Update label printer GUI with improved preview layout - 50% larger canvas, proportional barcodes, 25 char limit, 0.5cm left margin

label_printer_gui.py

@@ -24,50 +24,145 @@ import cups
 import io
 import os
 import threading
+import tempfile
+import time
 from print_label import create_label_image, print_label_standalone
+from kivy.clock import Clock
 
 # Set window size
 Window.size = (1600, 900)
 
 
-class LabelPreviewWidget(ScatterLayout):
+class LabelPreviewWidget(BoxLayout):
-    """Widget for displaying the label preview"""
+    """Widget for displaying the warehouse identification label preview"""
     
     def __init__(self, **kwargs):
         super().__init__(**kwargs)
-        self.label_image = None
+        self.orientation = 'vertical'
-        self.temp_preview_path = None
+        self.temp_file_path = None
     
-    def update_preview(self, text):
+    def update_preview(self, sap_nr, cantitate, lot_number):
-        """Update the preview with new label image"""
+        """Update preview with label and barcode information"""
-        if text:
+        try:
-            try:
+            # Create label with article info
-                self.label_image = create_label_image(text)
+            label_text = f"{sap_nr}|{cantitate}|{lot_number}"
-                self.display_preview()
+            self.generate_and_display_preview(sap_nr, cantitate, lot_number, label_text)
-            except Exception as e:
+        except Exception as e:
-                print(f"Error creating preview: {e}")
+            print(f"Error updating preview: {e}")
     
-    def display_preview(self):
+    def generate_and_display_preview(self, sap_nr, cantitate, lot_number, barcode_text):
-        """Display the preview image"""
+        """Generate preview showing alternating text and barcode rows"""
-        if self.label_image:
+        from PIL import Image, ImageDraw, ImageFont
-            # Save to temporary file
+        import barcode
-            import tempfile
+        from barcode.writer import ImageWriter
-            if self.temp_preview_path and os.path.exists(self.temp_preview_path):
+        
+        # Canvas dimensions (11.5cm x 8cm) * 1.5 = 17.25cm x 12cm
+        # At 96 DPI: 11.5cm ≈ 435px, 8cm ≈ 303px
+        # Increased by 50%: 652px x 454px
+        canvas_width = 650
+        canvas_height = 450
+        
+        # Left margin: 0.5cm ≈ 19px * 1.5 = 28px
+        left_margin = 28
+        usable_width = canvas_width - left_margin
+        
+        # Create canvas
+        canvas = Image.new('RGB', (canvas_width, canvas_height), 'white')
+        draw = ImageDraw.Draw(canvas)
+        
+        # 6 rows total
+        row_height = canvas_height // 6
+        
+        # Font for text (larger for bigger canvas)
+        try:
+            label_font = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf", 20)
+            value_font = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf", 16)
+        except:
+            label_font = ImageFont.load_default()
+            value_font = ImageFont.load_default()
+        
+        # Row definitions: (label_text, barcode_value, row_index)
+        rows_data = [
+            ("SAP-Nr. Article", sap_nr, 0),
+            (None, sap_nr, 1),  # Barcode row
+            ("Cantitate", cantitate, 2),
+            (None, cantitate, 3),  # Barcode row
+            ("ID rola cablu", lot_number, 4),
+            (None, lot_number, 5),  # Barcode row
+        ]
+        
+        for label_text, value, row_idx in rows_data:
+            row_y = row_idx * row_height
+            
+            # Draw row border
+            draw.rectangle(
+                [(0, row_y), (canvas_width, row_y + row_height)],
+                outline='black',
+                width=1
+            )
+            
+            if label_text:
+                # Text row: show label and value
+                draw.text(
+                    (left_margin + 8, row_y + 8),
+                    f"{label_text}: {value if value else '(empty)'}",
+                    fill='black',
+                    font=label_font
+                )
+            else:
+                # Barcode row
+                if value and value.strip():
+                    try:
+                        # Limit barcode text to 25 characters
+                        barcode_value = str(value)[:25]
+                        
+                        CODE128 = barcode.get_barcode_class('code128')
+                        writer_options = {
+                            "write_text": False,
+                            "module_width": 0.5,
+                            "module_height": 12,  # Smaller height for better fit
+                            "quiet_zone": 2,
+                            "font_size": 0
+                        }
+                        code = CODE128(barcode_value, writer=ImageWriter())
+                        filename = code.save('label_barcode_tmp', options=writer_options)
+                        barcode_img = Image.open(filename)
+                        
+                        # Use standard barcode size, don't resize to fit width
+                        canvas.paste(barcode_img, (left_margin + 4, row_y + 12))
+                    except Exception as e:
+                        print(f"Barcode error: {e}")
+                        draw.text(
+                            (left_margin + 8, row_y + row_height // 2 - 10),
+                            "Barcode: " + str(value)[:25],
+                            fill='black',
+                            font=value_font
+                        )
+                else:
+                    draw.text(
+                        (left_margin + 8, row_y + row_height // 2 - 10),
+                        "(no data)",
+                        fill='gray',
+                        font=value_font
+                    )
+        
+        # Save and display
+        with tempfile.NamedTemporaryFile(suffix='.png', delete=False) as tmp:
+            canvas.save(tmp.name)
+            
+            # Clean up old file
+            if self.temp_file_path and os.path.exists(self.temp_file_path):
                 try:
-                    os.remove(self.temp_preview_path)
+                    os.remove(self.temp_file_path)
                 except:
                     pass
             
