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# GDBToolBar
# 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 toolbar.
#
#   PUBLIC ATTRIBUTES:
#
#
#   METHODS:
#
#     configure ....... used to change public attributes
#
#   PRIVATE METHODS
#
#   X11 OPTION DATABASE ATTRIBUTES
#
#
# ----------------------------------------------------------------------

class GDBToolBar {
  inherit itk::Widget

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

    # Make a subframe so that the menu can't accidentally conflict
    # with a name created by some subclass.
    set ButtonFrame [frame $itk_interior.t]

    pack $ButtonFrame $itk_interior -fill both -expand true

    eval itk_initialize $args
  }

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

    #destroy $this
  }

  # ------------------------------------------------------------------
  #  METHOD:  show - show the toolbar
  # ------------------------------------------------------------------
  public method show {} {

    if {[llength $button_list]} {
      eval standard_toolbar $ButtonFrame $button_list
    }
  }

  # ------------------------------------------------------------------
  #  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 $type
      if {[info exists button_classes($type)]} {
        set class_list $button_classes($type)
        if {[llength $class_list]} {
          # debug "$type $state \{$class_list\}"
          foreach button $class_list {
            # debug "$type $button $state"
            itemconfigure $button -state $state
          }
        }
      }
    }
  }

  ####################################################################
  # Methods that deal with buttons.
  ####################################################################

  # ------------------------------------------------------------------
  #  METHOD:  add - Add something.
  #                 It can be a button a separator or a label.
  #
  #  type - what we want to add
  #  args - arguments appropriate to what is being added
  #
  # ------------------------------------------------------------------
  method add {type args} {

    switch $type {
      button {
        eval toolbar_add_button $args
      }
      label {
        eval toolbar_add_label $args
      }
      separator {
        toolbar_add_button_separator
      }
      default {
        error "Invalid item type: $type"
      }
    }
  }

  # ------------------------------------------------------------------
  #  PRIVATE METHOD:  toolbar_add_button - Creates a button, and inserts
  #                      it at the end of the button list.  Call this when
  #                      the toolbar is being set up, but has not yet been
  #                      made.
  # ------------------------------------------------------------------
  private method toolbar_add_button {name class command balloon args} {
    
    lappend button_list \
            [eval _register_button 1 \$name \$class \$command \$balloon $args]
    
  }

  # ------------------------------------------------------------------
  #  PRIVATE METHOD:  toolbar_add_label - Create a label to be inserted
  #                        in the toolbar.
  # ------------------------------------------------------------------

  private method toolbar_add_label {name text balloon args} {
    set lname $ButtonFrame.$name
    set Buttons($name) $lname
    set Buttons($lname,align) $button_align
    eval label $lname -text \$text $args
    balloon register $lname $balloon
    lappend button_list $lname    
  }

  # ------------------------------------------------------------------
  #  PRIVATE METHOD:  toolbar_add_button_separator - 
  # ------------------------------------------------------------------

  private method toolbar_add_button_separator {} {
    lappend button_list -
  }
 
  # ------------------------------------------------------------------
  #  PRIVATE METHOD:  _register_button - Creates all the bookkeeping
  #           for a button,  without actually inserting it in the toolbar.
  #           If the button will not be immediately inserted (INS == 0),
  #           sets its bindings and appearences to the same of a
  #           standard_toolbar button.
  # ------------------------------------------------------------------
  private method _register_button {ins name class command balloon args} {
    set bname $ButtonFrame.$name
    set Buttons($name) $bname
    set Buttons($bname,align) $button_align

    eval button $bname -command \$command $args
    balloon register $bname $balloon
    foreach elem $class {
      switch $elem {
        None {}
        default { 
          lappend button_classes($elem) $name
        }
      }
    }

   # If the button is not going to be inserted now...
   if {! $ins} {
     # This is a bit of a hack, but I need to bind the standard_toolbar bindings
     # and appearances to these externally, since I am not inserting them in 
     # the original toolbar...
     # FIXME:  Have to add a method to the libgui toolbar to do this.

