#!/usr/bin/perl
#**************************************************************************
# demo --  Simple PerlMenu demo
#
# Notes:   Perl4 - Requires curseperl
#          Perl5 - Requires William Setzer's "Curses" extension
#
#          Demonstrates "latched" (remembered) menu position technique
#          in "long" menu routine.
#
# Author:  Steven L. Kunz
#          Networked Applications
#          Iowa State University Computation Center
#          Ames, IA  50011
#          Email: skunz@iastate.edu
#
# Date:    February 1997
#**************************************************************************

# Perl5+Curses ONLY!
# Comment these lines for use with Perl4/curseperl
BEGIN { $Curses::OldCurses = 1; }
use Curses;			# PerlMenu needs "Curses"
use perlmenu;			# Main menu package (Perl5 only)
require "./menuutil.pl";	# For "pause" and "print_nl" routines.

# Perl4/curseperl ONLY!
# Uncomment these lines for use with Perl4/curseperl
# (Did you remember to run "create_menu.pl"?)
#require "./menu.pl";		# Main menu package (Perl4 only)
#require "./menuutil.pl";	# For "pause" and "print_nl" routines.

$| = 1;				# Flush after every write to stdout

$window = &initscr();
&menu_curses_application($window);
&menu_quit_routine("endwin");

# Uncomment this line to enable shell-escapes.
# If your shell does not have a "SHELL" environment variable, replace the
# call parameter with something like "/bin/sh".
# &menu_shell_command($ENV{"SHELL"});

# Default prefs active at start
  $numbered_flag = 1;		# Numbered menus
  $num_pref = "numbered";
  $gopher_pref = "default";	# Non-gopherlike arrows/scrolling
  $gopher_flag = 0;
  $mult_pref = "single";	# Single column menus
  $mult_flag = 0;
  $arrow_pref = "arrow";	# Arrow selection indicator menus
  $arrow_flag = 0;

  $menu_default_top = 0;	# Storage for mainline top item number.
  $menu_default_row = 0;	# Storage for mainline arrow location.
  $menu_default_col = 0;	# Storage for mainline arrow location.
  $row = $col = 0;		# Storage for row/col for menuutil.pl
  $title_cnt = 0;		# To trigger different subtitles/bottom titles

  while (1) {
    &menu_init($numbered_flag,"PerlMenu Version 4.0",0,"",
	"-Copyright 1992-97, Iowa State University, Ames, Iowa (USA)",
        "main_menu_help");
    &menu_paint_file("./paint_text",0);
    &menu_item("Exit this demo","exit");
    &menu_item("See a single-page menu demo","test_short_menu");
    &menu_item("See a multiple-page menu demo","test_long_menu");
    &menu_item("See a radio-button menu demo","test_radio_menu");
    &menu_item("See a multiple-selection menu demo","test_mult_menu");
    &menu_item("See a menu demo with sub-titles","test_subtitle_menu");
    &menu_item("Change arrow-wrap/scrolling menu preferences","gopher_prefs");
    &menu_item("Change multiple-column menu preferences","mult_col_prefs");
    &menu_item("Change arrow/highlight selection line menu preferences","arrow_prefs");
    &menu_item("Change numbering on all menus","numbered_prefs");

    $sel = &menu_display("",$menu_default_row,$menu_default_top,$menu_default_col);

    if ($sel eq "exit") { last; }
    if ($sel eq "%EMPTY%") {
      die "Not enough screen lines to display demo menu\n";
    }
    if ($sel ne "%UP%") { 
      &$sel(); # Note that this assumes the "action_text" is a subroutine name	
    }
  }
  &endwin;
  exit;

#
# Help routine for items on main menu panel
#
sub main_menu_help {
  local($item_text,$item_tag) = @_;

  &top_title("PerlMenu -- Demo Help Screen for Specific Menu Items");
  &print_nl("Selection \"$item_text\"",2);
  if ($item_tag eq "exit") {
    &print_nl("Selecting this item will immediately exit this demo.",1);
  }
  elsif ($item_tag eq "test_short_menu") {
    &print_nl("A single-page menu has a few items which fit on one screen.",1);
    &print_nl("No wrapping or scrolling of the menu occurs.",1);
    &print_nl("",1);
  }
  elsif ($item_tag eq "test_long_menu") {
    &print_nl("A long menu has items that span several pages.",1);
    &print_nl("Wrapping and scrolling of the menu occurs.",1);
  }
  elsif ($item_tag eq "test_radio_menu") {
    &print_nl("Radio-button menus have selection boxes in front of each item.",1);
    &print_nl("Only one item can be checked at a time.",1);
  }
  elsif ($item_tag eq "test_mult_menu") {
    &print_nl("A multiple-selection menu provides a list of several items.",1);
    &print_nl("One or more items and be selected.",1);
    &print_nl("In addition, some items can be pre-selected or locked out.",1);
    &print_nl("Selection can be based on string-matching.",1);
  }
  elsif ($item_tag eq "test_subtitle_menu") {
    &print_nl("Several sub-title and bottom title options are available.",1);
    &print_nl("This selection demonstates them.",1);
  }
  elsif ($item_tag eq "prefs") {
    &print_nl("The PerlMenu designer can provide actions based on overall preferences.",1);
    &print_nl("This demo shows some of the arrow-key wrapping modes available.",1);
  }

