WheelEvent Class

WheelEvent class

The WheelEvent interface provides specific contextual information associated with wheel events. To create an instance of the WheelEvent interface, use the WheelEvent constructor, passing an optional WheelEventInit dictionary.

public class WheelEvent : MouseEvent

Constructors

Name	Description
WheelEvent(String)	Initializes a new instance of the `WheelEvent` class.
WheelEvent(String, IDictionary<String, object>)

Properties

Name	Description
getAltKey Refer to the altKey attribute.
getBubbles Used to indicate whether or not an event is a bubbling event. If the event can bubble the value is true, else the value is false.
getButton During mouse events caused by the depression or release of a mouse button, button MUST be used to indicate which pointer device button changed state.
getButtons During any mouse events, buttons MUST be used to indicate which combination of mouse buttons are currently being pressed, expressed as a bitmask.
getCancelable Used to indicate whether or not an event can have its default action prevented. If the default action can be prevented the value is true, else the value is false.
getClientX The horizontal coordinate at which the event occurred relative to the viewport associated with the event.
getClientY The vertical coordinate at which the event occurred relative to the viewport associated with the event.
getCtrlKey Refer to the ctrlKey attribute.
getCurrentTarget Used to indicate the `IEventTarget` whose `IEventListener`s are currently being processed. This is particularly useful during capturing and bubbling.
getDefaultPrevented Returns true if preventDefault() was invoked while the cancelable attribute value is true, and false otherwise.
getDeltaMode The deltaMode attribute contains an indication of the units of measurement for the delta values. The default value is DOM_DELTA_PIXEL (pixels).
getDeltaX In user agents where the default action of the wheel event is to scroll, the value MUST be the measurement along the x-axis (in pixels, lines, or pages) to be scrolled in the case where the event is not cancelled. Otherwise, this is an implementation-specific measurement (in pixels, lines, or pages) of the movement of a wheel device around the x-axis.
getDeltaY In user agents where the default action of the wheel event is to scroll, the value MUST be the measurement along the y-axis (in pixels, lines, or pages) to be scrolled in the case where the event is not cancelled. Otherwise, this is an implementation-specific measurement (in pixels, lines, or pages) of the movement of a wheel device around the y-axis.
getDeltaZ In user agents where the default action of the wheel event is to scroll, the value MUST be the measurement along the z-axis (in pixels, lines, or pages) to be scrolled in the case where the event is not cancelled. Otherwise, this is an implementation-specific measurement (in pixels, lines, or pages) of the movement of a wheel device around the z-axis.
getDetail Specifies some detail information about the Event, depending on the type of event.
getEventPhase Used to indicate which phase of event flow is currently being evaluated.
getIsTrusted The isTrusted attribute must return the value it was initialized to. When an event is created the attribute must be initialized to false.
getMetaKey Refer to the metaKey attribute.
getRelatedTarget Used to identify a secondary EventTarget related to a UI event, depending on the type of event.
getScreenX The horizontal coordinate at which the event occurred relative to the origin of the screen coordinate system.
getScreenY The vertical coordinate at which the event occurred relative to the origin of the screen coordinate system.
getShiftKey Refer to the shiftKey attribute.
getTarget Used to indicate the `IEventTarget` to which the event was originally dispatched.
getTimeStamp Used to specify the time (in milliseconds relative to the epoch) at which the event was created. Due to the fact that some systems may not provide this information the value of timeStamp may be not available for all events. When not available, a value of 0 will be returned. Examples of epoch time are the time of the system start or 0:0:0 UTC 1st January 1970.
getType The name of the event (case-insensitive). The name must be an XML name.
getView The view attribute identifies the Window from which the event was generated. The un-initialized value of this attribute MUST be null.

Methods

Name	Description
getPlatformType()	This method is used to retrieve the ECMAScript object .
initEvent(String, bool, bool)	The `InitEvent` method is used to initialize the value of an `Event` created through the`IDocumentEvent` interface.
preventDefault()	If an event is cancelable, the `PreventDefault` method is used to signify that the event is to be canceled, meaning any default action normally taken by the implementation as a result of the event will not occur.
stopImmediatePropagation()	Invoking this method prevents event from reaching any event listeners registered after the current one and when dispatched in a tree also prevents event from reaching any other objects.
stopPropagation()	The `StopPropagation` method is used prevent further propagation of an event during event flow.

Fields

Name	Description
const DOM_DELTA_LINE	The units of measurement for the delta MUST be individual lines of text. This is the case for many form controls.
const DOM_DELTA_PAGE	The units of measurement for the delta MUST be pages, either defined as a single screen or as a demarcated page.
const DOM_DELTA_PIXEL	The units of measurement for the delta MUST be pixels. This is the most typical case in most operating system and implementation configurations.