diff options
Diffstat (limited to 'src/gui/kernel/qwindowsysteminterface.cpp')
| -rw-r--r-- | src/gui/kernel/qwindowsysteminterface.cpp | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/gui/kernel/qwindowsysteminterface.cpp b/src/gui/kernel/qwindowsysteminterface.cpp index ad9a3d20397..6cfcce04bfa 100644 --- a/src/gui/kernel/qwindowsysteminterface.cpp +++ b/src/gui/kernel/qwindowsysteminterface.cpp @@ -630,6 +630,33 @@ void QWindowSystemInterface::registerInputDevice(const QInputDevice *device) QInputDevicePrivate::registerDevice(device); } +/*! + \internal + Convert a list of \l QWindowSystemInterface::TouchPoint \a points to a list + of \em temporary QEventPoint instances, scaled (but not localized) + for delivery to the given \a window. + + This is called from QWindowSystemInterface::handleTouchEvent(): + that is too early to update the QEventPoint instances in QPointingDevice, + because we want those to hold "current" state from the applcation's + point of view. The QWindowSystemInterfacePrivate::TouchEvent, to which + the returned touchpoints will "belong", might go through the queue before + being processed; the application doesn't see the equivalent QTouchEvent + until later on. Therefore the responsibility to update the QEventPoint + instances in QPointingDevice is in QGuiApplication, not here. + + QGuiApplicationPrivate::processMouseEvent() also calls this function + when it synthesizes a touch event from a mouse event. But that's outside + the normal use case. + + It might be better if we change all the platform plugins to create + temporary instances of QEventPoint directly, and remove + QWindowSystemInterface::TouchPoint completely. Then we will no longer need + this function either. But that's only possible as long as QEventPoint + remains a Q_GADGET, not a QObject, so that it continues to be small and + suitable for temporary stack allocation. QEventPoint is a little bigger + than QWindowSystemInterface::TouchPoint, though. +*/ QList<QEventPoint> QWindowSystemInterfacePrivate::fromNativeTouchPoints(const QList<QWindowSystemInterface::TouchPoint> &points, const QWindow *window, QEvent::Type *type) |