Module: Glimmer::SWT::Custom::Drawable

Included in:
DisplayProxy, ImageProxy, WidgetProxy
Defined in:
lib/glimmer/swt/custom/drawable.rb

Overview

Represents SWT drawable controls (widgets like canvas) and display

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#image_double_buffered ⇒ Object Also known as: image_double_buffered?

Returns the value of attribute image_double_buffered.



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# File 'lib/glimmer/swt/custom/drawable.rb', line 27

def image_double_buffered
  @image_double_buffered
end

#requires_shape_disposal ⇒ Object Also known as: requires_shape_disposal?

Returns the value of attribute requires_shape_disposal.



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# File 'lib/glimmer/swt/custom/drawable.rb', line 27

def requires_shape_disposal
  @requires_shape_disposal
end

Instance Method Details

#add_shape(shape) ⇒ Object 



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

def add_shape(shape)
  if !@image_double_buffered || shape.args.first == @image_proxy_buffer
    shapes << shape
  else
    image_buffered_shapes << shape
  end
end

#clear_shapes ⇒ Object 



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

def clear_shapes
  # Optimize further by having a collection of disposable_shapes independent of shapes, which is much smaller and only has shapes that require disposal (shapes with patterns or image)
  shapes.dup.each(&:dispose) if requires_shape_disposal?
end

#deregister_shape_painting ⇒ Object 



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# File 'lib/glimmer/swt/custom/drawable.rb', line 54

def deregister_shape_painting
  @paint_listener_proxy&.deregister
end

#image_buffered_shapes ⇒ Object 



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

def image_buffered_shapes
  @image_buffered_shapes ||= []
end

#setup_shape_painting ⇒ Object Also known as: resetup_shape_painting 



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# File 'lib/glimmer/swt/custom/drawable.rb', line 58

def setup_shape_painting
  # TODO consider performance optimization relating to order of shape rendering (affecting only further shapes not previous ones)
  if @paint_listener_proxy.nil?
    shape_painter = lambda do |paint_event|
      shape_painting_work = lambda do |paint_event|
        paintable_shapes = @image_double_buffered ? image_buffered_shapes : shapes
        paintable_shapes.each do |shape|
          shape.paint(paint_event)
        end
      end
      if @image_double_buffered
        if @image_proxy_buffer.nil?
          swt_image = Image.new(DisplayProxy.instance.swt_display, bounds.width, bounds.height)
          @image_proxy_buffer = ImageProxy.new(swt_image: swt_image)
          shape_painting_work.call(@image_proxy_buffer)
        end
        @image_proxy_buffer.shape(self).paint(paint_event)
      else
        shape_painting_work.call(paint_event)
      end
    end
    
    # TODO consider making this logic polymorphic (image vs other)
    if respond_to?(:swt_image)
      shape_painter.call(self) # treat self as paint event since image has its own gc and doesn't do repaints (it's a one time deal for now though could be adjusted in the future.)
    else
      @paint_listener_proxy = on_swt_paint(&shape_painter)
    end
  else
    redraw if @finished_add_content && !is_disposed
  end
end

#shapes ⇒ Object 



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# File 'lib/glimmer/swt/custom/drawable.rb', line 33

def shapes
  @shapes ||= []
end