  &pause("(Press any key to exit help)");
}

#
#  Build a short (one page) demo menu.
#
sub test_short_menu {
  local($sel);

  while (1) {

# Init a numbered menu with a title
    &menu_init($numbered_flag,"Short Menu (fits on one page)");

# Add item to return to main menu.
    &menu_item("(Exit)","exit");

# Add several items
    &menu_item("Dog","animal");
    &menu_item("Cat","animal");
    &menu_item("Granite","mineral");
    &menu_item("Mouse","animal");
    &menu_item("Shale","mineral");
    &menu_item("Onion","vegetable");
    &menu_item("Carrot","vegetable");

# Display menu and process selection.
# Note that the previous position is not remembered because parms 2 and 3 
# are not supplied to store values used on subsequent call.
    $sel= &menu_display("");

    if (($sel eq "%UP%") || ($sel eq "exit")) { return; }
    &clear_screen();
    &pause("You picked a $sel.");
  }
}

#
# Build demo long menu (several pages)
#
sub test_long_menu {
  local($sel_num);

  local($menu_default_top) = 0; # Storage for local top menu item number.
  local($menu_default_row,$menu_default_col) = 0;     # Storage for local arrow location.

  while (1) {

# Init a numbered menu with title
    &menu_init($numbered_flag,"Long Menu (fits on several pages)");

# Add item to return to main menu.
    &menu_item("(Exit)","exit");

# Build lots of entries in the menu
    if ($mult_flag) { $max = 200; }
    else { $max = 50; }
    for ($i = 1; $i < $max; $i++) {
      $sel_num = $i + 1;
      &menu_item("Item $sel_num","action-$sel_num");
    }

# Get user selection.
# Note that local parms 2 and 3 are provided to provide storage of the
# default arrow location and top menu item on the screen for subsequent call.
    $sel = &menu_display("",$menu_default_row,$menu_default_top,$menu_default_col);

    if (($sel eq "%UP%") || ($sel eq "exit")) { return; }
    &clear_screen();
    &pause("You picked the item with selection-action $sel.");
  }
}

#
#  Build a radio-button demo menu.
#
sub test_radio_menu {
  local($sel);

# Init a numbered menu with a title
  &menu_init($numbered_flag,"Radio-button Menu");

# Add a few items
  &menu_item("Setting A","a");
  &menu_item("Setting B","b");
  &menu_item("Setting C","c");

# Display menu and process selection.
# Note that the second operand is the "current selection".
  $sel= &menu_display_radio("","a");

  if ($sel eq "%UP%") { return; }
  &clear_screen();
  &pause("You set it to $sel.");
}

#
#  Build a multiple-selection demo menu.
#
sub test_mult_menu {
  local($sel,$i,$sel_num);

# Init a numbered menu with a title and subtitle
  &menu_init($numbered_flag,"Multiple Selection Menu",0,"-Pets");

# Add a few items
  &menu_item("Dog","dog");
  &menu_item("Cat","cat");
  &menu_item("Gerbil (pre-selected)","gerbil",1);
  &menu_item("Hamster (locked out)","hamster",-1);
  &menu_item("Goldfish","goldfish");

# Display menu and process selection.
  $sel = &menu_display_mult("");

  if ($sel eq "%UP%") { return; }

# Process user selection.
# Note how "split" is used to split the multiple-selection string into
# individual pieces.
  &clear_screen();
  if ($sel eq "%NONE%") {
    &pause("(You didn't select anything)");
  } else {
    &print_nl("You selected the following:",1);
    split(/[,]/,$sel);  # Put return in @_
    foreach (@_) { &print_nl("  $_",1); }
    &pause("");
  }
}

#
# Build demo short menu (with sub-titles generated by a routine)
#
sub test_subtitle_menu {
  local($sel_num);

  local($menu_default_top) = 0; # Storage for local top menu item number.
  local($menu_default_row,$menu_default_col) = 0;     # Storage for local arrow location.

