// Name: src/gtk/evtloop.cpp
// Purpose: implements wxEventLoop for GTK+
// Author: Vadim Zeitlin
-// Modified by:
// Created: 10.07.01
-// RCS-ID: $Id$
// Copyright: (c) 2001 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
-// License: wxWindows licence
+// (c) 2013 Rob Bresalier, Vadim Zeitlin
+// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
// ============================================================================
#endif
#include "wx/evtloop.h"
+#include "wx/evtloopsrc.h"
#ifndef WX_PRECOMP
#include "wx/app.h"
+ #include "wx/log.h"
#endif // WX_PRECOMP
+#include "wx/private/eventloopsourcesmanager.h"
+#include "wx/apptrait.h"
+
#include <gtk/gtk.h>
+#include <glib.h>
+
+// ============================================================================
+// wxEventLoop implementation
+// ============================================================================
+
+extern GtkWidget *wxGetRootWindow();
// ----------------------------------------------------------------------------
-// wxEventLoopImpl
+// wxEventLoop running and exiting
// ----------------------------------------------------------------------------
-class WXDLLEXPORT wxEventLoopImpl
+wxGUIEventLoop::wxGUIEventLoop()
{
-public:
- // ctor
- wxEventLoopImpl() { SetExitCode(0); }
+ m_exitcode = 0;
+}
- // set/get the exit code
- void SetExitCode(int exitcode) { m_exitcode = exitcode; }
- int GetExitCode() const { return m_exitcode; }
+int wxGUIEventLoop::DoRun()
+{
+ guint loopLevel = gtk_main_level();
-private:
- // the exit code of the event loop
- int m_exitcode;
-};
+ // This is placed inside of a loop to take into account nested
+ // event loops. For example, inside this event loop, we may receive
+ // Exit() for a different event loop (which we are currently inside of)
+ // That Exit() will cause this gtk_main() to exit so we need to re-enter it.
+ while ( !m_shouldExit )
+ {
+ gtk_main();
+ }
-// ============================================================================
-// wxEventLoop implementation
-// ============================================================================
+ // Force the enclosing event loop to also exit to see if it is done in case
+ // that event loop had Exit() called inside of the just ended loop. If it
+ // is not time yet for that event loop to exit, it will be executed again
+ // due to the while() loop on m_shouldExit().
+ //
+ // This is unnecessary if we are the top level loop, i.e. loop of level 0.
+ if ( loopLevel )
+ {
+ gtk_main_quit();
+ }
+
+ OnExit();
+
+ return m_exitcode;
+}
+
+void wxGUIEventLoop::ScheduleExit(int rc)
+{
+ wxCHECK_RET( IsInsideRun(), wxT("can't call ScheduleExit() if not started") );
+
+ m_exitcode = rc;
+
+ m_shouldExit = true;
+
+ gtk_main_quit();
+}
+
+void wxGUIEventLoop::WakeUp()
+{
+ // TODO: idle events handling should really be done by wxEventLoop itself
+ // but for now it's completely in gtk/app.cpp so just call there when
+ // we have wxTheApp and hope that it doesn't matter that we do
+ // nothing when we don't...
+ if ( wxTheApp )
+ wxTheApp->WakeUpIdle();
+}
// ----------------------------------------------------------------------------
-// wxEventLoop running and exiting
+// wxEventLoop adding & removing sources
// ----------------------------------------------------------------------------
-wxEventLoop::~wxEventLoop()
+#if wxUSE_EVENTLOOP_SOURCE
+
+extern "C"
+{
+static gboolean wx_on_channel_event(GIOChannel *channel,
+ GIOCondition condition,
+ gpointer data)
{
- wxASSERT_MSG( !m_impl, _T("should have been deleted in Run()") );
+ wxUnusedVar(channel); // Unused if !wxUSE_LOG || !wxDEBUG_LEVEL
+
+ wxLogTrace(wxTRACE_EVT_SOURCE,
+ "wx_on_channel_event, fd=%d, condition=%08x",
+ g_io_channel_unix_get_fd(channel), condition);
+
+ wxEventLoopSourceHandler * const
+ handler = static_cast<wxEventLoopSourceHandler *>(data);
+
+ if ( (condition & G_IO_IN) || (condition & G_IO_PRI) || (condition & G_IO_HUP) )
+ handler->OnReadWaiting();
+
+ if (condition & G_IO_OUT)
+ handler->OnWriteWaiting();
+
+ if ( (condition & G_IO_ERR) || (condition & G_IO_NVAL) )
+ handler->OnExceptionWaiting();
+
+ // we never want to remove source here, so always return true
+ //
+ // The source may have been removed by the handler, so it may be
+ // a good idea to return FALSE when the source has already been
+ // removed. However, that would involve somehow informing this function
+ // that the source was removed, which is not trivial to implement
+ // and handle all cases. It has been found through testing
+ // that if the source was removed by the handler, that even if we
+ // return TRUE here, the source/callback will not get called again.
