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# GDBMenuBar
# Copyright 2000 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License (GPL) as published by
# the Free Software Foundation; either version 2 of the License, or (at
# your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# ----------------------------------------------------------------------
# Implements a GDB menubar.
#
#   PUBLIC ATTRIBUTES:
#
#
#   METHODS:
#
#     configure ....... used to change public attributes
#
#   PRIVATE METHODS
#
#   X11 OPTION DATABASE ATTRIBUTES
#
#
# ----------------------------------------------------------------------

class GDBMenuBar {
  inherit itk::Widget

  # ------------------------------------------------------------------
  #  CONSTRUCTOR - create widget
  # ------------------------------------------------------------------
  constructor {args} {

    set Menu [menu $itk_interior.m -tearoff 0]

    eval itk_initialize $args
  }

  # ------------------------------------------------------------------
  #  DESTRUCTOR - destroy window containing widget
  # ------------------------------------------------------------------
  destructor {

    #destroy $this
  }

  # ------------------------------------------------------------------
  #  METHOD:  show - attach menu to the toplevel window
  # ------------------------------------------------------------------
  public method show {} {
      [winfo toplevel $itk_interior] configure -menu $Menu
  }

  # ------------------------------------------------------------------
  #  METHOD:  set_class_state - standard method to control state by class
  # ------------------------------------------------------------------
  public method set_class_state {enable_list} {
    debug "Enable list is: $enable_list"

    foreach {type state} $enable_list {
      # debug $type
      if {[info exists menu_classes($type)]} {
        set class_list $menu_classes($type)
        if {[llength $class_list]} {
          # debug "$type $state \{$class_list\}"
          foreach menu $class_list {
            # debug "$type $menu $state"
            menubar_change_menu_state $menu $state
          }
        }
      }
    }
  }

  ####################################################################
  # Methods that deal with menus.
  #
  # The next set of methods control the menubar associated with the
  # toolbar.  Currently, only sequential addition of submenu's and menu
  # entries is allowed.  Here's what you do.  First, create a submenu
  # with the "new_menu" command.  This submenu is the targeted menu. 
  # Subsequent calls to add_menu_separator, and add_menu_command add
  # separators and commands to the end of this submenu.
  # If you need to edit a submenu, call clear_menu and then add all the
  # items again.
  #
  # Each menu command also has a class list.  Transitions between states
  #  of gdb will enable and disable different classes of menus.
  #
  # FIXME - support insert_command, and also cascade menus, whenever
  # we need it...
  ####################################################################

  # ------------------------------------------------------------------
  #  METHOD:  add - Add something.
  #                 It can be a menubutton for the main menu,
  #                 a separator or a command.
  #
  #  type - what we want to add
  #  args - arguments appropriate to what is being added
  #
  #  RETURNS: the cascade menu widget path.
  # ------------------------------------------------------------------
  method add {type args} {

    switch $type {
      menubutton {
        eval menubar_new_menu $args
      }
      command {
        eval menubar_add_menu_command $args
      }
      separator {
        menubar_add_menu_separator
      }
      default {
        error "Invalid item type: $type"
      }
    }

    return $current_menu
  }

  # ------------------------------------------------------------------
  #  PRIVATE METHOD:  menubar_new_menu - Add a new cascade menu to the
  #                      main menu.
  #                      Also target this menu for subsequent
  #                      menubar_add_menu_command calls.
  #
  #  name - the token for the new menu
  #  label - The label used for the label
  #  underline - the index of the underlined character for this menu item.
  #
  # ------------------------------------------------------------------
  private method menubar_new_menu {name label underline} {
    set current_menu $Menu.$name
    set menu_list($name) [$Menu add cascade -menu  $current_menu \
                             -label $label -underline $underline]
    menu $current_menu -tearoff 0
    set menu_list($name,label) $label