-            with tempfile.NamedTemporaryFile(suffix='.png', delete=False) as tmp:
+            self.temp_file_path = tmp.name
-                self.label_image.save(tmp.name)
-                self.temp_preview_path = tmp.name
             
-            # Clear and recreate children
+            # Update display
             self.clear_widgets()
-            
+            img_widget = KivyImage(source=tmp.name, size_hint=(1, 1))
-            # Add image
+            self.add_widget(img_widget)
-            img = KivyImage(source=self.temp_preview_path, size_hint=(1, 1))
-            self.add_widget(img)
 
 
 class LabelPrinterApp(App):
@@ -145,7 +240,6 @@ class LabelPrinterApp(App):
             size_hint_y=None,
             height=50,
             font_size='16sp',
-            input_filter='int',
             background_color=(0.95, 0.95, 0.95, 1)
         )
         self.qty_input.bind(text=self.on_input_change)
@@ -203,7 +297,7 @@ class LabelPrinterApp(App):
         container = BoxLayout(orientation='vertical', size_hint_x=0.6, spacing=10)
         
         # Title
-        title = Label(text='[b]Label Preview (11.5cm x 8cm)[/b]', markup=True, 
+        title = Label(text='[b]Label Preview[/b]', markup=True, 
                      size_hint_y=0.08, font_size='18sp')
         container.add_widget(title)
         
@@ -217,241 +311,11 @@ class LabelPrinterApp(App):
         """Update preview when input changes"""
         # Get all input values
         sap_nr = self.sap_input.text
-        quantity = self.qty_input.text
+        cantitate = self.qty_input.text  # This is actually the barcode/cantitate field
         cable_id = self.cable_id_input.text
         
