Refactor & Add Scan Screen

src/bitmessagekivy/baseclass/scan_screen.py

@@ -0,0 +1,104 @@
+# pylint: disable=no-member, too-many-arguments, too-few-public-methods
+# pylint: disable=no-name-in-module, unused-argument, arguments-differ
+
+"""
+QR code Scan Screen used in message composer to get recipient address
+
+"""
+
+import os
+import cv2
+
+from kivy.clock import Clock
+from kivy.lang import Builder
+from kivy.properties import (
+    BooleanProperty,
+    ObjectProperty,
+    StringProperty
+)
+from kivy.uix.screenmanager import Screen
+
+from bitmessagekivy.get_platform import platform
+
+from debug import logger
+
+
+class ScanScreen(Screen):
+    """ScanScreen is for scaning Qr code"""
+    # pylint: disable=W0212
+    camera_avaialbe = BooleanProperty(False)
+    previous_open_screen = StringProperty()
+    pop_up_instance = ObjectProperty()
+
+    def __init__(self, *args, **kwargs):
+        """Getting AddressBook Details"""
+        super(ScanScreen, self).__init__(*args, **kwargs)
+        self.check_camera()
+
+    def check_camera(self):
+        """This method is used for checking camera avaibility"""
+        if platform != "android":
+            cap = cv2.VideoCapture(0)
+            is_cam_open = cap.isOpened()
+            while is_cam_open:
+                logger.debug('Camera is available!')
+                self.camera_avaialbe = True
+                break
+            else:
+                logger.debug("Camera is not available!")
+                self.camera_avaialbe = False
+        else:
+            self.camera_avaialbe = True
+
+    def get_screen(self, screen_name, instance=None):
+        """This method is used for getting previous screen name"""
+        self.previous_open_screen = screen_name
+        if screen_name != 'composer':
+            self.pop_up_instance = instance
+
+    def on_pre_enter(self):
+        """
+       on_pre_enter works little better on android
+       It affects screen transition on linux
+       """
+        if not self.children:
+            tmp = Builder.load_file(
+                os.path.join(
+                    os.path.dirname(os.path.dirname(__file__)), "kv", "{}.kv").format("scanner")
+            )
+            self.add_widget(tmp)
+        if platform == "android":
+            Clock.schedule_once(self.start_camera, 0)
+
+    def on_enter(self):
+        """
+       on_enter works better on linux
+       It creates a black screen on android until camera gets loaded
+       """
+        if platform != "android":
+            Clock.schedule_once(self.start_camera, 0)
+
+    def on_leave(self):
+        """This method will call on leave"""
+        Clock.schedule_once(self.stop_camera, 0)
+
+    def start_camera(self, *args):
+        """Its used for starting camera for scanning qrcode"""
+        # pylint: disable=attribute-defined-outside-init
+        self.xcam = self.children[0].ids.zbarcam.ids.xcamera
+        if platform == "android":
+            self.xcam.play = True
+        else:
+            Clock.schedule_once(self.open_cam, 0)
+
+    def stop_camera(self, *args):
+        """Its used for stop the camera"""
+        self.xcam.play = False
+        if platform != "android":
+            self.xcam._camera._device.release()
+
+    def open_cam(self, *args):
+        """It will open up the camera"""
+        if not self.xcam._camera._device.isOpened():
+            self.xcam._camera._device.open(self.xcam._camera._index)
+        self.xcam.play = True