// Author: David Elliott
// Modified by:
// Created: 2002/11/27
-// RCS-ID: $Id$
// Copyright: (c) David Elliott
// Software 2000 Ltd.
-// Licence: wxWidgets licence
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#include "wx/wxprec.h"
#include "wx/app.h"
#ifndef WX_PRECOMP
- #include "wx/dc.h"
#include "wx/intl.h"
#include "wx/log.h"
#include "wx/module.h"
#include "wx/cocoa/mbarman.h"
#include "wx/cocoa/NSApplication.h"
+#include "wx/cocoa/dc.h"
+
#import <AppKit/NSApplication.h>
#import <Foundation/NSRunLoop.h>
#import <Foundation/NSThread.h>
// application (otherwise applications would need to handle it)
if ( argc > 1 )
{
- static const wxChar *ARG_PSN = _T("-psn_");
+ static const wxChar *ARG_PSN = wxT("-psn_");
if ( wxStrncmp(argv[1], ARG_PSN, wxStrlen(ARG_PSN)) == 0 )
{
// remove this argument
}
}
+ /*
+ Cocoa supports -Key value options which set the user defaults key "Key"
+ to the value "value" Some of them are very handy for debugging like
+ -NSShowAllViews YES. Cocoa picks these up from the real argv so
+ our removal of them from the wx copy of it does not affect Cocoa's
+ ability to see them.
+
+ We basically just assume that any "-NS" option and its following
+ argument needs to be removed from argv. We hope that user code does
+ not expect to see -NS options and indeed it's probably a safe bet
+ since most user code accepting options is probably using the
+ double-dash GNU-style syntax.
+ */
+ for(int i=1; i < argc; ++i)
+ {
+ static const wxChar *ARG_NS = wxT("-NS");
+ static const int ARG_NS_LEN = wxStrlen(ARG_NS);
+ if( wxStrncmp(argv[i], ARG_NS, ARG_NS_LEN) == 0 )
+ {
+ // Only eat this option if it has an argument
+ if( (i + 1) < argc )
+ {
+ argc -= 2;
+ memmove(argv + i, argv + i + 2, argc * sizeof(wxChar*));
+ // drop back one position so the next run through the loop
+ // reprocesses the argument at our current index.
+ --i;
+ }
+ }
+ }
+
return wxAppBase::Initialize(argc, argv);
}
{
wxAutoNSAutoreleasePool pool;
- wxDC::CocoaShutdownTextSystem();
+ wxCocoaDCImpl::CocoaShutdownTextSystem();
wxMenuBarManager::DestroyInstance();
[[NSNotificationCenter defaultCenter] removeObserver:sg_cocoaAppObserver];
{
m_topWindow = NULL;
-#ifdef __WXDEBUG__
- m_isInAssert = false;
-#endif // __WXDEBUG__
-
argc = 0;
+#if !wxUSE_UNICODE
argv = NULL;
+#endif
m_cocoaApp = NULL;
m_cocoaAppDelegate = NULL;
}
if(!sm_isEmbedded)
wxMenuBarManager::CreateInstance();
- wxDC::CocoaInitializeTextSystem();
+ wxCocoaDCImpl::CocoaInitializeTextSystem();
return true;
}
wxAppConsole::Exit();
}
-// Yield to other processes
-bool wxApp::Yield(bool onlyIfNeeded)
-{
- // MT-FIXME
- static bool s_inYield = false;
-
-#if wxUSE_LOG
- // disable log flushing from here because a call to wxYield() shouldn't
- // normally result in message boxes popping up &c
- wxLog::Suspend();
-#endif // wxUSE_LOG
-
- if (s_inYield)
- {
- if ( !onlyIfNeeded )
- {
- wxFAIL_MSG( wxT("wxYield called recursively" ) );
- }
-
- return false;
- }
-
- s_inYield = true;
-
- // Run the event loop until it is out of events
- while(1)
- {
- wxAutoNSAutoreleasePool pool;
- NSEvent *event = [GetNSApplication()
- nextEventMatchingMask:NSAnyEventMask
- untilDate:[NSDate distantPast]
- inMode:NSDefaultRunLoopMode
- dequeue: YES];
- if(!event)
- break;
- [GetNSApplication() sendEvent: event];
- }
-
-#if wxUSE_LOG
- // let the logs be flashed again
- wxLog::Resume();
-#endif // wxUSE_LOG
-
- s_inYield = false;
-
- return true;
-}
-
void wxApp::WakeUpIdle()
{
+ /* When called from the main thread the NSAutoreleasePool managed by
+ the [NSApplication run] method would ordinarily be in place and so
+ one would think a pool here would be unnecessary.
