Class: PPCurses::ResponderManager

Inherits:
Responder
  • Object
show all
Defined in:
lib/ppcurses/application.rb

Overview

Derived from methods defined in Cocoa NSWindow

Current link, which probably won’t be valid in the future …

developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSWindow_Class/index.html#//apple_ref/occ/instm/NSWindow

Direct Known Subclasses

Application, View

Instance Attribute Summary collapse

Attributes inherited from Responder

#next_responder

Instance Method Summary collapse

Methods inherited from Responder

#become_first_responder, isa, #key_down, #resign_first_responder

Instance Attribute Details

#first_responder ⇒ Object

The first responder is the first object in a responder chain to receive an event or action message.



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# File 'lib/ppcurses/application.rb', line 72

def first_responder
  @first_responder
end

Instance Method Details

#accepts_first_responder ⇒ Object 



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# File 'lib/ppcurses/application.rb', line 74

def accepts_first_responder
  YES
end

#make_first_responder(responder) ⇒ Object

Attempts to make a given responder the first responder

If responder isn’t already the first responder, this method first sends a resign_first_responder message to the object that is the first responder. If that object refuses to resign, it remains the first responder, and this method immediately returns NO. If the current first responder resigns, this method sends a become_first_responder message to responder.

If responder does not accept first responder status, the ResponderManager becomes first responder; in this case, the method returns YES even if the responder refused first responder status.

If responder is nil, this method still sends resign_first_responder to the current first responder.



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# File 'lib/ppcurses/application.rb', line 92

def make_first_responder( responder )

  Responder.isa(responder) unless responder.nil?

  if responder != @first_responder
    will_resign = responder.resign_first_responder
    unless will_resign
      return NO
    end
  end

  @first_responder = nil

  accepted = NO
  will_accept = responder.accepts_first_responder

  if will_accept
    accepted = responder.become_first_responder
  end

  unless accepted
    @first_responder = self
    return YES
  end

  @first_responder = responder

  YES
end