     # Make sure the button acts the way we want, not the default Tk way.
     $bname configure -takefocus 0 -highlightthickness 0 \
                      -relief flat -borderwidth 1       
     set index [lsearch -exact [bindtags $bname] Button]
     bindtags $bname [lreplace [bindtags $bname] $index $index ToolbarButton]
    }

    return $bname
  }
 
  # ------------------------------------------------------------------
  #  METHOD:  create - Creates all the bookkeeping for a button,
  #           without actually inserting it in the toolbar.
  # ------------------------------------------------------------------
  method create {name class command balloon args} {

    return [eval _register_button 0 \$name \$class \$command \$balloon $args]
  }

  # ------------------------------------------------------------------
  #  METHOD:  itemconfigure - 
  # ------------------------------------------------------------------
  
  method itemconfigure {button args} {
    eval $Buttons($button) configure $args
  }

  # ------------------------------------------------------------------
  #  METHOD:  itembind - 
  # ------------------------------------------------------------------
  
  method itembind {button key cmd} {
    eval [list bind $Buttons($button) $key $cmd]
  }

  # ------------------------------------------------------------------
  #  METHOD:  itemballoon - 
  # ------------------------------------------------------------------
  
  method itemballoon {button text} {
    eval [list balloon register $Buttons($button) $text]
  }

  # ------------------------------------------------------------------
  #  PRIVATE METHOD:  toolbar_insert_button - Inserts button "name" before
  #           button "before".
  #           The toolbar must be made, and the buttons must have been
  #           created before you run this.
  # ------------------------------------------------------------------
  private method toolbar_insert_button {name before} {

    if {[string first "-" $name] == 0} {
      set name [string range $name 1 end]
      set add_sep 1
    } else {
      set add_sep 0
    }

    if {![info exists Buttons($name)] || ![info exists Buttons($before)]} {
      error "toolbar_insert_buttons called with non-existant button"
    }

    set before_col [gridCGet $Buttons($before) -column]
    set before_row [gridCGet $Buttons($before) -row]

    set slaves [grid slaves $ButtonFrame]

    set incr [expr 1 + $add_sep]
    foreach slave $slaves {
      set slave_col [gridCGet $slave -column]
      if {$slave_col >= $before_col} {
        grid configure $slave -column [expr $slave_col + $incr]
      }
    }
    if {$add_sep} {
      grid $Buttons(-$name) -column $before_col -row $before_row
    }

    # Now grid our button.  Have to put in the pady since this button
    # may not have been originally inserted by the libgui toolbar
    # proc.

    grid $Buttons($name) -column [expr $before_col + $add_sep] \
      -row $before_row -pady 2
    
  }

  # ------------------------------------------------------------------
  #  PRIVATE METHOD:  toolbar_remove_button -
  # ------------------------------------------------------------------

  private method toolbar_remove_button {name} {

    if {[string first "-" $name] == 0} {
      set name [string range $name 1 end]
      set remove_sep 1
    } else {
      set remove_sep 0
    }

    if {![info exists Buttons($name)] } {
      error "toolbar_remove_buttons called with non-existant button $name"
    }

    set name_col [gridCGet $Buttons($name) -column]
    set name_row [gridCGet $Buttons($name) -row]
    
    grid remove $Buttons($name)
    if {$remove_sep} {
      set Buttons(-$name) [grid slaves $ButtonFrame \
                             -column [expr $name_col - 1] \
                            -row $name_row]
      grid remove $Buttons(-$name)
    }

    set slaves [grid slaves $ButtonFrame -row $name_row]
    foreach slave $slaves {
      set slave_col [gridCGet $slave -column]
      if {($slave_col > $name_col)
          && ! ([info exists Buttons($slave,align)]
              && $Buttons($slave,align) == "right")} {
        grid configure $slave -column [expr $slave_col - 1 - $remove_sep]
      }
    }    
  }

  # ------------------------------------------------------------------
  #  METHOD:  toolbar_button_right_justify - 
  # ------------------------------------------------------------------
  
  method toolbar_button_right_justify {} {
    lappend button_list --
    set button_align "right"
  }

  # ------------------------------------------------------------------
  #  METHOD:  toolbar_swap_button_lists - 
  # ------------------------------------------------------------------

  method toolbar_swap_button_lists {in_list out_list} {
    # Now swap out the buttons...
    set first_out [lindex $out_list 0]
    if {[info exists Buttons($first_out)] && [grid info $Buttons($first_out)] != ""} {
      foreach button $in_list {
        toolbar_insert_button $button $first_out
      }
      foreach button $out_list {
        toolbar_remove_button $button
      }
    } elseif {[info exists Buttons($first_out)]} {
      debug "Error in swap_button_list - $first_out not gridded..."
    } else {
      debug "Button $first_out is not in button list"
    }
  }

  ####################################################################
  #
  #  PRIVATE DATA
  #
  ####################################################################

  # This is the list of buttons that are being built up
  #
  private variable button_list {}

  # This is an array of buttons names -> Tk Window names
  # and also of Tk Window names -> column position in grid
  private variable Buttons

  # This array holds the button classes.  The key is the class name,
  # and the value is the list of buttons belonging to this class.
  private variable button_classes

  # Tell if we are inserting buttons left or right justified
  private variable button_align "left"

  #The frame to contain the buttons:
  private variable ButtonFrame

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

  # None.

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

  # None.
}