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package org.eclipse.swt.widgets;
/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved
*/
import org.eclipse.swt.internal.EventListenerCompatability;
/**
* Instances of this class implement a simple
* look up mechanism that maps an event type
* to a listener. Muliple listeners for the
* same event type are supported.
*/
class EventTable {
int [] types;
Listener [] handlers;
public void hook (int eventType, Listener handler) {
if (types == null) types = new int [4];
if (handlers == null) handlers = new Listener [4];
for (int i=0; i<types.length; i++) {
if (types [i] == 0) {
types [i] = eventType;
handlers [i] = handler;
return;
}
}
int size = types.length;
int [] newTypes = new int [size + 4];
Listener [] newHandlers = new Listener [size + 4];
System.arraycopy (types, 0, newTypes, 0, size);
System.arraycopy (handlers, 0, newHandlers, 0, size);
types = newTypes; handlers = newHandlers;
types [size] = eventType; handlers [size] = handler;
}
public boolean hooks (int eventType) {
if (handlers == null) return false;
for (int i=0; i<types.length; i++) {
if (types [i] == eventType) return true;
}
return false;
}
public void sendEvent (Event event) {
if (handlers == null) return;
for (int i=0; i<types.length; i++) {
if (types [i] == event.type) {
Listener listener = handlers [i];
if (listener != null) listener.handleEvent (event);
}
}
}
public void unhook (int eventType, Listener handler) {
if (handlers == null) return;
for (int i=0; i<types.length; i++) {
if ((types [i] == eventType) && (handlers [i] == handler)) {
types [i] = 0;
handlers [i] = null;
return;
}
}
}
public void unhook (int eventType, EventListenerCompatability handler) {
if (handlers == null) return;
for (int i=0; i<types.length; i++) {
if (types [i] == eventType) {
if (handlers [i] instanceof TypedListener) {
TypedListener listener = (TypedListener) handlers [i];
if (listener.getEventListener () == handler) {
types [i] = 0;
handlers [i] = null;
return;
}
}
}
}
}
}
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