
+            init();
+        }
+        if (originalNode != null) {
+            modifiedNode.parentNode.insertBefore(originalNode, modifiedNode);
+            modifiedNode.parentNode.removeChild(modifiedNode);
+        } 
+        try {
+            highLightNextWordInt();
+        } catch(er) {
+        }
+    }
diff --git a/epubview/widgets.py b/epubview/widgets.py
index 078ae3b..7af4f31 100644
--- a/epubview/widgets.py
+++ b/epubview/widgets.py
@@ -34,3 +34,9 @@ class _WebView(webkit.WebView):
         'newdiv.style.height = "%dpx";document.body.appendChild(newdiv);' \
         % incr)
         self.execute_script(js)
+
+    def highlight_next_word(self):
+        '''
+        Highlight next word (for text to speech)
+        '''
+        self.execute_script('highLightNextWord();')
--
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