#!/usr/local/bin/ruby -w
# Sample Application for Ruby/GTK - gtk-xmlviewer.rb
# Beispielprogramm fuer Ruby/GTK -gtk-xmlviewer.rb

require 'gtk'
require 'nqxml/treeparser'

class XMLViewer < Gtk::Window
  def initialize
      super(Gtk::WINDOW_TOPLEVEL)
      set_title('Ruby/Gtk XML Viewer')
      set_usize(600, 400)
      
      menubar = createMenubar
      
      @treeList = Gtk::Tree.new
      @treeList.show
      
      @columnList = Gtk::CList.new(['Attribut', 'Wert'])
      @columnList.show
      
      bottom = Gtk::HBox.new(false, 0)
      bottom.pack_start(@treeList, true, true, 0)
      bottom.pack_start(@columnList, true, true, 0)
      bottom.show
      
      contents = Gtk::VBox.new(false, 0)
      contents.pack_start(menubar, false, false, 0)
      contents.pack_start(bottom, true, true, 0)
      add(contents)
      contents.show
      
      signal_connect(Gtk::Widget::SIGNAL_DELETE_EVENT) { exit }
   end
   
   def createMenubar
       menubar = Gtk::MenuBar.new
       
       fileMenuItem = Gtk::MenuItem.new("Datei")
       fileMenu = Gtk::Menu.new
       
       openItem = Gtk::MenuItem.new("Öffnen...")
       openItem.signal_connect(Gtk::MenuItem::SIGNAL_ACTIVATE) {
	  openDocument
        }
	openItem.show
	fileMenu.add(openItem)
	
	quitItem = Gtk::MenuItem.new("Beenden")
	quitItem.signal_connect(Gtk::MenuItem::SIGNAL_ACTIVATE)  { exit }
	quitItem.show
	fileMenu.add(quitItem)
	
	fileMenuItem.set_submenu(fileMenu)
	fileMenuItem.show
	
	helpMenuItem = Gtk::MenuItem.new("Hilfe")
	helpMenu = Gtk::Menu.new
	
	aboutItem = Gtk::MenuItem.new("Über..")
	aboutItem.signal_connect(Gtk::MenuItem::SIGNAL_ACTIVATE)  {
	    showMessageBox('Über XMLViewer', 'Ruby/GTK Beispielprogramm')
	}
	aboutItem.show
	helpMenu.add(aboutItem)
	
	helpMenuItem.set_submenu(helpMenu)
	helpMenuItem.show
	
	menubar.append(fileMenuItem)
	menubar.append(helpMenuItem)
	menubar.show
	menubar
    end
    
    def selectItem(entity)
        @columnList.clear
	if entity.kind_of?(NQXML::NamedAttributes)
	  keys = entity.attrs.keys.sort
	  keys.each { |key|
	      @columnList.append([key, entity.attrs[key]])
	  }
	end
     end
     
     def populateTreeList(docRootNode, treeRoot)
       entity = docRootNode.entity
       if entity.instance_of?(NQXML::Tag)
         treeItem = Gtk::TreeItem.new(entity.to_s)
	 treeRoot.append(treeItem)
	 if docRootNode.children.length > 0
	   subTree = Gtk::Tree.new
	   treeItem.set_subtree(subTree)
	    docRootNode.children.each do |node|
	       populateTreeList(node, subTree)
	    end
         end
       treeItem.signal_connect(Gtk::Item::SIGNAL_SELECT)  {
         selectItem(entity)
        }
	treeItem.show
      elsif entity.instance_of?(NQXML::Text)  &&
	     entity.to_s.strip.length != 0
	treeItem = Gtk::TreeItem.new(entity.to_s)
	treeRoot.append(treeItem)
	treeItem.signal_connect(Gtk::Item::SIGNAL_SELECT)  {
	    selectItem(entity)
	 }
	 treeItem.show
       end
     end
     
     def loadDocument(filename)
	 @document = nil
	 begin
	    @document = NQXML::TreeParser.new(File.new(filename)).document
	    rescue NQXML::ParserError => ex
	       showMessageBox("Fehler", "XML Document kann nicht geparst werden")
	    end
	    if @document
	       @treeList.children.each { |child|
	          @treeList.remove_child(child)
		}
		populateTreeList(@document.rootNode, @treeList)
	    end
       end
       
       def openDocument
           dlg =Gtk::FileSelection.new('Öffnen Datei')
	   dlg.ok_button.signal_connect(Gtk::Button::SIGNAL_CLICKED) {
	      dlg.hide
	      filename =dlg.get_filename
	      loadDocument(filename) if filename
	   }
	   dlg.cancel_button.signal_connect(Gtk::Button::SIGNAL_CLICKED) {
	      dlg.hide
	   }
	   dlg.show
	end
	
	def showMessageBox(title, msg)
	   msgBox = Gtk::Dialog.new
	   
	   msgLabel = Gtk::Label.new(msg)
	   msgLabel.show
	   
	   okButton = Gtk::Button.new('OK')
	   okButton.show
	   okButton.signal_connect(Gtk::Button::SIGNAL_CLICKED) {
	      msgBox.hide
	    }
	    
	    msgBox.set_usize(250, 100)
	    msgBox.vbox.pack_start(msgLabel)
	    msgBox.action_area.pack_start(okButton)
	    msgBox.set_title(title)
	    msgBox.show
	end
    end
      
      if $0 == __FILE__
        mainWindow = XMLViewer.new
	mainWindow.show
	Gtk::main
end
	   
	
       
       