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/*
Copyright (C) 2000 by Jorrit Tyberghein
Written by Michael Dale Long.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "cssysdef.h"
#include "csutil/scf.h"
#include "csutil/csevcord.h"
#include "iutil/eventh.h"
SCF_IMPLEMENT_IBASE(csEventCord)
SCF_IMPLEMENTS_INTERFACE(iEventCord)
SCF_IMPLEMENT_IBASE_END
csEventCord::csEventCord(int cat, int subcat) :
category(cat), subcategory(subcat)
{
plugins = NULL;
// By default, only pass along category 0, subcategory 0 events to the queue.
pass = (category == 0 && subcategory == 0);
SpinLock = 0;
}
int csEventCord::Insert(iEventHandler *plugin, int priority)
{
Lock ();
// Increment the plugin reference count
plugin->IncRef ();
int retval = 0;
if (plugins)
{
// Add a new record
PluginData *last = NULL, *curr = plugins;
while (curr)
{
if (priority > curr->priority)
break;
last = curr;
curr = curr->next;
retval++;
}
if (last)
{
// Insert in the middle or at the end
last->next = new PluginData;
last->next->plugin = plugin;
last->next->priority = priority;
last->next->next = curr;
}
else
{
// Insert at the top
plugins = new PluginData;
plugins->plugin = plugin;
plugins->priority = priority;
plugins->next = curr;
}
}
else
{
// Create first record
plugins = new PluginData;
plugins->plugin = plugin;
plugins->priority = priority;
plugins->next = NULL;
}
Unlock ();
return retval;
}
void csEventCord::Remove (iEventHandler *plugin)
{
Lock ();
PluginData *last = NULL, *curr = plugins;
// Walk the list until you find the plugin
while (curr)
{
if (curr->plugin == plugin)
if (last)
{
// Unlink the plugin from the list and delete it's record
last->next = curr->next;
curr->plugin->DecRef ();
delete curr;
break;
}
last = curr;
curr = curr->next;
}
Unlock ();
}
bool csEventCord::Post (iEvent *event)
{
Lock ();
PluginData *cur = plugins;
// Walk the list until a plugin returns true
while (cur)
{
if (cur->plugin->HandleEvent (*event))
{
Unlock ();
return true;
}
cur = cur->next;
}
Unlock ();
// If we pass events along to the queue, then we return
// false so it will process the event.
return !pass;
}
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