window: translate_selection: Only get clipboard when window is active

Fixes #407

dialect/main.py

@@ -118,7 +118,7 @@ def process_command_line(self):
 
         if self.window is not None:
             if not text and selection:
-                self.window.translate_selection(langs["src"], langs["dest"])
+                self.window.queue_selection_translation(langs["src"], langs["dest"])
             elif text:
                 self.window.translate(text, langs["src"], langs["dest"])
 

dialect/window.blp

@@ -44,6 +44,8 @@ template $DialectWindow : Adw.ApplicationWindow {
   height-request: 320;
   focus-widget: src_text;
 
+  notify::is-active => $_on_is_active_changed();
+
   Adw.Breakpoint {
     condition ("max-width: 680px")
     setters {

dialect/window.py

@@ -46,6 +46,7 @@ class DialectWindow(Adw.ApplicationWindow):
 
     # Properties
     translator_loading: bool = GObject.Property(type=bool, default=True)  # type: ignore
+    selection_translation_queued: bool = GObject.Property(type=bool, default=False)  # type: ignore
 
     # Child widgets
     menu_btn: Gtk.MenuButton = Gtk.Template.Child()  # type: ignore
@@ -105,6 +106,7 @@ class DialectWindow(Adw.ApplicationWindow):
     current_history = 0  # for history management
 
     # Translation-related variables
+    selection_translation_langs: tuple[str | None, str | None] = (None, None)
     next_translation: TranslationRequest | None = None  # for ongoing translation
     translation_loading = False  # for ongoing translation
 
@@ -511,8 +513,20 @@ async def translate_selection(self, src_lang: str | None, dest_lang: str | None)
         """Runs `translate` with the selection clipboard text"""
         if display := Gdk.Display.get_default():
             clipboard = display.get_primary_clipboard()
-            if text := await clipboard.read_text_async():  # type: ignore
-                self.translate(text, src_lang, dest_lang)
+            try:
+                if text := await clipboard.read_text_async():  # type: ignore
+                    self.translate(text, src_lang, dest_lang)
+            except GLib.Error as exc:
+                logging.error(exc)
+                self.send_notification(_("Couldn’t read selection clip board!"))
+
+    def queue_selection_translation(self, src_lang: str | None, dest_lang: str | None):
+        """Call `translate_selection` or queue it until the window is focused"""
+        if self.props.is_active:
+            self.translate_selection(src_lang, dest_lang)
+        else:
+            self.selection_translation_queued = True
+            self.selection_translation_langs = (src_lang, dest_lang)
 
     def save_settings(self, *args, **kwargs):
         if not self.is_maximized():
@@ -932,6 +946,14 @@ def _on_user_action_ended(self, _buffer):
         if Settings.get().live_translation:
             self._on_translation()
 
+    @Gtk.Template.Callback()
+    def _on_is_active_changed(self, *_args):
+        if self.selection_translation_queued and self.props.is_active:
+            src, dest = self.selection_translation_langs
+            self.selection_translation_queued = False
+            self.selection_translation_langs = (None, None)
+            self.translate_selection(src, dest)
+
     @Gtk.Template.Callback()
     def _on_retry_load_translator_clicked(self, *_args):
         self.reload_provider("translator")