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TITLE       = tut-gtk2-treev-kbda
KEYWORD     = 
= The Tree View Widget
{{link "tut-gtk2-treev-prbrr", "tut-gtk2-treev", "tut-gtk", "tut-gtk2-treev-tyu"}}

== Keyboard Accelerator Renderers

{{image_right("treev-kbda-01.png")}}

Gtk::CellRendererAccel widget displays textual representation of a keyboard accelerator keys. It allows you to dynamically edit the accelerator, hence changing it's binding for the application. To edit the accelerator user must click on the "Accelerator" cell. The cell will then accept a new key combination user enters. The new key code will be added, along with any mask keys such as Ctrl, 
Alt, Shift or any combination of these. In fact the new key combination the user presses will be displayed.

Following is the example program:

{{br}}
((*accelerators.rb*))

 #!/usr/bin/env ruby
 require 'gtk2'

 # Add three columns to the Gtk::TreeView. All three of the
 # columns will be displayed as text, although one is a Boolean
 # value and another is an integer.
 def setup_tree_view(treeview)
   # Create a new GtkCellRendererText, add it to the tree
   # view column and append the column to the tree view.
   renderer = Gtk::CellRendererText.new
   column = Gtk::TreeViewColumn.new("Action", renderer, "text" => Accl::ACTION)
   treeview.append_column(column)
   renderer = Gtk::CellRendererAccel.new
   column = Gtk::TreeViewColumn.new(
                 "Accelerator", renderer,
                 "accel_mods" => Accl::MASK,
                 "accel_key" => Accl::VALUE
   )
   # BUG: Gtk::CellRendererAccel::MODE_GTK is undefined
   # renderer.accel_mode = Gtk::CellRendererAccel::MODE_GTK 
   renderer.accel_mode = 0 # BUG: Gtk::CellRendererAccel::MODE_GTK is undefined
   renderer.editable = true

   treeview.append_column(column) 
   renderer.signal_connect('accel_edited') do |w, path, accl_k, mask, hw_k|
     if (iter = treeview.model.get_iter(path))
       iter[Accl::MASK] = mask
       iter[Accl::VALUE] = accl_k
     end
   end
 end

 window = Gtk::Window.new(Gtk::Window::TOPLEVEL)
 window.resizable = true
 window.title = "Accelerator Keys"
 window.border_width = 10
 window.signal_connect('delete_event') { Gtk.main_quit }
 window.set_size_request(250, 175)

 class Accl
   attr_accessor :action, :mask, :value
   def initialize(a, m, v); @action, @mask, @value = a, m, v; end
   ACTION = 0; MASK = 1; VALUE = 2
 end

 list = [
   Accl.new("Cut",   Gdk::Window::CONTROL_MASK, Gdk::Keyval::GDK_X),
   Accl.new("Copy",  Gdk::Window::CONTROL_MASK, Gdk::Keyval::GDK_C),
   Accl.new("Paste", Gdk::Window::CONTROL_MASK, Gdk::Keyval::GDK_V),
   Accl.new("New",   Gdk::Window::CONTROL_MASK, Gdk::Keyval::GDK_N),
   Accl.new("Open",  Gdk::Window::CONTROL_MASK, Gdk::Keyval::GDK_O),
   Accl.new("Print", Gdk::Window::CONTROL_MASK, Gdk::Keyval::GDK_P),
 ]

 treeview = Gtk::TreeView.new
 setup_tree_view(treeview)

 # Create a new tree model with three columns, as Boolean,
 # integer and string.
 store = Gtk::ListStore.new(String, Integer, Integer)

 # Add all of the products to the GtkListStore.
 list.each_with_index do |e, i|
     iter = store.append
     store.set_value(iter, Accl::ACTION, list[i].action)
     store.set_value(iter, Accl::MASK,   list[i].mask)
     store.set_value(iter, Accl::VALUE,  list[i].value)
     iter.next!
 end

 # Add the tree model to the tree view
 treeview.model = store

 scrolled_win = Gtk::ScrolledWindow.new
 scrolled_win.add(treeview)
 scrolled_win.set_policy(Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC)

 window.add(scrolled_win)
 window.show_all
 Gtk.main

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