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events.js
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2000-06-01
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is JSIRC Library
*
* The Initial Developer of the Original Code is New Dimensions Consulting,
* Inc. Portions created by New Dimensions Consulting, Inc. are
* Copyright (C) 1999 New Dimenstions Consulting, Inc. All
* Rights Reserved.
*
* Contributor(s):
*
*
* Contributor(s):
* Robert Ginda, rginda@ndcico.com, original author
*
* depends on utils.js
*
* Event and EventPump classes. The EventPump maintains a queue of event
* objects. To inject an event into this queue, use |EventPump.addEvent|.
* |EventQueue.routeEvents| steps at most |EventPump.eventsPerStep|
* events, and then returns control.
*
* 1999-08-15 rginda@ndcico.com v1.0
*
*/
/*
* event class
*/
function CEvent (set, type, destObject, destMethod)
{
this.set = set;
this.type = type;
this.destObject = destObject;
this.destMethod = destMethod;
this.hooks = new Array();
}
/*
* event pump
*/
function CEventPump (eventsPerStep)
{
/* event routing stops after this many levels, safety valve */
this.MAX_EVENT_DEPTH = 50;
this.eventsPerStep = eventsPerStep;
this.queue = new Array();
this.hooks = new Array();
}
CEventPump.prototype.onHook =
function ep_hook(e, hooks)
{
var h;
if (typeof hooks == "undefined")
hooks = this.hooks;
hook_loop:
for (h = hooks.length - 1; h >= 0; h--)
{
if (!hooks[h].enabled ||
!matchObject (e, hooks[h].pattern, hooks[h].neg))
continue hook_loop;
e.hooks.push (hooks[h]);
var rv = hooks[h].f(e);
if ((typeof rv == "boolean") &&
(rv == false))
{
dd ("hook #" + h + " '" +
((typeof hooks[h].name != "undefined") ? hooks[h].name :
"") + "' stopped hook processing.");
return true;
}
}
}
CEventPump.prototype.addHook =
function ep_addhook(pattern, f, name, neg, enabled, hooks)
{
if (typeof hooks == "undefined")
hooks = this.hooks;
if (typeof f != "function")
return false;
if (typeof enabled == "undefined")
enabled = true;
else
enabled = Boolean(enabled);
neg = Boolean(neg);
return (hooks.push({pattern: pattern, f: f, name: name,
neg: neg, enabled: enabled}) - 1);
}
CEventPump.prototype.getHook =
function ep_gethook(name, hooks)
{
if (typeof hooks == "undefined")
hooks = this.hooks;
for (var h in hooks)
if (hooks[h].name.toLowerCase() == name.toLowerCase())
return hooks[h];
return null;
}
CEventPump.prototype.removeHookByName =
function ep_remhookname(name, hooks)
{
if (typeof hooks == "undefined")
hooks = this.hooks;
for (var h in hooks)
if (hooks[h].name.toLowerCase() == name.toLowerCase())
{
arrayRemoveAt (hooks, h);
return true;
}
return false;
}
CEventPump.prototype.removeHookByIndex =
function ep_remhooki(idx, hooks)
{
if (typeof hooks == "undefined")
hooks = this.hooks;
return arrayRemoveAt (hooks, idx);
}
CEventPump.prototype.addEvent =
function ep_addevent (e)
{
e.queuedAt = new Date();
arrayInsertAt(this.queue, 0, e);
return true;
}
CEventPump.prototype.routeEvent =
function ep_routeevent (e)
{
var count = 0;
this.currentEvent = e;
e.level = 0;
while (e.destObject)
{
e.level++;
this.onHook (e);
var destObject = e.destObject;
e.destObject = (void 0);
switch (typeof destObject[e.destMethod])
{
case "function":
if (1)
try
{
destObject[e.destMethod] (e);
}
catch (ex)
{
dd ("Error routing event: " + ex + " in " +
e.destMethod);
}
else
destObject[e.destMethod] (e);
if (count++ > this.MAX_EVENT_DEPTH)
throw "Too many events in chain";
break;
case "undefined":
//dd ("** " + e.destMethod + " does not exist.");
break;
default:
dd ("** " + e.destMethod + " is not a function.");
}
if ((e.type != "event-end") && (!e.destObject))
{
e.lastSet = e.set;
e.set = "eventpump";
e.lastType = e.type;
e.type = "event-end";
e.destMethod = "onEventEnd";
e.destObject = this;
}
}
delete this.currentEvent;
return true;
}
CEventPump.prototype.stepEvents =
function ep_stepevents()
{
var i = 0;
while (i < this.eventsPerStep)
{
var e = this.queue.pop();
if (!e || e.type == "yield")
break;
this.routeEvent (e);
i++;
}
return true;
}