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# Additions to UIControl to support jQuery-style `on` and `off` methods.
class UIControl
# Add event handlers to UIControls. See symbol.rb for the uicontrolevent
# constant aliases.
#
# @example
# button = UIButton.alloc.initWithFrame([0, 0, 10, 10])
# button.on(:touch) { my_code }
# button.on(:touchupoutside, :touchcancel) { my_code }
# # up to two arguments can be passed in
# button.on(:touch) { |sender,touch_event| my_code }
def on(*events, &block)
handler = SugarCube::UIControlCallbackHelper.new
handler.callback = block
events.each do |event|
event = event.uicontrolevent unless event.is_a? Fixnum
sugarcube_callbacks[event].push(handler)
addTarget(handler, action:'call:event:', forControlEvents:event)
end
self
end
# Removes all events that were bound with `on`. See symbol.rb for the
# uicontrolevent constant aliases.
#
# @example
# button.off(:touch)
# button.off(:touchupoutside, :touchcancel)
# button.off # all events
def off(*events)
if events.length == 0
events = sugarcube_callbacks.keys
end
events.each do |event|
event = event.uicontrolevent unless event.is_a? Fixnum
sugarcube_callbacks[event].each do |handler|
self.removeTarget(handler, action:'call:event:', forControlEvents:event)
end
sugarcube_callbacks.delete(event)
end
self
end
# private
# event blocks need to be retained, and the addTarget method explicitly does
# *not* retain `target`. This makes sure that callbacks are retained by
# pushing the block onto a stack.
def sugarcube_callbacks
@sugarcube_callbacks ||= Hash.new { |hash, key| hash[key] = [] }
end
end
module SugarCube
class UIControlCallbackHelper
attr_accessor :callback
def call(sender, event:event)
case callback.arity
when 0
callback.call
when 1
callback.call(sender)
else
callback.call(sender, event)
end
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems