I04_1:399 add scan countdown to the gui

A new countdown box added to the gui next to the information box.
It shows the time left to the timeout in seconds. It updates every second.
It is cleared as soon as the scan is stopped.
It starts with top camera scanner.

Author: UrszulaNeuman

dls_barcode/gui/countdown_box.py

@@ -0,0 +1,43 @@
+from PyQt5 import QtCore
+from PyQt5.QtWidgets import QLabel, QGroupBox, QVBoxLayout
+
+BLACK = "; color: black"
+BASIC_STYLE_SHEET = "font-size: 25pt"
+
+
+class CountdownBox(QGroupBox):
+    """GUI component. Displays countdown for the user."""
+
+    def __init__(self):
+        super(CountdownBox, self).__init__()
+
+        self.setTitle("Countdown")
+        self.setMaximumHeight(100)
+        self.setMaximumWidth(100)
+        self._init_ui()
+        self.count = None
+
+    def _init_ui(self):
+        self._message_lbl = QLabel()
+        self._message_lbl.setStyleSheet(BASIC_STYLE_SHEET + BLACK)
+        self._message_lbl.setAlignment(QtCore.Qt.AlignCenter)
+        vbox = QVBoxLayout()
+        vbox.addWidget(self._message_lbl)
+        vbox.addStretch()
+        self.setLayout(vbox)
+
+    def start_countdown(self, count):
+        self.count = count
+        self._timer = QtCore.QTimer()
+        self._timer.timeout.connect(self.display)
+        self._timer.start(1000)
+
+    def reset_countdown(self):
+        self._message_lbl.clear()
+        self.count = None
+
+    def display(self):
+        self._message_lbl.clear()
+        if self.count is not None and self.count >= 0:
+            self._message_lbl.setText(str(self.count))
+            self.count = self.count - 1

dls_barcode/gui/main_window.py

@@ -1,24 +1,21 @@
-import sys
 from PyQt5 import QtWidgets, QtGui
 
 from dls_barcode.config import BarcodeConfigDialog
-
 from dls_barcode.gui.scan_button import ScanButton
-
 from .barcode_table import BarcodeTable
+from .countdown_box import CountdownBox
 from .image_frame import ImageFrame
-from .record_table import ScanRecordTable
+from .menu_bar import MenuBar
 from .message_box import MessageBox
 from .message_factory import MessageFactory
-from .menu_bar import MenuBar
+from .record_table import ScanRecordTable
 
 
 class DiamondBarcodeMainWindow(QtWidgets.QMainWindow):
     """ Main GUI window for the Barcode Scanner App.
     """
 
     def __init__(self, config, version, flags, *args, **kwargs):
-        #super(DiamondBarcodeMainWindow, self).__init__(None, None)
 
         super().__init__(flags, *args, **kwargs)
         self._config = config
@@ -32,6 +29,7 @@ def __init__(self, config, version, flags, *args, **kwargs):
         self._barcode_table = None
         self._image_frame = None
         self._scan_button = None
+        self._countdown_box = None
 
         self._init_ui()
 
@@ -61,6 +59,9 @@ def _init_ui(self):
         # Message display
         self._message_box = MessageBox()
 
+        # Count down display
+        self._countdown_box = CountdownBox()
+
         # Create layout
 
         hbox = QtWidgets.QHBoxLayout()
@@ -75,7 +76,14 @@ def _init_ui(self):
 
         img_vbox = QtWidgets.QVBoxLayout()
         img_vbox.addWidget(self._image_frame)
-        img_vbox.addWidget(self._message_box)
+
+        msg_hbox = QtWidgets.QHBoxLayout()
+        msg_hbox.setSpacing(10)
+        msg_hbox.addWidget(self._message_box)
+        msg_hbox.addWidget(self._countdown_box)
+
+        img_vbox.addLayout(msg_hbox)
+
         hbox.addLayout(img_vbox)
 
         vbox = QtWidgets.QVBoxLayout()
@@ -104,7 +112,6 @@ def _to_run_on_table_clicked(self):
     def _on_about_action_clicked(self):
         QtWidgets.QMessageBox.about(self, 'About', "Version: " + self._version)
 
-
     def _on_scan_action_clicked(self):
         print("MAIN: Scan menu clicked")
         if not self._camera_capture_alive():
@@ -142,3 +149,9 @@ def addRecordFrame(self, latest_holder_barcode, plate, latest_holder_image, pins
 
     def isLatestHolderBarcode(self, holder_barcode):
         return self._record_table.is_latest_holder_barcode(holder_barcode)
+
+    def startCountdown(self, count):
+        self._countdown_box.start_countdown(count)
+
+    def resetCountdown(self):
+        self._countdown_box.reset_countdown()

dls_barcode/main_manager.py

@@ -1,10 +1,10 @@
-
 import multiprocessing
 import queue
 import time
+
 from PyQt5 import QtCore
-from dls_barcode.camera import CameraScanner, CameraSwitch, NoNewBarcodeMessage, ScanErrorMessage
 
+from dls_barcode.camera import CameraScanner, CameraSwitch, NoNewBarcodeMessage, ScanErrorMessage
 from dls_util import Beeper
 
 RESULT_TIMER_PERIOD = 1000  # ms
@@ -27,7 +27,6 @@ def __init__(self, ui, config):
         self._result_queue = multiprocessing.Queue()
         self._view_queue = multiprocessing.Queue()
         self._message_queue = multiprocessing.Queue()
-        #self._reset_msg_timer()
         # initialise all actions
         self._ui.set_actions_triger(self._cleanup, self.initialise_scanner, self._camera_capture_alive)
 
@@ -52,6 +51,7 @@ def _cleanup(self):
         self._camera_scanner.kill()
         self._camera_scanner = None
         self._camera_switch = None
+        self._ui.resetCountdown()
 
     def initialise_scanner(self):
         self._camera_scanner = CameraScanner(self._result_queue, self._view_queue, self._message_queue, self._config)
@@ -63,9 +63,11 @@ def _camera_capture_alive(self):
 
     def _restart_live_capture_from_top(self):
         self._camera_switch.restart_live_capture_from_top()
+        self._ui.startCountdown(self._config.top_camera_timeout.value())
 
     def _restart_live_capture_from_side(self):
         self._reset_msg_timer()
+        self._ui.resetCountdown()
         self._camera_switch.restart_live_capture_from_side()
 
     def _read_message_queue(self):