Duncan McIntyre / SimpleGUI

Foundation classes for a basic GUI implementing simple widgets and events

Dependents:   TouchScreenGUIDemo

Events/EventDispatcher.cpp@0:0a590815d51c, 2016-03-25 (annotated)

Committer:
duncanFrance
Date:
Fri Mar 25 13:47:04 2016 +0000
Revision:
0:0a590815d51c
Child:
12:63db16fea709
Added EventSource interface

Who changed what in which revision?

UserRevisionLine numberNew contents of line
duncanFrance 0:0a590815d51c 1 #include "EventDispatcher.h"
duncanFrance 0:0a590815d51c 2
duncanFrance 0:0a590815d51c 3 EventDispatcher::EventDispatcher() {
duncanFrance 0:0a590815d51c 4 }
duncanFrance 0:0a590815d51c 5
duncanFrance 0:0a590815d51c 6
duncanFrance 0:0a590815d51c 7
duncanFrance 0:0a590815d51c 8 void EventDispatcher::attachListener(EventListener* l) {
duncanFrance 0:0a590815d51c 9 if(_listeners == NULL) {
duncanFrance 0:0a590815d51c 10 _listeners = new EventListenerWrapper(l);
duncanFrance 0:0a590815d51c 11 } else {
duncanFrance 0:0a590815d51c 12 EventListenerWrapper* w = new EventListenerWrapper(l);
duncanFrance 0:0a590815d51c 13 EventListenerWrapper* p = _listeners;
duncanFrance 0:0a590815d51c 14 while(p->next != NULL) {
duncanFrance 0:0a590815d51c 15 p = p->next;
duncanFrance 0:0a590815d51c 16 }
duncanFrance 0:0a590815d51c 17 p->next = w;
duncanFrance 0:0a590815d51c 18 w->prev = p;
duncanFrance 0:0a590815d51c 19 }
duncanFrance 0:0a590815d51c 20 }
duncanFrance 0:0a590815d51c 21
duncanFrance 0:0a590815d51c 22 void EventDispatcher::detachListener(EventListener* l) {
duncanFrance 0:0a590815d51c 23
duncanFrance 0:0a590815d51c 24 EventListenerWrapper *p = _listeners;
duncanFrance 0:0a590815d51c 25
duncanFrance 0:0a590815d51c 26 if(p == NULL) {
duncanFrance 0:0a590815d51c 27 return;
duncanFrance 0:0a590815d51c 28 }
duncanFrance 0:0a590815d51c 29
duncanFrance 0:0a590815d51c 30 while(p->listener != l) {
duncanFrance 0:0a590815d51c 31 if(p->next == NULL) {
duncanFrance 0:0a590815d51c 32 return;
duncanFrance 0:0a590815d51c 33 }
duncanFrance 0:0a590815d51c 34 p = p->next;
duncanFrance 0:0a590815d51c 35 }
duncanFrance 0:0a590815d51c 36
duncanFrance 0:0a590815d51c 37 // Found the listener
duncanFrance 0:0a590815d51c 38 // Is there only one in the list?
duncanFrance 0:0a590815d51c 39 if(p->prev == NULL && p->next == NULL) {
duncanFrance 0:0a590815d51c 40 _listeners = NULL;
duncanFrance 0:0a590815d51c 41 } else if(p->prev == NULL) {
duncanFrance 0:0a590815d51c 42 // First in the list. Move everything down
duncanFrance 0:0a590815d51c 43 _listeners = p->next;
duncanFrance 0:0a590815d51c 44 _listeners->prev = NULL;
duncanFrance 0:0a590815d51c 45 } else if(p->next == NULL) {
duncanFrance 0:0a590815d51c 46 p->prev->next = NULL;
duncanFrance 0:0a590815d51c 47 } else {
duncanFrance 0:0a590815d51c 48 // Middle of the list
duncanFrance 0:0a590815d51c 49 p->prev->next = p->next;
duncanFrance 0:0a590815d51c 50 p->next->prev = p->prev;
duncanFrance 0:0a590815d51c 51 }
duncanFrance 0:0a590815d51c 52
duncanFrance 0:0a590815d51c 53 delete p;
duncanFrance 0:0a590815d51c 54 }
duncanFrance 0:0a590815d51c 55
duncanFrance 0:0a590815d51c 56 void EventDispatcher::dispatchEvent(Event e) {
duncanFrance 0:0a590815d51c 57 EventListenerWrapper* p = _listeners;
duncanFrance 0:0a590815d51c 58 while(p != NULL) {
duncanFrance 0:0a590815d51c 59 if(p->listener->isEventTarget(e)) {
duncanFrance 0:0a590815d51c 60 p->listener->handleEvent(e);
duncanFrance 0:0a590815d51c 61 }
duncanFrance 0:0a590815d51c 62
duncanFrance 0:0a590815d51c 63 p = p->next;
duncanFrance 0:0a590815d51c 64 }
duncanFrance 0:0a590815d51c 65 }