require 'wx'

# Return a new bitmap corresponding to the specified built-in artwork
def bitmap_from_art_provider(art_id, art_client = Wx::ART_TOOLBAR, art_size = [16, 16])
  bm = Wx::Bitmap.new
  bm.copy_from_icon(Wx::ArtProvider::get_icon(art_id, art_client, art_size))
  bm
end


# The TreeCtrl dedicated to the management of articles
class ArticleTree < Wx::TreeCtrl
  
  def initialize(parent, editor, status_bar)

    super(parent, :style => Wx::TR_DEFAULT_STYLE | Wx::TR_EDIT_LABELS | Wx::TR_HIDE_ROOT)
    
    @closed = false
    @article_number = 0
    
    @editor = editor
    
    # set up the hidden root item
    @hidden_root_item = add_root "Outline"

    evt_tree_sel_changing self, :selection_changing
    evt_tree_sel_changed self, :selection_change

    evt_tree_begin_label_edit self, :begin_label_edit
    evt_tree_end_label_edit self, :end_label_edit
    
  end

  private
  
  def log message
      @editor.append_text "#{message}\n"
  end

  # Private method for handling a selection change of article
  def selection_changing(event)
#    if @label_editing
#      event.veto
#    else
#      event.skip
#    end
  end

  
  # Private method for handling a selection change of article
  def selection_change(event)
    if @closed
      # trace residual selection change after the application closure
      puts "selection change event after application closure !"
    else
      # trace selection change
      log "selection changed : #{event.old_item} => #{event.item}"
    end
  end
  
  
  # Private method for adding an article to the outline
  def add_article parent
    # add a new article
    @article_number += 1
    new_article = append_item(parent, "Article \##{@article_number}")

    # select the new article and start the rename of its default label    
    select_item new_article
    edit_label new_article
    
  end

  def begin_label_edit
    @label_editing = true
    log "begin label edit"
  end
    
  def end_label_edit
    @label_editing = false
    log "end label edit"
  end
  
  public
  
  # Acknowledge the closure of the application
  # (Required to ignore residual event on Windows platform
  # during the application closure)
  # Test case : add 2 root nodes, on the first root, add a child then close
  def close
    @closed = true
  end

  # Add a root article to the outline
  def add_root_article
#    if !@label_editing
      add_article(@hidden_root_item)
#    end
  end
  
  # Add a child article to the selected article
  def add_child_article
#    if !@label_editing && selection != 0
      add_article(selection)
#    end
  end

  # Rename the selected article
  def rename_article
    edit_label selection
  end

  # Delete the selected article (after confirmation)
  def delete_article
    # delete the selected article
    delete selection
  end

end


# The Application
Wx::App.run do
  frame = Wx::Frame.new(nil, :title => "Outliner", :size => [800, 600]) do
    
    # create the status bar
    status_bar = create_status_bar
    
    # create the toolbar
    toolbar = create_tool_bar(Wx::TB_HORIZONTAL | Wx::NO_BORDER | Wx::TB_FLAT | Wx::TB_TEXT)
    toolbar.add_tool(50, "Add Root", bitmap_from_art_provider(Wx::ART_NORMAL_FILE), "Add Root Article")
    toolbar.add_tool(55, "Add Child", bitmap_from_art_provider(Wx::ART_NORMAL_FILE), "Add Child Article")
    toolbar.add_tool(60, "Rename", bitmap_from_art_provider(Wx::ART_HELP_SETTINGS), "Rename Article")
    toolbar.add_tool(70, "Delete", bitmap_from_art_provider(Wx::ART_DELETE), "Delete Article")
    toolbar.realize

    splitter = Wx::SplitterWindow.new(self, :style => Wx::SP_BORDER) do
      set_minimum_pane_size(100)
    end
      
    article_editor = Wx::TextCtrl.new(splitter, :style => Wx::TE_MULTILINE)
    article_editor.disable
    article_tree = ArticleTree.new(splitter, article_editor, status_bar)

    # handle the 'Add Root' toolbar button
    evt_tool(50) { article_tree.add_root_article }
    # handle the 'Add Child' toolbar button
    evt_tool(55) { article_tree.add_child_article }
    # handle the 'Rename' toolbar button
    evt_tool(60) { article_tree.rename_article }
    # handle the 'Delete' toolbar button
    evt_tool(70) { article_tree.delete_article }
    
    # handle the closure of the application (after confirmation)
    evt_close do |e|
      # notify the article tree of the application closure
      article_tree.close
      e.skip
    end
    
    splitter.split_vertically(article_tree, article_editor, 200)
    
  end
  
  frame.show
  
end

puts "Outliner exited"