A File Chooser for Ruby Processing

Until I get round to implementing a file chooser library here is jruby example you might like to use in ruby-processing.

require 'rbconfig'
require 'pathname'

System = Java::JavaLang::System
JFile = Java::JavaIo::File
JXChooser = Java::javax::swing::JFileChooser

class ImageFilter < Java::javax::swing::filechooser::FileFilter
  def accept fobj
    return [".png",".jpg"].include? File.extname(fobj.to_s).downcase
    return fobj.isDirectory
  end

  def getDescription
    "Image Files"
  end
end


# Detect OS
OS = case RbConfig::CONFIG['host_os']
  when /darwin/      then :mac
  when /mswin|mingw/ then :windows
else
  :unix
end

# Asks the user to choose an editor.
# Returns either a Pathname object or nil (if canceled)
def pick_image
  # Create a FileChooser
  fc = JXChooser.new("Image Chooser")
  fc.set_dialog_title("Please select an image")
  fc.setFileFilter ImageFilter.new
  
  if :mac == OS
    fc.setCurrentDirectory(JFile.new(System.getProperty("user.home") << "/Pictures"))
  elsif :windows == OS
    fc.setCurrentDirectory(JFile.new(System.getProperty("user.dir")))
  else
    fc.setCurrentDirectory(JFile.new(System.getProperty("user.home")))
  end

  success = fc.show_open_dialog(nil)
  if success == JXChooser::APPROVE_OPTION
    return Pathname.new(fc.get_selected_file.get_absolute_path)
  else
    nil
  end
end

puts "The user picked: #{pick_image}"

# EOF