Add debounced text change handling and modified file indicator for tabs

- Debounce word completer refresh with 1500ms timeout to reduce overhead
- Add visual indicator (file-changed class) for modified files in tabs
- Refactor buffer switching into signal_mapper for DRY code
- Fix handler ID indices after adding _after_changed signal
- Move set_modified(False) after successful file write in save()

plugins/code/completers/words_completer/provider_response_cache.py

@@ -20,6 +20,7 @@ class ProviderResponseCache(ProviderResponseCacheBase):
         super(ProviderResponseCache, self).__init__()
 
         self.matchers: dict = {}
+        self._temp_timeout_id: int = None
 
 
     def process_file_load(self, event: Code_Event_Types.AddedNewFileEvent):
@@ -36,9 +37,22 @@ class ProviderResponseCache(ProviderResponseCacheBase):
 
     def process_file_change(self, event: Code_Event_Types.TextChangedEvent):
         buffer = event.file.buffer
+        self._clear_temp_delay()
+        self._set_temp_delay(buffer)
+
+    def _clear_temp_delay(self):
+        if self._temp_timeout_id:
+            GLib.source_remove(self._temp_timeout_id)
+
+    def _set_temp_delay(self, buffer):
+        def run_refresh_update(buffer):
             with ThreadPoolExecutor(max_workers = 1) as executor:
                 executor.submit(self._handle_change, buffer)
 
+            return False
+
+        self._temp_timeout_id = GLib.timeout_add(1500, run_refresh_update, buffer)
+
     def _handle_change(self, buffer):
         start_itr = buffer.get_start_iter()
         end_itr   = buffer.get_end_iter()

src/core/widgets/code/controllers/tabs_controller.py

@@ -26,11 +26,11 @@ class TabsController(ControllerBase):
 
     def _controller_message(self, event: Code_Event_Types.CodeEvent):
         if isinstance(event, Code_Event_Types.FocusedViewEvent):
-            self.tabs_widget.view_changed(
+            self.tabs_widget.view_changed( event.view.get_buffer() )
-                event.view.get_buffer()
-            )
         elif isinstance(event, Code_Event_Types.FilePathSetEvent):
             self.update_tab_label(event)
+        elif isinstance(event, Code_Event_Types.ModifiedChangedEvent):
+            self.tabs_widget.modified_changed( event.buffer )
         elif isinstance(event, Code_Event_Types.AddedNewFileEvent):
             self.add_tab(event)
         elif isinstance(event, Code_Event_Types.PoppedFileEvent):

src/core/widgets/code/controllers/views/signal_mapper.py

@@ -18,6 +18,10 @@ class SourceViewSignalMapper:
     def set_state_manager(self, state_manager):
         self.state_manager = state_manager
 
+    def set_buffer_to_active_view(self, buffer):
+            self.active_view.set_buffer(buffer)
+            self.active_view.command.exec("update_info_bar")
+
     def connect_signals(self, source_view: SourceView):
         signal_mappings = self._get_signal_mappings()
         for signal, handler in signal_mappings.items():

src/core/widgets/code/controllers/views/source_views_controller.py

@@ -28,17 +28,14 @@ class SourceViewsController(ControllerBase, list):
         if isinstance(event, Code_Event_Types.RemovedFileEvent):
             self._remove_file(event)
         elif isinstance(event, Code_Event_Types.RegisterCommandEvent):
-            self. _register_command(event)
+            self._register_command(event)
 
         if not self.signal_mapper.active_view: return
 
         if isinstance(event, Code_Event_Types.TextChangedEvent):
-            if not self.signal_mapper.active_view: return
             self.signal_mapper.active_view.command.exec("update_info_bar")
         elif isinstance(event, Code_Event_Types.SetActiveFileEvent):
-            self.signal_mapper.active_view.set_buffer(
+            self.signal_mapper.set_buffer_to_active_view(event.buffer)
-                event.buffer
-            )
         elif isinstance(event, Code_Event_Types.TextInsertedEvent):
             self.signal_mapper.insert_text(event.file, event.text)
 

src/core/widgets/code/source_buffer.py

@@ -26,6 +26,7 @@ class SourceBuffer(GtkSource.Buffer):
     def set_signals(
         self,
         _changed,
+        _after_changed,
         _mark_set,
         _insert_text,
         _after_insert_text,
@@ -34,6 +35,7 @@ class SourceBuffer(GtkSource.Buffer):
 
         self._handler_ids = [
             self.connect("changed",           _changed),
+            self.connect_after("changed",     _after_changed),
             self.connect("mark-set",          _mark_set),
             self.connect("insert-text",       _insert_text),
             self.connect_after("insert-text", _after_insert_text),
@@ -43,20 +45,26 @@ class SourceBuffer(GtkSource.Buffer):
     def block_changed_signal(self):
         self.handler_block(self._handler_ids[0])
 
