QMediaTimeInterval 类

The QMediaTimeInterval 类表示采用整数精度的时间间隔。 更多...

头: #include <QMediaTimeInterval>
qmake: QT += multimedia

公共函数

QMediaTimeInterval ()
QMediaTimeInterval (qint64 start , qint64 end )
QMediaTimeInterval (const QMediaTimeInterval & other )
bool contains (qint64 time ) const
qint64 end () const
bool isNormal () const
QMediaTimeInterval normalized () const
qint64 start () const
QMediaTimeInterval translated (qint64 offset ) const
QMediaTimeInterval & operator= ( const QMediaTimeInterval & )

详细描述

The QMediaTimeInterval 类表示采用整数精度的时间间隔。

An interval is specified by an inclusive start () 和 end () time. These must be set in the constructor, as this is an immutable class. The specific units of time represented by the class have not been defined - it is suitable for any times which can be represented by a signed 64 bit integer.

The isNormal () method determines if a time interval is normal (a normal time interval has start () <= end ()). A normal interval can be received from an abnormal interval by calling the normalized () 方法。

The contains () method determines if a specified time lies within the time interval.

The translated () method returns a time interval which has been translated forwards or backwards through time by a specified offset.

另请参阅 QMediaTimeRange .

成员函数文档编制

QMediaTimeInterval:: QMediaTimeInterval ()

Constructs an empty interval.

QMediaTimeInterval:: QMediaTimeInterval ( qint64 start , qint64 end )

Constructs an interval with the specified start and end times.

QMediaTimeInterval:: QMediaTimeInterval (const QMediaTimeInterval & other )

Constructs an interval by taking a copy of other .

bool QMediaTimeInterval:: contains ( qint64 time ) const

Returns true if the time interval contains the specified time . That is, start () <= time <= end ().

qint64 QMediaTimeInterval:: end () const

Returns the end time of the interval.

另请参阅 start ().

bool QMediaTimeInterval:: isNormal () const

Returns true if this time interval is normal. A normal time interval has start () <= end ().

另请参阅 normalized ().

QMediaTimeInterval QMediaTimeInterval:: normalized () const

Returns a normalized version of this interval.

start () time of the interval is greater than the end () time, then the returned interval has the start and end times swapped.

qint64 QMediaTimeInterval:: start () const

Returns the start time of the interval.

另请参阅 end ().

QMediaTimeInterval QMediaTimeInterval:: translated ( qint64 offset ) const

Returns a copy of this time interval, translated by a value of offset . An interval can be moved forward through time with a positive offset, or backward through time with a negative offset.

QMediaTimeInterval &QMediaTimeInterval:: operator= ( const QMediaTimeInterval & )

拷贝赋值运算符。