Class MEikScrollBarObserver

MEikScrollBarObserver

Support

Supported from 6.0

Description

This mixin is implemented by classes wishing to receive notification about scroll events from a scroll bar. Each scroll bar has a scroll bar observer registered with it in its construction, and will call the HandleScrollEventL() of its observer when the user moves the scroll bar.

Scroll bar observers are not owned by their scroll bar, and must be deleted explicitly. It is possible to register the same scroll bar observer with many scroll bars. This class is intended for derivation by all classes interested in scroll events from CEikScrollBars.

Defined in MEikScrollBarObserver:
EEikScrollBottom, EEikScrollDown, EEikScrollEnd, EEikScrollHome, EEikScrollLeft, EEikScrollPageDown, EEikScrollPageLeft, EEikScrollPageRight, EEikScrollPageUp, EEikScrollRight, EEikScrollThumbDragHoriz, EEikScrollThumbDragVert, EEikScrollThumbReleaseHoriz, EEikScrollThumbReleaseVert, EEikScrollTop, EEikScrollUp, HandleScrollEventL(), TEikScrollEvent

See also:

• CEikScrollBar::ConstructL()
• TEikScrollEvent

virtual void HandleScrollEventL
    (CEikScrollBar* aScrollBar,
     TEikScrollEvent aEventType)=0;

Description

Handles scroll events. This function is called by the CEikScrollBar object with which this scroll bar observer object is registered. Implementations should handle scroll events appropriately.

Parameters

CEikScrollBar* aScrollBar Pointer to the originating scroll bar object. TEikScrollEvent aEventType A scroll event.

TEikScrollEvent

Description

Communicates types of user interaction with scrollbars. To receive notification of scroll bar events, classes must implement the mixin MEikScrollBarObserver. Each scroll bar has a scroll bar observer registered with it in its construction, and will call the HandleScrollEventL() of its observer when the user moves the scroll bar.

EEikScrollLeft User scrolled leftwards. EEikScrollUp User scrolled upwards. EEikScrollRight User scrolled rightwards. EEikScrollDown User scrolled downwards. EEikScrollPageLeft User scrolled leftwards by a page. EEikScrollPageUp User scrolled upwards by a page. EEikScrollPageRight User scrolled rightwards by a page. EEikScrollPageDown User scrolled downwards by a page EEikScrollHome User scrolled to the maximum extent leftwards. EEikScrollTop User scrolled to the maximum extent upwards. EEikScrollEnd User scrolled to the maximum extent rightwards. EEikScrollBottom User scrolled to the maximum extent downwards. EEikScrollThumbDragHoriz User dragged the thumb horizontally. EEikScrollThumbDragVert User dragged the scroll thumb vertically. EEikScrollThumbReleaseHoriz User released the scroll thumb on a horizontal scroll bar. EEikScrollThumbReleaseVert User released the scroll thumb on a vertical scroll bar.