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The QWheelEvent class contains parameters that describe a wheel event. More...
#include <qevent.h>
Inherits QEvent.
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 that 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() receives wheel events.
See also QMouseEvent and QWidget::grabMouse().
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().
Constructs a wheel event object.
See also pos(), globalPos(), delta() and state().
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().
Returns the distance that the wheel is rotated expressed in multiples or divisions of WHEEL_DELTA, which is currently set at 120. 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.
Returns the global position of the mouse pointer at the time of the event. This is important on asynchronous window systems such as X11; whenever you move your widgets around in response to mouse events, globalPos() can differ a lot from the current pointer position QCursor::pos().
See also globalX() and globalY().
See also globalY() and globalPos().
See also globalX() and globalPos().
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().
If you move your widgets around in response to mouse events, use globalPos() instead of this function.
See also x(), y() and globalPos().
The returned value is ShiftButton, ControlButton, and AltButton OR'ed together.
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Copyright © 2001 Trolltech | Trademarks | Qt version 3.0.0-beta1-beta1
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