+    def block_changed_after_signal(self):
+        self.handler_block(self._handler_ids[1])
+
     def block_insert_after_signal(self):
-        self.handler_block(self._handler_ids[3])
+        self.handler_block(self._handler_ids[4])
 
     def block_modified_changed_signal(self):
-        self.handler_block(self._handler_ids[4])
+        self.handler_block(self._handler_ids[5])
 
     def unblock_changed_signal(self):
         self.handler_unblock(self._handler_ids[0])
 
+    def unblock_changed_after_signal(self):
+        self.handler_unblock(self._handler_ids[1])
+
     def unblock_insert_after_signal(self):
-        self.handler_unblock(self._handler_ids[3])
+        self.handler_unblock(self._handler_ids[4])
 
     def unblock_modified_changed_signal(self):
-        self.handler_unblock(self._handler_ids[4])
+        self.handler_unblock(self._handler_ids[5])
 
     def clear_signals(self):
         for handle_id in self._handler_ids:

src/core/widgets/code/source_file.py

@@ -27,7 +27,6 @@ class SourceFile(GtkSource.File):
         self.fname: str           = "buffer"
         self.fpath: str           = "buffer"
         self.ftype: str           = "buffer"
-
         self.buffer: SourceBuffer = SourceBuffer()
 
         self._set_signals()
@@ -36,6 +35,7 @@ class SourceFile(GtkSource.File):
     def _set_signals(self):
         self.buffer.set_signals(
             self._changed,
+            self._after_changed,
             self._mark_set,
             self._insert_text,
             self._after_insert_text,
@@ -43,6 +43,9 @@ class SourceFile(GtkSource.File):
         )
 
     def _changed(self, buffer: SourceBuffer):
+        ...
+
+    def _after_changed(self, buffer: SourceBuffer):
         self.check_file_on_disk()
 
         event = Event_Factory.create_event(
@@ -53,7 +56,7 @@ class SourceFile(GtkSource.File):
         self.emit(event)
 
         if self.is_deleted():
-            print("deleted")
+            print("is_deleted")
             # event = Event_Factory.create_event("file_deleted", buffer = buffer)
             # event.file = self
             # self.emit(event)
@@ -138,6 +141,7 @@ class SourceFile(GtkSource.File):
         undo_manager.begin_not_undoable_action()
         self.buffer.insert_at_cursor(data)
         undo_manager.end_not_undoable_action()
+        self.buffer.set_modified(False)
 
     def set_path(self, gfile: Gio.File):
         if not gfile: return
@@ -150,13 +154,15 @@ class SourceFile(GtkSource.File):
         self.emit(event)
 
     def save(self):
+        self._write_file( self.get_location() )
+
+        self.buffer.set_modified(False)
         event = Event_Factory.create_event(
             "saved_file",
             file = self, buffer = self.buffer
         )
 
         self.emit(event)
-        self._write_file( self.get_location() )
 
     def save_as(self):
         file = event_system.emit_and_await("save-file-dialog")

src/core/widgets/code/tabs_widget.py

@@ -65,19 +65,6 @@ class TabsWidget(Gtk.Notebook):
 
         self.message(event)
 
-    def view_changed(self, buffer):
-        for page_widget in self.get_children():
-            tab = self.get_tab_label(page_widget)
-            if not buffer == tab.file.buffer: continue
-
-            self.handler_block(self.switch_page_id)
-
-            self.set_current_page(
-                self.page_num(page_widget)
-            )
-
-            self.handler_unblock(self.switch_page_id)
-
     def _bind_tab_menu(self, tab, page_widget):
         def do_context_menu(tab, eve, page_widget):
             if eve.type == Gdk.EventType.BUTTON_RELEASE and eve.button == 3: # r-click
@@ -116,6 +103,29 @@ class TabsWidget(Gtk.Notebook):
 
         return context_menu
 
+    def view_changed(self, buffer):
+        for page_widget in self.get_children():
+            tab = self.get_tab_label(page_widget)
+            if not buffer == tab.file.buffer: continue
+
+            self.handler_block(self.switch_page_id)
+
+            self.set_current_page(
+                self.page_num(page_widget)
+            )
+
+            self.handler_unblock(self.switch_page_id)
+
+    def modified_changed(self, buffer):
+        for page_widget in self.get_children():
+            tab = self.get_tab_label(page_widget)
+            if not buffer == tab.file.buffer: continue
+
+            ctx = tab.label.get_style_context()
+            if buffer.get_modified():
+                ctx.add_class("file-changed")
+            else:
+                ctx.remove_class("file-changed")
 
     def close_item(self, menu_item, page_widget):
         tab = self.get_tab_label(page_widget)