Class: Glimmer::SWT::ImageProxy

Inherits:
Object
  • Object
show all
Includes:
Custom::Drawable, Properties
Defined in:
lib/glimmer/swt/image_proxy.rb

Overview

Proxy for org.eclipse.swt.graphics.Image

Invoking ‘#swt_image` returns the SWT Image object wrapped by this proxy

Follows the Proxy Design Pattern

Instance Attribute Summary collapse

Attributes included from Custom::Drawable

#image_double_buffered, #requires_shape_disposal

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Properties

attribute_getter, #attribute_getter, attribute_setter, #attribute_setter, normalized_attribute, #normalized_attribute, ruby_attribute_getter, #ruby_attribute_setter, ruby_attribute_setter

Methods included from Custom::Drawable

#add_shape, #clear_shapes, #deregister_shape_painting, #image_buffered_shapes, #setup_shape_painting, #shapes

Constructor Details

#initialize(*args, &content) ⇒ ImageProxy

Initializes a proxy for an SWT Image object

Takes the same args as the SWT Image class Alternatively, takes a file path string or a uri:classloader file path string (generated by JRuby when invoking ‘File.expand_path` inside a JAR file) and returns an image object. Last but not least, it could serve as a parent for nesting shapes underneath to build an image with the Canvas Shape DSL



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# File 'lib/glimmer/swt/image_proxy.rb', line 57

def initialize(*args, &content)
  @args = args
  @parent_proxy = nil
  if @args.first.is_a?(WidgetProxy)
    @parent_proxy = @args.shift
    @parent = @parent_proxy.swt_widget
  end
  options = @args.last.is_a?(Hash) ? @args.delete_at(-1) : {}
  options[:swt_image] = @args.first if @args.size == 1 && @args.first.is_a?(Image)
  @file_path = @args.first if @args.first.is_a?(String)
  @args = @args.first if @args.size == 1 && @args.first.is_a?(Array)
  if options&.keys&.include?(:swt_image)
    @swt_image = options[:swt_image]
    @original_image_data = @image_data = @swt_image.image_data
  elsif args.size == 1 && args.first.is_a?(ImageProxy)
    @swt_image = @args.first.swt_image
    @original_image_data = @image_data = @swt_image.image_data
  elsif @file_path
    @original_image_data = @image_data = ImageData.new(input_stream || @file_path)
    @swt_image = Image.new(DisplayProxy.instance.swt_display, @image_data)
    width = options[:width]
    height = options[:height]
    height = (@image_data.height.to_f / @image_data.width.to_f)*width.to_f if !width.nil? && height.nil?
    width = (@image_data.width.to_f / @image_data.height.to_f)*height.to_f if !height.nil? && width.nil?
    scale_to(width, height) unless width.nil? || height.nil?
  elsif !@args.first.is_a?(ImageProxy) && !@args.first.is_a?(Image)
    @args.prepend(DisplayProxy.instance.swt_display) unless @args.first.is_a?(Display)
    @swt_image = Image.new(*@args)
    @original_image_data = @image_data = @swt_image.image_data
  end
  proxy = self
  # TODO consider adding a get_data/set_data method to conform with other SWT widgets
  @swt_image.singleton_class.define_method(:dispose) do
    proxy.clear_shapes
    super
  end
  post_add_content if content.nil?
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

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



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# File 'lib/glimmer/swt/image_proxy.rb', line 183

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

Instance Attribute Details

#file_path ⇒ Object (readonly)

Returns the value of attribute file_path.



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# File 'lib/glimmer/swt/image_proxy.rb', line 49

def file_path
  @file_path
end

#image_data ⇒ Object (readonly)

Returns the value of attribute image_data.



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# File 'lib/glimmer/swt/image_proxy.rb', line 49

def image_data
  @image_data
end

#jar_file_path ⇒ Object (readonly)

Returns the value of attribute jar_file_path.



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# File 'lib/glimmer/swt/image_proxy.rb', line 49

def jar_file_path
  @jar_file_path
end

#swt_image ⇒ Object (readonly)

Returns the value of attribute swt_image.