  while (1) {
    $title_cnt++;		# Jog the count

# Init a numbered menu with title, sub-titles, and bottom titles of all
# varieties.
    &menu_init($numbered_flag,"Menu with dynamic sub-titles and bottom titles",
	       0,"&sub_title_builder","&bottom_title_builder");

# Add item to return to main menu.
    &menu_item("(Exit)","exit");

# Build 25 entries in the menu
    $i = 1;
    while ($i < 25) {
      $sel_num = $i + 1;
      &menu_item("Item $sel_num","action-$sel_num");
      $i++;
    }

# Get user selection.
# Note that local parms 2 and 3 are provided to provide storage of the
# default arrow location and top menu item on the screen for subsequent call.
    $sel = &menu_display("",$menu_default_row,$menu_default_top,$menu_default_col);

    if (($sel eq "%UP%") || ($sel eq "exit")) { return; }
    &clear_screen();
    &pause("You picked the item with selection-action $sel.");
  }
}

#
# Generate variable top menu
#
sub sub_title_builder {
  if ($title_cnt > 1) {
    return("-Dynamic Subtitle Number $title_cnt");
  } else {
    return("-Top Centered\n-<Top Left-justified\n->Top Right-justified");
  }
}

#
# Generate variable bottom menu
#
sub bottom_title_builder {
  if ($title_cnt > 1) {
    return("This could say YOU HAVE $title_cnt NEW PIECES OF MAIL");
  } else {
    return("Bottom Centered\n-<Bottom Left-justified\n->Bottom Right-justified");
  }
}

#
# Toggle arrow-action/scrolling preferences
#
sub gopher_prefs {

# Init a numbered menu with a title
  &menu_init($numbered_flag,"Arrow-Wrap/Scrolling Preference Setting");

# Add secelection items
  &menu_item("Default arrow action (scrolls/nowrap)","default");
  &menu_item("More \"gopher-like\" arrow action (pages/wraps)","gopher-like");

# Display menu and process selection.
# Note that the second operand is the "current selection".
  $sel= &menu_display_radio("",$gopher_pref);

  if ($sel eq "%UP%") { return; }
  $gopher_pref = $sel;

  if ($sel eq "default") { $gopher_flag = 0; }
  else { $gopher_flag = 1; }

  &menu_prefs(0,$gopher_flag,0,"","",$mult_flag,$arrow_flag);
}

#
# Toggle multiple-column preferences
#
sub mult_col_prefs {

# Init a numbered menu with a title
  &menu_init($numbered_flag,"Multiple-column Preference Setting");

# Add secelection items
  &menu_item("Single column menus","single");
  &menu_item("Multiple column menus","multiple");

# Display menu and process selection.
# Note that the second operand is the "current selection".
  $sel= &menu_display_radio("",$mult_pref);

  if ($sel eq "%UP%") { return; }
  $mult_pref = $sel;

  if ($sel eq "single") { $mult_flag = 0; }
  else { $mult_flag = 1; }

  &menu_prefs(0,$gopher_flag,0,"","",$mult_flag,$arrow_flag);
}

#
# Toggle arrow/highlight selection cursor preferences
#
sub arrow_prefs {

# Init a menu with a title
  &menu_init($numbered_flag,"Arrow/Highlighted Selection Cursor Preference");

# Add secelection items
  &menu_item("Arrow in front of selection text","arrow");
  &menu_item("Highlighted selection text","highlight");

# Display menu and process selection.
# Note that the second operand is the "current selection".
  $sel= &menu_display_radio("",$arrow_pref);

  if ($sel eq "%UP%") { return; }
  $arrow_pref = $sel;

  if ($sel eq "arrow") { $arrow_flag = 0; }
  else { $arrow_flag = 1; }

  &menu_prefs(0,$gopher_flag,0,"","",$mult_flag,$arrow_flag);
}

#
# Toggle numbered/unnumbered for this demo
# NOTE THAT THIS IS NOT A "MENU_PREF" PREFERENCE SETTING
#
sub numbered_prefs {

# Init a numbered menu with a title
  &menu_init($numbered_flag,"Numbered/Unnumbered Control");

# Add selection items
  &menu_item("Numbered menus","numbered");
  &menu_item("Unnumbered menus","unnumbered");

# Display menu and process selection.
# Note that the second operand is the "current selection".
  $sel = &menu_display_radio("",$num_pref);

  if ($sel eq "%UP%") { return; }
  $num_pref = $sel;

  if ($sel eq "numbered") { $numbered_flag = 1; }
  else { $numbered_flag = 0; }
}