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require 'glimmer/error'
require 'glimmer/swt/widget_proxy'
require 'glimmer/ui/custom_widget'
module Glimmer
module DSL
# Represents a Glimmer DSL expression (e.g. label(:center) { ... })
#
# An expression object can interpret a keyword, args, and a block into a UI object
#
# Expressions subclasses follow the convention of using `and` and `or`
# english versino of Ruby's boolean operations. This allows easy DSL-like
# readability of the rules, and easy tagging with pd when troubleshooting.
class Expression
class << self
def dsl
@dsl ||= name.split(/::/)[-2].downcase.to_sym
end
end
# Checks if it can interpret parameters (subclass must override)
def can_interpret?(parent, keyword, *args, &block)
raise Error, "#can_interpret? must be implemented by an Expression subclass"
end
# Interprets parameters (subclass must override)
def interpret(parent, keyword, *args, &block)
raise Error, "#interpret must be implemented by an Expression subclass"
end
# Adds block content to specified parent UI object (Optional)
#
# Only expressions that receive a content block should implement
def add_content(parent, &block)
# No Op by default
end
# Checks if parent object is a widget
def widget?(parent)
parent.is_a?(Glimmer::SWT::WidgetProxy) or parent.is_a?(Glimmer::UI::CustomWidget)
end
# Checks if object is a Symbol or a String
def textual?(object)
object.is_a?(Symbol) or object.is_a?(String)
end
end
end
end
Version data entries
13 entries across 13 versions & 1 rubygems