mirror of
https://github.com/yiisoft/yii2.git
synced 2025-11-04 06:37:55 +08:00
e6f5c46cdc
- Deprecated `yii\base\BaseObject::className()` in favor of native PHP syntax `::class`, which does not trigger autoloading - Deprecated XCache and Zend data cache support as caching backends - Deprecated `yii\BaseYii::powered()` method - Added `yii\base\InvalidArgumentException` and deprecated `yii\base\InvalidParamException` - Added `yii\BaseYii::debug()` and deprecated `yii\BaseYii::trace()`
323 lines
10 KiB
PHP
323 lines
10 KiB
PHP
<?php
|
|
/**
|
|
* @link http://www.yiiframework.com/
|
|
* @copyright Copyright (c) 2008 Yii Software LLC
|
|
* @license http://www.yiiframework.com/license/
|
|
*/
|
|
|
|
namespace yii\base;
|
|
|
|
use ReflectionClass;
|
|
use Yii;
|
|
|
|
/**
|
|
* Widget is the base class for widgets.
|
|
*
|
|
* For more details and usage information on Widget, see the [guide article on widgets](guide:structure-widgets).
|
|
*
|
|
* @property string $id ID of the widget.
|
|
* @property \yii\web\View $view The view object that can be used to render views or view files. Note that the
|
|
* type of this property differs in getter and setter. See [[getView()]] and [[setView()]] for details.
|
|
* @property string $viewPath The directory containing the view files for this widget. This property is
|
|
* read-only.
|
|
*
|
|
* @author Qiang Xue <qiang.xue@gmail.com>
|
|
* @since 2.0
|
|
*/
|
|
class Widget extends Component implements ViewContextInterface
|
|
{
|
|
/**
|
|
* @event Event an event that is triggered when the widget is initialized via [[init()]].
|
|
* @since 2.0.11
|
|
*/
|
|
const EVENT_INIT = 'init';
|
|
/**
|
|
* @event WidgetEvent an event raised right before executing a widget.
|
|
* You may set [[WidgetEvent::isValid]] to be false to cancel the widget execution.
|
|
* @since 2.0.11
|
|
*/
|
|
const EVENT_BEFORE_RUN = 'beforeRun';
|
|
/**
|
|
* @event WidgetEvent an event raised right after executing a widget.
|
|
* @since 2.0.11
|
|
*/
|
|
const EVENT_AFTER_RUN = 'afterRun';
|
|
|
|
/**
|
|
* @var int a counter used to generate [[id]] for widgets.
|
|
* @internal
|
|
*/
|
|
public static $counter = 0;
|
|
/**
|
|
* @var string the prefix to the automatically generated widget IDs.
|
|
* @see getId()
|
|
*/
|
|
public static $autoIdPrefix = 'w';
|
|
/**
|
|
* @var Widget[] the widgets that are currently being rendered (not ended). This property
|
|
* is maintained by [[begin()]] and [[end()]] methods.
|
|
* @internal
|
|
*/
|
|
public static $stack = [];
|
|
|
|
|
|
/**
|
|
* Initializes the object.
|
|
* This method is called at the end of the constructor.
|
|
* The default implementation will trigger an [[EVENT_INIT]] event.
|
|
*/
|
|
public function init()
|
|
{
|
|
parent::init();
|
|
$this->trigger(self::EVENT_INIT);
|
|
}
|
|
|
|
/**
|
|
* Begins a widget.
|
|
* This method creates an instance of the calling class. It will apply the configuration
|
|
* to the created instance. A matching [[end()]] call should be called later.
|
|
* As some widgets may use output buffering, the [[end()]] call should be made in the same view
|
|
* to avoid breaking the nesting of output buffers.
|
|
* @param array $config name-value pairs that will be used to initialize the object properties
|
|
* @return static the newly created widget instance
|
|
* @see end()
|
|
*/
|
|
public static function begin($config = [])
|
|
{
|
|
$config['class'] = get_called_class();
|
|
/* @var $widget Widget */
|
|
$widget = Yii::createObject($config);
|
|
static::$stack[] = $widget;
|
|
|
|
return $widget;
|
|
}
|
|
|
|
/**
|
|
* Ends a widget.
