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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\widgets;
use Yii;
use yii\base\Widget;
use yii\helpers\ArrayHelper;
use yii\helpers\Url;
use yii\helpers\Html;
/**
* Menu displays a multi-level menu using nested HTML lists.
*
* The main property of Menu is [[items]], which specifies the possible items in the menu.
* A menu item can contain sub-items which specify the sub-menu under that menu item.
*
* Menu checks the current route and request parameters to toggle certain menu items
* with active state.
*
* Note that Menu only renders the HTML tags about the menu. It does do any styling.
* You are responsible to provide CSS styles to make it look like a real menu.
*
* The following example shows how to use Menu:
*
* ~~~
* echo Menu::widget([
* 'items' => [
* // Important: you need to specify url as 'controller/action',
* // not just as 'controller' even if default action is used.
* ['label' => 'Home', 'url' => ['site/index']],
* // 'Products' menu item will be selected as long as the route is 'product/index'
* ['label' => 'Products', 'url' => ['product/index'], 'items' => [
* ['label' => 'New Arrivals', 'url' => ['product/index', 'tag' => 'new']],
* ['label' => 'Most Popular', 'url' => ['product/index', 'tag' => 'popular']],
* ]],
* ['label' => 'Login', 'url' => ['site/login'], 'visible' => Yii::$app->user->isGuest],
* ],
* ]);
* ~~~
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class Menu extends Widget
{
/**
* @var array list of menu items. Each menu item should be an array of the following structure:
*
* - label: string, optional, specifies the menu item label. When [[encodeLabels]] is true, the label
* will be HTML-encoded. If the label is not specified, an empty string will be used.
* - encode: boolean, optional, whether this item`s label should be HTML-encoded. This param will override
* global [[encodeLabels]] param.
* - url: string or array, optional, specifies the URL of the menu item. It will be processed by [[Url::to]].
* When this is set, the actual menu item content will be generated using [[linkTemplate]];
* otherwise, [[labelTemplate]] will be used.
* - visible: boolean, optional, whether this menu item is visible. Defaults to true.
* - items: array, optional, specifies the sub-menu items. Its format is the same as the parent items.
* - active: boolean, optional, whether this menu item is in active state (currently selected).
* If a menu item is active, its CSS class will be appended with [[activeCssClass]].
* If this option is not set, the menu item will be set active automatically when the current request
* is triggered by `url`. For more details, please refer to [[isItemActive()]].
* - template: string, optional, the template used to render the content of this menu item.
* The token `{url}` will be replaced by the URL associated with this menu item,
* and the token `{label}` will be replaced by the label of the menu item.
* If this option is not set, [[linkTemplate]] or [[labelTemplate]] will be used instead.
* - submenuTemplate: string, optional, the template used to render the list of sub-menus.
* The token `{items}` will be replaced with the rendered sub-menu items.
* If this option is not set, [[submenuTemplate]] will be used instead.
* - options: array, optional, the HTML attributes for the menu container tag.
*/
public $items = [];
/**
* @var array list of HTML attributes shared by all menu [[items]]. If any individual menu item
* specifies its `options`, it will be merged with this property before being used to generate the HTML
* attributes for the menu item tag. The following special options are recognized:
*
* - tag: string, defaults to "li", the tag name of the item container tags. Set to false to disable container tag.
*
* @see \yii\helpers\Html::renderTagAttributes() for details on how attributes are being rendered.
*/
public $itemOptions = [];
/**
* @var string the template used to render the body of a menu which is a link.
* In this template, the token `{url}` will be replaced with the corresponding link URL;
* while `{label}` will be replaced with the link text.
* This property will be overridden by the `template` option set in individual menu items via [[items]].
*/
public $linkTemplate = '<a href="{url}">{label}</a>';
/**
* @var string the template used to render the body of a menu which is NOT a link.
* In this template, the token `{label}` will be replaced with the label of the menu item.
* This property will be overridden by the `template` option set in individual menu items via [[items]].
*/
public $labelTemplate = '{label}';
/**
* @var string the template used to render a list of sub-menus.
* In this template, the token `{items}` will be replaced with the rendered sub-menu items.
*/
public $submenuTemplate = "\n<ul>\n{items}\n</ul>\n";
/**
* @var boolean whether the labels for menu items should be HTML-encoded.
*/
public $encodeLabels = true;
/**
* @var string the CSS class to be appended to the active menu item.
*/
public $activeCssClass = 'active';
/**
* @var boolean whether to automatically activate items according to whether their route setting
* matches the currently requested route.
* @see isItemActive()
*/
public $activateItems = true;
/**
* @var boolean whether to activate parent menu items when one of the corresponding child menu items is active.
* The activated parent menu items will also have its CSS classes appended with [[activeCssClass]].
*/
public $activateParents = false;
/**
* @var boolean whether to hide empty menu items. An empty menu item is one whose `url` option is not
* set and which has no visible child menu items.
*/
public $hideEmptyItems = true;
/**
* @var array the HTML attributes for the menu's container tag. The following special options are recognized:
*
* - tag: string, defaults to "ul", the tag name of the item container tags. Set to false to disable container tag.
*
* @see \yii\helpers\Html::renderTagAttributes() for details on how attributes are being rendered.
*/
public $options = [];
/**
* @var string the CSS class that will be assigned to the first item in the main menu or each submenu.
* Defaults to null, meaning no such CSS class will be assigned.
*/
public $firstItemCssClass;
/**
* @var string the CSS class that will be assigned to the last item in the main menu or each submenu.