+ return TRUE;
+}
}
-int wxEventLoop::Run()
+class wxGUIEventLoopSourcesManager : public wxEventLoopSourcesManagerBase
{
- // event loops are not recursive, you need to create another loop!
- wxCHECK_MSG( !IsRunning(), -1, _T("can't reenter a message loop") );
+public:
+ virtual wxEventLoopSource*
+ AddSourceForFD(int fd, wxEventLoopSourceHandler *handler, int flags)
+ {
+ wxCHECK_MSG( fd != -1, NULL, "can't monitor invalid fd" );
- wxEventLoopActivator activate(this);
+ int condition = 0;
+ if ( flags & wxEVENT_SOURCE_INPUT )
+ condition |= G_IO_IN | G_IO_PRI | G_IO_HUP;
+ if ( flags & wxEVENT_SOURCE_OUTPUT )
+ condition |= G_IO_OUT;
+ if ( flags & wxEVENT_SOURCE_EXCEPTION )
+ condition |= G_IO_ERR | G_IO_NVAL;
- m_impl = new wxEventLoopImpl;
+ GIOChannel* channel = g_io_channel_unix_new(fd);
+ const unsigned sourceId = g_io_add_watch
+ (
+ channel,
+ (GIOCondition)condition,
+ &wx_on_channel_event,
+ handler
+ );
+ // it was ref'd by g_io_add_watch() so we can unref it here
+ g_io_channel_unref(channel);
- gtk_main();
+ if ( !sourceId )
+ return NULL;
- OnExit();
+ wxLogTrace(wxTRACE_EVT_SOURCE,
+ "Adding event loop source for fd=%d with GTK id=%u",
+ fd, sourceId);
- int exitcode = m_impl->GetExitCode();
- delete m_impl;
- m_impl = NULL;
- return exitcode;
-}
+ return new wxGTKEventLoopSource(sourceId, handler, flags);
+ }
+};
-void wxEventLoop::Exit(int rc)
+wxEventLoopSourcesManagerBase* wxGUIAppTraits::GetEventLoopSourcesManager()
{
- wxCHECK_RET( IsRunning(), _T("can't call Exit() if not running") );
+ static wxGUIEventLoopSourcesManager s_eventLoopSourcesManager;
+
+ return &s_eventLoopSourcesManager;
+}
- m_impl->SetExitCode(rc);
+wxGTKEventLoopSource::~wxGTKEventLoopSource()
+{
+ wxLogTrace(wxTRACE_EVT_SOURCE,
+ "Removing event loop source with GTK id=%u", m_sourceId);
- gtk_main_quit();
+ g_source_remove(m_sourceId);
}
+#endif // wxUSE_EVENTLOOP_SOURCE
+
// ----------------------------------------------------------------------------
// wxEventLoop message processing dispatching
// ----------------------------------------------------------------------------
-bool wxEventLoop::Pending() const
+bool wxGUIEventLoop::Pending() const
{
- if (wxTheApp)
+ if ( wxTheApp )
{
- // We need to remove idle callbacks or gtk_events_pending will
- // never return false.
