+
+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);
+
+ 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(); // ProcessIdle() also calls ProcessPendingEvents()
+ }
+ //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
+
+ m_isInsideYield = false;
+
+ return true;
+}
projects / wxWidgets.git / blobdiff