QWheelEvent

Hierarchy

  • QWheelEvent

Index

Constructors

Properties

Methods

Constructors

constructor

+ new QWheelEvent(event: NativeElement): QWheelEvent

Parameters:

NameType
eventNativeElement

Returns: QWheelEvent

Properties

native

native: NativeElement

Methods

angleDelta

angleDelta(): object

Returns the relative amount that the wheel was rotated, in eighths of a degree. A positive value indicates that the wheel was rotated forwards away from the user; a negative value indicates that the wheel was rotated backwards toward the user.

angleDelta().y() provides the angle through which the common vertical mouse wheel was rotated since the previous event. angleDelta().x() provides the angle through which the horizontal mouse wheel was rotated, if the mouse has a horizontal wheel; otherwise it stays at zero.

Some mice allow the user to tilt the wheel to perform horizontal scrolling, and some touchpads support a horizontal scrolling gesture; that will also appear in angleDelta().x().

Most mouse types work in steps of 15 degrees, in which case the delta value is a multiple of 120; i.e., 120 units * 1/8 = 15 degrees.

However, some mice have finer-resolution wheels and send delta values that are less than 120 units (less than 15 degrees). To support this possibility, you can either cumulatively add the delta values from events until the value of 120 is reached, then scroll the widget, or you can partially scroll the widget in response to each wheel event.

But to provide a more native feel, you should prefer pixelDelta() on platforms where it's available.

Returns: object

  • x: number

  • y: number


buttons

buttons(): number

Returns: number


globalPosition

globalPosition(): object

Returns the global position of the mouse pointer at the time of the event. This is important on asynchronous window systems such as X11; whenever you move your widgets around in response to mouse events, globalPosition() can differ a lot from the current cursor position returned by QCursor::pos().

Returns: object

  • x: number

  • y: number


inverted

inverted(): boolean

Returns whether the delta values delivered with the event are inverted

Returns: boolean


phase

phase(): ScrollPhase

Returns: ScrollPhase


pixelDelta

pixelDelta(): object

Returns the scrolling distance in pixels on screen. This value is provided on platforms that support high-resolution pixel-based delta values, such as macOS. The value should be used directly to scroll content on screen

Note:On X11 this value is driver specific and unreliable, use angleDelta() instead

Returns: object

  • x: number

  • y: number


position

position(): object

Returns the position of the mouse cursor relative to the widget that received the event. If you move your widgets around in response to mouse events, use globalPosition() instead of this function. This function was introduced in Qt 5.14

Returns: object

  • x: number

  • y: number