QWheelEvent Class Reference
The QWheelEvent class contains parameters that describe a wheel event.
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#include <qevent.h>
Inherits QEvent.
List of all member functions.
Public Members
QWheelEvent ( const QPoint & pos, int delta, int state )Â
QWheelEvent ( const QPoint & pos, const QPoint & globalPos, int delta, int state )Â
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const QPoint&Â
pos () const
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ButtonStateÂ
state () const
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Detailed Description
The QWheelEvent class contains parameters that describe a wheel event.
Wheel events occur when a mouse wheel is turned while the widget has
focus. The rotation distance is provided by delta(). The functions
pos() and globalPos() return the mouse pointer location at the
time of the event.
A wheel event contains a special accept flag which tells whether the
receiver wants the event. You should call QWheelEvent::accept() if you
handle the wheel event, otherwise it will be sent to the parent widget.
The QWidget::setEnable() function can be used to enable or disable mouse
and keyboard events for a widget.
The event handler QWidget::wheelEvent() receive wheel events.
See also QMouseEvent and QWidget::grabMouse().
Member Function Documentation
QWheelEvent::QWheelEvent ( const QPoint & pos, const QPoint & globalPos, int delta, int state )
Constructs a wheel event object.
See also pos(), globalPos(), delta() and state().
QWheelEvent::QWheelEvent ( const QPoint & pos, int delta, int state )
Constructs a wheel event object.
The globalPos() is initialized to QCursor::pos(), which usually is
right but not always. Use the other constructor if you need to
specify the global position explicitly.
See also pos(), delta() and state().
void QWheelEvent::accept ()
Sets the accept flag of the wheel event object.
Setting the accept parameter indicates that the receiver of the event wants
the wheel event. Unwanted wheel events are sent to the parent widget.
The accept flag is set by default.
See also ignore().
int QWheelEvent::delta () const
Returns the distance that the wheel is rotated, expressed in
multiples or divisions of WHEEL_DELTA, which is set at 120
currently.A positive value indicates that the wheel was rotated
forward, away from the user; a negative value indicates that the
wheel was rotated backward, toward the user.
The WHEEL_DELTA constant was set to 120 by the wheel mouse vendors
to allow building finer-resolution wheels in the future, including
perhaps a freely-rotating wheel with no notches. The expectation is
that such a device would send more messages per rotation, but with a
smaller value in each message.
const QPoint & QWheelEvent::globalPos () const
Returns the global position of the mouse pointer at the time of the event. This is important on asynchronous window systems
like X11: Whenever you move your widgets around in response to mouse
evens, globalPos() can differ a lot from the current pointer
position QCursor::pos().
See also globalX() and globalY().
int QWheelEvent::globalX () const
Returns the global X position of the mouse pointer at the time of the event
See also globalY() and globalPos().
int QWheelEvent::globalY () const
Returns the global Y position of the mouse pointer at the time of the event
See also globalX() and globalPos().
void QWheelEvent::ignore ()
Clears the accept flag parameter of the wheel event object.
Clearing the accept parameter indicates that the event receiver does
not want the wheel event. Unwanted wheel events are sent to the parent widget.
The accept flag is set by default.
See also accept().
bool QWheelEvent::isAccepted () const
Returns TRUE if the receiver of the event handles the wheel event.
const QPoint & QWheelEvent::pos () const
Returns the position of the mouse pointer, relative to the widget that
received the event.
If you move your widgets around in response to mouse
evens, use globalPos() instead of this function.
See also x(), y() and globalPos().
ButtonState QWheelEvent::state () const
Returns the keyboard modifier flags of the event.
The returned value is ShiftButton, ControlButton and AltButton
OR'ed together.
int QWheelEvent::x () const
Returns the X position of the mouse pointer, relative to the widget that
received the event.
See also y() and pos().
int QWheelEvent::y () const
Returns the Y position of the mouse pointer, relative to the widget that
received the event.
See also x() and pos().
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