+
+ However, when called from a different thread there is usually no
+ NSAutoreleasePool in place because wxThread has no knowledge of
+ wxCocoa. The pool here is generally only ever going to contain
+ the NSEvent we create with the factory method. As soon as we add
+ it to the main event queue with postEvent:atStart: it is retained
+ and so safe for our pool to release.
+ */
+ wxAutoNSAutoreleasePool pool;
+ /* NOTE: This is a little heavy handed. What this does is cause an
+ AppKit NSEvent to be added to NSApplication's queue (which is always
+ on the main thread). This will cause the main thread runloop to
+ exit which returns control to nextEventMatchingMask which returns
+ the event which is then sent with sendEvent: and essentially dropped
+ since it's not for a window (windowNumber 0) and NSApplication
+ certainly doesn't understand it.
+
+ With the exception of wxEventLoop::Exit which uses us to cause the
+ runloop to exit and return to the NSApplication event loop, most
+ callers only need wx idle to happen, or more specifically only really
+ need to ensure that ProcessPendingEvents is called which is currently
+ done without exiting the runloop.
+
+ Be careful if you decide to change the implementation of this method
+ as wxEventLoop::Exit depends on the current behaviour.
+ */
[m_cocoaApp postEvent:[NSEvent otherEventWithType:NSApplicationDefined
location:NSZeroPoint modifierFlags:NSAnyEventMask
timestamp:0 windowNumber:0 context:nil
static int sg_cApplicationWillUpdate = 0;
#endif
+/*!
+ Invoked from the applicationWillUpdate notification observer. See the
+ NSApplication documentation for the official statement on when this
+ will be called. Since it can be hard to understand for a Cocoa newbie
+ I'll try to explain it here as it relates to wxCocoa.
+
+ Basically, we get called from within nextEventMatchingMask if and only
+ if any user code told the application to send the update notification
+ (sort of like a request for idle events). However, unlike wx idle events,
+ this notification is sent quite often, nearly every time through the loop
+ because nearly every control tells the application to send it.
+
+ Because wx idle events are only supposed to be sent when the event loop
+ is about to block we instead schedule a function to be called just
+ before the run loop waits and send the idle events from there.
+
+ It also has the desirable effect of only sending the wx idle events when
+ the event loop is actually going to block. If the event loop is being
+ pumped manualy (e.g. like a PeekMessage) then the kCFRunLoopBeforeWaiting
+ observer never fires. Our Yield() method depends on this because sending
+ idle events from within Yield would be bad.
+
+ Normally you might think that we could just set the observer up once and
+ leave it attached. However, this is problematic because our run loop
+ observer calls user code (the idle handlers) which can actually display
+ modal dialogs. Displaying a modal dialog causes reentry of the event
+ loop, usually in a different run loop mode than the main loop (e.g. in
+ modal-dialog mode instead of default mode). Because we only register the
+ observer with the run loop mode at the time of this call, it won't be
+ called from a modal loop.
+
+ We want it to be called and thus we need a new observer.
+ */
void wxApp::CocoaDelegate_applicationWillUpdate()
{
wxLogTrace(wxTRACE_COCOA,wxT("applicationWillUpdate"));
CFRunLoopRef cfRunLoop = CFRunLoopGetCurrent();
wxCFRef<CFStringRef> cfRunLoopMode(CFRunLoopCopyCurrentMode(cfRunLoop));
+ /* If we have an observer and that observer is for the wrong run loop
+ mode then invalidate it and release it.
+ */
if(m_cfRunLoopIdleObserver != NULL && m_cfObservedRunLoopMode != cfRunLoopMode)
{
CFRunLoopObserverInvalidate(m_cfRunLoopIdleObserver);
#if 0
++sg_cApplicationWillUpdate;
#endif
+ /* This will be true either on the first call or when the above code has
+ invalidated and released the exisiting observer.
+ */
if(m_cfRunLoopIdleObserver == NULL)
{
// Enable idle event handling
, NULL
, NULL
};
+ /* NOTE: I can't recall why we don't just let the observer repeat
+ instead of invalidating itself each time it fires thus requiring
+ it to be recreated for each shot but there was if I remember
+ some good (but very obscure) reason for it.
+
+ On the other hand, I could be wrong so don't take that as gospel.
