内容

• 公共类型
• 特性
• 公共函数
• 详细描述
• QTapReading Units

QTapReading Class

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

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

• 所有成员列表，包括继承成员

公共类型

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

特性

• doubleTap : const bool
• tapDirection : const TapDirection

• 1 特性继承自 QSensorReading
• 1 特性继承自 QObject

公共函数

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

• 4 public functions inherited from QSensorReading
• 32 公共函数继承自 QObject

额外继承成员

• 1 公共槽继承自 QObject
• 2 信号继承自 QObject
• 11 静态公共成员继承自 QObject
• 9 保护函数继承自 QObject

详细描述

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.

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.

For example, if you have code like

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

you can rewrite it as

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