fix: preview panel + main window fixes and optimizations (#700)

* fix: only update file preview when necessary

* fix: don't update thumb from tag_box callbacks

* fix: reset preview panel and filters when loading new library

* fix: clear library state on close; close old library on open

* fix: reset scrollbar position on library close

tagstudio/src/qt/modals/folders_to_tags.py

@@ -226,7 +226,7 @@ class FoldersToTagsModal(QWidget):
     def on_apply(self, event):
         folders_to_tags(self.library)
         self.close()
-        self.driver.preview_panel.update_widgets()
+        self.driver.preview_panel.update_widgets(update_preview=False)
 
     def on_open(self, event):
         for i in reversed(range(self.scroll_layout.count())):

tagstudio/src/qt/ts_qt.py

@@ -463,7 +463,7 @@ class QtDriver(DriverMixin, QObject):
         self.autofill_action.triggered.connect(
             lambda: (
                 self.run_macros(MacroID.AUTOFILL, self.selected),
-                self.preview_panel.update_widgets(),
+                self.preview_panel.update_widgets(update_preview=False),
             )
         )
         macros_menu.addAction(self.autofill_action)
@@ -638,7 +638,6 @@ class QtDriver(DriverMixin, QObject):
         self.main_window.pagination.index.connect(lambda i: self.page_move(page_id=i))
 
         self.splash.finish(self.main_window)
-        self.preview_panel.update_widgets()
 
     def show_grid_filenames(self, value: bool):
         for thumb in self.item_thumbs:
@@ -678,6 +677,13 @@ class QtDriver(DriverMixin, QObject):
         self.settings.setValue(SettingItems.LAST_LIBRARY, str(self.lib.library_dir))
         self.settings.sync()
 
+        # Reset library state
+        self.preview_panel.update_widgets()
+        self.main_window.searchField.setText("")
+        scrollbar: QScrollArea = self.main_window.scrollArea
+        scrollbar.verticalScrollBar().setValue(0)
+        self.filter = FilterState.show_all()
+
         self.lib.close()
 
         self.thumb_job_queue.queue.clear()
@@ -748,7 +754,7 @@ class QtDriver(DriverMixin, QObject):
                 item.thumb_button.set_selected(True)
 
         self.set_macro_menu_viability()
-        self.preview_panel.update_widgets()
+        self.preview_panel.update_widgets(update_preview=False)
 
     def clear_select_action_callback(self):
         self.selected.clear()
@@ -761,7 +767,7 @@ class QtDriver(DriverMixin, QObject):
     def show_tag_database(self):
         self.modal = PanelModal(
             widget=TagDatabasePanel(self.lib),
-            done_callback=self.preview_panel.update_widgets,
+            done_callback=lambda: self.preview_panel.update_widgets(update_preview=False),
             has_save=False,
         )
         Translations.translate_with_setter(self.modal.setTitle, "tag_manager.title")
@@ -1421,6 +1427,9 @@ class QtDriver(DriverMixin, QObject):
         )
         self.main_window.repaint()
 
+        if self.lib.library_dir:
+            self.close_library()
+
         open_status: LibraryStatus = None
         try:
             open_status = self.lib.open_library(path)

tagstudio/src/qt/widgets/item_thumb.py

@@ -502,7 +502,7 @@ class ItemThumb(FlowWidget):
             self.lib.remove_tags_from_entry(entry_id, tag_id)
 
         if self.driver.preview_panel.is_open:
-            self.driver.preview_panel.update_widgets()
+            self.driver.preview_panel.update_widgets(update_preview=False)
 
     def mouseMoveEvent(self, event):  # noqa: N802
         if event.buttons() is not Qt.MouseButton.LeftButton:

tagstudio/src/qt/widgets/preview_panel.py

@@ -131,8 +131,13 @@ class PreviewPanel(QWidget):
         root_layout.addWidget(splitter)
         root_layout.addWidget(add_buttons_container)
 
-    def update_widgets(self) -> bool:
-        """Render the panel widgets with the newest data from the Library."""
+    def update_widgets(self, update_preview: bool = True) -> bool:
+        """Render the panel widgets with the newest data from the Library.
+
+        Args:
+            update_preview(bool): Should the file preview be updated?
+            (Only works with one or more items selected)
+        """
         # No Items Selected
         try:
             if len(self.driver.selected) == 0:
@@ -151,8 +156,9 @@ class PreviewPanel(QWidget):
                 filepath: Path = self.lib.library_dir / entry.path
                 ext: str = filepath.suffix.lower()
 
-                stats: dict = self.thumb.update_preview(filepath, ext)
-                self.file_attrs.update_stats(filepath, ext, stats)
+                if update_preview:
+                    stats: dict = self.thumb.update_preview(filepath, ext)
+                    self.file_attrs.update_stats(filepath, ext, stats)
                 self.file_attrs.update_date_label(filepath)
                 self.fields.update_from_entry(entry_id)
                 self.update_add_tag_button(entry_id)

tagstudio/src/qt/widgets/tag_box.py

@@ -63,7 +63,7 @@ class TagBoxWidget(FieldWidget):
             tag_widget.on_remove.connect(
                 lambda tag_id=tag.id: (
                     self.remove_tag(tag_id),
-                    self.driver.preview_panel.update_widgets(),
+                    self.driver.preview_panel.update_widgets(update_preview=False),
                 )
             )
             tag_widget.on_edit.connect(lambda t=tag: self.edit_tag(t))
@@ -77,7 +77,7 @@ class TagBoxWidget(FieldWidget):
             build_tag_panel,
             tag.name,  # TODO - display name including parent tags
             "Edit Tag",
-            done_callback=self.driver.preview_panel.update_widgets,
+            done_callback=lambda: self.driver.preview_panel.update_widgets(update_preview=False),
             has_save=True,
         )
         # TODO - this was update_tag()