Class: Glimmer::SWT::LayoutProxy

Inherits:
Object
  • Object
show all
Defined in:
lib/glimmer/swt/layout_proxy.rb

Overview

Proxy for org.eclipse.swt.widgets.Layout

This is meant to be used with a WidgetProxy where it will set the layout in the SWT widget upon instantiation.

Follows the Proxy Design Pattern

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(underscored_layout_name, widget_proxy, args) ⇒ LayoutProxy

Returns a new instance of LayoutProxy.



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# File 'lib/glimmer/swt/layout_proxy.rb', line 43

def initialize(underscored_layout_name, widget_proxy, args)
  @underscored_layout_name = underscored_layout_name
  @widget_proxy = widget_proxy
  args = SWTProxy.constantify_args(args)
  @swt_layout = self.class.swt_layout_class_for(underscored_layout_name).new(*args)
  @widget_proxy.swt_widget.setLayout(@swt_layout)
end

Instance Attribute Details

#swt_layout ⇒ Object (readonly)

Returns the value of attribute swt_layout.



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# File 'lib/glimmer/swt/layout_proxy.rb', line 13

def swt_layout
  @swt_layout
end

#widget_proxy ⇒ Object (readonly)

Returns the value of attribute widget_proxy.



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# File 'lib/glimmer/swt/layout_proxy.rb', line 13

def widget_proxy
  @widget_proxy
end

Class Method Details

.layout_exists?(underscored_layout_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/glimmer/swt/layout_proxy.rb', line 19

def layout_exists?(underscored_layout_name)
  begin
    swt_layout_class_for(underscored_layout_name)
    true
  rescue NameError => e
    false
  end
end

.swt_layout_class_for(underscored_layout_name) ⇒ Object

This supports layouts in and out of basic SWT library



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# File 'lib/glimmer/swt/layout_proxy.rb', line 29

def swt_layout_class_for(underscored_layout_name)
  swt_layout_name = underscored_layout_name.camelcase(:upper)
  swt_layout_class = eval(swt_layout_name)
  unless swt_layout_class.ancestors.include?(Layout)
    raise NameError, "Class #{swt_layout_class} matching #{underscored_layout_name} is not a subclass of org.eclipse.swt.widgets.Layout"
  end
  swt_layout_class
rescue => e
  Glimmer.logger&.debug e.message
  # Glimmer.logger&.debug "#{e.message}\n#{e.backtrace.join("\n")}"
  raise e
end

Instance Method Details

#apply_property_type_converters(attribute_name, args) ⇒ Object 



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# File 'lib/glimmer/swt/layout_proxy.rb', line 68

def apply_property_type_converters(attribute_name, args)
  if args.count == 1 && SWTProxy.has_constant?(args.first)
    args[0] = SWTProxy.constant(args.first)
  end
end

#attribute_getter(attribute_name) ⇒ Object 



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# File 'lib/glimmer/swt/layout_proxy.rb', line 78

def attribute_getter(attribute_name)
  "#{attribute_name.to_s.camelcase(:lower)}"
end

#attribute_setter(attribute_name) ⇒ Object 



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# File 'lib/glimmer/swt/layout_proxy.rb', line 74

def attribute_setter(attribute_name)
  "#{attribute_name.to_s.camelcase(:lower)}="
end

#get_attribute(attribute_name) ⇒ Object 



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# File 'lib/glimmer/swt/layout_proxy.rb', line 64

def get_attribute(attribute_name)
  @swt_layout.send(attribute_getter(attribute_name))
end

#has_attribute?(attribute_name, *args) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/glimmer/swt/layout_proxy.rb', line 51

def has_attribute?(attribute_name, *args)
  @swt_layout.respond_to?(attribute_setter(attribute_name), args)
end

#set_attribute(attribute_name, *args) ⇒ Object 



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# File 'lib/glimmer/swt/layout_proxy.rb', line 55

def set_attribute(attribute_name, *args)
  apply_property_type_converters(attribute_name, args)
  if args.first != @swt_layout.send(attribute_getter(attribute_name))
    @swt_layout.send(attribute_setter(attribute_name), *args)
    @widget_proxy.swt_widget.getShell.pack
    # TODO see if pack(true) is needed
  end
end