Class: Glimmer::DataBinding::WidgetBinding

Inherits:
Object
  • Object
show all
Includes:
Glimmer, Observable, Observer
Defined in:
lib/glimmer/data_binding/widget_binding.rb

Constant Summary

Constants included from Glimmer

GUI

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Glimmer

included

Constructor Details

#initialize(widget, property, sync_exec: nil, async_exec: nil) ⇒ WidgetBinding

Returns a new instance of WidgetBinding.



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# File 'lib/glimmer/data_binding/widget_binding.rb', line 36

def initialize(widget, property, sync_exec: nil, async_exec: nil)
  @widget = widget
  @property = property
  @sync_exec = sync_exec
  @async_exec = async_exec
  SWT::DisplayProxy.instance.auto_exec(override_sync_exec: @sync_exec, override_async_exec: @async_exec) do
    if @widget.is_a?(Glimmer::SWT::WidgetProxy) && @widget.respond_to?(:on_widget_disposed)
      @widget.on_widget_disposed do |dispose_event|
        unless @widget.shell_proxy.last_shell_closing?
          @widget_proxy.widget_bindings.delete(self)
          deregister_all_observables
        end
      end
    end
    # TODO look into hooking on_shape_disposed without slowing down shapes in samples like Tetris
  end
  # TODO try to come up with a more comprehensive and cleaner solution to miscallenous objects like MessageBoxProxy with regards to @widget_proxy
  @widget_proxy = widget.is_a?(Glimmer::SWT::WidgetProxy) ? widget : (widget.respond_to?(:body_root) ? widget.body_root : widget)
end

Instance Attribute Details

#model_binding ⇒ Object (readonly)

Returns the value of attribute model_binding.



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# File 'lib/glimmer/data_binding/widget_binding.rb', line 34

def model_binding
  @model_binding
end

#property ⇒ Object (readonly)

Returns the value of attribute property.



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# File 'lib/glimmer/data_binding/widget_binding.rb', line 34

def property
  @property
end

#widget ⇒ Object (readonly)

Returns the value of attribute widget.



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# File 'lib/glimmer/data_binding/widget_binding.rb', line 34

def widget
  @widget
end

Instance Method Details

#call(value) ⇒ Object 



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# File 'lib/glimmer/data_binding/widget_binding.rb', line 66

def call(value)
  SWT::DisplayProxy.instance.auto_exec(override_sync_exec: @sync_exec, override_async_exec: @async_exec) do
    if @widget.respond_to?(:disposed?) && @widget.disposed?
      unless @widget.shell_proxy.last_shell_closing?
        @widget_proxy.widget_bindings.delete(self)
        deregister_all_observables
      end
      return
    end
    # need the rescue false for a scenario with tree items not being equal to model objects raising an exception
    if @async_exec || !((value == evaluate_property) rescue false) # need the rescue false for a scenario with tree items not being equal to model objects raising an exception
      @widget.set_attribute(@property, value)
    end
  end
end

#evaluate_property ⇒ Object 



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# File 'lib/glimmer/data_binding/widget_binding.rb', line 82

def evaluate_property
  if @widget.respond_to?(:disposed?) && @widget.disposed?
    unless @widget.shell_proxy.last_shell_closing?
      @widget_proxy.widget_bindings.delete(self)
      deregister_all_observables
    end
    return
  end
  @widget.get_attribute(@property)
end

#observe(*args) ⇒ Object 



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# File 'lib/glimmer/data_binding/widget_binding.rb', line 56

def observe(*args)
  if @widget_proxy.respond_to?(:widget_bindings)
    # TODO try to come up with a more comprehensive and cleaner solution to miscallenous objects like MessageBoxProxy with regards to the following code
    # assumes only one observation
    @model_binding = args.first if args.size == 1
    @widget_proxy.widget_bindings << self
  end
  super
end