path: root/src/plugins/generic
diff options
authorLaszlo Agocs <>2011-11-27 17:42:23 +0200
committerQt by Nokia <>2011-12-09 14:15:37 +0100
commit4222603f8ea3a0d0ef5b9a190605ad86e00f27f6 (patch)
tree2ace610731b845e4e04e6ea8f0def0ce3aee31a4 /src/plugins/generic
parent2c4879a7676d6a75379ac6ff24ac4c2a6c2b9658 (diff)
Extend touch events.
The capability flags indicate which information is valid in the touch points. Previously there was no way to tell if e.g. the value returned by pressure() is actually the value provided by the driver/device or it is just something bogus due to pressure not being supported. The points' flags return information about the individual touch points. One use case is to differentiate between touches made by finger and pen. Velocity, if available, is now also exposed. Each touch point can now contain an additional list of "raw" positions. These points are not reported individually but are taken into account in some way by the underlying device and drivers to generate the final, "accurate" touch point. In case the underlying drivers expose these additional positions, they are made available in the lists returned by the touch points' rawScreenPosition(). The raw positions are only available in screen coordinates to prevent wasting time with mapping from global positions in applications that do not use this data. Instead, apps can query the QWindow to which the touch event was sent via QTouchEvent::window() and can call mapFromGlobal() manually if they need local raw positions. The capability and device type information is now held in a new QTouchDevice class. Each touch event will contain only a pointer to one of the global QTouchDevice instances. On top of type and capability, the new class also contains a name which can be used to differentiate between multiple touch input devices (i.e. to tell from which one a given QTouchEvent originates from). The introduction of QTouchDevice has three implications: The QTouchEvent constructor and QWindowSystemInterface::handleTouchEvent need to be changed (to pass a QTouchDevice pointer instead of merely a device type value), and each platform or generic plug-in is now responsible for registering one or more devices using the new API QWindowSystemInterface::registerTouchDevice. Change-Id: Ic1468d3e43933d8b5691d75aa67c43e1bc7ffe3e Reviewed-by: Lars Knoll <>
Diffstat (limited to 'src/plugins/generic')
2 files changed, 8 insertions, 1 deletions
diff --git a/src/plugins/generic/touchscreen/qtoucheventsenderqpa.cpp b/src/plugins/generic/touchscreen/qtoucheventsenderqpa.cpp
index d9ec92cda7..08db058e10 100644
--- a/src/plugins/generic/touchscreen/qtoucheventsenderqpa.cpp
+++ b/src/plugins/generic/touchscreen/qtoucheventsenderqpa.cpp
@@ -52,6 +52,10 @@ QT_BEGIN_NAMESPACE
QTouchEventSenderQPA::QTouchEventSenderQPA(const QString &spec)
m_forceToActiveWindow = spec.split(QLatin1Char(':')).contains(QLatin1String("force_window"));
+ m_device = new QTouchDevice;
+ m_device->setType(QTouchDevice::TouchScreen);
+ m_device->setCapabilities(QTouchDevice::Position | QTouchDevice::Area);
+ QWindowSystemInterface::registerTouchDevice(m_device);
void QTouchEventSenderQPA::touch_configure(int x_min, int x_max, int y_min, int y_max)
@@ -103,7 +107,7 @@ void QTouchEventSenderQPA::touch_point(QEvent::Type state,
- QWindowSystemInterface::handleTouchEvent(0, state, QTouchEvent::TouchScreen, touchPoints);
+ QWindowSystemInterface::handleTouchEvent(0, state, m_device, touchPoints);
diff --git a/src/plugins/generic/touchscreen/qtoucheventsenderqpa.h b/src/plugins/generic/touchscreen/qtoucheventsenderqpa.h
index 91a6b4f3bb..b6e1613b24 100644
--- a/src/plugins/generic/touchscreen/qtoucheventsenderqpa.h
+++ b/src/plugins/generic/touchscreen/qtoucheventsenderqpa.h
@@ -48,6 +48,8 @@ QT_BEGIN_HEADER
+class QTouchDevice;
class QTouchEventSenderQPA : public QTouchScreenObserver
@@ -61,6 +63,7 @@ private:
int hw_range_x_max;
int hw_range_y_min;
int hw_range_y_max;
+ QTouchDevice *m_device;