Changeset 66278 in vbox for trunk/src/VBox

Timestamp:

Mar 28, 2017 7:23:13 AM (8 years ago)

Author:

vboxsync

Message:

FE/Qt: bugref:8773: macOS: Workaround for a mouse input events lag.

File:

• trunk/src/VBox/Frontends/VirtualBox/src/runtime/UIMouseHandler.cpp (modified) (1 diff)

trunk/src/VBox/Frontends/VirtualBox/src/runtime/UIMouseHandler.cpp

@@ -688 +688 @@
 #endif /* VBOX_WS_MAC */
                 case QEvent::MouseMove:
+                {
+#ifdef VBOX_WS_MAC
+                    // WORKAROUND:
+                    // Since we are handling mouse move/drag events in the same thread
+                    // where we are painting guest content changes corresponding to those
+                    // events, we can have input event queue overloaded with the move/drag
+                    // events, so we should discard current one if there is subsequent already.
+                    EventTypeSpec list[2];
+                    list[0].eventClass = kEventClassMouse;
+                    list[0].eventKind = kEventMouseMoved;
+                    list[1].eventClass = kEventClassMouse;
+                    list[1].eventKind = kEventMouseDragged;
+                    if (AcquireFirstMatchingEventInQueue(GetCurrentEventQueue(), 2, list,
+                                                         kEventQueueOptionsNone) != NULL)
+                        return true;
+#endif /* VBOX_WS_MAC */
+                }
                 case QEvent::MouseButtonRelease:
                 {