Class: Tgios::ScanQrController

Inherits:
UIViewController
  • Object
show all
Defined in:
lib/tgios/scan_qr_controller.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#bottom_text ⇒ Object

Returns the value of attribute bottom_text.



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# File 'lib/tgios/scan_qr_controller.rb', line 3

def bottom_text
  @bottom_text
end

#types ⇒ Object

Returns the value of attribute types.



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# File 'lib/tgios/scan_qr_controller.rb', line 3

def types
  @types
end

Instance Method Details

#captureOutput(captureOutput, didOutputMetadataObjects: metadataObjects, fromConnection: connection) ⇒ Object 



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# File 'lib/tgios/scan_qr_controller.rb', line 147

def captureOutput(captureOutput, didOutputMetadataObjects: metadataObjects, fromConnection: connection)
  metadataObject = metadataObjects[0]

  if !@scanned && metadataObject.present?
    @scanned = true

    self.performSelectorOnMainThread('openQRCode:', withObject: metadataObject.stringValue, waitUntilDone: false)
  end
end

#check_permission ⇒ Object 



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# File 'lib/tgios/scan_qr_controller.rb', line 19

def check_permission
  status = AVCaptureDevice.authorizationStatusForMediaType(AVMediaTypeVideo)
  if status == AVAuthorizationStatusAuthorized
    self.performSelector('startScanning', withObject: nil, afterDelay: 0.5)
  elsif status == AVAuthorizationStatusNotDetermined
    Dispatch::Queue.new('ScanQrController').async do
      AVCaptureDevice.requestAccessForMediaType(AVMediaTypeVideo, completionHandler: ->(granted) {
            if granted
              Dispatch::Queue.main.async do
                startScanning
              end
            else
              Dispatch::Queue.main.async do
                @events[:permission_denied].call if @events[:permission_denied]
              end
            end
          })
    end
  else
    @events[:permission_denied].call if @events[:permission_denied]
  end
end

#dealloc ⇒ Object 



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# File 'lib/tgios/scan_qr_controller.rb', line 203

def dealloc
  ap "#{self.class.name} dealloc"
  super
end

#fake_scan ⇒ Object 



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# File 'lib/tgios/scan_qr_controller.rb', line 182

def fake_scan
  @load_view.stop_loading
  @isScanning = false
  @events[:fake_result].call do |result|
    fake_result = result
  end unless @events[:fake_result].nil?
  fake_result ||= "#{rand(100)+1}"
  openQRCode(fake_result)
end

#init ⇒ Object 



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# File 'lib/tgios/scan_qr_controller.rb', line 197

def init
  super
  @events={}
  self
end

#on(event, &block) ⇒ Object 



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# File 'lib/tgios/scan_qr_controller.rb', line 192

def on(event, &block)
  @events[event] = block.weak!
  self
end

#openQRCode(result) ⇒ Object 



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# File 'lib/tgios/scan_qr_controller.rb', line 157

def openQRCode(result)
  stop_scanning

  self.dismissViewControllerAnimated(true, completion: -> {
        @events[:result_scanned].call(result)
      })
end

#setupCapture ⇒ Object 



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# File 'lib/tgios/scan_qr_controller.rb', line 47

def setupCapture
  #NSLog "setCapture()"

  @session = AVCaptureSession.alloc.init
  @session.sessionPreset = AVCaptureSessionPresetHigh

  @device = AVCaptureDevice.defaultDeviceWithMediaType AVMediaTypeVideo
  if @device.lockForConfiguration(nil)
    if @device.isFocusModeSupported(AVCaptureFocusModeContinuousAutoFocus)
      @device.focusMode = AVCaptureFocusModeContinuousAutoFocus
    end
    if @device.isAutoFocusRangeRestrictionSupported
      @device.autoFocusRangeRestriction = AVCaptureAutoFocusRangeRestrictionNear
    end
    @device.unlockForConfiguration
  end

  @error = Pointer.new('@')
  @input = AVCaptureDeviceInput.deviceInputWithDevice @device, error: @error

  @previewLayer = AVCaptureVideoPreviewLayer.alloc.initWithSession(@session)
  @previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
  layerRect = self.view.layer.bounds
  @previewLayer.bounds = layerRect
  @previewLayer.setPosition(CGPointMake(CGRectGetMidX(layerRect), CGRectGetMidY(layerRect)))
  self.view.layer.addSublayer(@previewLayer)

