1 files changed, 13 insertions, 0 deletions
diff --git a/src/gui_htmlattrtext.hh b/src/gui_htmlattrtext.hh
index 91e1cc1..96b0447 100644
--- a/src/gui_htmlattrtext.hh
+++ b/src/gui_htmlattrtext.hh
@@ -7,10 +7,23 @@
 
 class HtmlAttributedText : public AttributedText {
 public:
+  class Listener {
+  public:
+    virtual ~Listener() {}
+
+    virtual void changed(HtmlAttributedText* text) = 0;
+
+  protected:
+    Listener() {}
+  };
+
   static HtmlAttributedText* create();
 
   virtual std::string html() const = 0;
 
+  virtual void add_listener(Listener* listener) = 0;
+  virtual void remove_listener(Listener* listener) = 0;
+
 protected:
   HtmlAttributedText() {}
 };