|
|
* Note that the rendering result of the widget is directly echoed out.
|
|
* @return static the widget instance that is ended.
|
|
* @throws InvalidCallException if [[begin()]] and [[end()]] calls are not properly nested
|
|
* @see begin()
|
|
*/
|
|
public static function end()
|
|
{
|
|
if (!empty(static::$stack)) {
|
|
$widget = array_pop(static::$stack);
|
|
if (get_class($widget) === get_called_class()) {
|
|
/* @var $widget Widget */
|
|
if ($widget->beforeRun()) {
|
|
$result = $widget->run();
|
|
$result = $widget->afterRun($result);
|
|
echo $result;
|
|
}
|
|
|
|
return $widget;
|
|
}
|
|
|
|
throw new InvalidCallException('Expecting end() of ' . get_class($widget) . ', found ' . get_called_class());
|
|
}
|
|
|
|
throw new InvalidCallException('Unexpected ' . get_called_class() . '::end() call. A matching begin() is not found.');
|
|
}
|
|
|
|
/**
|
|
* Creates a widget instance and runs it.
|
|
* The widget rendering result is returned by this method.
|
|
* @param array $config name-value pairs that will be used to initialize the object properties
|
|
* @return string the rendering result of the widget.
|
|
* @throws \Exception
|
|
*/
|
|
public static function widget($config = [])
|
|
{
|
|
ob_start();
|
|
ob_implicit_flush(false);
|
|
try {
|
|
/* @var $widget Widget */
|
|
$config['class'] = get_called_class();
|
|
$widget = Yii::createObject($config);
|
|
$out = '';
|
|
if ($widget->beforeRun()) {
|
|
$result = $widget->run();
|
|
$out = $widget->afterRun($result);
|
|
}
|
|
} catch (\Exception $e) {
|
|
// close the output buffer opened above if it has not been closed already
|
|
if (ob_get_level() > 0) {
|
|
ob_end_clean();
|
|
}
|
|
throw $e;
|
|
}
|
|
|
|
return ob_get_clean() . $out;
|
|
}
|
|
|
|
private $_id;
|
|
|
|
/**
|
|
* Returns the ID of the widget.
|
|
* @param bool $autoGenerate whether to generate an ID if it is not set previously
|
|
* @return string ID of the widget.
|
|
*/
|
|
public function getId($autoGenerate = true)
|
|
{
|
|
if ($autoGenerate && $this->_id === null) {
|
|
$this->_id = static::$autoIdPrefix . static::$counter++;
|
|
}
|
|
|
|
return $this->_id;
|
|
}
|
|
|
|
/**
|
|
* Sets the ID of the widget.
|
|
* @param string $value id of the widget.
|
|
*/
|
|
public function setId($value)
|
|
{
|
|
$this->_id = $value;
|
|
}
|
|
|
|
private $_view;
|
|
|
|
/**
|
|
* Returns the view object that can be used to render views or view files.
|
|
* The [[render()]] and [[renderFile()]] methods will use
|
|
* this view object to implement the actual view rendering.
|
|
* If not set, it will default to the "view" application component.
|
|
* @return \yii\web\View the view object that can be used to render views or view files.
|
|
*/
|
|
public function getView()
|
|
{
|
|
if ($this->_view === null) {
|
|
$this->_view = Yii::$app->getView();
|
|
}
|
|
|
|
return $this->_view;
|
|
}
|
|
|
|
/**
|
|
* Sets the view object to be used by this widget.
|
|
* @param View $view the view object that can be used to render views or view files.
|
|
*/
|
|
public function setView($view)
|
|
{
|
|
$this->_view = $view;
|
|
}
|
|
|
|
/**
|
|
* Executes the widget.
|
|
* @return string the result of widget execution to be outputted.
|
|
*/
|
|
public function run()
|
|
{
|
|
}
|
|
|
|
/**
|
|
* Renders a view.
