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