- wxTheApp->RemoveIdleSource();
+ // this avoids false positives from our idle source
+ return wxTheApp->EventsPending();
}
- return gtk_events_pending();
+ return gtk_events_pending() != 0;
}
-bool wxEventLoop::Dispatch()
+bool wxGUIEventLoop::Dispatch()
{
- wxCHECK_MSG( IsRunning(), false, _T("can't call Dispatch() if not running") );
+ wxCHECK_MSG( IsRunning(), false, wxT("can't call Dispatch() if not running") );
+
+ // gtk_main_iteration() returns TRUE only if gtk_main_quit() was called
+ return !gtk_main_iteration();
+}
+
+extern "C" {
+static gboolean wx_event_loop_timeout(void* data)
+{
+ bool* expired = static_cast<bool*>(data);
+ *expired = true;
+
+ // return FALSE to remove this timeout
+ return FALSE;
+}
+}
+
+int wxGUIEventLoop::DispatchTimeout(unsigned long timeout)
+{
+ bool expired = false;
+ const unsigned id = g_timeout_add(timeout, wx_event_loop_timeout, &expired);
+ bool quit = gtk_main_iteration() != 0;
+
+ if ( expired )
+ return -1;
+
+ g_source_remove(id);
+
+ return !quit;
+}
+
+//-----------------------------------------------------------------------------
+// YieldFor
+//-----------------------------------------------------------------------------
+
+extern "C" {
+static void wxgtk_main_do_event(GdkEvent* event, void* data)
+{
+ // categorize the GDK event according to wxEventCategory.
+ // See http://library.gnome.org/devel/gdk/unstable/gdk-Events.html#GdkEventType
+ // for more info.
+
+ // NOTE: GDK_* constants which were not present in the GDK2.0 can be tested for
+ // only at compile-time; when running the program (compiled with a recent GDK)
+ // on a system with an older GDK lib we can be sure there won't be problems
+ // because event->type will never assume those values corresponding to
+ // new event types (since new event types are always added in GDK with non
+ // conflicting values for ABI compatibility).
+
+ // Some events (currently only a single one) may be used for more than one
+ // category, so we need 2 variables. The second one will remain "unknown"
+ // in most cases.
+ wxEventCategory cat = wxEVT_CATEGORY_UNKNOWN,
+ cat2 = wxEVT_CATEGORY_UNKNOWN;
+ switch (event->type)
+ {
+ case GDK_SELECTION_REQUEST:
+ case GDK_SELECTION_NOTIFY:
+ case GDK_SELECTION_CLEAR:
+ case GDK_OWNER_CHANGE:
+ cat = wxEVT_CATEGORY_CLIPBOARD;
+ break;
+
+ case GDK_KEY_PRESS:
+ case GDK_KEY_RELEASE:
+ case GDK_BUTTON_PRESS:
+ case GDK_2BUTTON_PRESS:
+ case GDK_3BUTTON_PRESS:
+ case GDK_BUTTON_RELEASE:
+ case GDK_SCROLL: // generated from mouse buttons
+ case GDK_CLIENT_EVENT:
+ cat = wxEVT_CATEGORY_USER_INPUT;
+ break;
+
+ case GDK_PROPERTY_NOTIFY:
+ // This one is special: it can be used for UI purposes but also for
+ // clipboard operations, so allow it in both cases (we probably could
+ // examine the event itself to distinguish between the two cases but
+ // this would be unnecessarily complicated).
+ cat2 = wxEVT_CATEGORY_CLIPBOARD;
+ // Fall through.
+
+ case GDK_PROXIMITY_IN:
+ case GDK_PROXIMITY_OUT:
+
+ case GDK_MOTION_NOTIFY:
+ case GDK_ENTER_NOTIFY:
+ case GDK_LEAVE_NOTIFY:
+ case GDK_VISIBILITY_NOTIFY:
+
+ case GDK_FOCUS_CHANGE:
+ case GDK_CONFIGURE:
+ case GDK_WINDOW_STATE:
+ case GDK_SETTING:
+ case GDK_DELETE:
+ case GDK_DESTROY:
+
+ case GDK_EXPOSE:
+#ifndef __WXGTK3__
+ case GDK_NO_EXPOSE:
+#endif
+ case GDK_MAP:
+ case GDK_UNMAP:
+
+ case GDK_DRAG_ENTER:
+ case GDK_DRAG_LEAVE:
+ case GDK_DRAG_MOTION:
+ case GDK_DRAG_STATUS:
+ case GDK_DROP_START:
+ case GDK_DROP_FINISHED:
+#if GTK_CHECK_VERSION(2,8,0)
+ case GDK_GRAB_BROKEN:
+#endif
+#if GTK_CHECK_VERSION(2,14,0)
+ case GDK_DAMAGE:
+#endif
+ cat = wxEVT_CATEGORY_UI;
+ break;
+
+ default:
+ cat = wxEVT_CATEGORY_UNKNOWN;
+ break;
+ }
+
+ wxGUIEventLoop* evtloop = static_cast<wxGUIEventLoop*>(data);
+
+ // is this event allowed now?