|
|
*
|
|
* The view to be rendered can be specified in one of the following formats:
|
|
*
|
|
* - [path alias](guide:concept-aliases) (e.g. "@app/views/site/index");
|
|
* - absolute path within application (e.g. "//site/index"): the view name starts with double slashes.
|
|
* The actual view file will be looked for under the [[Application::viewPath|view path]] of the application.
|
|
* - absolute path within module (e.g. "/site/index"): the view name starts with a single slash.
|
|
* The actual view file will be looked for under the [[Module::viewPath|view path]] of the currently
|
|
* active module.
|
|
* - relative path (e.g. "index"): the actual view file will be looked for under [[viewPath]].
|
|
*
|
|
* If the view name does not contain a file extension, it will use the default one `.php`.
|
|
*
|
|
* @param string $view the view name.
|
|
* @param array $params the parameters (name-value pairs) that should be made available in the view.
|
|
* @return string the rendering result.
|
|
* @throws InvalidArgumentException if the view file does not exist.
|
|
*/
|
|
public function render($view, $params = [])
|
|
{
|
|
return $this->getView()->render($view, $params, $this);
|
|
}
|
|
|
|
/**
|
|
* Renders a view file.
|
|
* @param string $file the view file to be rendered. This can be either a file path or a [path alias](guide:concept-aliases).
|
|
* @param array $params the parameters (name-value pairs) that should be made available in the view.
|
|
* @return string the rendering result.
|
|
* @throws InvalidArgumentException if the view file does not exist.
|
|
*/
|
|
public function renderFile($file, $params = [])
|
|
{
|
|
return $this->getView()->renderFile($file, $params, $this);
|
|
}
|
|
|
|
/**
|
|
* Returns the directory containing the view files for this widget.
|
|
* The default implementation returns the 'views' subdirectory under the directory containing the widget class file.
|
|
* @return string the directory containing the view files for this widget.
|
|
*/
|
|
public function getViewPath()
|
|
{
|
|
$class = new ReflectionClass($this);
|
|
|
|
return dirname($class->getFileName()) . DIRECTORY_SEPARATOR . 'views';
|
|
}
|
|
|
|
/**
|
|
* This method is invoked right before the widget is executed.
|
|
*
|
|
* The method will trigger the [[EVENT_BEFORE_RUN]] event. The return value of the method
|
|
* will determine whether the widget should continue to run.
|
|
*
|
|
* When overriding this method, make sure you call the parent implementation like the following:
|
|
*
|
|
* ```php
|
|
* public function beforeRun()
|
|
* {
|
|
* if (!parent::beforeRun()) {
|
|
* return false;
|
|
* }
|
|
*
|
|
* // your custom code here
|
|
*
|
|
* return true; // or false to not run the widget
|
|
* }
|
|
* ```
|
|
*
|
|
* @return bool whether the widget should continue to be executed.
|
|
* @since 2.0.11
|
|
*/
|
|
public function beforeRun()
|
|
{
|
|
$event = new WidgetEvent();
|
|
$this->trigger(self::EVENT_BEFORE_RUN, $event);
|
|
return $event->isValid;
|
|
}
|
|
|
|
/**
|
|
* This method is invoked right after a widget is executed.
|
|
*
|
|
* The method will trigger the [[EVENT_AFTER_RUN]] event. The return value of the method
|
|
* will be used as the widget return value.
|
|
*
|
|
* If you override this method, your code should look like the following:
|
|
*
|
|
* ```php
|
|
* public function afterRun($result)
|
|
* {
|
|
* $result = parent::afterRun($result);
|
|
* // your custom code here
|
|
* return $result;
|
|
* }
|
|
* ```
|
|
*
|
|
* @param mixed $result the widget return result.
|
|
* @return mixed the processed widget result.
|
|
* @since 2.0.11
|
|
*/
|
|
public function afterRun($result)
|
|
{
|
|
$event = new WidgetEvent();
|
|
$event->result = $result;
|
|
$this->trigger(self::EVENT_AFTER_RUN, $event);
|
|
return $event->result;
|
|
}
|
|
}
|