QTapReading Class

The QTapReading class represents one reading from the tap sensor. More...

Header: #include <QTapReading>
qmake: QT += sensors
Since: Qt 5.1
Inherits: QSensorReading.

Public Types

enum TapDirection { Undefined, X, Y, Z, ..., Z_Both }

Properties

Public Functions

bool isDoubleTap() const
void setDoubleTap(bool doubleTap)
void setTapDirection(TapDirection tapDirection)
TapDirection tapDirection() const

Additional Inherited Members

  • 1 public slot inherited from QObject
  • 2 signals inherited from QObject
  • 11 static public members inherited from QObject
  • 9 protected functions inherited from QObject

Detailed Description

The QTapReading class represents one reading from the tap sensor.

QTapReading Units

The tap sensor registers tap events along the 3 axes that originate from the phone. The axes are arranged as follows.

By default it returns only double tap events. The QTapSensor::returnDoubleTapEvents property must be set to false to return individual tap events.

Member Type Documentation

enum QTapReading::​TapDirection

The tap direction is indicated using flags. Applications should check for the presence of a particular flag as multiple flags may be set at once.

The X, Y and Z flags allow an app to check for taps along an axis without caring about the direction.

if (reading->tapDirection()&QTapReading::X) {
    ...
}

The *_Pos and *_Neg flags allow checking for taps in a specific direction. Note that some devices cannot determine the direction of a tap and will set both the _Pos and _Neg flag for the detected axis. Previous versions of the API did not allow this. Applications that check for the _Pos and _Neg flags as values should be updated so they can work with all devices.

For example, if you have code like

if (reading->tapDirection() == QTapReading::X_Pos) {
    ...
}

you can rewrite it as

if (reading->tapDirection()&QTapReading::X_Pos) {
    ...
}
ConstantValueDescription
QTapReading::Undefined0This value means that the direction is unknown.
QTapReading::X0x0001This flag is set if the tap was along the X axis.
QTapReading::Y0x0002This flag is set if the tap was along the Y axis.
QTapReading::Z0x0004This flag is set if the tap was along the Z axis.
QTapReading::X_Pos0x0011This flag is set if the tap was towards the positive X direction.
QTapReading::Y_Pos0x0022This flag is set if the tap was towards the positive Y direction.
QTapReading::Z_Pos0x0044This flag is set if the tap was towards the positive Z direction.
QTapReading::X_Neg0x0101This flag is set if the tap was towards the negative X direction.
QTapReading::Y_Neg0x0202This flag is set if the tap was towards the negative Y direction.
QTapReading::Z_Neg0x0404This flag is set if the tap was towards the negative Z direction.
QTapReading::X_Both0x0111Equivalent to X_Pos|X_Neg. Returned by devices that cannot detect the direction of a tap.
QTapReading::Y_Both0x0222Equivalent to Y_Pos|Y_Neg. Returned by devices that cannot detect the direction of a tap.
QTapReading::Z_Both0x0444Equivalent to Z_Pos|Z_Neg. Returned by devices that cannot detect the direction of a tap.

Property Documentation

doubleTap : const bool

This property holds a value indicating if there was a single or double tap.

  • true - double tap
  • false - single tap

Access functions:

bool isDoubleTap() const

See also QTapReading Units.

tapDirection : const TapDirection

This property holds the direction of the tap.

Access functions:

TapDirection tapDirection() const

See also QTapReading Units.

Member Function Documentation

void QTapReading::​setDoubleTap(bool doubleTap)

Sets the double tap status of the reading to doubleTap.

See also isDoubleTap().

void QTapReading::​setTapDirection(TapDirection tapDirection)

Sets the tap direction to tapDirection.

See also tapDirection().

© 2015 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.