Feat: Add Status Bar with Progress Bar for Load on Save operations

src/teletext/io.py

@@ -1,10 +1,15 @@
 import os
-from typing import List
+from typing import List, Callable, Optional
 from .models import Packet, Page, TeletextService
 
-def load_t42(file_path: str) -> TeletextService:
+def load_t42(file_path: str, progress_callback: Optional[Callable[[int, int], None]] = None) -> TeletextService:
     service = TeletextService()
     
+    total_bytes = os.path.getsize(file_path)
+    # Each packet is 42 bytes
+    total_packets = total_bytes // 42
+    processed_packets = 0
+    
     with open(file_path, 'rb') as f:
         while True:
             chunk = f.read(42)
@@ -14,6 +19,10 @@ def load_t42(file_path: str) -> TeletextService:
                 # Should not happen in a valid T42 stream, or we just ignore incomplete tail
                 break
             
+            processed_packets += 1
+            if progress_callback and processed_packets % 100 == 0:
+                progress_callback(processed_packets, total_packets)
+                
             packet = Packet(chunk)
             service.all_packets.append(packet)
             
@@ -114,9 +123,16 @@ def decode_packet_header(b1, b2):
     row = (d2 << 1) | ((d1 >> 3) & 1)
     return mag, row
 
-def save_t42(file_path: str, service: TeletextService):
+def save_t42(file_path: str, service: TeletextService, progress_callback: Optional[Callable[[int, int], None]] = None):
+    total_packets = len(service.all_packets)
+    processed = 0
+    
     with open(file_path, 'wb') as f:
         for packet in service.all_packets:
+            processed += 1
+            if progress_callback and processed % 100 == 0:
+                progress_callback(processed, total_packets)
+
             # Check if we can reuse the original header (preserving parity/integrity)
             use_original_header = False
             

src/teletext/ui.py

@@ -1,6 +1,9 @@
 
-from PyQt6.QtWidgets import (QMainWindow, QWidget, QVBoxLayout, QHBoxLayout, 
-                             QListWidget, QListWidgetItem, QComboBox, QLabel, QLineEdit, QPushButton, QFileDialog, QMenuBar, QMenu, QMessageBox)
+from PyQt6.QtWidgets import (
+    QMainWindow, QWidget, QVBoxLayout, QHBoxLayout, 
+    QListWidget, QListWidgetItem, QComboBox, QLabel, QLineEdit, QPushButton, 
+    QFileDialog, QMenuBar, QMenu, QMessageBox, QStatusBar, QProgressBar, QApplication
+)
 
 # ... (imports remain)
 
@@ -10,6 +13,8 @@ from PyQt6.QtCore import Qt
 
 from .io import load_t42, save_t42
 from .renderer import TeletextCanvas
+import sys
+import os
 from .models import TeletextService, Page, Packet
 
 class MainWindow(QMainWindow):
@@ -170,6 +175,7 @@ class MainWindow(QMainWindow):
         # Reset everything
         self.service = TeletextService()
         self.current_page = None
+        self.current_file_path = None
         self.populate_list()
         self.subpage_combo.clear()
         self.page_groups = {}
@@ -178,25 +184,48 @@ class MainWindow(QMainWindow):
         # Maybe reset text of hex input
         self.hex_input.clear()
         QMessageBox.information(self, "Closed", "File closed.")
+        self.status_label.setText("Ready")
 
     def open_file(self):
         fname, _ = QFileDialog.getOpenFileName(self, "Open T42", "", "Teletext Files (*.t42);;All Files (*)")
         if fname:
             try:
-                self.service = load_t42(fname)
+                self.progress_bar.setVisible(True)
+                self.status_label.setText(f"Loading {os.path.basename(fname)}...")
+                self.progress_bar.setValue(0)
+                
+                self.service = load_t42(fname, progress_callback=self.update_progress)
+                self.current_file_path = fname
                 self.populate_list()
-                QMessageBox.information(self, "Loaded", f"Loaded {len(self.service.pages)} pages.")
+                
+                self.progress_bar.setVisible(False)
+                self.status_label.setText(f"Loaded {len(self.service.pages)} pages from {os.path.basename(fname)}")
             except Exception as e:
+                self.progress_bar.setVisible(False)
                 QMessageBox.critical(self, "Error", f"Failed to load file: {e}")
+                self.status_label.setText("Error loading file")
 
     def save_file(self):
-        fname, _ = QFileDialog.getSaveFileName(self, "Save T42", "", "Teletext Files (*.t42);;All Files (*)")
-        if fname:
-            try:
-                save_t42(fname, self.service)
-                QMessageBox.information(self, "Saved", "File saved successfully.")
-            except Exception as e:
-                QMessageBox.critical(self, "Error", f"Failed to save file: {e}")
+        if not self.current_file_path:
+             # Logic for "Save As" if path not known, but for T42 we usually overwrite or ask. 
+             # To keep it simple, ask every time or track path. 
+             # Let's ask.
+             fname, _ = QFileDialog.getSaveFileName(self, "Save T42", "", "Teletext Files (*.t42)")
+             if not fname: return
+             self.current_file_path = fname
+        
+        try:
+            self.progress_bar.setVisible(True)
+            self.status_label.setText(f"Saving {os.path.basename(self.current_file_path)}...")
+            
+            save_t42(self.current_file_path, self.service, progress_callback=self.update_progress)
+            
+            self.progress_bar.setVisible(False)
+            self.status_label.setText(f"Saved {len(self.service.pages)} pages to {os.path.basename(self.current_file_path)}")
+        except Exception as e:
+            self.progress_bar.setVisible(False)
+            QMessageBox.critical(self, "Error", f"Failed to save file: {e}")
+            self.status_label.setText("Error saving file")
 
     def populate_list(self):
         self.page_list.clear()