  @queue = Dispatch::Queue.new('camQueue')
  @output = AVCaptureMetadataOutput.alloc.init
  @output.setMetadataObjectsDelegate self, queue: @queue.dispatch_object

  if @bottom_text
    whole_lbl_h = 36
    lbl_h = 18
    t_frame = layerRect.dup
    t_frame.origin.y = t_frame.size.height - whole_lbl_h
    t_frame.size.height = whole_lbl_h
    bg_layer = Base.style(CALayer.layer,
        frame: t_frame,
        backgroundColor: :black.cgcolor(0.3),
    )
    self.view.layer.addSublayer(bg_layer)

    t_frame.origin.y = (whole_lbl_h - lbl_h)/ 2.0
    t_frame.size.height = lbl_h
    text_layer = Base.style(CATextLayer.layer,
        contentsScale: UIScreen.mainScreen.scale,
        frame: t_frame,
        foregroundColor: :white.cgcolor,
        alignmentMode: KCAAlignmentCenter,
        truncationMode: KCATruncationEnd,
        fontSize: 14,
    )
    bg_layer.addSublayer(text_layer)
    text_layer.string = @bottom_text
  end

  camera_size = layerRect.size
  sq_size = 240
  sq_border = 20
  line_length = 60
  border_color = :white.cgcolor(0.8)
  sq_x = (camera_size.width - sq_size) / 2
  sq_y = (camera_size.height - sq_size) / 2

  square = Base.style(CALayer.layer, {frame: [[sq_x, sq_y],[sq_size, sq_size]]})

  top_left = Base.style(CALayer.layer, frame: [[0, 0], [line_length, sq_border]], backgroundColor: border_color)
  top_right = Base.style(CALayer.layer, frame: [[sq_size-line_length, 0], [line_length, sq_border]], backgroundColor: border_color)
  left_top = Base.style(CALayer.layer, frame: [[0, sq_border], [sq_border, line_length - sq_border]], backgroundColor: border_color)
  right_top = Base.style(CALayer.layer, frame: [[sq_size - sq_border, sq_border], [sq_border, line_length - sq_border]], backgroundColor: border_color)
  left_bottom = Base.style(CALayer.layer, frame: [[0, sq_size - line_length], [sq_border, line_length - sq_border]], backgroundColor: border_color)
  right_bottom = Base.style(CALayer.layer, frame: [[sq_size - sq_border, sq_size - line_length], [sq_border, line_length - sq_border]], backgroundColor: border_color)
  bottom_left = Base.style(CALayer.layer, frame: [[0, sq_size - sq_border], [line_length, sq_border]], backgroundColor: border_color)
  bottom_right = Base.style(CALayer.layer, frame: [[sq_size-line_length, sq_size - sq_border], [line_length, sq_border]], backgroundColor: border_color)

  square.addSublayer top_left
  square.addSublayer top_right
  square.addSublayer left_top
  square.addSublayer right_top
  square.addSublayer left_bottom
  square.addSublayer right_bottom
  square.addSublayer bottom_left
  square.addSublayer bottom_right

  self.view.layer.addSublayer square

  @output.rectOfInterest = [[sq_y / camera_size.height, sq_x / camera_size.width], [sq_size / camera_size.height, sq_size / camera_size.width]]

  @session.addInput @input
  @session.addOutput @output
  @output.metadataObjectTypes = ( @types || [AVMetadataObjectTypeQRCode] )

  @isScanning = true

  @session.startRunning

  true
end

#startScanning ⇒ Object 



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# File 'lib/tgios/scan_qr_controller.rb', line 42

def startScanning
  @load_view.stop_loading
  setupCapture
end

#stop_scanning ⇒ Object 



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# File 'lib/tgios/scan_qr_controller.rb', line 165

def stop_scanning

  NSObject.cancelPreviousPerformRequestsWithTarget(self)

  if @isScanning
    @isScanning = false

    @session.stopRunning

    @previewLayer.removeFromSuperlayer
    @previewLayer = nil

    @session = nil
  end
  self.navigationItem.leftBarButtonItem = nil
end

#viewDidLoad ⇒ Object 



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# File 'lib/tgios/scan_qr_controller.rb', line 5

def viewDidLoad
  super
  self.view.backgroundColor = :dark_gray.uicolor
  @load_view = Tgios::LoadingView.add_loading_view_to(self.view)
  @load_view.start_loading
  if NSProcessInfo.processInfo.environment[:IPHONE_SIMULATOR_DEVICE].present?
    self.performSelector('fake_scan', withObject: nil, afterDelay: 3)
  else
    check_permission
    # self.performSelector('startScanning', withObject: nil, afterDelay: 0.5)
  end

end