Detailed Description
The QTabletEvent class contains parameters that describe a Tablet
event.
Tablet Events are generated from a Wacom© tablet. Most of
the time you will want to deal with events from the tablet as if
they were events from a mouse, for example retrieving the position
with x(), y(), pos(), globalX(), globalY() and globalPos(). In
some situations you may wish to retrieve the extra information
provided by the tablet device driver, for example, you might want
to adjust color brightness based on pressure. QTabletEvent allows
you to get the pressure(), the xTilt() and yTilt(), as well as the
type of device being used with device() (see TabletDevice).
A tablet event contains a special accept flag that indicates
whether the receiver wants the event. You should call
QTabletEvent::accept() if you handle the tablet event; otherwise
it will be sent to the parent widget.
The QWidget::setEnabled() function can be used to enable or
disable mouse and keyboard events for a widget.
The event handler QWidget::tabletEvent() receives all three types of tablet
events. Qt will first send a tabletEvent and then, if it is not accepted,
it will send a mouse event. This allows applications that don't utilize
tablets to use a tablet like a mouse while also enabling those who want to
use both tablets and mouses differently.
See also Event Classes.
Member Type Documentation
QTabletEvent::TabletDevice
This enum defines what type of device is generating the event.
- QTabletEvent::NoDevice - No device, or an unknown device.
- QTabletEvent::Puck - A Puck (a device that is similar to a flat mouse with
a transparent circle with cross-hairs).
- QTabletEvent::Stylus - A Stylus (the narrow end of the pen).
- QTabletEvent::Eraser - An Eraser (the broad end of the pen).
Member Function Documentation
QTabletEvent::QTabletEvent ( Type t, const QPoint & pos, const QPoint & globalPos, int device, int pressure, int xTilt, int yTilt, const QPair<int, int> & uId )
Construct a tablet event of type t. The position of when the event occurred is given
int pos and globalPos. device contains the device type,
pressure contains the pressure exerted on the device, xTilt and yTilt contain
device's degree of tilt from the X and Y axis respectively. The uId contains an
event id.
On Irix, globalPos will contain the high-resolution coordinates received from the
tablet device driver, instead of from the windowing system.
See also pos(), globalPos(), device(), pressure(), xTilt(), and yTilt().
QTabletEvent::QTabletEvent ( const QPoint & pos, const QPoint & globalPos, int device, int pressure, int xTilt, int yTilt, const QPair<int, int> & uId )
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Constructs a tablet event object. The position when the event
occurred is is given in pos and globalPos. device
contains the device type, pressure
contains the pressure exerted on the device, xTilt and yTilt contain the device's degrees of tilt from the X and Y
axis respectively. The uId contains an event id.
On Irix, globalPos will contain the high-resolution coordinates
received from the tablet device driver, instead of from the
windowing system.
See also pos(), globalPos(), device(), pressure(), xTilt(), and yTilt().
void QTabletEvent::accept ()
Sets the accept flag of the tablet event object.
Setting the accept flag indicates that the receiver of the event
wants the tablet event. Unwanted tablet events are sent to the
parent widget.
The accept flag is set by default.
See also ignore().
TabletDevice QTabletEvent::device () const
Returns the type of device that generated the event. Useful if you
want one end of the pen to do something different than the other.
See also TabletDevice.
const QPoint & QTabletEvent::globalPos () const
Returns the global position of the device at the time of the event. This is important on asynchronous windows systems like X11;
whenever you move your widgets around in response to mouse events,
globalPos() can differ significantly from the current position
QCursor::pos().
See also globalX() and globalY().
int QTabletEvent::globalX () const
Returns the global x-position of the mouse pointer at the time of
the event.
See also globalY() and globalPos().
int QTabletEvent::globalY () const
Returns the global y-position of the mouse pointer at the time of
the event.
See also globalX() and globalPos().
void QTabletEvent::ignore ()
Clears the accept flag parameter of the tablet event object.
Clearing the accept flag indicates that the event receiver does
not want the tablet event. Unwanted tablet events are sent to the
parent widget.
The accept flag is set by default.
See also accept().
int QTabletEvent::isAccepted () const
Returns TRUE if the receiver of the event handles the tablet
event; otherwise returns FALSE.
const QPoint & QTabletEvent::pos () const
Returns the position of the device, relative to the widget that
received the event.
If you move widgets around in response to mouse events, use
globalPos() instead of this function.
See also x(), y(), and globalPos().
int QTabletEvent::pressure () const
Returns the pressure that is exerted on the device. This number is
a value from 0 (no pressure) to 255 (maximum pressure). The
pressure is always scaled to be within this range no matter how
many pressure levels the underlying hardware supports.
QPair<int, int> QTabletEvent::uniqueId ()
Returns a unique ID for the current device. It is possible to
generate a unique ID for any Wacom© device. This makes it
possible to differentiate between multiple devices being used at
the same time on the tablet. The first member contains a value
for the type, the second member contains a physical ID obtained
from the device. Each combination of these values is unique. Note:
for different platforms, the first value is different due to
different driver implementations.
int QTabletEvent::x () const
Returns the x-position of the device, relative to the widget that
received the event.
See also y() and pos().
int QTabletEvent::xTilt () const
Returns the difference from the perpendicular in the X Axis.
Positive values are towards the tablet's physical right. The angle
is in the range -60 to +60 degrees.
See also yTilt().
int QTabletEvent::y () const
Returns the y-position of the device, relative to the widget that
received the event.
See also x() and pos().
int QTabletEvent::yTilt () const
Returns the difference from the perpendicular in the Y Axis.
Positive values are towards the bottom of the tablet. The angle is
within the range -60 to +60 degrees.
See also xTilt().
This file is part of the Qt toolkit.
Copyright © 1995-2003
Trolltech. All Rights Reserved.
