在更高层次上,我将创建一个具有确切的参数/名称(甚至可能是自我和_cmd)的C++基类。在某处,您需要创建这些内容,并建立从管理器到所查询对象的连接。
objc对象可以持有指向其C++实现/接收器的指针,也可以使用索引,或者可以使用self和散列/映射方法。
因此,管理员可以保存事件接收器的集合,然后UIView将实现该方法,该方法会将消息转发给管理器来解析命令(您如何处理命令/事件?) 。或者,如果你想要的只是实现,那么只需使用ObjectiveC++并将事件接收器/处理器作为ivar添加到UIResponder。
增加:为'然后只是使用ObjectiveC++并添加事件接收器/处理器作为ivar到UIResponder'添加了一个快速的伪代码说明。
// Mr.Gando:
// To answer your question about what do I need to do with events,
// for example I need to subscribe a button to the manager, so when
// it get's touched, a method "Fire" is called... just an example,
// but I think your answer is good. Does this Manager have to be
// thread safe ?
/////////////////////////////////////////////////////////////////////
/* not declared in event_manager_t's scope, so that objc only files may declare members without error - if all your code is objc++, then relocate */
class mon_event_manager_event_handler_t {
/* ... */
void touchesBegan(id sender, NSSet * touches, UIEvent * event) {
assert(sender && touches && event);
assert(this->getResponder() && this->getResponder() == sender);
if (this->getResponder() && this->getResponder() == sender && this->isSubscribed() && this->isInterestedInTouchesBeganEvents()) {
SharedEventManager().touchesBegan(this, sender, touches, event);
}
}
private:
UIResponder * responder_;
UInt32 flags_EventsOrActionsOfInterest_;
bool isSubscribed_;
};
/** implement as singleton */
class event_manager_t {
/* ... */
void touchesBegan(handler_t* const handler, id sender, NSSet * touches, UIEvent * event) {
this->fire();
}
void fire() {
NSLog(@"Fire()");
/* you can message anything here, just realize that events may not occur on the recipient's work thread */
}
static mon_event_manager_event_handler_t* CreateNextHandler(UIResponder * responder) {
/* SharedEventManager() must guard its data here */
mon_event_manager_event_handler_t* result(SharedEventManager().createOrReuseHandler());
result->setResponder(responder);
SharedEventManager().registerNewHandler(handler);
return result;
}
static void RemoveHandler(mon_event_manager_event_handler_t* handler) {
/* SharedEventManager() must guard its data here */
SharedEventManager().removeHandler(handler);
}
};
/** @return the event_manager_t singleton object */
event_manager_t& SharedEventManager();
/////////////////////////////////////////////////////////////////////
struct mon_event_manager_event_handler_t;
@interface MonResponder
{
mon_event_manager_event_handler_t* handler_;
}
@end
/////////////////////////////////////////////////////////////////////
@implementation MonResponder
/* ... */
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
assert(handler_ && "TODO: create the handler");
handler_->touchesBegan(self, touches, event);
/* ... */
}
@end
/////////////////////////////////////////////////////////////////////
对于多级设计,给定的规范有点模糊,不是吗? – justin 2009-12-03 06:23:27