www.pudn.com > MicroWindows-Source-200606.zip > message.cpp

// 
// Micro Windows Implementation 
// message.cpp 
// 
// $Revision: 1.2 $ 
// $Source: P:/MWINDOWS/LIB/rcs/message.cpp $ 
// $Date: 1993/11/27 09:53:32 $ 
// 
 
#include "message.h" 
 
BOOL MessageQueue::put (Message *msg) 
{ 
	Message *nmsg = new Message (*msg); 
    return (queue.put (nmsg)); 
} 
 
BOOL MessageQueue::put (View *s, View *r, Controller *c, 
                        MsgType t, Point *p, Rect *a, MsgData e) 
{ 
    return (queue.put (new Message (s, r, c, t, p, a, e))); 
} 
 
Message *MessageQueue::get () 
{ 
    return ((Message*)queue.get()); 
} 
 
BOOL MessageQueue::isEmpty () 
{ 
    return (queue.isEmpty()); 
} 
 
// 
// this function removes all messages in the message queue that 
// matches: 
//      (1) it was sent by Controller *c and, 
//      (2) it would be received by View *r. 
// 
// normally this is used in some controllers that supports 
// "remove" method. Normally "remove" is called after a view 
// is killed/destructed. Thus the controller must clean up 
// ALL existing messages that is going to be sent to the 
// no longer existed view. 
// 
 
void MessageQueue::removeBy (Controller *c, View *r) 
{ 
    Queue another; 
 
    while (1) 
    { 
        Message *msg; 
        if ((msg = (Message*)queue.get()) == NULL) break; 
 
        if (msg->controller == c && msg->receiver == r) 
        { 
            delete msg; 
        } 
        else 
        { 
            another.put (msg); 
        } 
    } 
 
    while (1) 
    { 
        Object *obj; 
        if ((obj = another.get()) == NULL) break; 
        queue.put (obj); 
    } 
}