1 files changed, 22 insertions, 0 deletions
diff --git a/src/gui_htmlattrtext.cc b/src/gui_htmlattrtext.cc
index ceaeba8..453d550 100644
--- a/src/gui_htmlattrtext.cc
+++ b/src/gui_htmlattrtext.cc
@@ -8,6 +8,7 @@
 #include <vector>
 
 #include "gui_htmlattrtext.hh"
+#include "observers.hh"
 
 namespace {
 
@@ -73,6 +74,7 @@ public:
     auto offset = text_.size();
     text_.append(str + start, length);
     if (attr != EMPTY) ranges_.emplace_back(attr, offset, offset + length);
+    notify_changed();
   }
 
   void add(Attribute const& attr, size_t start, size_t length) override {
@@ -83,9 +85,11 @@ public:
     auto it = std::lower_bound(ranges_.begin(), ranges_.end(), r);
     if (it != ranges_.end() && it->start_ == r.start_ && it->end_ == r.end_) {
       it->attr_.add(r.attr_);
+      notify_changed();
       return;
     }
     ranges_.insert(it, r);
+    notify_changed();
   }
   void set(Attribute const& attr, size_t start, size_t length) override {
     clear(start, length);
@@ -117,6 +121,7 @@ public:
       }
       ++it;
     }
+    notify_changed();
   }
 
   std::string html() const override {
@@ -163,6 +168,15 @@ public:
   void reset() override {
     text_.clear();
     ranges_.clear();
+    notify_changed();
+  }
+
+  void add_listener(Listener* listener) override {
+    observers_.insert(listener);
+  }
+
+  void remove_listener(Listener* listener) override {
+    observers_.erase(listener);
   }
 
 private:
@@ -188,6 +202,13 @@ private:
     return start + length;
   }
 
+  void notify_changed() {
+    auto it = observers_.notify();
+    while (it.has_next()) {
+      it.next()->changed(this);
+    }
+  }
+
   static void start_tag(std::string* out, Attribute const& attr) {
     out->append("<span style=\"");
     if (attr.bold()) out->append("font-weight: bold; ");
@@ -213,6 +234,7 @@ private:
 
   std::string text_;
   std::vector<Range> ranges_;
+  Observers<Listener*> observers_;
 };
 
 }  // namespace