The QTapReading class represents one reading from the tap sensor. More...
#include <QTapReading>
Inherits: QSensorReading.
This class was introduced in Qt Mobility 1.0.
| enum | TapDirection { Undefined, X, Y, Z, ..., Z_Both } |
| bool | isDoubleTap () const |
| void | setDoubleTap ( bool doubleTap ) |
| void | setTapDirection ( TapDirection tapDirection ) |
| TapDirection | tapDirection () const |
The QTapReading class represents one reading from the tap sensor.
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.
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) { ... }
| Constant | Value | Description |
|---|---|---|
| QTapReading::Undefined | 0 | This value means that the direction is unknown. |
| QTapReading::X | 0x0001 | This flag is set if the tap was along the X axis. |
| QTapReading::Y | 0x0002 | This flag is set if the tap was along the Y axis. |
| QTapReading::Z | 0x0004 | This flag is set if the tap was along the Z axis. |
| QTapReading::X_Pos | 0x0011 | This flag is set if the tap was towards the positive X direction. |
| QTapReading::Y_Pos | 0x0022 | This flag is set if the tap was towards the positive Y direction. |
| QTapReading::Z_Pos | 0x0044 | This flag is set if the tap was towards the positive Z direction. |
| QTapReading::X_Neg | 0x0101 | This flag is set if the tap was towards the negative X direction. |
| QTapReading::Y_Neg | 0x0202 | This flag is set if the tap was towards the negative Y direction. |
| QTapReading::Z_Neg | 0x0404 | This flag is set if the tap was towards the negative Z direction. |
| QTapReading::X_Both | 0x0111 | Equivalent to X_Pos|X_Neg. Returned by devices that cannot detect the direction of a tap. |
| QTapReading::Y_Both | 0x0222 | Equivalent to Y_Pos|Y_Neg. Returned by devices that cannot detect the direction of a tap. |
| QTapReading::Z_Both | 0x0444 | Equivalent to Z_Pos|Z_Neg. Returned by devices that cannot detect the direction of a tap. |
This property holds a value indicating if there was a single or double tap.
This property was introduced in Qt Mobility 1.0.
Access functions:
| bool | isDoubleTap () const |
See also QTapReading Units.
This property holds the direction of the tap.
This property was introduced in Qt Mobility 1.0.
Access functions:
| TapDirection | tapDirection () const |
See also QTapReading Units.
Sets the double tap status of the reading to doubleTap.
This function was introduced in Qt Mobility 1.0.
See also isDoubleTap().
Sets the tap direction to tapDirection.
This function was introduced in Qt Mobility 1.0.
See also tapDirection().