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# File 'lib/glimmer/swt/image_proxy.rb', line 49

def swt_image
  @swt_image
end

Class Method Details

.create(*args) ⇒ Object 



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# File 'lib/glimmer/swt/image_proxy.rb', line 37

def create(*args)
  if args.size == 1 && args.first.is_a?(ImageProxy)
    args.first
  else
    new(*args)
  end
end

Instance Method Details

#disposed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/glimmer/swt/image_proxy.rb', line 141

def disposed?
  @swt_image.isDisposed
end

#gc ⇒ Object 



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# File 'lib/glimmer/swt/image_proxy.rb', line 133

def gc
  @gc ||= reset_gc
end

#get_attribute(attribute_name) ⇒ Object 



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# File 'lib/glimmer/swt/image_proxy.rb', line 169

def get_attribute(attribute_name)
  if @swt_image.respond_to?(attribute_getter(attribute_name))
    @swt_image.send(attribute_getter(attribute_name))
  elsif @swt_image.respond_to?(ruby_attribute_getter(attribute_name))
    @swt_image.send(ruby_attribute_getter(attribute_name))
  elsif @swt_image.respond_to?(attribute_name)
    @swt_image.send(attribute_name)
  elsif respond_to?(ruby_attribute_getter(attribute_name))
    send(ruby_attribute_getter(attribute_name))
  else
    send(attribute_name)
  end
end

#has_attribute?(attribute_name, *args) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/glimmer/swt/image_proxy.rb', line 145

def has_attribute?(attribute_name, *args)
  @swt_image.respond_to?(attribute_setter(attribute_name), args) || respond_to?(ruby_attribute_setter(attribute_name), args)
end

#input_stream ⇒ Object 



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# File 'lib/glimmer/swt/image_proxy.rb', line 111

def input_stream
  if @file_path.start_with?('uri:classloader')
    @jar_file_path = @file_path
    file_path = @jar_file_path.sub(/^uri\:classloader\:/, '').sub('//', '/') # the latter sub is needed for Mac
    object = java.lang.Object.new
    file_input_stream = object.java_class.resource_as_stream(file_path)
  else
    file_input_stream = java.io.FileInputStream.new(@file_path)
  end
  java.io.BufferedInputStream.new(file_input_stream) if file_input_stream
end

#post_add_content ⇒ Object 



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# File 'lib/glimmer/swt/image_proxy.rb', line 96

def post_add_content
  if shapes.any?
    setup_shape_painting
  end
  if @parent.respond_to?('image=')
    @parent&.image = swt_image
  end
end

#reset_gc ⇒ Object 



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# File 'lib/glimmer/swt/image_proxy.rb', line 137

def reset_gc
  @gc = org.eclipse.swt.graphics.GC.new(swt_image)
end

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

Returns:

  • (Boolean) 


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# File 'lib/glimmer/swt/image_proxy.rb', line 190

def respond_to?(method, *args, &block)
  super || swt_image.respond_to?(method, *args, &block)
end

#scale_to(width, height) ⇒ Object 



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# File 'lib/glimmer/swt/image_proxy.rb', line 123

def scale_to(width, height)
  return if @image_data.width == width && @image_data.height == height
  scaled_image_data = @original_image_data.scaledTo(width, height)
  device = swt_image.device
  swt_image.dispose
  @swt_image = Image.new(device, scaled_image_data)
  @image_data = @swt_image.image_data
  self
end

#set_attribute(attribute_name, *args) ⇒ Object 



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# File 'lib/glimmer/swt/image_proxy.rb', line 149

def set_attribute(attribute_name, *args)
  # TODO consider refactoring/unifying this code with WidgetProxy and elsewhere
  if args.count == 1
    if args.first.is_a?(Symbol) || args.first.is_a?(String)
      args[0] = ColorProxy.new(args.first).swt_color
    end
    if args.first.is_a?(ColorProxy)
      args[0] = args.first.swt_color
    end
  end

  if @swt_image.respond_to?(attribute_setter(attribute_name))
    @swt_image.send(attribute_setter(attribute_name), *args) unless @swt_image.send(attribute_getter(attribute_name)) == args.first
  elsif @swt_image.respond_to?(ruby_attribute_setter(attribute_name))
    @swt_image.send(ruby_attribute_setter(attribute_name), args)
  else
    send(ruby_attribute_setter(attribute_name), args)
  end
end

#shape(parent_proxy = nil, args = nil) ⇒ Object 



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# File 'lib/glimmer/swt/image_proxy.rb', line 105

def shape(parent_proxy = nil, args = nil)
  parent_proxy ||= @parent_proxy
  args ||= [self] # TODO consider passing args if available
  @shape ||= Glimmer::SWT::Custom::Shape.new(parent_proxy, 'image', *args)
end