+ if (evtloop->IsEventAllowedInsideYield(cat) ||
+ (cat2 != wxEVT_CATEGORY_UNKNOWN &&
+ evtloop->IsEventAllowedInsideYield(cat2)))
+ {
+ // process it now
+ gtk_main_do_event(event);
+ }
+ else if (event->type != GDK_NOTHING)
+ {
+ // process it later (but make a copy; the caller will free the event
+ // pointer)
+ evtloop->StoreGdkEventForLaterProcessing(gdk_event_copy(event));
+ }
+}
+}
+
+bool wxGUIEventLoop::YieldFor(long eventsToProcess)
+{
+#if wxUSE_THREADS
+ if ( !wxThread::IsMain() )
+ {
+ // can't call gtk_main_iteration() from other threads like this
+ return true;
+ }
+#endif // wxUSE_THREADS
+
+ m_isInsideYield = true;
+ m_eventsToProcessInsideYield = eventsToProcess;
+
+#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
+
+ // temporarily replace the global GDK event handler with our function, which
+ // categorizes the events and using m_eventsToProcessInsideYield decides
+ // if an event should be processed immediately or not
+ // NOTE: this approach is better than using gdk_display_get_event() because
+ // gtk_main_iteration() does more than just calling gdk_display_get_event()
+ // and then call gtk_main_do_event()!
+ // In particular in this way we also process input from sources like
+ // GIOChannels (this is needed for e.g. wxGUIAppTraits::WaitForChild).
+ gdk_event_handler_set(wxgtk_main_do_event, this, NULL);
+ while (Pending()) // avoid false positives from our idle source
+ gtk_main_iteration();
+ gdk_event_handler_set ((GdkEventFunc)gtk_main_do_event, NULL, NULL);
+
+ // Process all pending events too, this is consistent with wxMSW behaviour
+ // and the behaviour of wxGTK itself in the previous versions.
+ if ( wxTheApp )
+ wxTheApp->ProcessPendingEvents();
+
+ if (eventsToProcess != wxEVT_CATEGORY_CLIPBOARD)
+ {
+ // It's necessary to call ProcessIdle() to update the frames sizes which
+ // might have been changed (it also will update other things set from
+ // OnUpdateUI() which is a nice (and desired) side effect). But we
+ // call ProcessIdle() only once since this is not meant for longish
+ // background jobs (controlled by wxIdleEvent::RequestMore() and the
+ // return value of Processidle().
+ ProcessIdle();
+ }
+ //else: if we are inside ~wxClipboardSync() and we call ProcessIdle() and
+ // the user app contains an UI update handler which calls wxClipboard::IsSupported,
+ // then we fall into a never-ending loop...
+
+ // put all unprocessed GDK events back in the queue
+ GdkDisplay* disp = gtk_widget_get_display(wxGetRootWindow());
+ for (size_t i=0; i<m_arrGdkEvents.GetCount(); i++)
+ {
+ GdkEvent* ev = (GdkEvent*)m_arrGdkEvents[i];
+
+ // NOTE: gdk_display_put_event makes a copy of the event passed to it
+ gdk_display_put_event(disp, ev);
+ gdk_event_free(ev);
+ }
+
+ m_arrGdkEvents.Clear();
+
+#if wxUSE_LOG
+ // let the logs be flashed again
+ wxLog::Resume();
+#endif
- gtk_main_iteration();
+ m_isInsideYield = false;
return true;
}
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