start implemting back and forward in history

Signed-off-by: Mirko Lindner <mirko@sharism.cc>

src/main_window.cc

@@ -39,6 +39,7 @@ main_window::main_window()
 bool main_window::actions(int key)
 {
     static int key_b = 98;
+    static int key_f = 102;
     static int key_h = 104;
     static int key_q = 113;
     static int key_r = 114;
@@ -63,6 +64,10 @@ bool main_window::actions(int key)
         GoToTop();
     }else if(key == key_h){
         show_history();
+    }else if(key == key_f){
+        history_jump(1);
+    }else if(key == key_b){
+        history_jump(-1);
     }else{
       log_debug("key pressed: " << key);
     }

src/vido.cc

@@ -48,7 +48,8 @@ main_window *window;
 Gtk::Widget *html;
 GtkWidget *html_wg;
 std::vector < std::pair< std::string, std::string > > history;
-
+unsigned int position = 0;
+bool historyCall = false;
 
 // // // misc functions
 // get zimFile, if not already opened, open file
@@ -75,18 +76,30 @@ void show_message(std::string title, std::string txt)
 // fill gtkhtml widget with new content
 //TODO prepend "top" anchor on html
 void fill_gtkhtml(std::string& html, std::string url, std::string title){
-    log_debug("fill gtkhtml called");
+    log_debug("fill gtkhtml called with " << url << " and " << title);
     std::string ccontent;
     ccontent = "<a name=\"top\"></a>" + html;
     gtk_html_flush(GTK_HTML(html_wg));
     gtk_html_load_from_string(GTK_HTML(html_wg), ccontent.c_str(), -1);
     
     if ((url != "") && title != ""){
+      if (position == 0){
         log_debug("adding " << title << " to history");
         history.push_back( std::make_pair( url, title ) );
         if (history.size() == 11){
           history.erase(history.begin());
           }
+      }else{
+        if (!historyCall){
+          log_debug("clearing history");
+          std::vector < std::pair< std::string, std::string > >::iterator iterator = history.begin();
+          for (int m=0; m < position; m++){
+            history.erase(iterator+m);
+            }
+        }else{
+          historyCall = false;
+        }
+      }
       
     }
     
@@ -97,13 +110,17 @@ void show_history()
   std::string res, url, title;
   res += "<ul style=\"list-style-type:none;\">";
 
-  for(unsigned i=history.size(); i > 0; --i)
+  for(unsigned i=history.size()-1; i > 0; --i)
   {
     
 #if HAVE_ZIM_QUNICODE_H
-    res += "<li><a href=" + history[i-1].first + ">" + history[i-1].second + "</a></li>";
+    res += "<li><a href=" + history[i].first + ">" + history[i].second + "</a></li>";
 #else
-    res += "<li><a href='" + history[i-1].first + "'>" + history[i-1].second + "</a></li>";
+    res += "<li><a href='" + history[i].first + "'>" + history[i].second + "</a>";
+    if (position == i){
+      res += "<--";
+    }
+    res += "</li>";
 #endif
     
   }
@@ -115,6 +132,24 @@ void show_history()
   
 }
 
+void history_jump(int jumper){
+  int new_rel_pos = position + jumper;
+  log_debug("new_rel_pos = " << new_rel_pos);
+  int new_pos = history.size() + new_rel_pos;
+  log_debug("new_pos = " << new_pos);
+  log_debug("history size = " << history.size());
+  if ((new_pos > 0) && (new_pos <= history.size())){
+    historyCall = true;
+    std::string url = history[new_pos-1].first;
+    log_debug("url is = " << url);
+//     const char* uri =  url.c_str();
+//     getArticleFromUrl(const_cast<char*>(url.c_str()), 1);
+    const char* uri = url.c_str();
+    getArticleFromUrl(uri, 0);
+    position = new_rel_pos;
+  }
+}
+
 //UNUSED
 // // copy article html from while loop into global variable
 // void set_article(const std::string& txt)
@@ -148,7 +183,7 @@ void show_random()
     log_debug("article size=" << res.size());
     log_debug("article title=" << article.getTitle());
     log_debug("article namespace=" << article.getNamespace());
-    
+    position = 0;
     fill_gtkhtml(res, article.getUrl(), article.getTitle());
 }
 
@@ -170,7 +205,7 @@ void GoToTop()
 
 // // set displayed html to given url
 // // FIXME: returns several articles and displays on one page ... why?
-void getArticleFromUrl(const gchar *url)
+void getArticleFromUrl(const gchar *url, int pos = 0)
 {
     // TODO unescape url
 
@@ -221,7 +256,9 @@ void getArticleFromUrl(const gchar *url)
         if (article.good())  // check if article is really found
         {
             content = article.getPage();
-
+            if (pos == 0){
+              position = 0;
+            }
             fill_gtkhtml(content, article.getUrl(), article.getTitle());
         }
         else
@@ -247,9 +284,7 @@ void getArticleFromTitle(const gchar *phrase)
     zim::Search::Results result;
     zim::Search search(z);
     std::string term(phrase);
-    std::string res;
-    std::string url;
-    std::string title;
+    std::string res, url, title;
     search.setSearchLimit(25);
     search.find(result, ns, term);
     if( result.size() == 0)
@@ -272,6 +307,7 @@ void getArticleFromTitle(const gchar *phrase)
         res = article.getPage(false, 10);
         url = article.getUrl();
         title = article.getTitle();
+        position = 0;
       }
       else
       {
@@ -311,11 +347,12 @@ bool on_link_clicked(GtkHTML *html, const gchar *url)
       }else{
         term = term.substr(0, found);   
         //TODO make "set_html" func accept anchor name
-        getArticleFromUrl(const_cast<char*>(term.c_str()));
+        const char* uri = term.c_str();
+        getArticleFromUrl(uri, 0);
       }
       
     }else{
-      getArticleFromUrl(url);
+      getArticleFromUrl(url,0);
     }
     
     return true;

src/vido.hh

@@ -27,8 +27,9 @@ class main_window;
 
 extern void show_random();
 extern void show_history();
+extern void history_jump(int jumper);
 extern void search_window(main_window *window);
-extern void getArticleFromUrl(const gchar *url);
+extern void getArticleFromUrl(const gchar *url, int pos);
 extern void getArticleFromTitle(const gchar *url);
 extern void GoToTop();