qwt::compat Namespace Reference

Handle differences between Qt5 and Qt6. More...

Functions
template<typename EventType >
QPoint	eventPos (EventType *event)
	Get the event position (QPoint)
template<typename EventType >
int	eventPosX (EventType *event)
	Get the x coordinate of the event.
template<typename EventType >
int	eventPosY (EventType *event)
	Get the y coordinate of the event.
int	horizontalAdvance (const QFontMetrics &fm, const QString &str)
	Calculate the horizontal advance of a string (integer version)
qreal	horizontalAdvanceF (const QFontMetricsF &fm, const QString &str)
	Calculate the horizontal advance of a string (floating-point version)
int	wheelEventDelta (QWheelEvent *e)
	Get vertical wheel delta value compatible with Qt5 and Qt6.
QTimeZone	utcTimeZone ()
	Get the UTC time zone.
QTimeZone	systemTimeZone ()
	Get the system time zone.
QTimeZone	offsetTimeZone (int seconds)
	Create a time zone from an offset in seconds ahead of UTC.

Detailed Description

Handle differences between Qt5 and Qt6.

Function Documentation

eventPos()

template<typename EventType >

QPoint qwt::compat::eventPos ( EventType *  event )

inline

Get the event position (QPoint)

Template Parameters

EventType

Event type (must support pos() or position() method)

Parameters

event

Event pointer

Returns

Event position as QPoint

eventPosX()

template<typename EventType >

int qwt::compat::eventPosX ( EventType *  event )

inline

Get the x coordinate of the event.

Template Parameters

EventType

Event type

Parameters

event

Event pointer

Returns

x coordinate (integer)

eventPosY()

template<typename EventType >

int qwt::compat::eventPosY ( EventType *  event )

inline

Get the y coordinate of the event.

Template Parameters

EventType

Event type

Parameters

event

Event pointer

Returns

y coordinate (integer)

horizontalAdvance()

int qwt::compat::horizontalAdvance ( const QFontMetrics &  fm, const QString &  str  )

inline

Calculate the horizontal advance of a string (integer version)

Parameters

fm	QFontMetrics object
str	Target string

Returns

Width (integer)

horizontalAdvanceF()

qreal qwt::compat::horizontalAdvanceF ( const QFontMetricsF &  fm, const QString &  str  )

inline

Calculate the horizontal advance of a string (floating-point version)

Parameters

fm	QFontMetricsF object
str	Target string

Returns

Width (floating-point)

offsetTimeZone()

QTimeZone qwt::compat::offsetTimeZone ( int  seconds )

inline

Create a time zone from an offset in seconds ahead of UTC.

Parameters

seconds

Offset in seconds from UTC

Returns

QTimeZone with the given offset

Note

QTimeZone::fromSecondsAheadOfUtc() is available since Qt 6.4; for earlier versions the deprecated integer constructor is used.

systemTimeZone()

QTimeZone qwt::compat::systemTimeZone ( )

inline

Get the system time zone.

Returns

QTimeZone representing the system's local time zone

utcTimeZone()

QTimeZone qwt::compat::utcTimeZone ( )

inline

Get the UTC time zone.

Returns

QTimeZone representing UTC

Note

QTimeZone::utc() is available since Qt 6.5; for earlier versions the constructor with the IANA ID "UTC" is used.

wheelEventDelta()

int qwt::compat::wheelEventDelta ( QWheelEvent *  e )

inline

Get vertical wheel delta value compatible with Qt5 and Qt6.

This function provides a unified interface to retrieve the vertical scroll delta from a QWheelEvent, supporting both Qt5 (using delta()) and Qt6 (using angleDelta().y()) without changing the calling code.

The return value represents the vertical scroll amount:

• Positive value: Wheel scrolled up
• Negative value: Wheel scrolled down
• The magnitude follows the standard wheel step (typically ±120 per notch)

Parameters

e	Pointer to the QWheelEvent object (must not be nullptr)

Returns

Integer delta value of vertical wheel movement

Note

The function only returns vertical wheel delta (ignores horizontal scroll via angleDelta().x())

Warning

Ensure the input QWheelEvent pointer is valid to avoid null pointer dereference