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Date: 01/25/00
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this message was, of course, meant to go to the phplib-dev mailing
list before it ended up at phplib list... must be all that snow here,
on the east coast...
i took a shot at rewriting the menu class a bit. please take a look
and let me know what you think.
thanks!
--sasha / sasha <email protected>
info:
menu2 is similar in functionality to men.inc by kristian. i wrote menu2
to be recursive as much as possible, and extended it to provide three
types of menus: tree (i.e., cascading,), "urhere", and rows.
1. user only needs to subclass the Menu2 class and provide one data
structure represented as a nested array of menu groups and their
properties:
class mymenu extends Menu2 {
var $menumap = array(
m1 => array( url => "/menu/m1.php3", title => "menu1",
sub => array(
m11 => array( url => "/menu/m11.php3", title => "menu11",
sub => array(
m111 => array(url => "/menu/m111.php3", title => "menu111"),
m112 => array(url => "/menu/m112.php3", title => "menu112")
)),
m12 => array(url => "/menu/m12.php3", title => "menu12")
)),
m2 => array(url => "/menu/m2.php3", title => "menu2"),
m3 => array(url => "/menu/m3.php3", title => "menu3",
sub => array(
m31 => array( url => "/menu/m31.php3", title => "menu31",
sub => array(
m311 => array(url => "/menu/m311.php3", title => "menu311"),
m312 => array(url => "/menu/m312.php3", title => "menu312")
)),
m32 => array(url => "/menu/m32.php3", title => "menu32")
))
);
function mymenu() {
$this->setup();
}
}
2. user may also subclass three functions: get_cell, which draws an
actual menu cell; start_menu and end_menu which may be necessary if
the menu is enclosed in a table, etc.
3. there are 3 types of menus that can be generated: tree (standard
cascading menus);
urhere, of format "you are here: support >> systems >> pc";
or rows, where menu levels are stacked:
sales service *support* feedback
software *systems* parts
-pc- mac unix
menu2 may be used to display the same menu in multiple ways on the
same page.
4. $this->setup takes the user provided menu array and generates another
datastructure, urlmap, which creates a mapping for every valid url
to a menupath (to that url/page).
setup also calls $this->get_path which uses PHP_SELF to retrieve the
appropriate menupath for the newly created urlmap.
4. $this->show calls $this->build_menu to build the current menu as a
string that can be displayed later.
5. here is an example (that could be put in a .inc file included by all
.php pages):
$m = new mymenu;
$m -> type = 'rows'; // or urhere; tree is the default
$m -> start_menu();
$m -> show();
$m -> end_menu();
code:
<?
# menu2.inc - menu class
class Menu2 {
var $classname = "Menu2";
# menupath -> menuelement; provided by user
var $menumap = array();
# url -> menupath; built from menumap at run-time
var $urlmap = array();
# p - menu path
var $p = "";
# type - type of menu (tree, urhere, rows), default to tree
var $type = "tree";
# str - final HTML code
var $str = "";
# class - a common css class, if provided
var $class = "";
# constructor
function Menu2() {
$this->setup();
}
# prepare
function setup() {
# build urlmap
$this->build_urlmap($this->menumap, array(""));
# retrieve current menupath
$this->get_path();
}
# build and display menu
function show() {
# reinitialize str
$this->str = "";
# build menu
$this->build_menu($this->menumap, $this->p);
# print menu
print $this->str;
}
# build urlmap
function build_urlmap($m, $p) {
while(list($k, $v) = each($m)) {
$this->urlmap[$v[url]] = $p;
if ($v[sub]) {
$pp = $p; // p may still be used in loop, don't change
$pp[] = $k;
$this->build_urlmap($v[sub], $pp);
}
}
}
# get path
function get_path() {
global $PHP_SELF;
$this->p = $this->urlmap[$PHP_SELF];
}
# build menu
function build_menu($m, $p, $d=0) {
global $PHP_SELF;
reset($m);
switch ($this->type) {
case "tree": {
while(list($k, $v) = each($m)) {
if ($v[url] == $PHP_SELF) { // menu item found
$found = 1;
} elseif ($p[$d+1] == $k) { // menu subtree found
$found = 2;
} else {
$found = false; // keep going
}
$this->str .= $this->get_cell($k,$v,$d,$found);
# recurse only if matched menu subtree
if ($found && ($v[sub])) {
$this->build_menu($v[sub], $p, $d+1);
}
}
break;
}
case "urhere": {
while(list($k, $v) = each($m)) {
if ($v[url] == $PHP_SELF) { // menu item found
$found = 1;
} elseif ($p[$d+1] == $k) { // menu subtree found
$found = 2;
} else {
$found = false; // keep going
}
if ($found) {
$this->str .= $this->get_cell($k,$v,$d,$found);
if ($v[sub]) {
$this->build_menu($v[sub], $p, $d+1);
continue;
}
}
}
break;
}
case "rows": {
$this->start_menu();
while(list($k, $v) = each($m)) {
if ($v[url] == $PHP_SELF) { // menu item found
$found = 1;
} elseif ($p[$d+1] == $k) { // menu subtree found
$found = 2;
} else {
$found = false; // keep going
}
$this->str .= $this->get_cell($k,$v,$d,$found);
if ($found && ($v[sub])) { // recurse if found and has subtree
$sub = $v[sub];
}
}
$this->end_menu();
$sub ? $this->build_menu($sub, $p, $d+1) : "" ;
break;
}
} // end switch
} // end function build_menu
function concat($n, $s) {
$r = "";
for($i = $n; $i > 0; $i--) {
$r .= $s;
}
return $r;
}
#
# functions that can be subclassed
#
function get_cell ($id, $pr, $d, $found) {
$r = "";
$class = "";
$this->type == "tree" ? $ind = $this->concat($d,' ') : $ind = "";
$pr["class"] ? $class = $pr["class"] : $class = $this->class;
# if type is tree, prefix with <tr> tag
$this->type == "tree" ? $r .= "<tr>\n": "";
switch ($found) {
case 1: {
$r .= "<td class=$class>";
$r .= $ind . "$pr[title] </td>";
break;
}
case 2: {
$r .= "<td>" . $ind;
$r .= "<a href=\"$pr[url]\" class=$class>";
$r .= "<font color=blue><b>$pr[title]</b></font></a></td> \n";
# if type is urhere, postfix with a separator
if ($this->type == "urhere") {
$r .= "<td class=$class><font color=red>>></font></td>\n";
}
break;
}
default: {
$r .= "<td>" . $ind;
$r .= "<a href=\"$pr[url]\" class=$class>";
$r .= "<font color=blue>$pr[title]</font></a> </td>\n";
}
} // end switch
# if type tree, postfix with </tr> tag
$this->type == "tree" ? $r .= "</tr>\n": "";
return $r;
} // end function get_cell
function start_menu() {
switch($this->type) {
case "rows": {
$this->str .= "<table align=center cellpadding=0 border=0>\n
<tr>\n";
break;;
}
case "urhere": {
print("<!-- start menu type $this->type --> \n");
print("<table cellpadding=0 cellspacing=0 border=0 valing=top>
\n");
print("<td class=$this->class>You are here: </td>\n");
break;;
}
default: {
print("<!-- start menu type $this->type --> \n");
print("<table cellpadding=0 cellspacing=0 border=0 valing=top>
\n");
}
}
} // end function start_menu
function end_menu() {
switch($this->type) {
case "rows": {
$this->str .= "</tr>\n </table>\n";
break;;
}
default: {
print("</table> \n");
print("<!-- end menu type $this->type --> \n");
}
}
} // end function end_menu
} // end class
?>
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