147 lines
4.9 KiB
JavaScript
147 lines
4.9 KiB
JavaScript
'use strict';
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/************************************************************************
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## events Module
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The Events module provides a thin wrapper around Bukkit's
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Event-handling API. Bukkit's Events API makes use of Java Annotations
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which are not available in Javascript, so this module provides a
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simple way to listen to minecraft events in javascript.
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### events.on() static method
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This method is used to register event listeners.
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#### Parameters
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* eventName - A string or java class. If a string is supplied it must
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be part of the Bukkit event class name. See [Bukkit API][buk] for
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details of the many bukkit event types. When a string is supplied
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there is no need to provide the full class name - you should omit
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the 'org.bukkit.event' prefix. e.g. if the string
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"block.BlockBreakEvent" is supplied then it's converted to the
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org.bukkit.event.block.BlockBreakEvent class .
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If a java class is provided (say in the case where you've defined
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your own custom event) then provide the full class name (without
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enclosing quotes).
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* callback - A function which will be called whenever the event
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fires. The callback should take a single parameter, event (the event fired).
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* priority (optional - default: "HIGHEST") - The priority the
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listener/callback takes over other listeners to the same
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event. Possible values are "HIGH", "HIGHEST", "LOW", "LOWEST",
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"NORMAL", "MONITOR". For an explanation of what the different
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priorities mean refer to bukkit's [Event API Reference][buk2].
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#### Returns
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An object which can be used to unregister the listener.
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#### Example:
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The following code will print a message on screen every time a block is broken in the game
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```javascript
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events.on( 'block.BlockBreakEvent', function( evt ) {
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evt.player.sendMessage( evt.player.name + ' broke a block!');
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} );
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```
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To handle an event only once and unregister from further events...
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```javascript
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events.on( 'block.BlockBreakEvent', function( evt ) {
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evt.player.sendMessage( evt.player.name + ' broke a block!');
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this.unregister();
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} );
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The `this` keyword when used inside the callback function refers to
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the Listener object created by ScriptCraft. It has a single method
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`unregister()` which can be used to stop listening. This is the same
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object which is returned by the `events.on()` function.
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To unregister a listener *outside* of the listener function...
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```javascript
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var myBlockBreakListener = events.on( 'block.BlockBreakEvent', function( evt ) { ... } );
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...
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myBlockBreakListener.unregister();
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```
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To listen for events using a full class name as the `eventName` parameter...
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```javascript
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events.on( org.bukkit.event.block.BlockBreakEvent, function( evt ) {
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evt.player.sendMessage( evt.player.name + ' broke a block!');
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} );
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```
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[buk2]: http://wiki.bukkit.org/Event_API_Reference
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[buk]: http://jd.bukkit.org/dev/apidocs/index.html?org/bukkit/event/Event.html
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***/
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var helper = require('events-helper');
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for ( var func in helper ) {
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exports[func] = helper[func];
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};
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var bkEventPriority = org.bukkit.event.EventPriority,
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bkEventExecutor = org.bukkit.plugin.EventExecutor,
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bkRegisteredListener = org.bukkit.plugin.RegisteredListener,
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bkEventPackage = 'org.bukkit.event.';
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exports.on = function(
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/* String or java Class */
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eventType,
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/* function( registeredListener, event) */
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handler,
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/* (optional) String (HIGH, HIGHEST, LOW, LOWEST, NORMAL, MONITOR), */
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priority ) {
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var handlerList,
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listener = {},
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eventExecutor;
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if ( typeof priority == 'undefined' ) {
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priority = bkEventPriority.HIGHEST;
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} else {
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priority = bkEventPriority[priority.toUpperCase()];
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}
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if ( typeof eventType == 'string' ) {
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/*
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Nashorn doesn't support bracket notation for accessing packages.
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E.g. java.net will work but java['net'] won't.
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https://bugs.openjdk.java.net/browse/JDK-8031715
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*/
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if ( typeof Java != 'undefined' ) {
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// nashorn environment
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eventType = Java.type( bkEventPackage + eventType );
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} else {
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eventType = eval( bkEventPackage + eventType );
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}
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}
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handlerList = eventType.getHandlerList( );
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var result = { };
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eventExecutor = new bkEventExecutor( {
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execute: function( l, evt ) {
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handler.call( result, evt );
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}
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} );
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/*
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wph 20130222 issue #64 bad interaction with Essentials plugin
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if another plugin tries to unregister a Listener (not a Plugin or a RegisteredListener)
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then BOOM! the other plugin will throw an error because Rhino can't coerce an
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equals() method from an Interface.
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The workaround is to make the ScriptCraftPlugin java class a Listener.
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Should only unregister() registered plugins in ScriptCraft js code.
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*/
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listener.reg = new bkRegisteredListener( __plugin, eventExecutor, priority, __plugin, true );
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handlerList.register( listener.reg );
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result.unregister = function(){
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handlerList.unregister( listener.reg );
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};
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return result;
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};
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