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

// 
// Micro Windows Implementation 
// gui.cpp 
// 
// $Revision: 1.2 $ 
// $Source: P:/MWINDOWS/LIB/rcs/gui.cpp $ 
// $Date: 1993/11/27 09:53:32 $ 
// 
 
// message loop and system (de)initialization is here.... 
 
#include "gui.h" 
#include "desktop.h" 
#include "list.h" 
#include "message.h" 
#include "lowgdi.h" 
#include "controlr.h" 
#include "mouse.h" 
#include "timer.h" 
#include "idler.h" 
 
Desktop      *desktop = NULL; 
MessageQueue *msgqueue; 
Mouse        *mouse; 
Timer        *timer; 
Idler        *idler; 
List         *controllerList; 
 
Driver::Driver () 
{ 
    if (desktop != NULL) 
    { 
        mainDriver = FALSE; 
        return; 
    } 
 
    mainDriver = TRUE; 
    _lgOpenGraphics ();         // initialized LowGDI 
 
    if (_lgIsMouseActive() == FALSE) 
    { 
        _lgCloseGraphics (); 
        printf ("Micro Windows: mouse driver should be loaded before running me.\n"); 
        abort ();       // it's a function in STDLIB.H 
    } 
 
    controllerList = new List; 
    initControllers (); 
 
    // create global objects 
 
    msgqueue = new MessageQueue; 
    desktop = new Desktop (&Rect (0, 0, _lgGetScreenWidth() - 1, 
                                        _lgGetScreenHeight() - 1)); 
} 
 
Driver::~Driver () 
{ 
    if (mainDriver == FALSE) return; 
 
    deleteControllers (); 
    delete controllerList; 
    delete msgqueue; 
 
    _lgCloseGraphics (); 
} 
 
// ----------------------- 
//  STANDARD MESSAGE LOOP 
// ----------------------- 
 
// Deng's comment: however, in MODAL DIALOGUE BOX (not supported 
// in Micro Windows/Lite) a standalone message box is required. 
 
int Driver::run () 
{ 
    Message *msg; 
 
    while (1) 
    { 
        poolControllers ();         // pool controllers 
 
        // is the queue empty? 
        if ((msg = msgqueue->get()) == NULL) continue; 
 
        // does desktop contain no subview anymore? 
        if (desktop->isEmpty() == TRUE) break; 
 
        // is it a quit message? 
        if (msg->sender == desktop && msg->type == MSG_Quit) break; 
 
        // if not, dispatch it 
        desktop->messageDispatcher (msg); 
 
        // and then destroy the message object 
        delete msg; 
    } 
 
    int returnval = (int)msg->extra; 
    delete msg; 
    return (returnval); 
} 
 
void Driver::poolControllers () 
{ 
    Controller *c; 
 
    if ((c = (Controller*)controllerList->next ()) == NULL) 
        c = (Controller*)controllerList->first(); 
    if (c == NULL) return; 
 
    c->pool (msgqueue); 
} 
 
void Driver::initControllers () 
{ 
    mouse = new Mouse; 
    timer = new Timer; 
    idler = new Idler; 
    controllerList->put (mouse); 
    controllerList->put (timer); 
    controllerList->put (idler); 
} 
 
void Driver::deleteControllers () 
{ 
    Object *o = controllerList->first(); 
 
    do 
    { 
        if (o == NULL) break; 
        delete o; 
        o = controllerList->next(); 
    } while (1); 
}