54 lines
1.4 KiB
PHP
54 lines
1.4 KiB
PHP
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<?php
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class Signaler {
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private $_listeners = array();
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protected static $current = false;
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static public function connect(Signaler &$emitter, $signal, &$responder, $slot) {
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if( !is_object($responder) ) {
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return false;
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}
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elseif( !method_exists($responder, $slot) ) {
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return false;
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}
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if( !array_key_exists($signal, $emitter->_listeners) ) {
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$emitter->_listeners[$signal] = array();
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}
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$emitter->_listeners[$signal][] = array(
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'object' => &$responder,
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'method' => $slot
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);
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}
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protected function emit() {
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self::$current = &$this;
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$args = func_get_args();
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if( count($args) == 0 ) {
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// Called without any arguments, raise an error
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return false;
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}
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$signal = array_shift($args);
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$sent = 0;
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if( array_key_exists($signal, $this->_listeners) ) {
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foreach( $this->_listeners[$signal] as $key => $listener ) {
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if(
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!is_object($listener['object'])
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|| !method_exists($listener['object'], $listener['method'])
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) {
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// Something happened to the object since it was connected,
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// and it is no longer usable. Drop it.
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unset($this->_listeners[$key]);
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} else {
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// Everything's good, set the callback loose.
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$result = call_user_func_array(array($listener['object'], $listener['method']), $args);
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if( $result !== false ) {
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$sent++;
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}
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}
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}
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}
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// Special signal for debugging purposes
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if( $signal !== '__emit' ) { $this->emit('__emit', $signal, $args); }
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return $sent;
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}
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}
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?>
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