Qt 4.8
qwinnativepangesturerecognizer_win.cpp
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41 
42 #include "private/qwinnativepangesturerecognizer_win_p.h"
43 
44 #include "qevent.h"
45 #include "qgraphicsitem.h"
46 #include "qgesture.h"
47 
48 #include "private/qgesture_p.h"
49 #include "private/qevent_p.h"
50 #include "private/qapplication_p.h"
51 #include "private/qwidget_p.h"
52 
53 #ifndef QT_NO_GESTURES
54 
56 
57 #if !defined(QT_NO_NATIVE_GESTURES)
58 
60 {
61 }
62 
64 {
65  if (!target)
66  return new QPanGesture; // a special case
67  if (!target->isWidgetType())
68  return 0;
69  if (qobject_cast<QGraphicsObject *>(target))
70  return 0;
71 
72  QWidget *q = static_cast<QWidget *>(target);
73  QWidgetPrivate *d = q->d_func();
74  d->nativeGesturePanEnabled = true;
75  d->winSetupGestures();
76 
77  return new QPanGesture;
78 }
79 
80 QGestureRecognizer::Result QWinNativePanGestureRecognizer::recognize(QGesture *state,
81  QObject *,
82  QEvent *event)
83 {
84  QPanGesture *q = static_cast<QPanGesture*>(state);
85  QPanGesturePrivate *d = q->d_func();
86 
87  QGestureRecognizer::Result result = QGestureRecognizer::Ignore;
88  if (event->type() == QEvent::NativeGesture) {
89  QNativeGestureEvent *ev = static_cast<QNativeGestureEvent*>(event);
90  switch(ev->gestureType) {
92  break;
95  event->accept();
96  break;
98  if (q->state() == Qt::NoGesture)
99  return QGestureRecognizer::Ignore; // some other gesture has ended
101  break;
102  default:
104  }
105  if (q->state() == Qt::NoGesture) {
106  d->lastOffset = d->offset = QPointF();
107  d->startPosition = ev->position;
108  } else {
109  d->lastOffset = d->offset;
110  d->offset = QPointF(ev->position.x() - d->startPosition.x(),
111  ev->position.y() - d->startPosition.y());
112  }
113  }
114  return result;
115 }
116 
118 {
119  QPanGesture *pan = static_cast<QPanGesture*>(state);
120  QPanGesturePrivate *d = pan->d_func();
121 
122  d->lastOffset = d->offset = QPointF();
123  d->startPosition = QPoint();
124  d->acceleration = 0;
125 
127 }
128 
129 #endif // QT_NO_NATIVE_GESTURES
130 
132 
133 #endif // QT_NO_GESTURES
double d
Definition: qnumeric_p.h:62
The QPanGesture class describes a panning gesture made by the user.
Definition: qgesture.h:107
#define QT_END_NAMESPACE
This macro expands to.
Definition: qglobal.h:90
EventRef event
The QPointF class defines a point in the plane using floating point precision.
Definition: qpoint.h:214
The QWidget class is the base class of all user interface objects.
Definition: qwidget.h:150
The QObject class is the base class of all Qt objects.
Definition: qobject.h:111
#define QT_BEGIN_NAMESPACE
This macro expands to.
Definition: qglobal.h:89
virtual void reset(QGesture *state)
This function is called by the framework to reset a given gesture.
Qt::GestureState state() const
bool isWidgetType() const
Returns true if the object is a widget; otherwise returns false.
Definition: qobject.h:146
The QGesture class represents a gesture, containing properties that describe the corresponding user i...
Definition: qgesture.h:64
The QPoint class defines a point in the plane using integer precision.
Definition: qpoint.h:53
int y() const
Returns the y coordinate of this point.
Definition: qpoint.h:131
int x() const
Returns the x coordinate of this point.
Definition: qpoint.h:128
void reset(QGesture *state)
This function is called by the framework to reset a given gesture.
QGestureRecognizer::Result recognize(QGesture *state, QObject *watched, QEvent *event)
Handles the given event for the watched object, updating the state of the gesture object as required...
The QEvent class is the base class of all event classes.
Definition: qcoreevent.h:56
Type type() const
Returns the event type.
Definition: qcoreevent.h:303
QGesture * create(QObject *target)
This function is called by Qt to create a new QGesture object for the given target (QWidget or QGraph...