* Defaults to null, meaning no such CSS class will be assigned.
*/
public $lastItemCssClass;
/**
* @var string the route used to determine if a menu item is active or not.
* If not set, it will use the route of the current request.
* @see params
* @see isItemActive()
*/
public $route;
/**
* @var array the parameters used to determine if a menu item is active or not.
* If not set, it will use `$_GET`.
* @see route
* @see isItemActive()
*/
public $params;
/**
* Renders the menu.
*/
public function run()
{
if ($this->route === null && Yii::$app->controller !== null) {
$this->route = Yii::$app->controller->getRoute();
}
if ($this->params === null) {
$this->params = Yii::$app->request->getQueryParams();
}
$items = $this->normalizeItems($this->items, $hasActiveChild);
if (!empty($items)) {
$options = $this->options;
$tag = ArrayHelper::remove($options, 'tag', 'ul');
if ($tag !== false) {
echo Html::tag($tag, $this->renderItems($items), $options);
} else {
echo $this->renderItems($items);
}
}
}
/**
* Recursively renders the menu items (without the container tag).
* @param array $items the menu items to be rendered recursively
* @return string the rendering result
*/
protected function renderItems($items)
{
$n = count($items);
$lines = [];
foreach ($items as $i => $item) {
$options = array_merge($this->itemOptions, ArrayHelper::getValue($item, 'options', []));
$tag = ArrayHelper::remove($options, 'tag', 'li');
$class = [];
if ($item['active']) {
$class[] = $this->activeCssClass;
}
if ($i === 0 && $this->firstItemCssClass !== null) {
$class[] = $this->firstItemCssClass;
}
if ($i === $n - 1 && $this->lastItemCssClass !== null) {
$class[] = $this->lastItemCssClass;
}
if (!empty($class)) {
if (empty($options['class'])) {
$options['class'] = implode(' ', $class);
} else {
$options['class'] .= ' ' . implode(' ', $class);
}
}
$menu = $this->renderItem($item);
if (!empty($item['items'])) {
$submenuTemplate = ArrayHelper::getValue($item, 'submenuTemplate', $this->submenuTemplate);
$menu .= strtr($submenuTemplate, [
'{items}' => $this->renderItems($item['items']),
]);
}
if ($tag === false) {
$lines[] = $menu;
} else {
$lines[] = Html::tag($tag, $menu, $options);
}
}
return implode("\n", $lines);
}
/**
* Renders the content of a menu item.
* Note that the container and the sub-menus are not rendered here.
* @param array $item the menu item to be rendered. Please refer to [[items]] to see what data might be in the item.
* @return string the rendering result
*/
protected function renderItem($item)
{
if (isset($item['url'])) {
$template = ArrayHelper::getValue($item, 'template', $this->linkTemplate);
return strtr($template, [
'{url}' => Html::encode(Url::to($item['url'])),
'{label}' => $item['label'],
]);
} else {
$template = ArrayHelper::getValue($item, 'template', $this->labelTemplate);
return strtr($template, [
'{label}' => $item['label'],
]);
}
}
/**
* Normalizes the [[items]] property to remove invisible items and activate certain items.
* @param array $items the items to be normalized.
* @param boolean $active whether there is an active child menu item.
* @return array the normalized menu items
*/
protected function normalizeItems($items, &$active)
{
foreach ($items as $i => $item) {
if (isset($item['visible']) && !$item['visible']) {
unset($items[$i]);
continue;
}
if (!isset($item['label'])) {
$item['label'] = '';
}
$encodeLabel = isset($item['encode']) ? $item['encode'] : $this->encodeLabels;
$items[$i]['label'] = $encodeLabel ? Html::encode($item['label']) : $item['label'];
$hasActiveChild = false;
if (isset($item['items'])) {
$items[$i]['items'] = $this->normalizeItems($item['items'], $hasActiveChild);
if (empty($items[$i]['items']) && $this->hideEmptyItems) {
unset($items[$i]['items']);
if (!isset($item['url'])) {
unset($items[$i]);
continue;
}
}
}
if (!isset($item['active'])) {
if ($this->activateParents && $hasActiveChild || $this->activateItems && $this->isItemActive($item)) {
$active = $items[$i]['active'] = true;
} else {
$items[$i]['active'] = false;
}
} elseif ($item['active']) {
$active = true;
}
}
return array_values($items);
}
/**
* Checks whether a menu item is active.
* This is done by checking if [[route]] and [[params]] match that specified in the `url` option of the menu item.
* When the `url` option of a menu item is specified in terms of an array, its first element is treated
* as the route for the item and the rest of the elements are the associated parameters.
* Only when its route and parameters match [[route]] and [[params]], respectively, will a menu item
* be considered active.
* @param array $item the menu item to be checked
* @return boolean whether the menu item is active
*/
protected function isItemActive($item)
{
if (isset($item['url']) && is_array($item['url']) && isset($item['url'][0])) {
$route = $item['url'][0];
if ($route[0] !== '/' && Yii::$app->controller) {
$route = Yii::$app->controller->module->getUniqueId() . '/' . $route;
}
if (ltrim($route, '/') !== $this->route) {
return false;
}
unset($item['url']['#']);
if (count($item['url']) > 1) {
$params = $item['url'];
unset($params[0]);
foreach ($params as $name => $value) {
if ($value !== null && (!isset($this->params[$name]) || $this->params[$name] != $value)) {
return false;
}
}
}
return true;
}
return false;
}
}
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