    set item_number -1
  }

  # ------------------------------------------------------------------
  #  PRIVATE METHOD:  menubar_add_menu_command - Adds a menu command item
  #                   to the currently targeted submenu of the main menu.
  #
  #  class - The class of the command, used for disabling entries.
  #  label - The text for the command.
  #  command - The command for the menu entry
  #  args  - Passed to the menu entry creation command (eval'ed) 
  # ------------------------------------------------------------------
  private method menubar_add_menu_command {class label command args} {

    eval $current_menu add command -label \$label -command \$command \
          $args
      
    incr item_number

    switch $class {
      None {}
      default {
        foreach elem $class {
          lappend menu_classes($elem) [list $current_menu $item_number]
        }
      }
    }
  }

  # ------------------------------------------------------------------
  #  PRIVATE METHOD:  menubar_add_menu_separator - Adds a menu separator
  #                   to the currently targeted submenu of the main menu.
  # 
  # ------------------------------------------------------------------
  private method menubar_add_menu_separator {} {
    incr item_number
    $current_menu add separator
  }

  # ------------------------------------------------------------------
  #  METHOD:  exists - Report whether a menu keyed by NAME exists.
  # 
  #  name - the token for the menu sought
  #
  #  RETURNS: 1 if the menu exists, 0 otherwise.
  # ------------------------------------------------------------------
  method exists {name} {
    return [info exists menu_list($name)]

  }

  # ------------------------------------------------------------------
  #  METHOD:  clear - Deletes the items from one of the
  #                   main menu cascade menus. Also makes this menu
  #                   the target menu.
  # 
  #  name - the token for the new menu
  #
  #  RETURNS: then item number of the menu, or "" if the menu is not found.
  #
  #  FIXME: Does not remove the deleted menus from their class lists.
  # ------------------------------------------------------------------
  method clear {name} {
    if {[info exists menu_list($name)]} {
      set current_menu [$Menu entrycget $menu_list($name) -menu]
      $current_menu delete 0 end
      set item_number -1
      return $current_menu
    } else {
      return ""
    }
  }

  # ------------------------------------------------------------------
  #  METHOD:  delete - Deletes one of the main menu
  #                    cascade menus. Also makes the previous menu the
  #                    target menu.
  # 
  #  name - the token for the new menu
  #
  #  RETURNS: then item number of the menu, or "" if the menu is not found.
  #
  #  FIXME: Does not remove the deleted menus from their class lists.
  # ------------------------------------------------------------------
  method delete {name} {
    if {[info exists menu_list($name)]} {
      $Menu delete $menu_list($name,label)
      set current_menu {}
      unset menu_list($name,label)
      unset menu_list($name)
    }
  }

  # ------------------------------------------------------------------
  # PRIVATE METHOD:  menubar_change_menu_state - Does the actual job of
  #                  enabling menus...
  #
  # INPUT:  Pass normal or disabled for the state.
  # ------------------------------------------------------------------
  private method menubar_change_menu_state {menu state} {

    [lindex $menu 0] entryconfigure [lindex $menu 1] -state $state
  }

  # ------------------------------------------------------------------
  # METHOD:  menubar_set_current_menu - Change the current_menu pointer.
  #          Returns the current value so it can be restored.
  # ------------------------------------------------------------------
  method menubar_set_current_menu {menup} {
    set saved_menu $current_menu
    set current_menu $menup
    return $saved_menu
  }

  ####################################################################
  #
  #  PRIVATE DATA
  #
  ####################################################################

  # This array holds the menu classes.  The key is the class name,
  # and the value is the list of menus belonging to this class.
  private variable menu_classes

  # This array holds the pathname that corresponds to a menu name
  private variable menu_list

  private variable item_number -1
  private variable current_menu {}

  ####################################################################
  #
  #  PROTECTED DATA
  #
  ####################################################################

  # The menu Tk widget
  protected variable Menu

  ####################################################################
  #
  #  PUBLIC DATA
  #
  ####################################################################

  # None
}