-        # Create label text combining all fields
+        # Update preview
-        if sap_nr or quantity or cable_id:
+        self.preview_widget.update_preview(sap_nr, cantitate, cable_id)
-            label_text = f"{sap_nr}|{quantity}|{cable_id}"
-            self.preview_widget.update_preview(label_text)
-    
-    def print_label(self, instance):
-        """Handle print button press"""
-        sap_nr = self.sap_input.text.strip()
-        quantity = self.qty_input.text.strip()
-        cable_id = self.cable_id_input.text.strip()
-        printer = self.printer_spinner.text
-        
-        # Validate input
-        if not sap_nr and not quantity and not cable_id:
-            self.show_popup("Error", "Please enter at least one field")
-            return
-        
-        # Create combined label text
-        label_text = f"{sap_nr}|{quantity}|{cable_id}"
-        
-        # Show loading popup
-        popup = Popup(
-            title='Printing',
-            content=BoxLayout(
-                orientation='vertical',
-                padding=10,
-                spacing=10
-            ),
-            size_hint=(0.6, 0.3)
-        )
-        
-        popup.content.add_widget(Label(text='Printing label...\nPlease wait'))
-        popup.open()
-        
-        # Print in background thread
-        def print_thread():
-            try:
-                success = print_label_standalone(label_text, printer, preview=0)
-                if success:
-                    popup.dismiss()
-                    self.show_popup("Success", "Label printed successfully!")
-                else:
-                    popup.dismiss()
-                    self.show_popup("Error", "Failed to print label")
-            except Exception as e:
-                popup.dismiss()
-                self.show_popup("Error", f"Print error: {str(e)}")
-        
-        thread = threading.Thread(target=print_thread)
-        thread.daemon = True
-        thread.start()
-    
-    def show_popup(self, title, message):
-        """Show a popup message"""
-        popup = Popup(
-            title=title,
-            content=BoxLayout(
-                orientation='vertical',
-                padding=10,
-                spacing=10
-            ),
-            size_hint=(0.6, 0.3)
-        )
-        
-        popup.content.add_widget(Label(text=message))
-        
-        close_button = Button(text='OK', size_hint_y=0.3)
-        close_button.bind(on_press=popup.dismiss)
-        popup.content.add_widget(close_button)
-        
-        popup.open()
-
-
-if __name__ == '__main__':
-    app = LabelPrinterApp()
-    app.run()
-
-
-class LabelPrinterApp(App):
-    """Main Kivy application for label printing"""
-    
-    def __init__(self, **kwargs):
-        super().__init__(**kwargs)
-        self.available_printers = self.get_available_printers()
-        self.preview_widget = None
-    
-    def get_available_printers(self):
-        """Get list of available printers from CUPS"""
-        try:
-            conn = cups.Connection()
-            printers = conn.getPrinters()
-            return list(printers.keys()) if printers else ["PDF"]
-        except Exception as e:
-            print(f"Error getting printers: {e}")
-            return ["PDF"]
-    
-    def build(self):
-        """Build the main UI"""
-        self.title = "Label Printer Interface"
-        
-        # Main layout - horizontal split between input and preview
-        main_layout = BoxLayout(orientation='horizontal', spacing=10, padding=10)
-        
-        # Left column - Input form
-        left_column = self.create_input_column()
-        
-        # Right column - Preview
-        right_column = self.create_preview_column()
-        
-        main_layout.add_widget(left_column)
-        main_layout.add_widget(right_column)
-        
-        return main_layout
-    
-    def create_input_column(self):
-        """Create the left column with input fields"""
-        container = BoxLayout(orientation='vertical', size_hint_x=0.4, spacing=10)
-        
-        # Title
-        title = Label(text='[b]Label Information[/b]', markup=True, size_hint_y=0.08, 
-                     font_size='18sp')
-        container.add_widget(title)
-        
-        # Scroll view for form
-        scroll = ScrollView(size_hint_y=0.85)
-        form_layout = GridLayout(cols=1, spacing=10, size_hint_y=None, padding=10)
-        form_layout.bind(minimum_height=form_layout.setter('height'))
-        
-        # SAP-Nr. Articol
-        sap_label = Label(text='SAP-Nr. Articol:', size_hint_y=None, height=40, 
-                         font_size='14sp')
-        form_layout.add_widget(sap_label)
-        
-        self.sap_input = TextInput(
-            multiline=False,
-            size_hint_y=None,
-            height=50,
-            font_size='16sp',
-            background_color=(0.95, 0.95, 0.95, 1)
-        )
-        self.sap_input.bind(text=self.on_input_change)
-        form_layout.add_widget(self.sap_input)
-        
-        # Cantitate
-        qty_label = Label(text='Cantitate:', size_hint_y=None, height=40, 
-                         font_size='14sp')
-        form_layout.add_widget(qty_label)
-        
-        self.qty_input = TextInput(
-            multiline=False,
-            size_hint_y=None,
-            height=50,
-            font_size='16sp',
-            input_filter='int',
-            background_color=(0.95, 0.95, 0.95, 1)
-        )
-        self.qty_input.bind(text=self.on_input_change)
-        form_layout.add_widget(self.qty_input)
-        
-        # ID rola cablu
-        cable_id_label = Label(text='ID rola cablu:', size_hint_y=None, height=40, 
-                              font_size='14sp')
-        form_layout.add_widget(cable_id_label)
-        
-        self.cable_id_input = TextInput(
-            multiline=False,
-            size_hint_y=None,
-            height=50,
-            font_size='16sp',
-            background_color=(0.95, 0.95, 0.95, 1)
-        )
-        self.cable_id_input.bind(text=self.on_input_change)
-        form_layout.add_widget(self.cable_id_input)
-        
-        # Printer selection
-        printer_label = Label(text='Select Printer:', size_hint_y=None, height=40, 
-                             font_size='14sp')
-        form_layout.add_widget(printer_label)
-        
-        printer_spinner = Spinner(
-            text=self.available_printers[0] if self.available_printers else "No Printers",
-            values=self.available_printers,
-            size_hint_y=None,
-            height=50,
-            font_size='14sp'
-        )
-        self.printer_spinner = printer_spinner
-        form_layout.add_widget(printer_spinner)
-        
-        scroll.add_widget(form_layout)
-        container.add_widget(scroll)
-        
-        # Print button
-        print_button = Button(
-            text='PRINT LABEL',
-            size_hint_y=0.15,
-            font_size='16sp',
-            background_color=(0.2, 0.6, 0.2, 1),
-            background_normal='',
-            bold=True
-        )
-        print_button.bind(on_press=self.print_label)
-        container.add_widget(print_button)
-        
-        return container
-    
-    def create_preview_column(self):
-        """Create the right column with preview"""
-        container = BoxLayout(orientation='vertical', size_hint_x=0.6, spacing=10)
-        
-        # Title
-        title = Label(text='[b]Label Preview (11.5cm x 8cm)[/b]', markup=True, 
-                     size_hint_y=0.08, font_size='18sp')
-        container.add_widget(title)
-        
-        # Preview canvas
-        self.preview_widget = LabelPreviewWidget(size_hint_y=0.92)
-        container.add_widget(self.preview_widget)
-        
-        return container
-    
-    def on_input_change(self, instance, value):
-        """Update preview when input changes"""
-        # Get all input values
-        sap_nr = self.sap_input.text
-        quantity = self.qty_input.text
-        cable_id = self.cable_id_input.text
-        
-        # Create label text combining all fields
-        if sap_nr or quantity or cable_id:
-            label_text = f"{sap_nr}|{quantity}|{cable_id}"
-            self.preview_widget.update_preview(label_text)
     
     def print_label(self, instance):
         """Handle print button press"""