Non-modal pop-up dialog in JRuby/SWT

non_modal.rb

import org.eclipse.swt.custom.StyledText
import org.eclipse.swt.custom.StyleRange

class KeyListener

  def initialize(shell)
    @shell = shell
  end

  def key_pressed(e)
    @shell.dispose
  end

  def key_released(e)
  end
end

def modeless_message(title,message,width=250,height=100)
  parent = Redcar::ApplicationSWT.display
  shell  = Swt::Widgets::Shell.new(parent, Swt::SWT::MODELESS)
  layout = Swt::Layout::GridLayout.new
  layout.marginHeight    = 0
  layout.marginWidth     = 0
  layout.verticalSpacing = 0
  shell.setLayout(layout)
  shell.set_size(width,height)

  text = StyledText.new(shell, Swt::SWT::WRAP)
  text.setLayoutData(Swt::Layout::GridData.new(Swt::Layout::GridData::FILL_BOTH))
  text.set_editable false
  new_line = "\n\n"
  new_line = "\r\n\r\n" if Redcar.platform == :windows
  text.set_text(title + new_line + message)
  style1 = StyleRange.new
  style1.start = 0
  style1.length = title.split(//).length
  style1.fontStyle = Swt::SWT::BOLD
  style1.foreground = parent.getSystemColor(Swt::SWT::COLOR_WHITE)
  text.setStyleRange(style1)
  text.set_margins(2,2,2,2)
  text.setBackground(Swt::Graphics::Color.new(parent, 230, 240, 255))
  text.setLineBackground(0, 1, Swt::Graphics::Color.new(parent, 135, 178, 247))
  text.set_caret(nil)
  text.add_key_listener(KeyListener.new(shell))

  x, y = Redcar.gui.dialog_adapter.send(:get_coordinates, :cursor)
  shell.set_location(x,y)

  shell.open
end