+ */
m_cfRunLoopIdleObserver.reset(CFRunLoopObserverCreate(kCFAllocatorDefault, kCFRunLoopBeforeWaiting, /*repeats*/FALSE, /*priority*/0, ObserveMainRunLoopBeforeWaiting, &observerContext));
m_cfObservedRunLoopMode = cfRunLoopMode;
CFRunLoopAddObserver(cfRunLoop, m_cfRunLoopIdleObserver, m_cfObservedRunLoopMode);
#endif
}
+/*!
+ Called by CFRunLoop just before waiting. This is the appropriate time to
+ send idle events. Unlike other ports, we don't peek the queue for events
+ and stop idling if there is one. Instead, if the user requests more idle
+ events we tell Cocoa to send us an applicationWillUpdate notification
+ which will cause our observer of that notification to tell CFRunLoop to
+ call us before waiting which will cause us to be fired again but only
+ after exhausting the event queue.
+
+ The reason we do it this way is that peeking for an event causes CFRunLoop
+ to reenter and fire off its timers, observers, and sources which we're
+ better off avoiding. Doing it this way, we basically let CFRunLoop do the
+ work of peeking for the next event which is much nicer.
+ */
void wxApp::CF_ObserveMainRunLoopBeforeWaiting(CFRunLoopObserverRef observer, int activity)
{
- // Ensure that the app knows we've been invalidated
+ // Ensure that CocoaDelegate_applicationWillUpdate will recreate us.
+ // We've already been invalidated by CFRunLoop because we are one-shot.
m_cfRunLoopIdleObserver.reset();
#if 0
wxLogTrace(wxTRACE_COCOA,wxT("Idle BEGIN (%d)"), sg_cApplicationWillUpdate);
}
}
-#ifdef __WXDEBUG__
-void wxApp::OnAssert(const wxChar *file, int line, const wxChar* cond, const wxChar *msg)
-{
- m_isInAssert = true;
- wxAppBase::OnAssert(file, line, cond, msg);
- m_isInAssert = false;
-}
-#endif // __WXDEBUG__
+/* A note about Cocoa's event loops vs. run loops:
+
+ It's important to understand that Cocoa has a two-level event loop. The
+ outer level is run by NSApplication and can only ever happen on the main
+ thread. The nextEventMatchingMask:untilDate:inMode:dequeue: method returns
+ the next event which is then given to sendEvent: to send it. These
+ methods are defined in NSApplication and are thus part of AppKit.
+
+ Events (NSEvent) are only sent due to actual user actions like clicking
+ the mouse or moving the mouse or pressing a key and so on. There are no
+ paint events; there are no timer events; there are no socket events; there
+ are no idle events.
+
+ All of those types of "events" have nothing to do with the GUI at all.
+ That is why Cocoa's AppKit doesn't implement them. Instead, they are
+ implemented in Foundation's NSRunLoop which on OS X uses CFRunLoop
+ to do the actual work.
+
+ How NSApplication uses NSRunLoop is rather interesting. Basically, it
+ interacts with NSRunLoop only from within the nextEventMatchingMask
+ method. It passes its inMode: argument almost directly to NSRunLoop
+ and thus CFRunLoop. The run loop then runs (e.g. loops) until it
+ is told to exit. The run loop calls the callout functions directly.
+ From within those callout functions the run loop is considered to
+ be running. Presumably, the AppKit installs a run loop source to
+ receive messages from the window server over the mach port (like a
+ socket). For some messages (e.g. need to paint) the AppKit will
+ call application code like drawRect: without exiting the run loop.
+ For other messages (ones that can be encapsulated in an NSEvent)
+ the AppKit tells the run loop to exit which returns control to
+ the nextEventMatchingMask method which then returns the NSEvent
+ object. It's important to note that once the runloop has exited
+ it is no longer considered running and thus if you ask it which
+ mode it is running in it will return nil.
+
+ When manually pumping the event loop care should be taken to
+ tell it to run in the correct mode. For instance, if you are
+ using it to run a modal dialog then you want to run it in
+ the modal panel run loop mode. AppKit presumably has sources
+ or timers or observers that specifically don't listen on this
+ mode. Another interesting mode is the connection reply mode.
+ This allows Cocoa to wait for a response from a distributed
+ objects message without firing off user code that may result
+ in a DO call being made thus recursing. So basically, the
+ mode is a way for Cocoa to attempt to avoid run loop recursion
+ but to allow it under certain circumstances.
+ */
+
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