QTapReading Class

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

头: #include <QTapReading>
qmake: QT += sensors
Since: Qt 5.1
继承: QSensorReading

该类在 Qt 5.1 引入。

公共类型

enum TapDirection { Undefined, X, Y, Z, X_Pos, …, Z_Both }

特性

公共函数

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

详细描述

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.

成员类型文档编制

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.

例如,若有代码像

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

可以把它重写成

 if (reading->tapDirection()&QTapReading::X_Pos) {
     ...
 }
					
常量 描述
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 相当于 X_Pos|X_Neg . Returned by devices that cannot detect the direction of a tap.
QTapReading::Y_Both 0x0222 相当于 Y_Pos|Y_Neg . Returned by devices that cannot detect the direction of a tap.
QTapReading::Z_Both 0x0444 相当于 Z_Pos|Z_Neg . Returned by devices that cannot detect the direction of a tap.

特性文档编制

doubleTap : const bool

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

  • true - double tap
  • false - single tap

访问函数:

bool isDoubleTap () const

另请参阅 QTapReading Units .

tapDirection : const TapDirection

This property holds the direction of the tap.

访问函数:

QTapReading::TapDirection tapDirection () const

另请参阅 QTapReading Units .

成员函数文档编制

void QTapReading:: setDoubleTap ( bool doubleTap )

Sets the double tap status of the reading to doubleTap .

另请参阅 isDoubleTap ().

void QTapReading:: setTapDirection ( QTapReading::TapDirection tapDirection )

Sets the tap direction to tapDirection .

另请参阅 tapDirection ().