src/cocoa/evtloop.mm

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        cocoa/evtloop.mm
   3 // Purpose:     implements wxEventLoop for Cocoa
   4 // Author:      David Elliott
   5 // Modified by:
   6 // Created:     2003/10/02
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003 David Elliott <dfe@cox.net>
   9 // License:     wxWidgets licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #include "wx/wxprec.h"
  13 #ifndef WX_PRECOMP
  14     #include "wx/log.h"
  15     #include "wx/app.h"
  16 #endif //WX_PRECOMP
  17
  18 #include "wx/evtloop.h"
  19
  20 #import <AppKit/NSApplication.h>
  21 #import <AppKit/NSEvent.h>
  22 #import <Foundation/NSRunLoop.h>
  23
  24 // ========================================================================
  25 // wxEventLoopImpl
  26 // ========================================================================
  27
  28 class WXDLLEXPORT wxEventLoopImpl
  29 {
  30 public:
  31     // ctor
  32     wxEventLoopImpl() { SetExitCode(0); }
  33
  34     // set/get the exit code
  35     void SetExitCode(int exitcode) { m_exitcode = exitcode; }
  36     int GetExitCode() const { return m_exitcode; }
  37
  38 private:
  39     // the exit code of the event loop
  40     int m_exitcode;
  41 };
  42
  43 // ========================================================================
  44 // wxEventLoop
  45 // ========================================================================
  46
  47 // ----------------------------------------------------------------------------
  48 // wxEventLoop running and exiting
  49 // ----------------------------------------------------------------------------
  50
  51 wxEventLoop::~wxEventLoop()
  52 {
  53     wxASSERT_MSG( !m_impl, _T("should have been deleted in Run()") );
  54 }
  55
  56 int wxEventLoop::Run()
  57 {
  58     // event loops are not recursive, you need to create another loop!
  59     wxCHECK_MSG( !IsRunning(), -1, _T("can't reenter a message loop") );
  60
  61     wxEventLoopActivator activate(this);
  62
  63     m_impl = new wxEventLoopImpl;
  64
  65     [[NSApplication sharedApplication] run];
  66
  67     OnExit();
  68
  69     int exitcode = m_impl->GetExitCode();
  70     delete m_impl;
  71     m_impl = NULL;
  72
  73     return exitcode;
  74 }
  75
  76 void wxEventLoop::Exit(int rc)
  77 {
  78     wxCHECK_RET( IsRunning(), _T("can't call Exit() if not running") );
  79
  80     m_impl->SetExitCode(rc);
  81
  82     NSApplication *cocoaApp = [NSApplication sharedApplication];
  83     wxLogTrace(wxTRACE_COCOA,wxT("wxEventLoop::Exit isRunning=%d"), (int)[cocoaApp isRunning]);
  84     wxTheApp->WakeUpIdle();
  85     /* Notes:
  86     If we're being called from idle time (which occurs while checking the
  87     queue for new events) there may or may not be any events in the queue.
  88     In order to successfully stop the event loop, at least one event must
  89     be processed.  To ensure this always happens, WakeUpIdle is called.
  90
  91     If the application was active when closed then this is unnecessary
  92     because it would receive a deactivate event anyway.  However, if the
  93     application was not active when closed, then no events would be
  94     added to the queue by Cocoa and thus the application would wait
  95     indefinitely for the next event.
  96     */
  97     [cocoaApp stop: cocoaApp];
  98 }
  99
 100 // ----------------------------------------------------------------------------
 101 // wxEventLoop message processing dispatching
 102 // ----------------------------------------------------------------------------
 103
 104 bool wxEventLoop::Pending() const
 105 {
 106     // a pointer to the event is returned if there is one, or nil if not
 107     return [[NSApplication sharedApplication]
 108             nextEventMatchingMask: NSAnyEventMask
 109             untilDate: nil /* Equivalent to [NSDate distantPast] */
 110             inMode: NSDefaultRunLoopMode
 111             dequeue: NO];
 112 }
 113
 114 bool wxEventLoop::Dispatch()
 115 {
 116     // This check is required by wxGTK but probably not really for wxCocoa
 117     // Keep it here to encourage developers to write cross-platform code
 118     wxCHECK_MSG( IsRunning(), false, _T("can't call Dispatch() if not running") );
 119     NSApplication *cocoaApp = [NSApplication sharedApplication];
 120     // Block to retrieve an event then send it
 121     if(NSEvent *event = [cocoaApp
 122                 nextEventMatchingMask:NSAnyEventMask
 123                 untilDate:[NSDate distantFuture]
 124                 inMode:NSDefaultRunLoopMode
 125                 dequeue: YES])
 126     {
 127         [cocoaApp sendEvent: event];
 128         return true;
 129     }
 130     return false;
 131 }
 132