# Copyright (c) 2007-2021 Andy Maleh # # Permission is hereby granted, free of charge, to any person obtaining # a copy of this software and associated documentation files (the # "Software"), to deal in the Software without restriction, including # without limitation the rights to use, copy, modify, merge, publish, # distribute, sublicense, and/or sell copies of the Software, and to # permit persons to whom the Software is furnished to do so, subject to # the following conditions: # # The above copyright notice and this permission notice shall be # included in all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. module Glimmer module SWT # Proxy for widget listeners # # Follows the Proxy Design Pattern class WidgetListenerProxy attr_reader :swt_widget, :swt_display, :swt_listener, :widget_add_listener_method, :swt_listener_class, :swt_listener_method, :event_type, :swt_constant def initialize(swt_widget:nil, swt_display:nil, swt_listener:, widget_add_listener_method: nil, swt_listener_class: nil, swt_listener_method: nil, event_type: nil, swt_constant: nil, filter: false) @swt_widget = swt_widget @swt_display = swt_display @filter = filter @swt_listener = swt_listener @widget_add_listener_method = widget_add_listener_method @swt_listener_class = swt_listener_class @swt_listener_method = swt_listener_method @event_type = event_type @swt_constant = swt_constant end def widget_remove_listener_method @widget_add_listener_method.sub('add', 'remove') end def deregister return if @swt_widget&.is_disposed || @swt_display&.is_disposed if @swt_display if @filter @swt_display.removeFilter(@event_type, @swt_listener) else @swt_display.removeListener(@event_type, @swt_listener) end elsif @event_type @swt_widget.removeListener(@event_type, @swt_listener) else @swt_widget.send(widget_remove_listener_method, @swt_listener) end end alias unregister deregister # TODO consider dropping unregister (and in Observer too) end end end