# OHOS::ListScrollListener ## **Overview** **Related Modules:** [Graphic](Graphic.md) **Description:** Represents a listener that contains a callback to be invoked when the scroll state changes or when a new child view is selected at the preset position as this list scrolls. The scroll state can be \{**\} or SCROLL\_STATE\_MOVE\}. ** **Since:** 1.0 **Version:** 1.0 ## **Summary** ## Public Member Functions

Public Member Function Name

Description

ListScrollListener ()

 

A constructor used to create a ListScrollListener instance with the default state SCROLL_STATE_STOP.

~ListScrollListener ()

virtual 

A destructor used to delete the ListScrollListener instance.

OnScrollStart (int16_t index, UIView *view)

virtual void 

Called when a scroll starts.

OnScrollEnd (int16_t index, UIView *view)

virtual void 

Called when a scroll ends.

OnItemSelected (int16_t index, UIView *view)

virtual void 

Called when a new child view is selected at the preset position as this list scrolls. For details about how to set the position, see SetSelectPosition.

GetScrollState () const

uint8_t 

Obtains the scroll state of this list.

operator new (size_t size)

void * 

Overrides the new function.

operator delete (void *p)

void 

Overrides the delete function.