Class: Glimmer::SWT::ColorProxy

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

Overview

Proxy for org.eclipse.swt.graphics.Color

Invoking #swt_color returns the SWT Color object wrapped by this proxy

Follows the Proxy Design Pattern and Flyweight Design Pattern (caching memoization)

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ ColorProxy

Initializes a proxy for an SWT Color object

Takes a standard color single argument, rgba 3 args, or rgba 4 args

A standard color is a string/symbol representing one of the SWT.COLOR_*** constants like SWT.COLOR_RED, but in underscored string format (e.g :color_red). Glimmer can also accept standard color names without the color_ prefix, and it will automatically figure out the SWT.COLOR_*** constant (e.g. :red)

rgb is 3 arguments representing Red, Green, Blue numeric values

rgba is 4 arguments representing Red, Green, Blue, and Alpha numeric values



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# File 'lib/glimmer/swt/color_proxy.rb', line 61

def initialize(*args)
  @options = args.last.is_a?(Hash) ? args.pop : {}
  @args = args
  @args = @args.first if @args.first.is_a?(Array)
  ensure_arg_values_within_valid_bounds unless @options[:ensure_bounds] == false
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *args, &block) ⇒ Object 



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# File 'lib/glimmer/swt/color_proxy.rb', line 86

def method_missing(method_name, *args, &block)
  swt_color.send(method_name, *args, &block)
rescue => e
  Glimmer::Config.logger.debug {"Neither ColorProxy nor #{swt_color.class.name} can handle the method ##{method_name}"}
  super
end

Class Method Details

.create(*args) ⇒ Object 



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# File 'lib/glimmer/swt/color_proxy.rb', line 36

def create(*args)
  flyweight_color_proxies[args] ||= new(*args)
end

.flyweight_color_proxies ⇒ Object

Flyweight Design Pattern memoization cache. Can be cleared if memory is needed.



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# File 'lib/glimmer/swt/color_proxy.rb', line 41

def flyweight_color_proxies
  @flyweight_color_proxies ||= {}
end

Instance Method Details

#respond_to?(method_name, *args, &block) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/glimmer/swt/color_proxy.rb', line 93

def respond_to?(method_name, *args, &block)
  super || swt_color.respond_to?(method_name, *args, &block)
end

#swt_color ⇒ Object 



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

def swt_color
  unless @swt_color
    case @args.size
    when 1
      if @args.first.is_a?(String) || @args.first.is_a?(Symbol)
        standard_color = @args.first
        standard_color = "color_#{standard_color}".to_sym unless standard_color.to_s.downcase.include?('color_')
        @swt_color = DisplayProxy.instance.swt_display.getSystemColor(SWTProxy[standard_color])
      else
        @swt_color = @args.first
      end
    when 3..4
      @swt_color = Color.new(*@args)
    end
  end
  @swt_color
end