Class: Xlib::XI::EventMask

Inherits:
Object
  • Object
show all
Defined in:
lib/xlib/xi/event_mask.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(devices, mask) ⇒ EventMask

Returns a new instance of EventMask.



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# File 'lib/xlib/xi/event_mask.rb', line 4

def initialize(devices, mask)
  @devices = [*devices]
  @mask = mask
end

Instance Attribute Details

#devices ⇒ Object (readonly)

Returns the value of attribute devices.



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# File 'lib/xlib/xi/event_mask.rb', line 9

def devices
  @devices
end

#mask ⇒ Object (readonly)

Returns the value of attribute mask.



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# File 'lib/xlib/xi/event_mask.rb', line 9

def mask
  @mask
end

Instance Method Details

#to_native ⇒ Object 



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# File 'lib/xlib/xi/event_mask.rb', line 11

def to_native
  @structs ||= begin
    masks_ptr = FFI::MemoryPointer.new(Xlib::XIEventMask.size, @devices.count)

    @devices.each.with_index do |device, idx|
      byte_length = (@mask.bit_length/8.0).ceil
      mask_ptr = FFI::MemoryPointer.new :int
      mask_ptr.write_int @mask

      Xlib::XIEventMask.new(masks_ptr[idx]).tap do |event_mask|
        event_mask[:deviceid] = device.is_a?(XlibObj::InputDevice) ? device.id : device
        event_mask[:mask_len] = FFI.type_size(:int)
        event_mask[:mask] = mask_ptr
      end
    end

    Xlib::XIEventMask.new(masks_ptr[0]).pointer
  end
end