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touchapplication.cpp
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touchapplication.cpp
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#include "touchapplication.h"
#include "touchinputfilter.h"
#include <QWindow>
#include <QWidget>
#include <QTabletEvent>
int TouchApplication::m_tabletButtons = 0;
TouchApplication::TouchApplication(int& argc, char** argv) : QApplication(argc, argv), inputState(None)
{
// prevent Qt from handling touch to mouse translation
QCoreApplication::setAttribute(Qt::AA_SynthesizeMouseForUnhandledTouchEvents, false);
acceptCount = 0;
#ifdef Q_OS_WIN
// native event filter for handling WM_POINTER messages
installNativeEventFilter(new WinInputFilter);
#endif
}
bool TouchApplication::sendMouseEvent(QObject* receiver, QEvent::Type mevtype, QPoint globalpos, Qt::KeyboardModifiers modifiers)
{
QPoint localpos = globalpos;
if(receiver->isWidgetType())
localpos = static_cast<QWidget*>(receiver)->mapFromGlobal(globalpos);
else if(receiver->isWindowType())
localpos = static_cast<QWindow*>(receiver)->mapFromGlobal(globalpos);
QMouseEvent* mouseevent = new QMouseEvent(mevtype, localpos, globalpos,
mevtype == QEvent::MouseMove ? Qt::NoButton : Qt::LeftButton,
mevtype == QEvent::MouseButtonRelease ? Qt::NoButton : Qt::LeftButton, modifiers);
if(mevtype == QEvent::MouseButtonRelease) {
// set low priority to ensure release event is processed after any potential events generated by press
// another option might be to call processEvents() before postEvent() or notify() for release event
postEvent(receiver, mouseevent, Qt::LowEventPriority);
// send an offscreen move event with no buttons (i.e., hover) to workaround problems with press-drag-release on menus
QPoint offscreen(-10000, -10000);
QMouseEvent* ev2 = new QMouseEvent(QEvent::MouseMove, offscreen, offscreen, Qt::NoButton, Qt::NoButton, modifiers);
postEvent(receiver, ev2, Qt::LowEventPriority);
}
else
postEvent(receiver, mouseevent);
//return QApplication::notify(receiver, &mouseevent);
return true;
}
QObject* TouchApplication::getRecvWindow(QObject* candidate)
{
if(candidate->isWindowType()) {
QWidget* popup = activePopupWidget();
if(!popup)
popup = activeModalWidget();
if(popup) {
QWindow* w = popup->windowHandle();
if(w)
return w;
}
}
return candidate;
}
// override QApplication::notify() for greatest control over event handling
bool TouchApplication::notify(QObject* receiver, QEvent* event)
{
//DebugEventFilter::printEvent(receiver, event);
QEvent::Type evtype = event->type();
// first, try to pass TabletPress/TouchBegin event and see if anyone accepts it
// In Qt, events are first sent to a QWindow, which then figures out what widget they should be sent to.
// Unfortunately, QWindow event handler always returns true and doesn't change accepted state of event (it
// sends a copy of the event and discards the accepted state of the copy), so we must save result from
// sending event to final widget (by incrementing acceptCount)
// When faking mouse events, we must send them to the QWindow instead of a widget, since some of the
// routing logic is there, e.g., for handling popup windows
if((evtype == QEvent::TabletPress || evtype == QEvent::TouchBegin) && inputState == None) {
if(receiver->isWindowType()) {
int prevacceptcount = acceptCount;
receiver = getRecvWindow(receiver);
QApplication::notify(receiver, event);
if(acceptCount > prevacceptcount) {
acceptCount = prevacceptcount;
inputState = PassThru;
return true;
}
// else, fall through and resend as mouse event
// we must send a tablet release to put QWidgetWindow in consistent state
// doesn't appear to be necessary for TouchBegin
if(evtype == QEvent::TabletPress) {
QTabletEvent* tev = static_cast<QTabletEvent*>(event);
QTabletEvent rlev(QEvent::TabletRelease, tev->posF(), tev->globalPosF(), tev->device(),
tev->pointerType(), 0, 0, 0, 0, 0, 0, tev->modifiers(), tev->uniqueId());
QApplication::notify(receiver, &rlev);
}
}
else {
event->setAccepted(false);
bool res = QApplication::notify(receiver, event);
if(event->isAccepted())
acceptCount++;
return res;
}
}
switch(evtype) {
// reject external mouse events if we are translating touch or tablet input
case QEvent::MouseButtonRelease:
case QEvent::MouseMove:
case QEvent::MouseButtonPress:
// QWidgetWindow always forwards mouse event to widget as spontaneous event (why?)
if(inputState != None && event->spontaneous() && receiver->isWindowType())
return true; // qDebug("This event should be rejected!");
break;
case QEvent::TabletRelease:
if(inputState == PassThru)
inputState = None;
case QEvent::TabletMove:
case QEvent::TabletPress:
{
// TODO: should this only be done if inputState == TabletInput?
receiver = getRecvWindow(receiver);
QTabletEvent* tabletevent = static_cast<QTabletEvent*>(event);
QEvent::Type mevtype = QEvent::MouseMove;
if(inputState == None && evtype == QEvent::TabletPress) {
mevtype = QEvent::MouseButtonPress;
inputState = TabletInput;
}
else if(inputState != TabletInput) // this covers PassThru
break;
if(evtype == QEvent::TabletRelease) {
mevtype = QEvent::MouseButtonRelease;
inputState = None;
}
return sendMouseEvent(receiver, mevtype, tabletevent->globalPos(), tabletevent->modifiers());
}
#ifdef QT_5
case QEvent::TouchCancel:
evtype = QEvent::TouchEnd;
#endif
case QEvent::TouchEnd:
if(inputState == PassThru) // && touchPoints.count() == 1)
inputState = None;
case QEvent::TouchUpdate:
case QEvent::TouchBegin:
{
receiver = getRecvWindow(receiver);
QTouchEvent* touchevent = static_cast<QTouchEvent*>(event);
QEvent::Type mevtype = QEvent::MouseMove;
if(inputState == None && evtype == QEvent::TouchBegin
&& touchevent->touchPoints().size() == 1 && touchevent->device()->type() != QTouchDevice::TouchPad) {
activeTouchId = touchevent->touchPoints().first().id();
mevtype = QEvent::MouseButtonPress;
inputState = TouchInput;
}
else if(inputState != TouchInput) // this covers PassThru
break;
if(evtype == QEvent::TouchEnd)
inputState = None;
event->setAccepted(true);
QList<QTouchEvent::TouchPoint> touchPoints = touchevent->touchPoints();
for(int ii = 0; ii < touchPoints.count(); ++ii) {
const QTouchEvent::TouchPoint& touchpt = touchPoints.at(ii);
if(touchpt.id() == activeTouchId) {
if(touchpt.state() == Qt::TouchPointReleased) {
mevtype = QEvent::MouseButtonRelease;
activeTouchId = -1;
}
return sendMouseEvent(receiver, mevtype, touchpt.screenPos().toPoint(), touchevent->modifiers());
}
}
// swallow all touch events until TouchEnd
// another option would be to propagate the touch event with the activeTouchId point removed, if >1 point
return true;
}
default:
break;
}
return QApplication::notify(receiver, event);
}
#if defined(Q_OS_WIN) && !defined(QT_5)
bool TouchApplication::winEventFilter(MSG* m, long* result)
{
return WinInputFilter::winInputEvent(m, result);
}
#endif