Module: Sweet

Defined in:
lib/sweet/base.rb,
lib/sweet/downloader.rb

Overview

TODO create gemspec TODO evaluate integration of jface TODO enable additive and replacing :style on widget creation

Defined Under Namespace

Modules: Downloader

Constant Summary collapse

WIDGET_HACKS =

TODO integrate all standard widgets

{
  ProgressBar => {:custom_code => proc {
      def fraction=(value)
        setSelection value.to_f * maximum
      end
      def fraction
        selection / maximum
      end
    }},
  Text => {:custom_code => proc{
      def password=(value)
        self.echo_char = ?* if value
      end
      def password
        ! echo_char.nil?
      end
    }},
  CTabFolder => {:default_listener => 'CTabFolder2'}
}
DEFAULT = 
{:init_args => :text, :block_handler => SWT::Selection}
WIDGET_OPTIONS = 
{
  # Text components
  :label => {:style => SWT::WRAP, :init_args => :text},
  :edit_line => {:class => Text, :style => SWT::SINGLE | SWT::BORDER, :init_args => :text, :block_handler => :on_widget_default_selected},
  :edit_area => {:class => Text, :style => SWT::MULTI | SWT::BORDER, :init_args => :text, :block_handler => :on_widget_default_selected},

  # Buttons
  :button => DEFAULT.merge(:style => SWT::PUSH),
  :toggle_button => DEFAULT.merge(:class => Button, :style => SWT::TOGGLE),
  :radio_button => DEFAULT.merge(:class => Button, :style => SWT::RADIO),
  :check_button => DEFAULT.merge(:class => Button, :style => SWT::CHECK),
  :arrow_button => DEFAULT.merge(:class => Button, :style => SWT::ARROW),

  # Menus
  :menubar => {:class => Menu, :style => SWT::BAR},
  :popup => {:class => Menu, :style => SWT::POP_UP},
  :item => {:class => MenuItem, :style => SWT::PUSH, :init_args => :text, :block_handler => :on_widget_selected},
  :separator => {:class => MenuItem, :style => SWT::SEPARATOR},
  :submenu => {:class => MenuItem, :style => SWT::CASCADE, :init_args => :text, :block_handler => proc{|c, opts, block|
      sub = Menu.new(c.app, SWT::DROP_DOWN)
      sub.sweeten(c.app, opts, &block)
      c.menu = sub
    }
  },
  
  # Toolbars
  :tool_item => DEFAULT.merge(:style => SWT::PUSH),
  # TODO make CoolBar work
#    :cool_item => {:init_args => :control, :block_handler => proc{ |c, opts, proc|
#        c.control = proc.call
#      }},

  # Tabs
  :tab_folder => {:class => CTabFolder, :style => SWT::BORDER},
  :tab_item => {:class => CTabItem, :style => SWT::CLOSE, :init_args => [:text, :control], :block_handler => proc{|c, opts, proc|
      c.control = proc.call
    }},

  # Other components
  :tree => {:style => SWT::VIRTUAL, :block_handler => SWT::Selection},
  :progress => {:class => ProgressBar, :style => SWT::SMOOTH},
  :group => {:init_args => :text},

  # Dialogs
  :color_dialog => {:style => SWT::APPLICATION_MODAL, :init_args => :text}
}.unify
WIDGETS = 
{}
SWT_JAR = 
File.join(File.dirname(__FILE__), '../../swt/swt.jar')

Class Method Summary collapse

Class Method Details

.app(*args, &block) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/sweet/base.rb', line 95

def self.app(*args, &block)
  # prepare the arguments
  count = args.length
  name = args.first.is_a?(String) ? args.shift : 'SWEET Application'
  raise ArgumentError.new(count, 2) if args.size > 1
  opts = args.first || {}

  # build the UI
  Display.setAppName(name)
  display = Display.new

  # TODO allow multiple shells
  shell = Shell.new(display)
  shell.sweeten(display, name, opts, &block)
  shell.open

  # dispatch loop
  while (!shell.isDisposed) do
    display.sleep unless display.readAndDispatch
  end

  display.dispose
end

.create_widget(parent, name, *args, &block) ⇒ Object 



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# File 'lib/sweet/base.rb', line 119

def self.create_widget(parent, name, *args, &block)
  init = WIDGET_OPTIONS[name] || {}

  unless cls = WIDGETS[name]
    #      puts "Loading widget #{name}"
    #      filename = File.join('sweet/widget', name.to_s)
    #      begin
    #        require filename
    #      rescue LoadError
    cls = create_widget_class(name, init)
    #      end
  end

  opts = args.last.is_a?(Hash) ? args.pop.dup : {}

  style = opts.delete(:style) || init[:style] || SWT::NONE
  style = Array(style).inject(0) do |result, value|
    value = value.swt_const if value.is_a? Symbol
    result | value
  end

  Sweet.debug "Creating #{cls.java_class.simple_name}(#{parent}, #{style})"
  result = cls.new(parent, style)
  result.instance_variable_set(:@block_handler, init[:block_handler])

  if init_args = init[:init_args]
    Hash[Array(init_args).zip(args)].each do |k, v|
      opts.merge! k => v if v
    end
  end
  result.sweeten(parent.app, opts, &block)

  result
end

.create_widget_class(name, init) ⇒ Object 



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# File 'lib/sweet/base.rb', line 154

def self.create_widget_class(name, init)
  # build widget with default accessors
  class_name = init[:class] || name
  class_name = class_name.to_s.camelize(:upper) if class_name.is_a?(Symbol)
  cls = class_name.is_a?(Class) ? class_name : const_get(class_name)

  unless WIDGETS.values.member? cls
    delegate_events(cls)
    if hacks = WIDGET_HACKS[cls]
      if custom_code = hacks[:custom_code]
        cls.class_eval &custom_code
      end
    end
  end

  cls
end

.debug(text) ⇒ Object 



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# File 'lib/sweet/base.rb', line 218

def self.debug(text)
  # TODO add a decent logging mechanism
  puts text if @debug
end

.delegate_events(cls) ⇒ Object 



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# File 'lib/sweet/base.rb', line 172

def self.delegate_events(cls)
  hacks = WIDGET_HACKS[cls]
  default_listener = (hacks[:default_listener] || '').underscore if hacks

  methods = cls.java_class.java_instance_methods
  methods.each do |m|
    next unless m.name =~ /(add(.*)Listener)/
    j = $1
    n = $2.underscore
    p = m.parameter_types[0]
    evts = p.declared_instance_methods

    if evts.size == 1
      s = "on_#{n}"
      cls.send(:alias_method, s, j) unless cls.respond_to?(s)
    else
      evts.each do |evt|
        s = evt.name.underscore
        if s.split(/_/).size == 1 && n != default_listener
          s = n + "_" + s
        end
        # TODO provide addListener SWT::Xxx option
        unused_events = evts.select{ |e| e.name != evt.name }.map{ |e| "def #{e.name.underscore}(e)\nend" }.join("\n")
        cls.class_eval <<-EOF
            def on_#{s}(&block)
              l = Class.new do
                include Java.#{p}
                def initialize(&block)
                  @block = block
                end
                def #{evt.name}(e)
                  @block.call e
                end
                #{unused_events}
              end
              #{j} l.new(&block)
            end
        EOF
      end
    end
  end
end

.set_debug ⇒ Object 



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# File 'lib/sweet/base.rb', line 215

def self.set_debug
  @debug = true
end