Class: XlibObj::Display

Inherits:
Object
  • Object
show all
Defined in:
lib/display.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name) ⇒ Display

Returns a new instance of Display.

Raises:

  • (ArgumentError) 


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# File 'lib/display.rb', line 22

def initialize(name)
  display_pointer = Xlib.XOpenDisplay(name)
  raise ArgumentError, "Unknown display #{name}" if display_pointer.null?
  @struct = Xlib::Display.new(display_pointer)
end

Class Method Details

.names ⇒ Object 



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# File 'lib/display.rb', line 14

def names
  Dir['/tmp/.X11-unix/*'].map do |file_name|
    match = file_name.match(/X(\d+)$/)
    ":#{match[1]}" if match
  end.compact
end

Instance Method Details

#flush ⇒ Object 



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# File 'lib/display.rb', line 89

def flush
  Xlib.XFlush(to_native)
  handle_events
end

#focused_window ⇒ Object 



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# File 'lib/display.rb', line 44

def focused_window
  screens.reduce(nil){ |focused_window, s| focused_window or s.focused_window }
end

#handle_events ⇒ Object 



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# File 'lib/display.rb', line 48

def handle_events
  handle_event(next_event) while pending_events > 0
end

#name ⇒ Object 



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# File 'lib/display.rb', line 32

def name
  @struct[:display_name]
end

#on_error(&callback) ⇒ Object 



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# File 'lib/display.rb', line 62

def on_error(&callback)
  @error_handler = if callback
    FFI::Function.new(:pointer, [:pointer, :pointer]) do |display_ptr, error_ptr|
      next if display_ptr != to_native
      x_error = Xlib::XErrorEvent.new(error_ptr)
      callback.call Error.new(self, x_error)
    end
  else
    nil
  end

  Xlib.XSetErrorHandler(@error_handler)
end

#on_io_error(&callback) ⇒ Object 



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# File 'lib/display.rb', line 76

def on_io_error(&callback)
  @io_error_handler = if callback
    FFI::Function.new(:pointer, [:pointer]) do |display_ptr|
      next if display_ptr != to_native
      callback.call
    end
  else
    nil
  end

  Xlib.XSetIOErrorHandler(@io_error_handler)
end

#screens ⇒ Object 



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# File 'lib/display.rb', line 40

def screens
  (0..@struct[:nscreens]-1).map{ |number| screen(number) }
end

#selection(*args, &on_receive) ⇒ Object 



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# File 'lib/display.rb', line 52

def selection(*args, &on_receive)
  internal_window.request_selection(*args, &on_receive)
  self
end

#set_selection(*args, &on_request) ⇒ Object 



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# File 'lib/display.rb', line 57

def set_selection(*args, &on_request)
  internal_window.set_selection(*args, &on_request)
  self
end

#socket ⇒ Object 



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# File 'lib/display.rb', line 36

def socket
  @socket ||= UNIXSocket.for_fd(Xlib.XConnectionNumber(to_native))
end

#to_native ⇒ Object 



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# File 'lib/display.rb', line 28

def to_native
  @struct.pointer
end